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GE C70 Instruction Manual

Capacitor bank protection and control system
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GE
Digital Energy
GE Digital Energy
650 Markland Street
Markham, Ontario
Canada L6C 0M1
Tel: +1 905 927 7070 Fax: +1 905 927 5098
Internet:
http://www.GEDigitalEnergy.com
*1601-9015-Z2*
C70 Capacitor Bank Protection
and Control System
UR Series Instruction Manual
Manual P/N: 1601-9015-Z2 (GEK-119513A)
IND.CONT. EQ.
C70 Revision: 7.1x
E83849
LISTED
52TL
834766A1.CDR
GE Multilin's Quality Management
System is registered to ISO
9001:2008
QMI # 005094
UL # A3775

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  • Page 1 Digital Energy C70 Capacitor Bank Protection and Control System UR Series Instruction Manual C70 Revision: 7.1x Manual P/N: 1601-9015-Z2 (GEK-119513A) 834766A1.CDR E83849 GE Digital Energy LISTED 650 Markland Street IND.CONT. EQ. 52TL Markham, Ontario GE Multilin's Quality Management Canada L6C 0M1...
  • Page 2 The contents of this manual are the property of GE Multilin Inc. This documentation is furnished on license and may not be reproduced in whole or in part without the permission of GE Multilin. The content of this manual is for informational use only and is subject to change without notice.
  • Page 3: Table Of Contents

    1.3 ENERVISTA UR SETUP SOFTWARE 1.3.1 PC REQUIREMENTS ..................1-6 1.3.2 INSTALLATION....................1-6 1.3.3 CONFIGURING THE C70 FOR SOFTWARE ACCESS ........1-7 1.3.4 USING THE QUICK CONNECT FEATURE............. 1-10 1.3.5 CONNECTING TO THE C70 RELAY .............. 1-15 1.3.6 SETTING UP CYBERSENTRY AND CHANGING DEFAULT PASSWORD ... 1-16 1.4 UR HARDWARE...
  • Page 4 USER-DEFINABLE DISPLAYS ................5-78 5.2.16 DIRECT INPUTS AND OUTPUTS..............5-80 5.2.17 INSTALLATION ....................5-88 5.3 REMOTE RESOURCES 5.3.1 REMOTE RESOURCES CONFIGURATION............5-89 5.4 SYSTEM SETUP 5.4.1 AC INPUTS.......................5-90 5.4.2 POWER SYSTEM ....................5-91 5.4.3 SIGNAL SOURCES ..................5-93 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 5 6. ACTUAL VALUES 6.1 OVERVIEW 6.1.1 ACTUAL VALUES MENU .................. 6-1 6.2 STATUS 6.2.1 CONTACT INPUTS.................... 6-3 6.2.2 VIRTUAL INPUTS....................6-3 6.2.3 REMOTE INPUTS....................6-3 6.2.4 REMOTE DOUBLE-POINT STATUS INPUTS ..........6-4 GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 6 PHASE CURRENT UNBALANCE (ANSI 60P) ..........8-10 8.1.6 NEUTRAL CURRENT UNBALANCE (ANSI 60N) ..........8-12 9. APPLICATION OF 9.1 ARRANGEMENT OF SHUNT CAPACITOR BANKS SETTINGS 9.1.1 OVERVIEW ......................9-1 9.1.2 EXTERNALLY FUSED CAPACITORS ...............9-1 9.1.3 INTERNALLY FUSED CAPACITORS ..............9-1 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 7 B.2.6 EXCEPTION RESPONSES ................B-5 B.3 FILE TRANSFERS B.3.1 OBTAINING RELAY FILES VIA MODBUS ............B-6 B.3.2 MODBUS PASSWORD OPERATION ...............B-7 B.4 MEMORY MAPPING B.4.1 MODBUS MEMORY MAP .................B-8 B.4.2 DATA FORMATS .....................B-69 GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 8 DNP V3.00 DEVICE PROFILE ................E-1 E.1.2 IMPLEMENTATION TABLE ................E-4 E.2 DNP POINT LISTS E.2.1 BINARY INPUT POINTS ................... E-8 E.2.2 BINARY AND CONTROL RELAY OUTPUT............E-9 E.2.3 COUNTERS..................... E-10 E.2.4 ANALOG INPUTS.................... E-11 viii C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 9 G. MISCELLANEOUS G.1 CHANGE NOTES G.1.1 REVISION HISTORY ..................G-1 G.1.2 CHANGES TO THE C70 MANUAL..............G-1 G.2 ABBREVIATIONS G.2.1 STANDARD ABBREVIATIONS ................ G-4 G.3 WARRANTY G.3.1 GE MULTILIN WARRANTY ................G-6 GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 10 TABLE OF CONTENTS C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 11: Getting Started

    1.1 IMPORTANT PROCEDURES 1 GETTING STARTED 1.1IMPORTANT PROCEDURES Use this chapter for initial setup of your new C70 Capacitor Bank Protection and Control System. 1.1.1 CAUTIONS AND WARNINGS Before attempting to install or use the device, review all safety indicators in this document to help prevent injury, equipment damage, or downtime.
  • Page 12: Inspection Procedure

    • GE EnerVista™ CD (includes the EnerVista UR Setup software and manuals in PDF format) • Mounting screws If there is any noticeable physical damage, or any of the contents listed are missing, please contact GE Digital Energy immediately as follows.
  • Page 13: Ur Overview

    1.2UR OVERVIEW 1.2.1 INTRODUCTION TO THE UR The GE Universal Relay (UR) series is a new generation of digital, modular, and multifunction equipment that is easily incorporated into automation systems, at both the station and enterprise levels. 1.2.2 HARDWARE ARCHITECTURE...
  • Page 14 (FlexLogic equation), and then sets each output to the appropriate state in an output status table. Any result- ing task execution is priority interrupt-driven. Figure 1–3: UR-SERIES SCAN OPERATION C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 15: Software Architecture

    Employing OOD/OOP in the software architecture of the C70 achieves the same features as the hardware architecture: modularity, scalability, and flexibility. The application software for any UR-series device (for example, feeder protection, transformer protection, distance protection) is constructed by combining objects from the various functional classes.
  • Page 16: Enervista Ur Setup Software

    500 MB free hard drive space (1 GB recommended) • 1024 x 768 display (1280 x 800 recommended) The following qualified modems have been tested to be compliant with the C70 and the EnerVista UR Setup software: • US Robotics external 56K FaxModem 5686 •...
  • Page 17: Configuring The C70 For Software Access

    An Ethernet module must be specified at the time of ordering. • To configure the C70 for local access with a laptop through either the front RS232 port or rear Ethernet port, see the Using the Quick Connect Feature section.
  • Page 18 SERIAL PORTS 10. Click the Read Order Code button to connect to the C70 device and upload the order code. If a communications error occurs, ensure that the EnerVista UR Setup serial communications values entered in the previous step correspond to the relay setting values.
  • Page 19 MODBUS PROTOCOL 21. Click the Read Order Code button to connect to the C70 device and upload the order code. If an communications error occurs, ensure that the three EnerVista UR Setup values entered in the previous steps correspond to the relay setting values.
  • Page 20: Using The Quick Connect Feature

    USING QUICK CONNECT VIA THE REAR ETHERNET PORTS To use the Quick Connect feature to access the C70 from a computer through Ethernet, first assign an IP address to the relay from the front panel keyboard. Press the MENU key until the SETTINGS menu displays.
  • Page 21 Right-click the Local Area Connection icon and select Properties. Select the Internet Protocol (TCP/IP) item from the list, and click the Properties button. Click the “Use the following IP address” box. GE Multilin C70 Capacitor Bank Protection and Control System 1-11...
  • Page 22 1.3 ENERVISTA UR SETUP SOFTWARE 1 GETTING STARTED Enter an IP address with the first three numbers the same as the IP address of the C70 relay and the last number dif- ferent (in this example, 1.1.1.2). Enter a subnet mask equal to the one set in the C70 (in this example, 255.0.0.0).
  • Page 23 If this computer is used to connect to the Internet, re-enable any proxy server settings after the laptop has been discon- nected from the C70 relay. Start the Internet Explorer software. Select the “UR” device from the EnerVista Launchpad to start EnerVista UR Setup. GE Multilin C70 Capacitor Bank Protection and Control System 1-13...
  • Page 24 Click the Quick Connect button to open the Quick Connect dialog box. Select the Ethernet interface and enter the IP address assigned to the C70, then click the Connect button. The EnerVista UR Setup software creates a site named “Quick Connect” with a corresponding device also named “Quick Connect”...
  • Page 25: Connecting To The C70 Relay

    The EnerVista UR Setup software has several quick action buttons to provide instant access to several functions that are often performed when using C70 relays. From the online window, users can select the relay to interrogate from a pull-down window, then click the button for the action they want to perform. The following quick action functions are available: •...
  • Page 26: Setting Up Cybersentry And Changing Default Password

    . Be sure to disable this bypass setting after SETTINGS > PRODUCT SETUP > SECURITY > SUPERVISORY commissioning the device. You can change the password for any role either from the front panel or through EnerVista. 1-16 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 27 It is strongly recommended that the password for the Administrator be changed from the default. Changing the passwords for the other three roles is optional. Figure 1–11: CHANGING THE DEFAULT PASSWORD GE Multilin C70 Capacitor Bank Protection and Control System 1-17...
  • Page 28: Ur Hardware

    This device (catalog number F485) connects to the computer using a straight-through serial cable. A shielded twisted-pair (20, 22, or 24 AWG) connects the F485 converter to the C70 rear communications port. The converter terminals (+, –, GND) are connected to the C70 communication module (+, –, COM) terminals. See the CPU communica- tions ports section in chapter 3 for details.
  • Page 29: Using The Relay

    MESSAGE LEFT key from a setting value or actual value display returns to the header display. HIGHEST LEVEL LOWEST LEVEL (SETTING VALUE)  SETTINGS  PASSWORD ACCESS LEVEL:  PRODUCT SETUP  SECURITY Restricted  SETTINGS  SYSTEM SETUP GE Multilin C70 Capacitor Bank Protection and Control System 1-19...
  • Page 30: Relay Activation

    For more information, see the CyberSentry content in the Security section of the next chapter. 1.5.6 FLEXLOGIC CUSTOMIZATION FlexLogic equation editing is required for setting user-defined logic for customizing the relay operations. See the FlexLogic section in Chapter 5. 1-20 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 31: Commissioning

    As such, no further functional tests are required. The C70 performs a number of continual self-tests and takes the necessary action in case of any major errors (see the Relay Self-tests section in chapter 7). However, it is recommended that C70 maintenance be scheduled with other system maintenance.
  • Page 32 1.5 USING THE RELAY 1 GETTING STARTED 1-22 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 33: Product Description

    PTP (according to IEEE Std. 1588-2008 or IEC 61588), and allows access to the relay via any standard web browser (C70 web pages). The IEC 60870-5-104 protocol is supported on the Ethernet port, and DNP 3.0 and IEC 60870-5-104 cannot be enabled at the same time.
  • Page 34 Contact inputs (up to 96) Frequency metering User-programmable fault reports Contact outputs (up to 64) IEC 61850 communications (optional) User-programmable LEDs Control pushbuttons Modbus communications User-programmable pushbuttons CyberSentry™ security Modbus user map User-programmable self-tests C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 35: Security

    Changing the date and time • Clearing the data logger • Clearing the user-programmable pushbutton states The following operations are under setting password supervision: • Changing any setting • Test mode operation GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 36 When entering a settings or command password via EnerVista or any serial interface, the user must enter the correspond- ing connection password. If the connection is to the back of the C70, the remote password must be used. If the connection is to the RS232 port of the faceplate, the local password applies.
  • Page 37 |--------------- Modbus user map |--------------- Real Time Clock |--------------- Oscillography |--------------- Data Logger |--------------- Demand User Programmable |--------------- LEDs User Programmable |--------------- self test |--------------- Control Pushbuttons User programmable |--------------- Pushbuttons |--------------- Flex states GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 38 Commands |------------ Virtual Inputs |------------ Clear Records |------------ Set date and time User Displays Targets Actual Values |------------ Front Panel Labels Designer |------------ Status |------------ Metereing |------------ Transducer I/O |------------ Records C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 39: Ordering

    OVERVIEW The C70 is available as a 19-inch rack horizontal mount and consists of the following modules: power supply, CPU, CT/VT, digital input and output, transducer input and output, and inter-relay communications. Each of these modules can be sup- plied in a number of configurations specified at the time of ordering.
  • Page 40 G.703, 2 Channels RS422, 2 Channels The order codes for the reduced size vertical mount units are shown below. Table 2–5: C70 ORDER CODES (REDUCED SIZE VERTICAL UNITS) * - F Reduced Size Vertical Mount (see note regarding P/R slot below)
  • Page 41 2 PRODUCT DESCRIPTION 2.1 INTRODUCTION Table 2–5: C70 ORDER CODES (REDUCED SIZE VERTICAL UNITS) MOUNT/COATING Vertical (3/4 rack) Vertical (3/4 rack) with harsh-environment coating FACEPLATE/ DISPLAY English display French display Russian display Chinese display Enhanced front panel with English display...
  • Page 42 2 PRODUCT DESCRIPTION c) ORDER CODES WITH PROCESS BUS MODULES The order codes for the horizontal mount units with the process bus module are shown below. Table 2–6: C70 ORDER CODES (HORIZONTAL UNITS WITH PROCESS BUS MODULE) * - F - W/X...
  • Page 43 2.1 INTRODUCTION The order codes for the reduced size vertical mount units with the process bus module are shown below. Table 2–7: C70 ORDER CODES (REDUCED SIZE VERTICAL UNITS WITH PROCESS BUS MODULE) * - F Reduced Size Vertical Mount (see note regarding P/R slot below)
  • Page 44: Replacement Modules

    Replacement modules can be ordered separately. When ordering a replacement CPU module or faceplate, provide the serial number of your existing unit. Not all replacement modules may be applicable to the C70 relay. Only the modules specified in the order codes are available as replacement modules.
  • Page 45 Channel 1 - RS422; Channel 2 - 1300 nm, single-mode, LASER Channel 1 - G.703; Channel 2 - 1300 nm, single-mode LASER G.703, 1 Channel G.703, 2 Channels RS422, 1 Channel RS422, 2 Channels GE Multilin C70 Capacitor Bank Protection and Control System 2-13...
  • Page 46: Specifications

    Open delay: 0 to 65.353 s in steps of 0.001 Timer accuracy: ±3% of operate time or ±20 ms, which- ever is greater Operate time: <80 ms at 60 Hz 2-14 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 47 Pickup delay: 0 to 600.00 s in steps of 0.01 Timer accuracy: ±3% of operate time or ±35 ms, which- ever is greater Operate time: <35 ms at 60 Hz GE Multilin C70 Capacitor Bank Protection and Control System 2-15...
  • Page 48 0 to 600.00 s in steps of 0.01 Timer accuracy: ±3% of operate time or ±20 ms, which- ever is greater <30 ms at 1.10  pickup at 60 Hz Operate time: 2-16 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 49: User-Programmable Elements

    Number: up to 256 logical variables grouped tual input under 16 Modbus addresses Reset mode: self-reset or latched Programmability: any logical variable, contact, or virtual input GE Multilin C70 Capacitor Bank Protection and Control System 2-17...
  • Page 50: Monitoring

    ±0.5% of reading from 10 to 208 V 0.1 to 2.0  CT rating: ±0.25% of reading or ±0.1% of rated (whichever is greater) 2.0  CT rating: ±1.0% of reading 2-18 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 51: Inputs

