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GE UR Series Instruction Manual

Line differential relay.
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GE Power Management
L90 Line Differential Relay
UR Series Instruction Manual
L90 Revision: 2.9X
Manual P/N: 1601-0081-B5 (GEK-106231B)
Copyright © 2001 GE Power Management
GE Power Management
215 Anderson Avenue, Markham, Ontario
Canada L6E 1B3
Tel: (905) 294-6222 Fax: (905) 294-8512
Internet: http://www.GEindustrial.com/pm
Manufactured under an
ISO9000 Registered system.

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Table of Contents

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   Summary of Contents for GE UR Series

  • Page 1 GE Power Management L90 Line Differential Relay UR Series Instruction Manual L90 Revision: 2.9X Manual P/N: 1601-0081-B5 (GEK-106231B) Copyright © 2001 GE Power Management GE Power Management 215 Anderson Avenue, Markham, Ontario Canada L6E 1B3 Tel: (905) 294-6222 Fax: (905) 294-8512 Internet: http://www.GEindustrial.com/pm...
  • Page 3 GE Power Management ADDENDUM This Addendum contains information that relates to the L90 relay, version 2.9X. This addendum lists a number of information items that appear in the instruction manual GEK-106231B (1601-0081-B5) but are not included in the cur- rent L90 operations.
  • Page 5: Table Of Contents

    LOCAL USER INTERFACE ................2-11 2.5.3 TIME SYNCHRONIZATION ................2-11 2.5.4 FUNCTION DIAGRAMS .................. 2-11 2.6 TECHNICAL SPECIFICATIONS 2.6.1 PROTECTION ELEMENTS ................2-13 2.6.2 USER PROGRAMMABLE ELEMENTS ............2-16 2.6.3 MONITORING ....................2-16 2.6.4 METERING ...................... 2-17 GE Power Management L90 Line Differential Relay...
  • Page 6 BREAKER CONTROL ..................4-9 4.2.8 MENUS ......................4-10 4.2.9 CHANGING SETTINGS ...................4-11 5. SETTINGS 5.1 OVERVIEW 5.1.1 SETTINGS MAIN MENU ..................5-1 5.1.2 INTRODUCTION TO ELEMENTS ..............5-3 5.1.3 INTRODUCTION TO AC SOURCES..............5-4 5.2 PRODUCT SETUP 5.2.1 PASSWORD SECURITY..................5-7 L90 Line Differential Relay GE Power Management...
  • Page 7 BREAKER ARCING CURRENT ..............5-142 5.6.9 CONTINUOUS MONITOR ................5-144 5.