    Debounce time: 0.0 to 16.0 ms in steps of 0.5 Continuous current draw:3 mA (when energized) Auto-burnish impulse current: 50 to 70 mA Duration of auto-burnish impulse: 25 to 50 ms GE Multilin C70 Capacitor Bank Protection and Control System 2-19...
  • Page 52: Power Supply

    Control: separate operate and reset inputs Control mode: operate-dominant or reset-dominant FORM-A VOLTAGE MONITOR Applicable voltage: approx. 15 to 250 V DC Trickle current: approx. 1 to 2.5 mA 2-20 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 53 99% Settling time to a step change: 100 ms Isolation: 1.5 kV Driving signal: any FlexAnalog quantity Upper and lower limit for the driving signal: –90 to 90 pu in steps of 0.001 GE Multilin C70 Capacitor Bank Protection and Control System 2-21...
  • Page 54: Communications

    –30 dBm 29 dB Singlemode 1550 nm Laser, +5 dBm –30 dBm 35 dB Singlemode These power budgets are calculated from the manu- facturer’s worst-case transmitter power and worst NOTE 2-22 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 55: Environmental

    – Overvoltage category: 20°C Ingress protection: IP20 front, IP10 back HUMIDITY Humidity: operating up to 95% (non-condensing) at 55°C (as per IEC60068-2-30 variant 1, 6 days). GE Multilin C70 Capacitor Bank Protection and Control System 2-23...
  • Page 56: Type Tests

    NKCR Safety UL C22.2-14 e83849 NKCR7 Safety UL1053 e83849 NKCR 2.2.12 PRODUCTION TESTS THERMAL Products go through an environmental test based upon an Accepted Quality Level (AQL) sampling process. 2-24 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 57: Approvals

    To avoid deterioration of electrolytic capacitors, power up units that are stored in a de-energized state once per year, for one hour continuously. GE Multilin C70 Capacitor Bank Protection and Control System 2-25...
  • Page 58 2.2 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2-26 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 59: Hardware

    HORIZONTAL UNITS The C70 Capacitor Bank Protection and Control System is available as a 19-inch rack horizontal mount unit with a remov- able faceplate. The faceplate can be specified as either standard or enhanced at the time of ordering. The enhanced face- plate contains additional user-programmable pushbuttons and LED indicators.
  • Page 60 VERTICAL UNITS The C70 Capacitor Bank Protection and Control System is available as a reduced size (¾) vertical mount unit, with a removable faceplate. The faceplate can be specified as either standard or enhanced at the time of ordering. The enhanced faceplate contains additional user-programmable pushbuttons and LED indicators.
  • Page 61 RS232 communications port. The relay is secured to the panel with the use of four screws supplied with the relay. 11.015” 7.482” 1.329” 13.560” 15.000” 14.025” 4.000” 9.780” 843809A1.CDR Figure 3–4: C70 VERTICAL DIMENSIONS (ENHANCED PANEL) GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 62 3.1 DESCRIPTION 3 HARDWARE Figure 3–5: C70 VERTICAL MOUNTING AND DIMENSIONS (STANDARD PANEL) For details on side mounting C70 devices with the enhanced front panel, refer to the following documents available online from the GE Multilin website. • GEK-113180: UR-series UR-V side-mounting front panel assembly instructions.
  • Page 63 3 HARDWARE 3.1 DESCRIPTION Figure 3–6: C70 VERTICAL SIDE MOUNTING INSTALLATION (STANDARD PANEL) GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 64 3.1 DESCRIPTION 3 HARDWARE Figure 3–7: C70 VERTICAL SIDE MOUNTING REAR DIMENSIONS (STANDARD PANEL) C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 65: Rear Terminal Layout

    (nearest to CPU module) which is indicated by an arrow marker on the terminal block. See the following figure for an example of rear terminal assignments. Figure 3–9: EXAMPLE OF MODULES IN F AND H SLOTS GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 66: Wiring

    3.2 WIRING 3 HARDWARE 3.2WIRING 3.2.1 TYPICAL WIRING Figure 3–10: TYPICAL WIRING DIAGRAM (T MODULE SHOWN FOR CPU) C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 67: Dielectric Strength

    (see the Self-test errors section in chapter 7) or control power is lost, the relay is de-energize. For high reliability systems, the C70 has a redundant option in which two C70 power supplies are placed in parallel on the bus.
  • Page 68: Ct/Vt Modules

    CT connections for both ABC and ACB phase rotations are identical as shown in the Typical wiring diagram. The exact placement of a zero-sequence core balance CT to detect ground fault current is shown below. Twisted-pair cabling on the zero-sequence CT is recommended. 3-10 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 69 8F, 8G, 8L, and 8M modules (4 CTs and 4 VTs) Current inputs 8H, 8J, 8N, and 8R modules (8 CTs) Voltage inputs 8V modules (8 VTs) 842809A1.CDR Figure 3–13: CT/VT MODULE WIRING GE Multilin C70 Capacitor Bank Protection and Control System 3-11...
  • Page 70: Process Bus Modules

    3.2.5 PROCESS BUS MODULES The C70 can be ordered with a process bus interface module. This module is designed to interface with the GE Multilin HardFiber system, allowing bidirectional IEC 61850 fiber optic communications with up to eight HardFiber merging units, known as Bricks.
  • Page 71 Logic operand driving the contact output should be given a reset delay of 10 ms to prevent damage of the output contact (in situations when the element initiating the contact output is bouncing, at val- ues in the region of the pickup value). GE Multilin C70 Capacitor Bank Protection and Control System 3-13...
  • Page 72 2 Inputs ~7a, ~7c 2 Inputs ~7a, ~7c 2 Inputs ~7a, ~7c 2 Inputs ~8a, ~8c 2 Inputs ~8a, ~8c 2 Inputs ~8a, ~8c 2 Inputs ~8a, ~8c 2 Inputs 3-14 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 73 2 Inputs 2 Outputs Solid-State Solid-State ~6a, ~6c 2 Inputs 2 Outputs Not Used Not Used ~7a, ~7c 2 Inputs 2 Outputs Solid-State Solid-State ~8a, ~8c 2 Inputs Not Used GE Multilin C70 Capacitor Bank Protection and Control System 3-15...
  • Page 74 3.2 WIRING 3 HARDWARE Figure 3–15: CONTACT INPUT AND OUTPUT MODULE WIRING (1 of 2) 3-16 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 75 COMMON SURGE 842763A2.CDR Figure 3–16: CONTACT INPUT AND OUTPUT MODULE WIRING (2 of 2) For proper functionality, observe correct polarity for all contact input and solid state output connec- tions. GE Multilin C70 Capacitor Bank Protection and Control System 3-17...
  • Page 76 There is no provision in the relay to detect a DC ground fault on 48 V DC control power external output. We recom- mend using an external DC supply. NOTE 3-18 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 77 = ON 842751A1.CDR Figure 3–19: AUTO-BURNISH DIP SWITCHES The auto-burnish circuitry has an internal fuse for safety purposes. During regular maintenance, check the auto- burnish functionality using an oscilloscope. NOTE GE Multilin C70 Capacitor Bank Protection and Control System 3-19...
  • Page 78: Transducer Inputs/Outputs

    (5A, 5C, 5D, 5E, and 5F) and channel arrangements that can be ordered for the relay. Wherever a tilde “~” symbol appears, substitute with the slot position of the module. NOTE Figure 3–20: TRANSDUCER INPUT/OUTPUT MODULE WIRING 3-20 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 79: Rs232 Faceplate Port

    3.2.8 RS232 FACEPLATE PORT A 9-pin RS232C serial port is located on the C70 faceplate for programming with a computer. All that is required to use this interface is a computer running the EnerVista UR Setup software provided with the relay. Cabling for the RS232 port is shown in the following figure for both 9-pin and 25-pin connectors.
  • Page 80 This common voltage is implied to be a power supply common. Some systems allow the shield (drain wire) to be used as common wire and to connect directly to the C70 COM terminal (#3); others function cor- rectly only if the common wire is connected to the C70 COM terminal, but insulated from the shield.
  • Page 81 62.5 µm for 100 Mbps. For optical power budgeting, splices are required every 1 km for the transmitter/receiver pair. When splicing optical fibers, the diameter and numerical aperture of each fiber must be the same. GE Multilin C70 Capacitor Bank Protection and Control System 3-23...
  • Page 82: Irig-B

    Figure 3–24: OPTIONS FOR THE IRIG-B CONNECTION Using an amplitude modulated receiver causes errors up to 1 ms in event time-stamping. NOTE 3-24 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 83: Direct Input/Output Communications

    3.3DIRECT INPUT/OUTPUT COMMUNICATIONS 3.3.1 DESCRIPTION The C70 direct inputs and outputs feature makes use of the type 7 series of communications modules, which allow direct messaging between devices. The communications channels are normally connected in a ring configuration as shown in the following figure. The trans- mitter of one module is connected to the receiver of the next module.
  • Page 84 These modules are listed in the following table. All fiber modules use ST type connectors. Not all the direct input and output communications modules may be applicable to the C70 relay. Only the modules specified in the order codes are available as direct input and output communications modules.
  • Page 85: Fiber: Led And Eled Transmitters

    3.3.2 FIBER: LED AND ELED TRANSMITTERS The following figure shows the configuration for the 7A, 7B, 7C, 7H, 7I, and 7J fiber-only modules. Figure 3–28: LED AND ELED FIBER MODULES GE Multilin C70 Capacitor Bank Protection and Control System 3-27...
  • Page 86: Interface

    Remove the top cover by sliding it towards the rear and then lift it upwards. Set the timing selection switches (channel 1, channel 2) to the desired timing modes. Replace the top cover and the cover screw. 3-28 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 87 For connection to a higher order system (UR- to-multiplexer, factory defaults), set to octet timing (S1 = ON) and set timing mode to loop timing (S5 = OFF and S6 = OFF). GE Multilin C70 Capacitor Bank Protection and Control System 3-29...
  • Page 88 G.703 line side of the interface while the other lies on the differential Manchester side of the interface. DMR = Differential Manchester Receiver DMX = Differential Manchester Transmitter G7X = G.703 Transmitter G7R = G.703 Receiver 842775A1.CDR Figure 3–33: G.703 DUAL LOOPBACK MODE 3-30 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 89: Rs422 Interface

    If the terminal timing feature is not available or this type of connection is not desired, the G.703 interface is a viable option that does not impose timing restrictions. GE Multilin C70 Capacitor Bank Protection and Control System 3-31...
  • Page 90 Figure 3–36: TIMING CONFIGURATION FOR RS422 TWO-CHANNEL, THREE-TERMINAL APPLICATION Data module 1 provides timing to the C70 RS422 interface via the ST(A) and ST(B) outputs. Data module 1 also provides timing to data module 2 TT(A) and TT(B) inputs via the ST(A) and AT(B) outputs. The data module pin numbers have been omitted in the figure above since they vary by manufacturer.
  • Page 91: Ieee C37.94 Interface

    The UR-series C37.94 communication module can be connected to the electrical interface (G.703, RS422, or X.21) of a non-compliant digital multiplexer via an optical-to-electrical interface converter that supports the IEEE C37.94 standard, as shown below. GE Multilin C70 Capacitor Bank Protection and Control System 3-33...
  • Page 92 Once the clips have cleared the raised edge of the chassis, engage the clips simultaneously. When the clips have locked into position, the module is fully inserted. 3-34 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 93 3 HARDWARE 3.3 DIRECT INPUT/OUTPUT COMMUNICATIONS Figure 3–38: IEEE C37.94 TIMING SELECTION SWITCH SETTING GE Multilin C70 Capacitor Bank Protection and Control System 3-35...
  • Page 94 Solid yellow — FPGA is receiving a "yellow bit" and remains yellow for each "yellow bit" • Solid red — FPGA is not receiving a valid packet or the packet received is invalid 3-36 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 95: Human Interfaces

    In online mode, you can communicate with the device in real-time. The EnerVista UR Setup software is provided with every C70 relay and runs on Microsoft Windows XP, 7, and Server 2008. This chapter provides a summary of the basic EnerVista UR Setup software interface features. The EnerVista UR Setup Help File provides details for getting started and using the EnerVista UR Setup software interface.
  • Page 96 Site List window are automatically sent to the online communicating device. g) FIRMWARE UPGRADES The firmware of a C70 device can be upgraded, locally or remotely, via the EnerVista UR Setup software. The correspond- ing instructions are provided by the EnerVista UR Setup Help file under the topic “Upgrading Firmware”.
  • Page 97: Enervista Ur Setup Main Window

    Settings file data view windows, with common tool bar Workspace area with data view tabs Status bar 10. Quick action hot links 842786A2.CDR Figure 4–1: ENERVISTA UR SETUP SOFTWARE MAIN WINDOW GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 98: Extended Enervista Ur Setup Features

    Select the Template Mode > Edit Template option to place the device in template editing mode. Enter the template password then click OK. Open the relevant settings windows that contain settings to be specified as viewable. C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 99 The following procedure describes how to add password protection to a settings file template. Select a settings file from the offline window on the left of the EnerVista UR Setup main screen. Selecting the Template Mode > Password Protect Template option. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 100 The template specifies that only the Pickup Curve Phase time overcurrent settings window without template applied. settings be available. 842858A1.CDR Figure 4–4: APPLYING TEMPLATES VIA THE VIEW IN TEMPLATE MODE COMMAND C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 101 Select an installed device or settings file from the tree menu on the left of the EnerVista UR Setup main screen. Select the Template Mode > Remove Settings Template option. Enter the template password and click OK to continue. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 102: Securing And Locking Flexlogic Equations

    Click on Save to save and apply changes to the settings template. Select the Template Mode > View In Template Mode option to view the template. Apply a password to the template then click OK to secure the FlexLogic equation. C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 103 FlexLogic entries in a settings file have been secured, use the following procedure to lock the settings file to a specific serial number. Select the settings file in the offline window. Right-click on the file and select the Edit Settings File Properties item. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 104: Settings File Traceability

    When a settings file is transferred to a C70 device, the date, time, and serial number of the C70 are sent back to EnerVista UR Setup and added to the settings file on the local PC. This infor- mation can be compared with the C70 actual values at any later date to determine if security has been compromised.
  • Page 105 4.2 EXTENDED ENERVISTA UR SETUP FEATURES The transfer date of a setting file written to a C70 is logged in the relay and can be viewed via EnerVista UR Setup or the front panel display. Likewise, the transfer date of a setting file saved to a local PC is logged in EnerVista UR Setup.
  • Page 106 ONLINE DEVICE TRACEABILITY INFORMATION The C70 serial number and file transfer date are available for an online device through the actual values. Select the Actual Values > Product Info > Model Information menu item within the EnerVista UR Setup online window as shown in the example below.
  • Page 107: Faceplate Interface

    LED panel 3 Display Front panel RS232 port Small user-programmable User-programmable Keypad (control) pushbuttons 1 to 7 pushbuttons 1 to 12 827801A . Figure 4–16: UR-SERIES STANDARD HORIZONTAL FACEPLATE PANELS GE Multilin C70 Capacitor Bank Protection and Control System 4-13...
  • Page 108: Led Indicators

    The status indicators in the first column are described below. • IN SERVICE: This LED indicates that control power is applied, all monitored inputs, outputs, and internal systems are OK, and that the device has been programmed. 4-14 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 109 Support for applying a customized label beside every LED is provided. Default labels are shipped in the label pack- age of every C70, together with custom templates. The default labels can be replaced by user-printed labels. User customization of LED operation is of maximum benefit in installations where languages other than English are used to communicate with operators.
  • Page 110 LEDs on these panels. USER-PROGRAMMABLE LEDS USER-PROGRAMMABLE LEDS 842782A1.CDR Figure 4–20: LED PANELS 2 AND 3 (INDEX TEMPLATE) DEFAULT LABELS FOR LED PANEL 2: The default labels are intended to represent: 4-16 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 111: Custom Labeling Of Leds

    EnerVista UR Setup software is installed and operational • The C70 settings have been saved to a settings file • The C70 front panel label cutout sheet (GE Multilin part number 1006-0047) has been downloaded from http://www.gedigitalenergy.com/products/support/ur/URLEDenhanced.doc and printed •...
  • Page 112 Enter the text to appear next to each LED and above each user-programmable pushbuttons in the fields provided. Feed the C70 front panel label cutout sheet into a printer and press the Print button in the front panel report window.
  • Page 113 Slide the label tool under the LED label until the tabs snap out as shown below. This attaches the label tool to the LED label. Remove the tool and attached LED label as shown below. GE Multilin C70 Capacitor Bank Protection and Control System 4-19...
  • Page 114 Slide the new LED label inside the pocket until the text is properly aligned with the LEDs, as shown below. The following procedure describes how to remove the user-programmable pushbutton labels from the C70 enhanced front panel and insert the custom labels.
  • Page 115 The panel templates provide relative LED locations and located example text (x) edit boxes. The following procedure demonstrates how to install/uninstall the custom panel labeling. GE Multilin C70 Capacitor Bank Protection and Control System 4-21...
  • Page 116: Display

    Microsoft Word 97 or later software for editing the template • 1 each of: 8.5" x 11" white paper, exacto knife, ruler, custom display module (GE Multilin Part Number: 1516-0069), and a custom module cover (GE Multilin Part Number: 1502-0015) The following procedure describes how to customize the C70 display module: Open the LED panel customization template with Microsoft Word.
  • Page 117: Keypad

    INTRODUCTION The C70 can interface with associated circuit breakers. In many cases the application monitors the state of the breaker, that can be presented on faceplate LEDs, along with a breaker trouble indication. Breaker operations can be manually initiated from faceplate keypad or automatically initiated from a FlexLogic operand.
  • Page 118: Menus

    Each press of the MENU key advances through the following main heading pages: • Actual values • Settings • Commands • Targets • User displays (when enabled) 4-24 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 119 TIME: 1.0 s  To view the remaining settings associated with the Display Properties subheader, DEFAULT MESSAGE repeatedly press the MESSAGE DOWN key. The last message appears as shown. INTENSITY: 25% GE Multilin C70 Capacitor Bank Protection and Control System 4-25...
  • Page 120: Changing Settings

    Text settings have data values which are fixed in length, but user-defined in character. They can be upper case letters, lower case letters, numerals, and a selection of special characters. 4-26 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 121: Settings

    The information in this section refers to password security. For information on how to set or change CyberSentry pass- words, see the Settings > Product Setup > Security > CyberSentry section in the next chapter. GE Multilin C70 Capacitor Bank Protection and Control System 4-27...
  • Page 122 When an incorrect command or setting password has been entered via the faceplate interface three times within a 3-minute time span, the FlexLogic operand is set to “On” and the C70 does not allow settings or command LOCAL ACCESS DENIED...
  • Page 123 FlexLogic operand is set to “On” and the REMOTE ACCESS DENIED C70 does not allow Settings or Command access via the any external communications interface for the next ten minutes. FlexLogic operand is set to “Off” after the expiration of the ten-minute timeout.
  • Page 124 4.3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4-30 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 125: Overview

     SETTINGS  AC INPUTS See page 5-90.  SYSTEM SETUP   POWER SYSTEM See page 5-91.   SIGNAL SOURCES See page 5-93.   BREAKERS See page 5-96.  GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 126 See page 5-219.   MONITORING See page 5-221.  ELEMENTS  SETTINGS  CONTACT INPUTS See page 5-233.  INPUTS / OUTPUTS   VIRTUAL INPUTS See page 5-235.  C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 127 TEST MODE See page 5-254.  TESTING FUNCTION: Disabled TEST MODE FORCING: See page 5-254.  FORCE CONTACT See page 5-255.  INPUTS  FORCE CONTACT See page 5-256.  OUTPUTS GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 128: Introduction To Elements

    RESET DELAY setting: This setting is used to set a time-delay-on-dropout, or off-delay, for the duration between the Operate output state and the return to logic 0 after the input transits outside the defined pickup range. C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 129: Introduction To Ac Sources

    BACKGROUND The C70 may be used on systems with breaker-and-a-half or ring bus configurations. In these applications, each of the two three-phase sets of individual phase currents (one associated with each breaker) can be used as an input to a breaker fail- ure element.
  • Page 130 CT/VT MODULE 1 CT/VT MODULE 2 CT/VT MODULE 3 < bank 1 > < bank 3 > < bank 5 > < bank 2 > < bank 4 > < bank 6 > C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 131 CTs on each of two breakers is required to measure the winding current flow. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 132: Product Setup

    If all passwords are lost, recovery is possible by resetting the unit to default values. To reset the unit after a lost password: Email GE customer service at multilin.tech@ge.com with the serial number and using a recognizable corporate email account. Customer service provides a code to reset the relay to the factory defaults.
  • Page 133 When entering a settings or command password via EnerVista or any serial interface, the user must enter the correspond- ing connection password. If the connection is to the back of the C70, the remote password must be used. If the connection is to the RS232 port of the faceplate, the local password must be used.
  • Page 134 INVALID ATTEMPTS BEFORE LOCKOUT The C70 provides a means to raise an alarm upon failed password entry. Should password verification fail while accessing a password-protected level of the relay (either settings or commands), the FlexLogic operand is UNAUTHORIZED ACCESS asserted.
  • Page 135 If access is permitted and an off-to-on transition of the FlexLogic operand is detected, the timeout is restarted. The status of this timer is updated every 5 seconds. GE Multilin C70 Capacitor Bank Protection and Control System 5-11...
  • Page 136 It is disabled by default to allow the administrator direct access to the EnerVista software immediately after installation. When security is disabled, all users have administrator access. GE recommends enabling the EnerVista security before placing the device in service.
  • Page 137 Enter a username in the User field. The username must be 4 to 20 characters in length. Select the user access rights by enabling the check box of one or more of the fields. GE Multilin C70 Capacitor Bank Protection and Control System 5-13...
  • Page 138 Deletes the user account when exiting the user management window Actual Values Allows the user to read actual values Settings Allows the user to read setting values Commands Allows the user to execute commands 5-14 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 139 No password or security information is displayed in plain text by the EnerVista software or UR device, nor are they ever transmitted without cryptographic protection. GE Multilin C70 Capacitor Bank Protection and Control System 5-15...
  • Page 140 5.2 PRODUCT SETUP 5 SETTINGS CYBERSENTRY SETTINGS THROUGH ENERVISTA CyberSentry security settings are configured under Device > Settings > Product Setup > Security. Figure 5–2: CYBERSENTRY SECURITY PANEL 5-16 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 141 EAP-TTLS EAP-TTLS EAP-TTLS Administrator Authentication server. Currently fixed to EAP-TTLS. Method Timeout Timeout in seconds between re- 9999 Administrator transmission requests Retries Number of retries before giving up 9999 Administrator GE Multilin C70 Capacitor Bank Protection and Control System 5-17...
  • Page 142 The specified role password-protected. All RADIUS users are following following Me1# and Administrator, password-protected. password password except for section for section for Supervisor, where requirements requireme it is only itself 5-18 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 143 This role can also be disabled, but only through a Supervisor authentication. When this role is disabled its permissions are assigned to the Administrator role. GE Multilin C70 Capacitor Bank Protection and Control System 5-19...
  • Page 144 LOAD FACTORY DEFAULTS: This setting is used to reset all the settings, communication and security passwords. An Administrator role is used to change this setting and a Supervisor role (if not disabled) approves it. 5-20 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 145 When enabled (i.e., "Yes" is selected) the device can go into factory service mode. For this set- ting to become enabled a Supervisor authentication is necessary. The default value is Disabled. GE Multilin C70 Capacitor Bank Protection and Control System 5-21...
  • Page 146 The use of CyberSentry for devices communicating through an Ethernet-to-RS485 gateway is not supported. Because these gateways do not support the secure protocols necessary to communicate with such devices, the connection cannot be established. Use the device as a non-CyberSentry device. 5-22 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 147: Display Properties

    Range: 0.1 to 1.0 V secondary in steps of 0.1 VOLTAGE CUT-OFF MESSAGE LEVEL: 1.0 V Some relay messaging characteristics can be modified to suit different situations using the display properties settings. GE Multilin C70 Capacitor Bank Protection and Control System 5-23...
  • Page 148 Some customers prefer very low currents to display as zero, while others prefer the current be displayed even when the value reflects noise rather than the actual signal. The C70 applies a cut- off value to the magnitudes and angles of the measured currents.
  • Page 149: Clear Relay Records

    Selected records can be cleared from user-programmable conditions with FlexLogic operands. Assigning user-programma- ble pushbuttons to clear specific records are typical applications for these commands. Since the C70 responds to rising edges of the configured FlexLogic operands, they must be asserted for at least 50 ms to take effect.
  • Page 150: Communications

    0 ms The C70 is equipped with up to two independent serial communication ports. The faceplate RS232 port is intended for local use and is fixed at 19200 baud and no parity. The rear COM2 port is RS485. The RS485 port has settings for baud rate and parity.
  • Page 151 The topology shown in the following figure allows communications to SCADA, local configuration/monitoring through EnerVista, and access to the public network shared on the same LAN. No redundancy is provided. Figure 5–4: NETWORK CONFIGURATION FOR SINGLE LAN GE Multilin C70 Capacitor Bank Protection and Control System 5-27...
  • Page 152 LAN2, to which port 2 (P2) is connected and communications with SCADA on LAN3, to which port 3 (P3) is connected. There is no redundancy. Figure 5–6: MULTIPLE LANS, NO REDUNDANCY 5-28 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 153 Failover, the operation of ports 2 and 3 is as follows: • Ports 2 and 3 use the port 2 MAC address, IP address, and mask • The configuration fields for IP address and mask on port 3 are hidden GE Multilin C70 Capacitor Bank Protection and Control System 5-29...
  • Page 154 There is a second type of specialized device used in PRP networks, called RedBox, with the role of connecting Single Attached Nodes (SANs) to a redundant network. UR relays implement only the DANP functionality. The RedBox functionality is not implemented. 5-30 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 155 1 to 6, that entry becomes a static route and it must meet all the rules listed in the next section, General Conditions to be Satisfied by Static Routes. GE Multilin C70 Capacitor Bank Protection and Control System 5-31...
  • Page 156 Port 1 (IP address 10.1.1.2) connects the UR to LAN 10.1.1.0/24 and to the Internet through Router1. Router 1 has an interface on 10.1.1.0/24 and the IP address of this interface is 10.1.1.1. 5-32 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 157 Age, in minutes, of the cache entry. A hyphen (-) means the address is local. Hardware Address LAN hardware address, a MAC address that corresponds to network address Type Dynamic or Static Interface Interface to which this address mapping has been assigned GE Multilin C70 Capacitor Bank Protection and Control System 5-33...
  • Page 158 MODBUS SLAVE ADDRESS RS485 port, each C70 must have a unique address from 1 to 254. Address 0 is the broadcast address which all Modbus slave devices listen to. Addresses do not have to be sequential, but no two devices can have the same address or conflicts resulting in errors will occur.
  • Page 159 TIMEOUT: 120 s The C70 supports the Distributed Network Protocol (DNP) version 3.0. The C70 can be used as a DNP slave device con- nected to multiple DNP masters (usually an RTU or a SCADA master station). Since the C70 maintains two sets of DNP data change buffers and connection information, two DNP masters can actively communicate with the C70 at one time.
  • Page 160 DNP analog input points that are voltages will be returned with values 1000 times smaller (for example, a value of 72000 V on the C70 will be returned as 72). These settings are useful when analog input values must be adjusted to fit within cer- tain ranges in DNP masters.
  • Page 161 When the DNP data points (analog inputs and/or binary inputs) are configured for Ethernet-enabled relays, check the “DNP Points Lists” C70 web page to view the points lists. This page can be viewed with a web browser by enter- ing the C70 IP address to access the C70 “Main Menu”, then by selecting the “Device Information Menu” > “DNP NOTE Points Lists”...
  • Page 162 60870-5-104 point lists must be in one continuous block, any points assigned after the first “Off” point are ignored. NOTE Changes to the DNP / IEC 60870-5-104 point lists will not take effect until the C70 is restarted. NOTE j) IEC 61850 PROTOCOL ...
  • Page 163 The C70 supports the Manufacturing Message Specification (MMS) protocol as specified by IEC 61850. MMS is supported over two protocol stacks: TCP/IP over Ethernet. The C70 operates as an IEC 61850 server. The Remote inputs and outputs section in this chapter describe the peer-to-peer GSSE/GOOSE message scheme.
  • Page 164 DESTINATION MAC address; the least significant bit of the first byte must be set. In C70 releases previous to 5.0x, the destination Ethernet MAC address was determined automatically by taking the sending MAC address (that is, the unique, local MAC address of the C70) and setting the multicast bit.
  • Page 165 The C70 has the ability of detecting if a data item in one of the GOOSE datasets is erroneously oscillating. This can be caused by events such as errors in logic programming, inputs improperly being asserted and de-asserted, or failed station components.
  • Page 166 Configure the transmission dataset. Configure the GOOSE service settings. Configure the data. The general steps required for reception configuration are: Configure the reception dataset. Configure the GOOSE service settings. Configure the data. 5-42 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 167 MMXU1 HZ DEADBAND change greater than 45 mHz, from the previous MMXU1.MX.mag.f value, in the source frequency. The C70 must be rebooted (control power removed and re-applied) before these settings take effect. The following procedure illustrates the reception configuration. Configure the reception dataset by making the following changes in the ...
  • Page 168 IEC61850 GOOSE ANALOG INPUT 1 UNITS The GOOSE analog input 1 can now be used as a FlexAnalog value in a FlexElement or in other settings. The C70 must be rebooted (control power removed and re-applied) before these settings take effect.
  • Page 169 DNA and UserSt bit pairs that are included in GSSE messages. To set up a C70 to receive a configurable GOOSE dataset that contains two IEC 61850 single point status indications, the following dataset items can be selected (for example, for configurable GOOSE dataset 1): “GGIO3.ST.Ind1.stVal” and “GGIO3.ST.Ind2.stVal”.
  • Page 170 CPU resources. When server scanning is disabled, there is no updating of the IEC 61850 logical node status values in the C70. Clients are still able to connect to the server (C70 relay), but most data values are not updated. This set- ting does not affect GOOSE/GSSE operation.
  • Page 171 (_) character, and the first character in the prefix must be a letter. This conforms to the IEC 61850 standard. Changes to the logical node prefixes will not take effect until the C70 is restarted. The main menu for the IEC 61850 MMXU deadbands is shown below.
  • Page 172 The GGIO2 control configuration settings are used to set the control model for each input. The available choices are “0” (status only), “1” (direct control), and “2” (SBO with normal security). The GGIO2 control points are used to control the C70 virtual inputs.
  • Page 173 GGIO1 (binary status values). The settings allow the selection of FlexInteger values for each GGIO5 integer value point. It is intended that clients use GGIO5 to access generic integer values from the C70. Additional settings are provided to allow the selection of the number of integer values available in GGIO5 (1 to 16), and to assign FlexInteger values to the GGIO5 integer inputs.
  • Page 174 ITEM 64 attributes supported by the C70. Changes to the dataset will only take effect when the C70 is restarted. It is recommended to use reporting service from logical node LLN0 if a user needs some (but not all) data from already existing GGIO1, GGIO4, and MMXU4 points and their quantity is not greater than 64 minus the number items in this dataset.
  • Page 175 XCBR operating counter status attribute (OpCnt) increments with every operation. Frequent breaker operation can result in very large OpCnt values over time. This setting allows the OpCnt to be reset to “0” for XCBR1. GE Multilin C70 Capacitor Bank Protection and Control System 5-51...
  • Page 176 Since GSSE/GOOSE messages are multicast Ethernet by specification, they are not usually be forwarded by net- work routers. However, GOOSE messages may be forwarded by routers if the router has been configured for VLAN functionality. NOTE 5-52 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 177 Menu”. Web pages are available showing DNP and IEC 60870-5-104 points lists, Modbus registers, event records, fault reports, and so on. First connect the UR and a computer to an Ethernet network, then enter the IP address of the C70 into the “Address”...
  • Page 178 The C70 supports the IEC 60870-5-104 protocol. The C70 can be used as an IEC 60870-5-104 slave device connected to a maximum of two masters (usually either an RTU or a SCADA master station). Since the C70 maintains two sets of IEC 60870-5-104 data change buffers, no more than two masters should actively communicate with the C70 at one time.
  • Page 179 MESSAGE  CONFIGURATION The C70 Capacitor Bank Protection and Control System is provided with optional Ethernet Global Data (EGD) communications capability. This feature is specified as a software option at the time of ordering. See the Ordering section of chapter 2 for additional details.
  • Page 180 MESSAGE (Modbus register address range) Fast exchanges (50 to 1000 ms) are generally used in control schemes. The C70 has one fast exchange (exchange 1) and two slow exchanges (exchange 2 and 3). The settings menu for the slow EGD exchanges is shown below: ...
  • Page 181: Modbus User Map

    EXCH 1 DATA ITEM 1 to 20/50: These settings specify the data items that are part of this EGD exchange. Almost any data from the C70 memory map can be configured to be included in an EGD exchange. The settings are the starting Modbus register address for the data item in decimal format.
  • Page 182 The relay implements PTP according to IEEE Std 1588 2008 and the equivalent IEC 61588:2009(E), sometimes referred to as version 2 PTP. It does not support the previous version of the standard (version 1). NOTE 5-58 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 183 Depending on the characteristics of the device to which the relay is directly linked, VLAN ID may have no effect. • This setting applies to all of the relay’s PTP capable ports. GE Multilin C70 Capacitor Bank Protection and Control System 5-59...
  • Page 184 The C70 supports the Simple Network Time Protocol specified in RFC-2030. With SNTP, the C70 can obtain clock time over an Ethernet network. The C70 acts as an SNTP client to receive time values from an SNTP/NTP server, usually a ded- icated product using a GPS receiver to provide an accurate time.
  • Page 185 DAYLIGHT SAVINGS TIME (DST) Note that when IRIG-B time synchronization is active, the local time in the IRIG-B signal contains any daylight savings time offset and so the DST settings are ignored. GE Multilin C70 Capacitor Bank Protection and Control System 5-61...
  • Page 186: User-Programmable Fault Reports

    The user programmable record contains the following information: the user-programmed relay name, detailed firmware revision (7.1x, for example) and relay model (C70), the date and time of trigger, the name of pre-fault trigger (a specific FlexLogic operand), the name of fault trigger (a specific FlexLogic operand), the active setting group at pre-fault trigger, the active setting group at fault trigger, pre-fault values of all programmed analog channels (one cycle before pre-fault trigger), and fault values of all programmed analog channels (at the fault trigger).
  • Page 187: Oscillography

    64 samples per cycle; that is, it has no effect on the fundamental calculations of the device. When changes are made to the oscillography settings, all existing oscillography records will be CLEARED. NOTE GE Multilin C70 Capacitor Bank Protection and Control System 5-63...
  • Page 188 IB signal on terminal 2 of the CT/VT module in slot F. If there are no CT/VT modules and analog input modules, no analog traces will appear in the file; only the digital traces will appear. 5-64 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 189: Data Logger

    The relay automatically partitions the available memory between the channels in use. Exam- ple storage capacities for a system frequency of 60 Hz are shown in the following table. GE Multilin C70 Capacitor Bank Protection and Control System 5-65...
  • Page 190 • DATA LOGGER CONFIG: This display presents the total amount of time the Data Logger can record the channels not selected to “Off” without over-writing old data. 5-66 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 191: User-Programmable Leds

    The test responds to the position and rising edges of the control input defined by the set- LED TEST CONTROL ting. The control pulses must last at least 250 ms to take effect. The following diagram explains how the test is executed. GE Multilin C70 Capacitor Bank Protection and Control System 5-67...
  • Page 192 2. Once stage 2 has started, the pushbutton can be released. When stage 2 is completed, stage 3 will automatically start. The test may be aborted at any time by pressing the pushbutton. 5-68 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 193 LED 8 operand LED 20 operand LED 9 operand LED 21 operand LED 10 operand LED 22 operand LED 11 operand LED 23 operand LED 12 operand LED 24 operand GE Multilin C70 Capacitor Bank Protection and Control System 5-69...
  • Page 194: User-Programmable Self Tests

    Refer to the Relay self-tests section in chapter 7 for additional information on major and minor self-test alarms. 5-70 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 195: Control Pushbuttons

    The location of the control pushbuttons are shown in the following figures. Control pushbuttons 842813A1.CDR Figure 5–10: CONTROL PUSHBUTTONS (ENHANCED FACEPLATE) An additional four control pushbuttons are included on the standard faceplate when the C70 is ordered with the twelve user-programmable pushbutton option. STATUS EVENT CAUSE...
  • Page 196: User-Programmable Pushbuttons

    MESSAGE TIME: 0.00 s Range: FlexLogic operand PUSHBTN 1 LED CTL: MESSAGE Range: Disabled, Normal, High Priority PUSHBTN 1 MESSAGE: MESSAGE Disabled Range: Disabled, Enabled PUSHBUTTON 1 MESSAGE EVENTS: Disabled 5-72 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 197 The pushbutton is reset (deactivated) in latched mode by asserting the operand assigned to the set- PUSHBTN 1 RESET ting or by directly pressing the associated active front panel pushbutton. GE Multilin C70 Capacitor Bank Protection and Control System 5-73...
  • Page 198 This timer is reset upon release of the pushbutton. Note that any pushbutton operation will require the pushbutton to be pressed a minimum of 50 ms. This minimum time is required prior to activating the pushbutton hold timer. 5-74 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 199 “High Priority” or “Normal”. PUSHBTN 1 MESSAGE • PUSHBUTTON 1 EVENTS: If this setting is enabled, each pushbutton state change will be logged as an event into event recorder. GE Multilin C70 Capacitor Bank Protection and Control System 5-75...
  • Page 200 SETTING Autoreset Delay Autoreset Function = Enabled = Disabled SETTING Drop-Out Timer TIMER FLEXLOGIC OPERAND 200 ms PUSHBUTTON 1 ON 842021A3.CDR Figure 5–15: USER-PROGRAMMABLE PUSHBUTTON LOGIC (Sheet 1 of 2) 5-76 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 201: Flex State Parameters

    PRODUCT SETUP FLEX STATE PARAMETERS Range: FlexLogic operand  FLEX STATE PARAMETER  PARAMETERS Range: FlexLogic operand PARAMETER MESSAGE Range: FlexLogic operand PARAMETER MESSAGE  Range: FlexLogic operand PARAMETER 256: MESSAGE GE Multilin C70 Capacitor Bank Protection and Control System 5-77...
  • Page 202: User-Definable Displays

    INVOKE AND SCROLL play, not at the first user-defined display. The pulses must last for at least 250 ms to take effect. INVOKE AND SCROLL 5-78 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 203 While viewing a user display, press the ENTER key and then select the ‘Yes” option to remove the display from the user display list. Use the MENU key again to exit the user displays menu. GE Multilin C70 Capacitor Bank Protection and Control System 5-79...
  • Page 204: Direct Inputs And Outputs

      CRC ALARM CH2 See page 5–86. MESSAGE   UNRETURNED See page 5–87. MESSAGE  MESSAGES ALARM CH1  UNRETURNED See page 5–87. MESSAGE  MESSAGES ALARM CH2 5-80 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 205 Delivery time for direct input and output messages is approximately 0.2 of a power system cycle at 128 kbps and 0.4 of a power system cycle at 64 kbps, per each ‘bridge’. GE Multilin C70 Capacitor Bank Protection and Control System 5-81...
  • Page 206 The following application examples illustrate the basic concepts for direct input and output configuration. Please refer to the Inputs and outputs section in this chapter for information on configuring FlexLogic operands (flags, bits) to be exchanged. 5-82 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 207 UR IED 4 UR IED 2 UR IED 3 842712A1.CDR Figure 5–18: SAMPLE INTERLOCKING BUSBAR PROTECTION SCHEME For increased reliability, a dual-ring configuration (shown below) is recommended for this application. GE Multilin C70 Capacitor Bank Protection and Control System 5-83...
  • Page 208 The complete application requires addressing a number of issues such as failure of both the communications rings, failure or out-of-service conditions of one of the relays, etc. Self-monitoring flags of the direct inputs and outputs feature would be primarily used to address these concerns. 5-84 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 209 Inputs and outputs section. A blocking pilot-aided scheme should be implemented with more security and, ideally, faster message delivery time. This could be accomplished using a dual-ring configuration as shown below. GE Multilin C70 Capacitor Bank Protection and Control System 5-85...
  • Page 210 EVENTS: Disabled The C70 checks integrity of the incoming direct input and output messages using a 32-bit CRC. The CRC alarm function is available for monitoring the communication medium noise by tracking the rate of messages failing the CRC check. The monitoring function counts all incoming messages, including messages that failed the CRC check.
  • Page 211 MESSAGE EVENTS: Disabled The C70 checks integrity of the direct input and output communication ring by counting unreturned messages. In the ring configuration, all messages originating at a given device should return within a pre-defined period of time. The unreturned messages alarm function is available for monitoring the integrity of the communication ring by tracking the rate of unre- turned messages.
  • Page 212: Installation

    "Programmed" state. UNIT NOT PROGRAMMED setting allows the user to uniquely identify a relay. This name will appear on generated reports. RELAY NAME 5-88 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 213: Remote Resources Configuration

    Bricks. Remote resources settings configure the point-to-point connection between specific fiber optic ports on the C70 process card and specific Brick. The relay is then configured to measure spe- cific currents, voltages and contact inputs from those Bricks, and to control specific outputs.
  • Page 214: System Setup

    1 pu will operate on 1000 A primary. The same rule applies for current sums from CTs with different secondary taps (5 A and 1 A). 5-90 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 215: Power System

    GE Multilin C70 Capacitor Bank Protection and Control System 5-91...
  • Page 216 “Disabled” only in unusual circumstances; consult the factory for special variable- FREQUENCY TRACKING frequency applications. NOTE The frequency tracking feature functions only when the C70 is in the “Programmed” mode. If the C70 is “Not Pro- grammed”, then metering values are available but can exhibit significant errors. NOTE 5-92...
  • Page 217: Signal Sources

    CT wiring problem. A disturbance detector is provided for each source. The 50DD function responds to the changes in magnitude of the sequence currents. The disturbance detector scheme logic is as follows: GE Multilin C70 Capacitor Bank Protection and Control System 5-93...
  • Page 218 CT/VT inputs that are used to provide the data. DSP Bank Source 1 Source 2 Amps Amps Source 3 51BF-1 51BF-2 Volts Amps Volts Amps Source 4 UR Relay Figure 5–25: EXAMPLE USE OF SOURCES 5-94 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 219 5 SETTINGS 5.4 SYSTEM SETUP Y LV D HV SRC 1 SRC 2 SRC 3 Phase CT F1+F5 None Ground CT None None Phase VT None None Aux VT None None GE Multilin C70 Capacitor Bank Protection and Control System 5-95...
  • Page 220: Breakers

    Range: 0.000 to 65.535 s in steps of 0.001 MANUAL CLOSE RECAL1 MESSAGE TIME: 0.000 s Range: FlexLogic operand BREAKER 1 OUT OF SV: MESSAGE Range: Disabled, Enabled BREAKER 1 EVENTS: MESSAGE Disabled 5-96 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 221 1. The number of breaker control elements is dependent on the number of CT/VT modules specified with the C70. The follow- ing settings are available for each breaker control element.
  • Page 222 5.4 SYSTEM SETUP 5 SETTINGS Figure 5–26: DUAL BREAKER CONTROL SCHEME LOGIC (Sheet 1 of 2) IEC 61850 functionality is permitted when the C70 is in “Programmed” mode and not in the local control mode. NOTE 5-98 C70 Capacitor Bank Protection and Control System...
  • Page 223 Note that IEC 61850 commands are event-driven and dwell time for these is one protection pass only. If you want to main- tain the close/open command for a certain time, do so either on the contact outputs using the "Seal-in" setting or in Flex- Logic. GE Multilin C70 Capacitor Bank Protection and Control System 5-99...
  • Page 224: Disconnect Switches

    For greater security in determination of the switch pole position, both the 89/a and 89/b auxiliary contacts are used with reporting of the discrepancy between them. The number of available disconnect switches depends on the number of the CT/VT modules ordered with the C70. •...
  • Page 225 This allows for non-simultaneous operation of the poles. IEC 61850 functionality is permitted when the C70 is in “Programmed” mode and not in the local control mode. NOTE GE Multilin...
  • Page 226 5.4 SYSTEM SETUP 5 SETTINGS Figure 5–28: DISCONNECT SWITCH SCHEME LOGIC 5-102 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 227: Flexcurves

    0.88 15.5 0.50 0.90 16.0 0.52 0.91 16.5 0.54 0.92 17.0 0.56 0.93 17.5 0.58 0.94 18.0 0.60 0.95 18.5 0.62 0.96 19.0 0.64 0.97 19.5 0.66 0.98 10.0 20.0 GE Multilin C70 Capacitor Bank Protection and Control System 5-103...
  • Page 228 The multiplier and adder settings only affect the curve portion of the characteristic and not the MRT and HCT set- tings. The HCT settings override the MRT settings for multiples of pickup greater than the HCT ratio. NOTE 5-104 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 229 EnerVista UR Setup software generates an error message and discards the proposed changes. NOTE e) STANDARD RECLOSER CURVES The standard recloser curves available for the C70 are displayed in the following graphs. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 230 Figure 5–32: RECLOSER CURVES GE101 TO GE106 GE142 GE138 GE120 GE113 0.05 7 8 9 10 12 CURRENT (multiple of pickup) 842725A1.CDR Figure 5–33: RECLOSER CURVES GE113, GE120, GE138 AND GE142 5-106 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 231 Figure 5–34: RECLOSER CURVES GE134, GE137, GE140, GE151 AND GE201 GE152 GE141 GE131 GE200 7 8 9 10 12 CURRENT (multiple of pickup) 842728A1.CDR Figure 5–35: RECLOSER CURVES GE131, GE141, GE152, AND GE200 GE Multilin C70 Capacitor Bank Protection and Control System 5-107...
  • Page 232 GE132 GE139 GE136 GE116 0.05 GE117 GE118 0.02 0.01 7 8 9 10 12 CURRENT (multiple of pickup) 842726A1.CDR Figure 5–37: RECLOSER CURVES GE116, GE117, GE118, GE132, GE136, AND GE139 5-108 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 233 Figure 5–38: RECLOSER CURVES GE107, GE111, GE112, GE114, GE115, GE121, AND GE122 GE202 GE135 GE119 7 8 9 10 12 CURRENT (multiple of pickup) 842727A1.CDR Figure 5–39: RECLOSER CURVES GE119, GE135, AND GE202 GE Multilin C70 Capacitor Bank Protection and Control System 5-109...
  • Page 234: Flexlogic

    Figure 5–40: UR ARCHITECTURE OVERVIEW The states of all digital signals used in the C70 are represented by flags (or FlexLogic operands, which are described later in this section). A digital “1” is represented by a 'set' flag. Any external contact change-of-state can be used to block an ele- ment from operating, as an input to a control feature in a FlexLogic equation, or to operate a contact output.
  • Page 235 The virtual input is presently in the ON state. Virtual Output Virt Op 1 On The virtual output is presently in the set state (i.e. evaluation of the equation which produces this virtual output results in a "1"). GE Multilin C70 Capacitor Bank Protection and Control System 5-111...
  • Page 236 5.5 FLEXLOGIC 5 SETTINGS The operands available for this relay are listed alphabetically by types in the following table. Table 5–12: C70 FLEXLOGIC OPERANDS (Sheet 1 of 9) OPERAND TYPE OPERAND SYNTAX OPERAND DESCRIPTION CONTROL CONTROL PUSHBTN 1 ON Control pushbutton 1 is being pressed...
  • Page 237 5 SETTINGS 5.5 FLEXLOGIC Table 5–12: C70 FLEXLOGIC OPERANDS (Sheet 2 of 9) OPERAND TYPE OPERAND SYNTAX OPERAND DESCRIPTION ELEMENT BKR 1 FLSHOVR PKP A Breaker 1 flashover element phase A has picked up Breaker flashover BKR 1 FLSHOVR PKP B...
  • Page 238 5.5 FLEXLOGIC 5 SETTINGS Table 5–12: C70 FLEXLOGIC OPERANDS (Sheet 3 of 9) OPERAND TYPE OPERAND SYNTAX OPERAND DESCRIPTION ELEMENT: Counter 1 HI Digital counter 1 output is ‘more than’ comparison value Digital counters Counter 1 EQL Digital counter 1 output is ‘equal to’ comparison value Counter 1 LO Digital counter 1 output is ‘less than’...
  • Page 239 5 SETTINGS 5.5 FLEXLOGIC Table 5–12: C70 FLEXLOGIC OPERANDS (Sheet 4 of 9) OPERAND TYPE OPERAND SYNTAX OPERAND DESCRIPTION ELEMENT: MONTH JANUARY Current month is January Time of day timer MONTH FEBRUARY Current month is February month MONTH MARCH Current month is March...
  • Page 240 5.5 FLEXLOGIC 5 SETTINGS Table 5–12: C70 FLEXLOGIC OPERANDS (Sheet 5 of 9) OPERAND TYPE OPERAND SYNTAX OPERAND DESCRIPTION ELEMENT: PH DIR1 BLK A Phase A directional 1 block Phase directional PH DIR1 BLK B Phase B directional 1 block...
  • Page 241 5 SETTINGS 5.5 FLEXLOGIC Table 5–12: C70 FLEXLOGIC OPERANDS (Sheet 6 of 9) OPERAND TYPE OPERAND SYNTAX OPERAND DESCRIPTION ELEMENT: SH STAT GND STG1 PKP Stage 1 of the sub-harmonic stator ground protection has picked up Sub-harmonic stator SH STAT GND STG1 DPO...
  • Page 242 5.5 FLEXLOGIC 5 SETTINGS Table 5–12: C70 FLEXLOGIC OPERANDS (Sheet 7 of 9) OPERAND TYPE OPERAND SYNTAX OPERAND DESCRIPTION ELEMENT: VOLT DIF 1 STG1A PKP Voltage differential element 1 picked up in phase A of stage 1 Voltage differential VOLT DIF 1 STG1B PKP...
  • Page 243 5 SETTINGS 5.5 FLEXLOGIC Table 5–12: C70 FLEXLOGIC OPERANDS (Sheet 8 of 9) OPERAND TYPE OPERAND SYNTAX OPERAND DESCRIPTION INPUTS/OUTPUTS: Virt Ip 1 Flag is set, logic=1 Virtual inputs Virt Ip 2 Flag is set, logic=1 Virt Ip 3 Flag is set, logic=1 ...
  • Page 244 5.5 FLEXLOGIC 5 SETTINGS Table 5–12: C70 FLEXLOGIC OPERANDS (Sheet 9 of 9) OPERAND TYPE OPERAND SYNTAX OPERAND DESCRIPTION SELF- ANY MAJOR ERROR Any of the major self-test errors generated (major error) DIAGNOSTICS ANY MINOR ERROR Any of the minor self-test errors generated (minor error)
  • Page 245: Flexlogic Rules

    If it is necessary to re-initialize FlexLogic during testing, for example, it is suggested to power the unit down and then back up. GE Multilin C70 Capacitor Bank Protection and Control System 5-121...
  • Page 246: Flexlogic Example

    State=Pickup (200 ms) DIGITAL ELEMENT 2 Timer 1 State=Operated Time Delay on Pickup (800 ms) CONTACT INPUT H1c State=Closed VIRTUAL OUTPUT 3 827026A2.VSD Figure 5–42: LOGIC EXAMPLE WITH VIRTUAL OUTPUTS 5-122 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 247 Following the procedure outlined, start with parameter 99, as follows: 99: The final output of the equation is virtual output 3, which is created by the operator "= Virt Op n". This parameter is therefore "= Virt Op 3." GE Multilin C70 Capacitor Bank Protection and Control System 5-123...
  • Page 248 86: The upper input to OR #1 is operand “Virt Op 1 On". 85: The last parameter is used to set the latch, and is operand “Virt Op 4 On". 5-124 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 249 In the following equation, virtual output 3 is used as an input to both latch 1 and timer 1 as arranged in the order shown below: DIG ELEM 2 OP Cont Ip H1c On AND(2) GE Multilin C70 Capacitor Bank Protection and Control System 5-125...
  • Page 250: Flexlogic Equation Editor

    TIMER 1 TYPE: This setting is used to select the time measuring unit. • TIMER 1 PICKUP DELAY: Sets the time delay to pickup. If a pickup delay is not required, set this function to "0". 5-126 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 251: Flexelements

    The element can be programmed to respond either to a signal level or to a rate-of-change (delta) over a pre-defined period of time. The output operand is asserted when the operating signal is higher than a threshold or lower than a threshold as per user's choice. GE Multilin C70 Capacitor Bank Protection and Control System 5-127...
  • Page 252 The FLEXELEMENT 1 DIRECTION following figure explains the application of the FLEXELEMENT 1 DIRECTION FLEXELEMENT 1 PICKUP FLEXELEMENT 1 HYS- settings. TERESIS 5-128 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 253 FLEXELEMENT INPUT MODE = Signed; FlexElement 1 OpSig FLEXELEMENT 1 PKP FLEXELEMENT DIRECTION = Under; FLEXELEMENT INPUT MODE = Absolute; FlexElement 1 OpSig 842706A2.CDR Figure 5–50: FLEXELEMENT INPUT MODE SETTING GE Multilin C70 Capacitor Bank Protection and Control System 5-129...
  • Page 254 FLEXELEMENT 1 COMP MODE This setting specifies the pickup delay of the element. The setting FLEXELEMENT 1 PKP DELAY FLEXELEMENT 1 RST DELAY specifies the reset delay of the element. 5-130 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 255: Non-Volatile Latches

    LATCH N LATCH N TYPE RESET Reset Dominant Previous Previous State State Dominant Previous Previous State State Figure 5–51: NON-VOLATILE LATCH OPERATION TABLE (N = 1 to 16) AND LOGIC GE Multilin C70 Capacitor Bank Protection and Control System 5-131...
  • Page 256: Grouped Elements

    Each of the six setting group menus is identical. Setting group 1 (the default active group) automatically becomes active if no other group is active (see the Control elements section for additional details). 5-132 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 257 Range: 0.001 to 30.000 pu in steps of 0.001 BF1 N AMP HISET MESSAGE PICKUP: 1.050 pu Range: 0.001 to 30.000 pu in steps of 0.001 BF1 PH AMP LOSET MESSAGE PICKUP: 1.050 pu GE Multilin C70 Capacitor Bank Protection and Control System 5-133...
  • Page 258 5-134 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 259 BREAKER FAILURE TIMER No. 2 (±1/8 cycle) INITIATE (1/8 cycle) BREAKER FAILURE CURRENT DETECTOR PICKUP (1/8 cycle) BREAKER FAILURE OUTPUT RELAY PICKUP (1/4 cycle) FAULT cycles OCCURS 827083A6.CDR Figure 5–52: BREAKER FAILURE MAIN PATH SEQUENCE GE Multilin C70 Capacitor Bank Protection and Control System 5-135...
  • Page 260 In microprocessor relays this time is not significant. In C70 relays, which use a Fourier transform, the calculated current magnitude will ramp-down to zero one power frequency cycle after the current is interrupted, and this lag should be included in the overall margin duration, as it occurs after current interruption.
  • Page 261 Upon operation of the breaker failure element for a single pole trip command, a three-pole trip command should be given via output operand BKR FAIL 1 TRIP OP GE Multilin C70 Capacitor Bank Protection and Control System 5-137...
  • Page 262 5.6 GROUPED ELEMENTS 5 SETTINGS Figure 5–54: SINGLE-POLE BREAKER FAILURE, INITIATE 5-138 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 263 5 SETTINGS 5.6 GROUPED ELEMENTS Figure 5–55: SINGLE-POLE BREAKER FAILURE, TIMERS GE Multilin C70 Capacitor Bank Protection and Control System 5-139...
  • Page 264 5.6 GROUPED ELEMENTS 5 SETTINGS Figure 5–56: THREE-POLE BREAKER FAILURE, INITIATE 5-140 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 265 5 SETTINGS 5.6 GROUPED ELEMENTS Figure 5–57: THREE-POLE BREAKER FAILURE, TIMERS GE Multilin C70 Capacitor Bank Protection and Control System 5-141...
  • Page 266: Phase Current

     PHASE CURRENT See page 5–154. MESSAGE  UNBALANCE 1  PHASE CURRENT See page 5–154. MESSAGE  UNBALANCE 2  PHASE CURRENT See page 5–154. MESSAGE  UNBALANCE 3 5-142 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 267 5.6 GROUPED ELEMENTS b) INVERSE TOC CURVE CHARACTERISTICS The inverse time overcurrent curves used by the time overcurrent elements are the IEEE, IEC, GE Type IAC, and I t stan- dard curve shapes. This allows for simplified coordination with downstream devices.
  • Page 268 22.819 14.593 11.675 10.130 9.153 8.470 7.960 7.562 7.241 51.512 30.426 19.458 15.567 13.507 12.204 11.294 10.614 10.083 9.654 10.0 64.390 38.032 24.322 19.458 16.883 15.255 14.117 13.267 12.604 12.068 5-144 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 269 0.668 0.526 0.451 0.404 0.371 0.346 0.327 0.311 0.80 2.446 1.423 0.890 0.702 0.602 0.538 0.494 0.461 0.435 0.415 1.00 3.058 1.778 1.113 0.877 0.752 0.673 0.618 0.576 0.544 0.518 GE Multilin C70 Capacitor Bank Protection and Control System 5-145...
  • Page 270 = characteristic constant, and T = reset time in seconds (assuming energy capacity is 100% RESET is “Timed”) RESET Table 5–21: GE TYPE IAC INVERSE TIME CURVE CONSTANTS IAC CURVE SHAPE IAC Extreme Inverse 0.0040 0.6379 0.6200 1.7872 0.2461...
  • Page 271 = Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed) RESET RECLOSER CURVES: The C70 uses the FlexCurve feature to facilitate programming of 41 recloser curves. Please refer to the FlexCurve section in this chapter for additional details. GE Multilin...
  • Page 272 ‘Mvr’ times the setting. If the voltage restraint feature PHASE TOC1 PICKUP is disabled, the pickup level always remains at the setting value. 5-148 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 273 5 SETTINGS 5.6 GROUPED ELEMENTS Phase-Phase Voltage ÷ VT Nominal Phase-phase Voltage 818784A4.CDR Figure 5–58: PHASE TIME OVERCURRENT VOLTAGE RESTRAINT CHARACTERISTIC Figure 5–59: PHASE TIME OVERCURRENT 1 SCHEME LOGIC GE Multilin C70 Capacitor Bank Protection and Control System 5-149...
  • Page 274 The input current is the fundamental phasor magnitude. For timing curves, see the publication Instan- taneous Overcurrent Element Response to Saturated Waveforms in UR-Series Relays (GET-8400A). Figure 5–60: PHASE INSTANTANEOUS OVERCURRENT 1 SCHEME LOGIC 5-150 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 275 (ECA) settings. GE Multilin C70 Capacitor Bank Protection and Control System 5-151...
  • Page 276 10 ms must be added to all the instantaneous protection elements under the supervi- sion of the phase directional element. If current reversal is of a concern, a longer delay – in the order of 20 ms – may be needed. 5-152 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 277 5 SETTINGS 5.6 GROUPED ELEMENTS Figure 5–62: PHASE DIRECTIONAL SCHEME LOGIC GE Multilin C70 Capacitor Bank Protection and Control System 5-153...
  • Page 278 Range: 0.00 to 600.00 s in steps of 0.01 CUR UNBALCE 1 STG 2 MESSAGE PKP DELAY: 10.00 s Range: 0.00 to 600.00 s in steps of 0.01 CUR UNBALCE 1 STG 3 MESSAGE PKP DELAY: 1.00 s 5-154 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 279 SOURCE CT bank Grounding method not relevant, neutral points must be connected together 8347516A1.CDR Figure 5–63: PHASE CURRENT UNBALANCE BASIC CONNECTIONS The following settings are available for all three elements. GE Multilin C70 Capacitor Bank Protection and Control System 5-155...
  • Page 280 CUR BAL 1 PKP C FLEXLOGIC OPERAND FLEXLOGIC OPERAND CUR BAL 1 PKP CUR BAL 1 OP PHASE C CUR BAL 1 DPO 834729A2.CDR Figure 5–64: PHASE CURRENT UNBALANCE SCHEME LOGIC 5-156 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 281: Neutral Current

    MESSAGE  UNBALANCE 3 The C70 contains protection elements for neutral time overcurrent (ANSI device 51G), neutral instantaneous overcurrent (ANSI device 50G), and neutral current unbalance (ANSI device 60N). A maximum of six ground time overcurrent and twelve ground instantaneous overcurrent elements are available, dependent on the CT/VT modules ordered with the relay.
  • Page 282 For example, if the element reset characteristic is set to “Instan- taneous” and the element is blocked, the time accumulator will be cleared immediately. Figure 5–65: NEUTRAL TIME OVERCURRENT 1 SCHEME LOGIC 5-158 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 283 The operating quantity depends on how test currents are injected into the relay (single-phase injection:   0.9375 I ; three-phase pure zero-sequence injection: injected injected Figure 5–66: NEUTRAL IOC1 SCHEME LOGIC GE Multilin C70 Capacitor Bank Protection and Control System 5-159...
  • Page 284     (EQ 5.16) – The positive-sequence restraint allows for more sensitive settings by counterbalancing spurious zero-sequence currents resulting from: • System unbalances under heavy load conditions. 5-160 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 285 REV LA = 80° (reverse limit angle = the ± angular limit with the ECA for operation) The above bias should be taken into account when using the neutral directional overcurrent element to directionalize other protection elements. GE Multilin C70 Capacitor Bank Protection and Control System 5-161...
  • Page 286 NEUTRAL DIR OC1 POL VOLT: Selects the polarizing voltage used by the directional unit when "Voltage," "Dual," "Dual-V," or "Dual-I" polarizing mode is set. The polarizing voltage can be programmed to be either the zero-sequence 5-162 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 287 NEUTRAL DIR OC1 REV PICKUP: This setting defines the pickup level for the overcurrent unit of the element in the reverse direction. When selecting this setting it must be kept in mind that the design uses a positive-sequence restraint technique for the “Calculated 3I0” mode of operation. GE Multilin C70 Capacitor Bank Protection and Control System 5-163...
  • Page 288 Range: 0.001 to 5.000 pu in steps of 0.001 NTRL CUR UNBALCE 1 MESSAGE STG 1 PKP: 0.020 pu Range: 0.0 to 10.% in steps of 0.1 NTRL CUR UNBALCE 1 MESSAGE STG 1 SLOPE: 2.0% 5-164 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 289 By setting both the slope and the inherent unbalance compensating factor to zero one could apply the function as a plain overcurrent element responding to the split-phase neutral current. GE Multilin C70 Capacitor Bank Protection and Control System 5-165...
  • Page 290 NTRL CUR UNBALCE 1 K ANG: This setting defines angle of the factor compensating for the inherent unbalance of the bank. Under balanced conditions, the amount of the spill current measured in the neutral connection between the 5-166 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 291 At minimum this function shall be blocked when the two banks are not paralleled. Note that when unblocked, the function becomes operational after five cycles of intentional delay. High-set instantaneous protection on energization can be provided by a separate instantaneous overcurrent function. GE Multilin C70 Capacitor Bank Protection and Control System 5-167...
  • Page 292 5.6 GROUPED ELEMENTS 5 SETTINGS Figure 5–70: NEUTRAL CURRENT UNBALANCE SCHEME LOGIC 5-168 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 293: Ground Current

    MESSAGE  The C70 contains protection elements for ground time overcurrent (ANSI device 51G) and ground instantaneous overcur- rent (ANSI device 50G). A maximum of six ground time overcurrent and eight ground instantaneous overcurrent elements are available, dependent on the CT/VT modules ordered with the relay. See the following table for details.
  • Page 294 These elements measure the current that is connected to the ground channel of a CT/VT module. The conversion range of a standard channel is from 0.02 to 46 times the CT rating. NOTE Figure 5–71: GROUND TOC1 SCHEME LOGIC 5-170 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 295: Negative Sequence Current

     NEG SEQ DIR OC1 See page 5–172.  CURRENT   NEG SEQ DIR OC2 See page 5–172. MESSAGE  The C70 relay provides two (2) negative-sequence directional overcurrent elements.. GE Multilin C70 Capacitor Bank Protection and Control System 5-171...
  • Page 296 The positive-sequence restraint allows for more sensitive settings by counterbalancing spurious negative-sequence and zero-sequence currents resulting from: • System unbalances under heavy load conditions. • Transformation errors of current transformers (CTs). • Fault inception and switch-off transients. 5-172 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 297 CT errors, since the current is low. The operating quantity depends on the way the test currents are injected into the C70. For single phase injection: = ⅓  (1 – K  I •...
  • Page 298 The element characteristic angle in the reverse direction is the angle set for the forward direction shifted by 180°. • NEG SEQ DIR OC1 FWD LIMIT ANGLE: This setting defines a symmetrical (in both directions from the ECA) limit angle for the forward direction. 5-174 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 299 NEG SEQ DIR OC1 TYPE selecting this setting it must be kept in mind that the design uses a positive-sequence restraint technique. Figure 5–74: NEGATIVE SEQUENCE DIRECTIONAL OC1 SCHEME LOGIC GE Multilin C70 Capacitor Bank Protection and Control System 5-175...
  • Page 300: Voltage Elements

    Undervoltage Protection: For voltage sensitive loads, such as induction motors, a drop in voltage increases the drawn current which may cause dangerous overheating in the motor. The undervoltage protection feature can be used 5-176 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 301 V = secondary voltage applied to the relay = pickup level pickup % of voltage pickup 842788A1.CDR Figure 5–75: INVERSE TIME UNDERVOLTAGE CURVES At 0% of pickup, the operating time equals the UNDERVOLTAGE DELAY setting. NOTE GE Multilin C70 Capacitor Bank Protection and Control System 5-177...
  • Page 302 The minimum voltage setting selects the operating voltage below which the element is blocked (a setting of “0” will allow a dead source to be considered a fault condition). Figure 5–76: PHASE UNDERVOLTAGE1 SCHEME LOGIC 5-178 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 303 PHASE OV1 PKP 827066A7.CDR Figure 5–77: PHASE OVERVOLTAGE SCHEME LOGIC   If the source VT is wye-connected, then the phase overvoltage pickup condition is Pickup for V and V NOTE GE Multilin C70 Capacitor Bank Protection and Control System 5-179...
  • Page 304 NEUTRAL OV1 CURVE VT errors and normal voltage unbalance must be considered when setting this element. This function requires the VTs to be wye-connected. Figure 5–78: NEUTRAL OVERVOLTAGE1 SCHEME LOGIC 5-180 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 305 The negative-sequence overvoltage element may be used to detect loss of one or two phases of the source, a reversed phase sequence of voltage, or a non-symmetrical system voltage condition. Figure 5–79: NEGATIVE-SEQUENCE OVERVOLTAGE SCHEME LOGIC GE Multilin C70 Capacitor Bank Protection and Control System 5-181...
  • Page 306 AUX OV1 EVENTS: MESSAGE Disabled The C70 contains one auxiliary overvoltage element for each VT bank. This element is intended for monitoring overvoltage conditions of the auxiliary voltage. The nominal secondary voltage of the auxiliary voltage channel entered under SYSTEM ...
  • Page 307 Range: 0.00 to 600.00 s in steps of 0.01 VOLTAGE DIF 1 STG 1 MESSAGE PKP DELAY: 30.00 s Range: 0.00 to 600.00 s in steps of 0.01 VOLTAGE DIF 1 STG 2 MESSAGE PKP DELAY: 10.00 s GE Multilin C70 Capacitor Bank Protection and Control System 5-183...
  • Page 308 The function works with grounded and ungrounded banks. In the latter case, the neutral point voltage must be measured by the relay. For additional information, refer to the Theory of Operation and Application of Settings chapters. The following settings are available for each voltage differential element. 5-184 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 309 The VT fuse fail condition from both the bus and tap VT should also be considered. Note that when unblocked, the function becomes operational after five cycles of intentional delay. GE Multilin C70 Capacitor Bank Protection and Control System 5-185...
  • Page 310 Range: 1.00 to 10.00 in steps of 0.01 BANK OV 1 CURVE TIME MESSAGE MULTIPLIER: 1.00 Range: 0.800 to 2.000 pu in steps of 0.001 BANK OV 1 STG 1A MESSAGE PICKUP: 1.050 pu 5-186 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 311 GE Multilin C70 Capacitor Bank Protection and Control System 5-187...
  • Page 312 Vop_C = VC – VX Vop_C = (VBC – VCA) / 3 Delta Vop_A = (VCA – VAB) / 3 Vop_B = (VAB – VBC) / 3 Vop_C = (VBC – VCA) / 3 5-188 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 313 • BANK OV 1 BLK: This input is used to block the function when required; in particular, when the bank is offline. GE Multilin C70 Capacitor Bank Protection and Control System 5-189...
  • Page 314 Range: 0.0 to 10.0% in steps of 0.1 NTRL VOL UNBAL 1 MESSAGE STG 1 SLOPE: 0.0% Range: 0.001 to 1.000 pu in steps of 0.001 NTRL VOL UNBAL 1 MESSAGE STG 2 PKP: 0.020 pu 5-190 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 315 The slope of the operating characteristic is user adjustable, and if desired, it can be effectively removed yielding a straight compensated overvoltage function. For additional information refer to the Theory of operation and Application of settings chapters. GE Multilin C70 Capacitor Bank Protection and Control System 5-191...
  • Page 316 The value of resistor R should be chosen so the voltage measured by the auxiliary input of the relay matches bus V0 during system faults (for example, an SLG fault at the bus). This is accomplished by the following condition: 5-192 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 317 The function becomes blocked if all four blocking inputs are asserted. The individual blocking inputs inhibit the associated stages of the func- tion. GE Multilin C70 Capacitor Bank Protection and Control System 5-193...
  • Page 318 NTRL VOLT 1 STG4 OP t DPO FLEXLOGIC OPERANDS FLEXLOGIC OPERANDS NTRL VOLT 1 PKP NTRL VOLT 1 OP NTRL VOLT 1 DPO 834741A1.DWG Figure 5–86: NEUTRAL VOLTAGE UNBALANCE LOGIC 5-194 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 319: Control Elements

    If more than one operate-type operand is required, it may be assigned directly from the trip bus menu. GE Multilin C70 Capacitor Bank Protection and Control System 5-195...
  • Page 320 = Enabled TRIP BUS 1 BLOCK = Off SETTINGS TRIP BUS 1 LATCHING = Enabled TRIP BUS 1 RESET = Off FLEXLOGIC OPERAND RESET OP 842023A1.CDR Figure 5–88: TRIP BUS LOGIC 5-196 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 321: Setting Groups

    The setting groups menu controls the activation and deactivation of up to six possible groups of settings in the GROUPED settings menu. The faceplate Settings In Use LEDs indicate which active group (with a non-flashing energized ELEMENTS LED) is in service. GE Multilin C70 Capacitor Bank Protection and Control System 5-197...
  • Page 322 AND (3) = VIRT OP 1 (VO1) PHASE TOC1 PKP PHASE TOC2 PKP AND (3) = VIRT OP 1 (VO1) 842789A1.CDR Figure 5–89: EXAMPLE FLEXLOGIC CONTROL OF A SETTINGS GROUP 5-198 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 323: Selector Switch

    1 to the . If the control word is outside the range, an alarm is established SELECTOR FULL RANGE by setting the FlexLogic operand for 3 seconds. SELECTOR ALARM GE Multilin C70 Capacitor Bank Protection and Control System 5-199...
  • Page 324 SELECTOR 1 3BIT ACK: This setting specifies an acknowledging input for the three-bit control input. The pre- selected position is applied on the rising edge of the assigned FlexLogic operand. This setting is active only under the 5-200 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 325 The selector position pre-selected via the stepping up control input has not been confirmed before the time out. SELECTOR 1 BIT ALARM The selector position pre-selected via the three-bit control input has not been confirmed before the time out. GE Multilin C70 Capacitor Bank Protection and Control System 5-201...
  • Page 326 POS 1 POS 2 POS 3 POS 4 POS 5 POS 6 POS 7 BIT 0 BIT 1 BIT 2 STP ALARM BIT ALARM ALARM 842737A1.CDR Figure 5–90: TIME-OUT MODE 5-202 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 327 Make the following changes to selector switch element in the    SETTINGS CONTROL ELEMENTS SELECTOR SWITCH menu to assign control to user programmable pushbutton 1 and contact inputs 1 through 3: SELECTOR SWITCH 1 GE Multilin C70 Capacitor Bank Protection and Control System 5-203...
  • Page 328 SELECTOR 1 BIT ALARM 3-bit position out SELECTOR 1 ALARM SELECTOR 1 PWR ALARM SELECTOR 1 BIT 0 SELECTOR 1 BIT 1 SELECTOR 1 BIT 2 842012A2.CDR Figure 5–92: SELECTOR SWITCH LOGIC 5-204 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 329: Time Of Day Timers

    The time of day timer function provides the ability to program control actions based on real time. There are five identical time of day timers, each with an independent start and stop time setting. Each timer is on when the C70 real-time clock/cal- endar value is later than its programmed start time, and earlier than its programmed stop time.
  • Page 330: Capacitor Control

    CAP 1 LCL SET MAN: MESSAGE Range: FlexLogic operand CAP 1 TRIP 1: MESSAGE Range: FlexLogic operand CAP 1 TRIP 2: MESSAGE Range: FlexLogic operand CAP 1 TRIP 3: MESSAGE 5-206 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 331 CAP 1 BKR CLOSE BLK: MESSAGE Range: FlexLogic operand CAP 1 CLS OVERRIDE: MESSAGE Range: Self-reset, Latched, Disabled CAP 1 TARGETS: MESSAGE Disabled Range: Disabled, Enabled CAP 1 EVENTS: MESSAGE Disabled GE Multilin C70 Capacitor Bank Protection and Control System 5-207...
  • Page 332 CAP 1 BKR OPEN 52b: Selects a FlexLogic operand that cancels the trip seal-in. Expected to be set to the contact input to which a contact is wired that is closed when the capacitor breaker is open. When both 52a and 52b contacts 5-208 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 333 CAP 1 CLS OVERRIDE: Selects a FlexLogic operand that overrides all inhibits for the breaker close command and allows the command to be issued from any source as per the logic diagram. CLOSE GE Multilin C70 Capacitor Bank Protection and Control System 5-209...
  • Page 334 Off = 0 CAP 1 AUTO CLOSE OFF = 0 SETTINGS CAP 1 CLOSE SEAL-IN DELAY FLEXLOGIC OPERAND CAP 1 BKR CLOSE 834740A1.DWG Figure 5–96: CAPACITOR BANK CONTROL SCHEME LOGIC 5-210 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 335: Automatic Voltage Regulator

    The automatic voltage regulator element (AVR) is intended to switch a static capacitor bank breaker close and open to reg- ulate either system voltage, load voltage, power factor, or reactive power. The following figure illustrates some possible applications. GE Multilin C70 Capacitor Bank Protection and Control System 5-211...
  • Page 336 For the latter preference, set the var open mode to “Minimize No. of Ops” (minimize number of operations) and set the var open level to the negative of the close level. 5-212 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 337 AVRs facilitates coordination with those AVRs. • AVR 1 VOLT LEVEL TO CLOSE: In the voltage mode, this setting specifies the voltage level at or below which to issue the close command. GE Multilin C70 Capacitor Bank Protection and Control System 5-213...
  • Page 338 • AVR 1 BLOCK: This setting specifies a dynamic blocking condition. When blocked the element resets its output flags and internal timers. VT fuse fail is a typical application. 5-214 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 339 AVR 1 OPEN DPO SETTING see note at right VAR Open Mode Minimize No. of Ops. = 0 Minimize Uptime = 1 834739A2.CDR Figure 5–100: AUTOMATIC VOLTAGE REGULATOR SCHEME LOGIC GE Multilin C70 Capacitor Bank Protection and Control System 5-215...
  • Page 340: Digital Elements

    Some versions of the digital input modules include an active voltage monitor circuit connected across form-A contacts. The voltage monitor circuit limits the trickle current through the output circuit (see technical specifications for form-A). 5-216 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 341 The settings to use digital element 1 to monitor the breaker trip circuit are indicated below (EnerVista UR Setup example shown): The PICKUP DELAY setting should be greater than the operating time of the breaker to avoid nuisance alarms. NOTE GE Multilin C70 Capacitor Bank Protection and Control System 5-217...
  • Page 342 “Off”. In this case, the settings are as follows (EnerVista UR Setup example shown). Figure 5–103: TRIP CIRCUIT EXAMPLE 2 The wiring connection for two examples above is applicable to both form-A contacts with voltage monitoring and solid-state contact with voltage monitoring. NOTE 5-218 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 343: Digital Counters

    –2,147,483,648 counts, the counter will rollover to +2,147,483,647. • COUNTER 1 BLOCK: Selects the FlexLogic operand for blocking the counting operation. All counter operands are blocked. GE Multilin C70 Capacitor Bank Protection and Control System 5-219...
  • Page 344 COUNTER 1 FROZEN: Off = 0 STORE DATE & TIME Date & Time SETTING COUNT1 FREEZE/RESET: Off = 0 827065A1.VSD SETTING COUNT1 FREEZE/COUNT: Off = 0 Figure 5–104: DIGITAL COUNTER SCHEME LOGIC 5-220 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 345: Monitoring Elements

      VT FUSE FAILURE 5 See page 5–228. MESSAGE   VT FUSE FAILURE 6 See page 5–228. MESSAGE   THERMAL OVERLOAD See page 5–230. MESSAGE  PROTECTION GE Multilin C70 Capacitor Bank Protection and Control System 5-221...
  • Page 346 Voltage difference drop, and Measured flashover current through the breaker. Furthermore, the scheme is applicable for cases where either one or two sets of three-phase voltages are available across the breaker. 5-222 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 347 This application does not require detection of breaker status via a 52a contact, as it uses a voltage difference larger than setting. However, monitoring the breaker contact will ensure scheme stability. BRK 1 FLSHOVR DIFF V PKP GE Multilin C70 Capacitor Bank Protection and Control System 5-223...
  • Page 348 BRK 1 FLSHOVR SPV A to BRK 1 FLSHOVR SPV C: These settings specify FlexLogic operands (per breaker pole) that supervise the operation of the element per phase. Supervision can be provided by operation of other protection 5-224 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 349 BRK 1 FLSHOVR DIFF V SRC: PKP: SRC 1 SRC 2 SRC 6 , … , , none ΔVA > PKP Δ VA = VA - Va 842018A2.CDR Figure 5–105: BREAKER FLASHOVER SCHEME LOGIC GE Multilin C70 Capacitor Bank Protection and Control System 5-225...
  • Page 350 MESSAGE EVENTS: Disabled One breaker restrike element is provided for each CT/VT module in the C70. According to IEEE standard C37.100: IEEE Standard Definitions for Power Switchgear, restrike is defined as “a resumption of current between the contacts of a switching device during an opening operation after an interval of zero current of ¼...
  • Page 351 “1” when breaker is opened, either manually or from protection logic. • BRK RSTR 1 CLS CMD: This setting assigns a FlexLogic operand indicating a breaker close command. It must be logic “1” when breaker is closed. GE Multilin C70 Capacitor Bank Protection and Control System 5-227...
  • Page 352 VT neutral wire open detection function. When the VT NEU WIRE OPEN 1 FUNCTION VT is connected in Delta, do not enabled this function because there is no neutral wire for Delta connected VT. 5-228 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 353 Figure 5–109: VT FUSE FAIL SCHEME LOGIC Base voltage for this element is PHASE VT SECONDARY setting in the case of WYE VTs and (PHASE VT SECONDARY)/ in case of DELTA VTs. GE Multilin C70 Capacitor Bank Protection and Control System 5-229...
  • Page 354 = measured load RMS current before overload occurs. • k= IEC 255-8 k-factor applied to I , defining maximum permissible current above nominal current. • = protected element base (nominal) current. 5-230 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 355 (EQ 5.23) –   op In When current is less than the dropout level, I > 0.97 × k × I , the element starts decreasing the thermal energy: GE Multilin C70 Capacitor Bank Protection and Control System 5-231...
  • Page 356 60 minutes 20 minutes Underground cable 20 to 60 minutes 60 minutes The logic for the thermal overload protection element is shown below. Figure 5–111: THERMAL OVERLOAD PROTECTION SCHEME LOGIC 5-232 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 357: Inputs And Outputs

    The DC input voltage is compared to a user-settable threshold. A new contact input state must be maintained for a user- settable debounce time in order for the C70 to validate the new contact state. In the figure below, the debounce time is set at 2.5 ms;...
  • Page 358 "Breaker Closed (52b)" CONTACT INPUT H5A ID: "Enabled" CONTACT INPUT H5A EVENTS: Note that the 52b contact is closed when the breaker is open and open when the breaker is closed. 5-234 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 359: Virtual Inputs

    FlexLogic equation, it will likely have to be lengthened NOTE in time. A FlexLogic timer with a delayed reset can perform this function. Figure 5–113: VIRTUAL INPUTS SCHEME LOGIC GE Multilin C70 Capacitor Bank Protection and Control System 5-235...
  • Page 360: Contact Outputs

    The most dependable protection of the initiating contact is provided by directly measuring current in the tripping circuit, and using this parameter to control resetting of the initiating relay. This scheme is often called trip seal-in. This can be realized in the C70 using the FlexLogic operand to seal-in the contact output as follows: CONT OP 1 ION “Cont Op 1"...
  • Page 361 5.8 INPUTS AND OUTPUTS The C70 latching output contacts are mechanically bi-stable and controlled by two separate (open and close) coils. As such they retain their position even if the relay is not powered up. The relay recognizes all latching output contact cards and pop- ulates the setting menu accordingly.
  • Page 362: Virtual Outputs

    Logic equations. Any change of state of a virtual output can be logged as an event if programmed to do so. For example, if Virtual Output 1 is the trip signal from FlexLogic and the trip relay is used to signal events, the settings would be programmed as follows: 5-238 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 363: Remote Devices

    The remote input/output facility provides for 32 remote inputs and 64 remote outputs. b) LOCAL DEVICES: ID OF DEVICE FOR TRANSMITTING GSSE MESSAGES In a C70 relay, the device ID that represents the IEC 61850 GOOSE application ID (GoID) name string sent as part of each GOOSE message is programmed in the ...
  • Page 364: Remote Inputs

    This setting identifies the Ethernet application identification in the GOOSE message. It should match the corre- sponding settings on the sending device. setting provides for the choice of the C70 fixed (DNA/UserSt) dataset (that is, containing REMOTE DEVICE 1 DATASET DNA and UserSt bit pairs), or one of the configurable datasets.
  • Page 365: Remote Double-Point Status Inputs

    REMOTE OUTPUTS DNA BIT PAIRS REMOTE OUTPUTS DNA- 1(32) BIT PAIR Range: FlexLogic operand  REMOTE OUTPUTS DNA- 1 OPERAND:  DNA- 1 BIT PAIR Range: Disabled, Enabled DNA- 1 EVENTS: MESSAGE Disabled GE Multilin C70 Capacitor Bank Protection and Control System 5-241...
  • Page 366: Resetting

    The setting RESET OP (PUSHBUTTON) RESET OP (COMMS) RESET OP (OPERAND) shown above selects the operand that will create the operand. RESET OP (OPERAND) 5-242 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 367: Direct Inputs And Outputs

    APPLICATION EXAMPLES The examples introduced in the earlier Direct inputs and outputs section (part of the Product Setup section) are continued below to illustrate usage of the direct inputs and outputs. GE Multilin C70 Capacitor Bank Protection and Control System 5-243...
  • Page 368 5.8 INPUTS AND OUTPUTS 5 SETTINGS Example 1: Extending input/output capabilities of a C70 relay Consider an application that requires additional quantities of digital inputs or output contacts or lines of programmable logic that exceed the capabilities of a single UR-series chassis. The problem is solved by adding an extra UR-series IED, such as the C30, to satisfy the additional inputs/outputs and programmable logic requirements.
  • Page 369 DIRECT INPUT 6 BIT NUMBER: UR IED 2: "1" DIRECT INPUT 5 DEVICE ID: "2" DIRECT INPUT 5 BIT NUMBER: "3" DIRECT INPUT 6 DEVICE ID: "2" DIRECT INPUT 6 BIT NUMBER: GE Multilin C70 Capacitor Bank Protection and Control System 5-245...
  • Page 370: Iec 61850 Goose Analogs

    GOOSE ANALOG 1 PU: This setting specifies the per-unit base factor when using the GOOSE analog input FlexAna- log values in other C70 features, such as FlexElements. The base factor is applied to the GOOSE analog input Flex- Analog quantity to normalize it to a per-unit quantity. The base units are described in the following table.
  • Page 371: Iec 61850 Goose Integers

    SOURCE VOLTAGE = maximum nominal primary RMS value of the +IN and –IN inputs BASE The GOOSE analog input FlexAnalog values are available for use in other C70 functions that use FlexAnalog values. 5.8.12 IEC 61850 GOOSE INTEGERS  ...
  • Page 372: Transducer Inputs And Outputs

    –20 to +180 MW; in this case the value would be “–20” and the DCMA INPUT F1 MIN VALUE DCMA INPUT F1 MAX value “180”. Intermediate values between the min and max values are scaled linearly. VALUE 5-248 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 373: Rtd Inputs

    1.5 pu. FlexElement operands are available to FlexLogic for further interlocking or to operate an output contact directly. Refer to the following table for reference temperature values for each RTD type. GE Multilin C70 Capacitor Bank Protection and Control System 5-249...
  • Page 374 233.97 16.00 172.46 291.96 243.30 16.39 175.84 303.46 252.88 16.78 179.51 315.31 262.76 17.17 183.17 327.54 272.94 17.56 186.82 340.14 283.45 17.95 190.45 353.14 294.28 18.34 194.08 366.53 305.44 18.73 5-250 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 375: Dcma Outputs

    MAX VAL MIN VAL MAX VAL < 0.1 pu. The resulting characteristic is illustrated in the following figure. DRIVING SIGNAL MIN VAL MAX VAL 842739A1.CDR Figure 5–119: DCMA OUTPUT CHARACTERISTIC GE Multilin C70 Capacitor Bank Protection and Control System 5-251...
  • Page 376 The CT ratio is 5000:5 and the maximum load current is 4200 A. The current should be monitored from 0 A upwards, allow- ing for 50% overload. The phase current with the 50% overload margin is: 5-252 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 377 – • ±0.5% of reading For example, under nominal conditions, the positive-sequence reads 230.94 kV and the worst-case error is 0.005 x 230.94 kV + 1.27 kV = 2.42 kV. GE Multilin C70 Capacitor Bank Protection and Control System 5-253...
  • Page 378: Testing

    TEST MODE FORCING: MESSAGE The C70 provides a test facility to verify the functionality of contact inputs and outputs, some communication channels and the phasor measurement unit (where applicable), using simulated conditions. The test mode is indicated on the relay face- plate by a Test Mode LED indicator.
  • Page 379: Force Contact Inputs

    Following a restart, power up, settings TEST MODE FUNCTION upload, or firmware upgrade, the test mode will remain at the last programmed value. This allows a C70 that has been placed in isolated mode to remain isolated during testing and maintenance activities. On restart, the TEST MODE FORCING setting and the force contact input and force contact output settings all revert to their default states.
  • Page 380: Force Contact Outputs

    1 to initiate the Test mode, make the following changes in the menu:   SETTINGS TESTING TEST MODE “Enabled” and “ ” TEST MODE FUNCTION: TEST MODE INITIATE: 5-256 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 381: Actual Values

     GOOSE UINTEGERS  COMM STATUS See page 6-9.  REMAINING CONNECT  PRP See page 6-10.   ACTUAL VALUES  SOURCE SRC 1 See page 6-14.  METERING  GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 382 See page 6-22.   DATA LOGGER See page 6-23.   ACTUAL VALUES  MODEL INFORMATION See page 6-24.  PRODUCT INFO   FIRMWARE REVISIONS See page 6-24.  C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 383: Contact Inputs

    The state displayed will be that of the remote point unless the remote device has been established to be “Offline” in which case the value shown is the programmed default state for the remote input. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 384: Remote Double-Point Status Inputs

    For example, ‘Virt Op 1’ refers to the virtual output in terms of the default name-array index. The second line of the display indicates the logic state of the virtual output, as calculated by the FlexLogic equation for that output. C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 385: Remote Devices

    (the count units label will also appear). Also included, is the date and time stamp for the frozen count. The value refers to the microsecond portion of the time stamp. COUNTER 1 MICROS GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 386: Selector Switches

    STATUS ETHERNET Range: Fail, OK  ETHERNET ETHERNET PRI LINK  STATUS: Fail Range: Fail, OK ETHERNET SEC LINK MESSAGE STATUS: Fail Range: Fail, OK ETHERNET TRD LINK MESSAGE STATUS: Fail C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 387: Real Time Clock Synchronizing

    PTP-— IRIG-B DELTA being received via PTP and that being received via IRIG-B. A positive value indicates that PTP time is fast compared to IRIG-B time. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 388: Direct Inputs

    Range: Offline, Online DIRECT DEVICE 2 MESSAGE STATUS: Offline  Range: Offline, Online DIRECT DEVICE 16 MESSAGE STATUS: Offline These actual values represent the state of direct devices 1 through 16. C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 389: Iec 61850 Goose Integers

    UINT INPUT 16 MESSAGE The C70 Capacitor Bank Protection and Control System is provided with optional IEC 61850 communica- tions capability. This feature is specified as a software option at the time of ordering. Refer to the Ordering section of chapter 2 for additional details.
  • Page 390: Parallel Redundancy Protocol (Prp)

    Port B (PRP frame, but port received through MISMATCHES PORT B and LAN ID in the frame do not match). 6-10 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 391: Metering Conventions

    WATTS = Negative VARS = Positive PF = Lead PF = Lag PF = Lead Current UR RELAY 827239AC.CDR S=VI Generator Figure 6–1: FLOW DIRECTION OF SIGNED VALUES FOR WATTS AND VARS GE Multilin C70 Capacitor Bank Protection and Control System 6-11...
  • Page 392   -- - V   -- - V   -- - V   -- - V   The above equations apply to currents as well. 6-12 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 393 The power system voltages are phase-referenced – for simplicity – to VAG and VAB, respectively. This, however, is a relative matter. It is important to remember that the C70 displays are always referenced as specified under SETTINGS ...
  • Page 394: Sources

    MESSAGE 0.000 SRC 1 PHASOR Ia: MESSAGE 0.000 0.0° SRC 1 PHASOR Ib: MESSAGE 0.000 0.0° SRC 1 PHASOR Ic: MESSAGE 0.000 0.0° SRC 1 PHASOR In: MESSAGE 0.000 0.0° 6-14 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 395 RMS Vab: MESSAGE 0.00 SRC 1 RMS Vbc: MESSAGE 0.00 SRC 1 RMS Vca: MESSAGE 0.00 SRC 1 PHASOR Vab: MESSAGE 0.000 0.0° SRC 1 PHASOR Vbc: MESSAGE 0.000 0.0° GE Multilin C70 Capacitor Bank Protection and Control System 6-15...
  • Page 396 b: 0.000 SRC 1 REACTIVE PWR MESSAGE c: 0.000 SRC 1 APPARENT PWR MESSAGE 3: 0.000 SRC 1 APPARENT PWR MESSAGE a: 0.000 SRC 1 APPARENT PWR MESSAGE b: 0.000 6-16 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 397 (see   ). Current SETTINGS SYSTEM SETUP SIGNAL SOURCES harmonics are measured for each source for the total harmonic distortion (THD) and 2nd to 25th harmonics per phase. GE Multilin C70 Capacitor Bank Protection and Control System 6-17...
  • Page 398: Capacitor Control

    MESSAGE CAP 3 DISCHARGE TIME: MESSAGE CAP 4 DISCHARGE TIME: MESSAGE These values indicate the time remaining before the next permissible close operation for each of the four capacitor banks. 6-18 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 399: Capacitor Bank

     UNBALANCE 1 Cm Iop A: 0.0000 pu Raw Id B: 0.0000 pu MESSAGE Cm Iop B: 0.0000 pu Raw Id C: 0.0000 pu MESSAGE Cm Iop C: 0.0000 pu GE Multilin C70 Capacitor Bank Protection and Control System 6-19...
  • Page 400: Tracking Frequency

    +IN and –IN inputs BASE BASE BASE SOURCE THD & HARMONICS BASE = 1% SOURCE VOLTAGE = maximum nominal primary RMS value of the +IN and –IN inputs BASE 6-20 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 401: Iec 61580 Goose Analog Values

    MESSAGE 0.000 The C70 Capacitor Bank Protection and Control System is provided with optional IEC 61850 communica- tions capability. This feature is specified as a software option at the time of ordering. Refer to the Ordering section of chapter 2 for additional details.
  • Page 402: User-Programmable Fault Reports

    A trigger can be forced here at any time by setting “Yes” to the command. Refer to the  FORCE TRIGGER? COMMANDS menu for information on clearing the oscillography records. CLEAR RECORDS 6-22 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 403: Data Logger

    It counts up at the defined sampling rate. If the data logger channels are defined, then both values are static. Refer to the  menu for clearing data logger records. COMMANDS CLEAR RECORDS GE Multilin C70 Capacitor Bank Protection and Control System 6-23...
  • Page 404: Model Information

    Date and time when the boot program was built. 2004/09/15 16:41:32 The shown data is illustrative only. A modification file number of 0 indicates that, currently, no modifications have been installed. 6-24 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 405: Capacitor Bank Automatic Settings

    If applied from this command level, a given value is placed into the setting file and applied instanta- neously in all setting groups of the relay with the same source as the active group during the auto-setting procedure. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 406 “Auto” to “Disabled” and 87V becomes operational. In essence, when in the “Auto” mode, the user confirmation is processed immediately after the balancing values become available. The C70 does not display the applied coefficients in “Auto” mode; rather, they are be viewed under in the menu.
  • Page 407 After the process if finished, it is recommended to disable the auto-setting feature. If not manually disabled, the feature automatically disables itself when user-initiated front panel interface activity ceases and the C70 display is dimmed. Certain security conditions are checked during the auto-setting process, such as the deviation from the nominal frequency and the magnitude of the phase voltages within 0.85 pu and 1.15 pu.
  • Page 408 “Auto” to “Disabled” and the 60P element becomes operational. When in the “Auto” mode, the automatic confirmation command is executed immediately after the balancing values are available. The C70 does not display the applied coefficients in “Auto” mode; rather, they can be viewed in the menu.
  • Page 409 “Auto” to “Disabled”, and the 60N element becomes operational. In essence, the when in the “Auto” mode, the confirmation command is automatically executed immediately after the balancing values become available. The C70 does not display the applied coefficients in the “Auto” mode; instead, they may be viewed in the menu.
  • Page 410: Virtual Inputs

    ENTER key is clicked. The timescale of the entered time should be local time, including daylight time where and when applicable. C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 411: Relay Maintenance

    Various self-checking diagnostics are performed in the background while the C70 is running, and diagnostic information is stored on the non-volatile memory from time to time based on the self-checking result. Although the diagnostic information is cleared before the C70 is shipped from the factory, the user may want to clear the diagnostic information for themselves under certain circumstances.
  • Page 412 Operator Logoff: Selecting ‘Yes’ allows the Supervisor to forcefully logoff an operator session. • Clear Security Data: Selecting ‘Yes’ allows the Supervisor to forcefully clear all the security logs and clears all the operands associated with the self-tests. C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 413: Targets Menu

    • All other output relays are de-energized and are prevented from further operation. • The faceplate In Service LED indicator is turned off. • event is recorded. RELAY OUT OF SERVICE GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 414 Contact Factory (xxx) • Latched target message: Yes. • Description of problem: One or more installed hardware modules is not compatible with the C70 order code. • How often the test is performed: Module dependent. • What to do: Contact the factory and supply the failure code noted in the display. The “xxx” text identifies the failed mod- ule (for example, F8L).
  • Page 415 • What to do: Verify that all the items in the GOOSE data set are supported by the C70. The EnerVista UR Setup soft- ware will list the valid items. An IEC61850 client will also show which nodes are available for the C70.
  • Page 416 How often the test is performed: Upon initiation of a contact output state change. • What to do: Verify the state of the output contact and contact the factory if the problem persists. 7-12 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 417 Description of problem: The ambient temperature is greater than the maximum operating temperature (+80°C). • How often the test is performed: Every hour. • What to do: Remove the C70 from service and install in a location that meets operating temperature standards. UNEXPECTED RESTART: Press “RESET” key •...
  • Page 418 If this message appears, contact the factory and supply the failure code noted in the display. Text in the message identifies the failed module (for example, H81). If operated on a Process Card failure, the Module Fail self-test seals-in (latches) till the UR-series device is restarted. 7-14 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 419 Brick output failing to respond to an output command can only be detected while the command is active, and so in this case the target is latched. A latched target can be unlatched by pressing the faceplate reset key if the command has ended, however the output may still be non-functional. GE Multilin C70 Capacitor Bank Protection and Control System 7-15...
  • Page 420 7.2 TARGETS 7 COMMANDS AND TARGETS 7-16 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 421: General Operation

    However, this approach is seldom economic due to the large number of voltage transducers required. Thus, the C70 supports various other methods, the suitability of each dependant on the capacitor bank configuration, and on the VTs and CTs available.
  • Page 422 However, as shown immediately above, string voltages can be determined for an ungrounded balanced bank using only phase-to-phase bus voltages. In the case of a grounded bank, we can calculate that the A-string voltage is: C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 423: Voltage Differential (Ansi 87V)

    8.8 is implemented using primary voltage phasors. The protection operates when the operate signal is greater than the set pickup level for the set pickup delay. Identical relations apply to phases B and C. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 424 (EQ 8.15)     OP 1A OP 1A This can be written as:         (EQ 8.16)   OP 1A C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 425 V can be taken as 1 when the system is normal (not faulted). Note however that under external fault conditions sensitivity may be much different from the non-fault sensitivity. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 426: Compensated Bank Neutral Voltage Unbalance (Ansi 59Nu)

    Commands chapter. The C70 sets the operate sig- nal to zero in equation 8.7 or 8.8 and solves for the match factor k using the average of several successive voltage mea- surements.
  • Page 427 The unbalance ratio k-values that reflect the initial or inherent bank unbalance are chosen as: ------ - , k ------- (EQ 8.31) Therefore, as seen from the previous two equations, the initial operating signal will be zero. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 428      For our purposes, , so . This results in: –  ---------- - V -- - ------------------- - (EQ 8.38) -- -  -------  – C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 429 8.25 to zero and solve for the unbalance ratio k- values using the average of several successive measurements of the voltages. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 430: Phase Current Unbalance (Ansi 60P)

    Sensitivity is the key performance parameter. The applied comparator uses a simple integration method in addition to the standard hysteresis approach, to deal with chattering of the operating signal at the boundary of operation. 8-10 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 431 CT primary current rating. This places the string currents on the base same per-unit base used by the C70. Voltages are expressed in primary volts, capacitances in Farads, and frequency in radians per second. The differential current is the vector difference between the two currents: –...
  • Page 432: Neutral Current Unbalance (Ansi 60N)

    However, with the two banks slightly mis-matched due to manu- facturing tolerances, a circulating zero-sequence current may be present. Compensation for this inherent unbalance cur- rent is available to increase the sensitivity of the function. 8-12 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 433 BALANCED CASE The currents in the neutral current unbalance protection are driven by the individual admittances in each string: GE Multilin C70 Capacitor Bank Protection and Control System 8-13...
  • Page 434      (EQ 8.62) a ˆ a ˆ k a ˆ k a ˆ       Substituting this into equation 8.54, we get: 8-14 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 435 I converted to the differential source base. For example, I , where I rated rated base base is again the differential CT primary current rating, or with system normal: GE Multilin C70 Capacitor Bank Protection and Control System 8-15...
  • Page 436 8.58 through 8.65. This results in the following changes. Equation 8.64 becomes: a ˆ a ˆ k (EQ 8.69) a ˆ a ˆ -------------------------- - -------------------------- - -------------------------- - Equation 8.65 becomes: 8-16 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 437 In this situation, the base for C(pu) is the capacitance of the string which has the element failure, so the larger bank will have a lower sensitivity than the smaller bank. GE Multilin C70 Capacitor Bank Protection and Control System 8-17...
  • Page 438 8.1 OVERVIEW 8 THEORY OF OPERATION 8-18 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 439: Externally Fused Capacitors

    The capacitor units are built larger because the entire unit is not expected to fail. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 440: Fuseless Capacitors

    This design does not require as many capacitor units in parallel as an externally fused bank. C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 441: Grounded Wye-Connected Banks

    As long as no fuses have opened and no elements have shorted, the ratio of these two voltages will remain constant. The ratio changes with any capacitor failure in the phase, providing sensitive protection. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 442: Summary

    The following figure summarizes the grounded wye, ungrounded wye, delta, H-bridge, and tapped connection types for capacitor banks. Grounded wye Ungrounded wye Delta H-bridge Tapped 834756A1.CDR Figure 9–4: CAPACITOR BANK CONNECTIONS C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 443: Description

    Capacitor unbalance protection is provided in many different ways, depending on the capacitor bank arrangement. The variety of unbalance protection schemes that may be applied with C70 for internally fused, externally fused, fuseless, or unfused shunt capacitor banks is indicated in Theory of operation chapter and is illustrated on the figures below.
  • Page 444 The following figure illustrates a single capacitor bank, ungrounded, with a tap. In this case, two CT/VT modules are required. C70 CAPACITOR BANK RELAY 59NU 834758A1.CDR Figure 9–6: SINGLE BANK, UNGROUNDED, WITH A TAP C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 445 The following figure illustrates parallel capacitor banks, ungrounded, no tap available, and with current unbalance protec- tion. In this case, two CT/VT modules are required. C70 CAPACITOR BANK RELAY 59NU 834760A1.CDR Figure 9–8: PARALLEL BANKS, UNGROUNDED, NO TAP AVAILABLE, CURRENT UNBALANCE PROTECTION GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 446 CTs for each bank. In this case, two CT/VT modules are required. C70 CAPACITOR BANK RELAY 834762A1.CDR Figure 9–10: PARALLEL BANKS, GROUNDED, NO TAP, WITH CURRENT BALANCE PROTECTION AND HIGH-SIDE CTS C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 447 (ground fault), a delay slightly longer than the upstream protection fault clearing time is required to avoid tripping due to a system fault. Longer delays increase the probability of catastrophic bank failure. GE Multilin C70 Capacitor Bank Protection and Control System...
  • Page 448: Protection For Rack Faults

    To avoid nuisance tripping during transient overvoltage conditions, in some cases, tripping is delayed by a timer. The C70 relay provides inverse time overvoltage characteristics required to decrease tripping time for large overvoltages.
  • Page 449: Overcurrent

    Because this tripping is also not due to a fault within the capacitor bank (like system overvoltage tripping), the bank is not locked out. GE Multilin C70 Capacitor Bank Protection and Control System 9-11...
  • Page 450: Description

    Figure 9–12: SAMPLE CAPACITOR BANK CONFIGURATION Based on the bank configuration, CT connections, and VTs connections, a C70 model is chosen with three CT/VT mod- ules: two type 8L modules (in slots F and U) and one type 8V module (in slot M) to provide following protection functionality.
  • Page 451: Vt And Ct Setup

    Where the VT ratio N is calculated as: tap(VT) 125 kV ------------------- - (EQ 9.4)   tap VT 0.25 kV The following settings are applied in the EnerVista UR Setup software. GE Multilin C70 Capacitor Bank Protection and Control System 9-13...
  • Page 452: Source Assignment

    The maximum rated phase current of the healthy bank: 81515.37 V ------------- - --------------------------------- - 86.06 A (EQ 9.11) 1894.92 2  2  The maximum rated voltage across the healthy top section: 9-14 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 453 – – unbal   1845.33 50 1890.34   The following table summarizes the calculated values for the number of failed capacitors used to set the protection ele- ments. GE Multilin C70 Capacitor Bank Protection and Control System 9-15...
  • Page 454: Bank Voltage Differential Settings

    An 87V-2 differential element measuring the differential voltage between the upper capacitor string and bottom capaci- tor can for string 1. • An 87V-3 differential element measuring the differential voltage between the upper capacitor string and bottom capaci- tor can for string 2. 9-16 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 455 VTs. These VTs must be blocked if one or both of them has a VT fuse failure condition. There- fore, as shown in the following figure, a blocking input for each element is created with FlexLogic™. GE Multilin C70 Capacitor Bank Protection and Control System 9-17...
  • Page 456: Bank Phase Current Unbalance Settings

    The pickup setting for the stage 1 phase current unbalance alarm element is programmed for one element failure.  60P alarm 0.9I 0.9 0.0209 pu 0.019 pu (EQ 9.25)   unbal f1_max 9-18 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 457: Bank Phase Overvoltage Settings

     59B pickup (stage 1) 1.25 1.125 pu  59B pickup (stage 2) 0.9 1.5 1.35 pu (EQ 9.27)  59B pickup (stage 3) 1.80 pu GE Multilin C70 Capacitor Bank Protection and Control System 9-19...
  • Page 458: Bank Phase Undervoltage Settings

    0.7 pu with a time delay of 1 second, based on maximum fault clearing time. The bank undervoltage element is blocked during VT fuse fail conditions. The following setting values are programmed in the EnerVista UR Setup software. 9-20 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 459: Bank Overcurrent Protection

    10% of the nominal bank phase current with a delay of 250 to 400 ms typically pro- vides adequate coordination for faults external to the bank and protection for internal rack faults. GE Multilin C70 Capacitor Bank Protection and Control System 9-21...
  • Page 460 9.4 SETTING EXAMPLE 9 APPLICATION OF SETTINGS 9-22 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 461: Ge Multilin C70 Capacitor Bank Protection And Control System

    The enhanced faceplate can be opened to the left, once the thumb screw has been removed, as shown below. This allows for easy accessibility of the modules for withdrawal. The new wide-angle hinge assembly in the enhanced front panel opens completely and allows easy access to all modules in the C70. 842812A1.CDR Figure 10–1: UR MODULE WITHDRAWAL AND INSERTION (ENHANCED FACEPLATE)
  • Page 462 When the clips have locked into position, the module will be fully inserted. CPU connections must be individually disconnected from the module before the module can be removed from the chassis. NOTE NOTE 10-2 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 463: Replace Battery

    10. Reinstall the battery clip and the metal cover, and reinsert the power supply module into the unit. 11. Power on the unit. 12. Dispose of the old battery as outlined in the next section. GE Multilin C70 Capacitor Bank Protection and Control System 10-3...
  • Page 464: Dispose Of Battery

    La batterie est marqué de ce symbole, qui comprennent les indications cadmium (Cd), plomb (Pb), ou mercure (Hg). Pour le recyclage, retourner la batterie à votre fournisseur ou à un point de collecte. Pour plus d'informations, voir: www.recyclethis.info. 10-4 C70 Capacitor Bank Protection and Control System GE Multilin...
  • Page 465 Baterija je označena s tem simbolom, ki lahko vključuje napise, ki označujejo kadmij (Cd), svinec (Pb) ali živo srebro (Hg). Za ustrezno recikliranje baterijo vrnite dobavitelju ali jo odstranite na določenem zbirališču. Za več informacij obiš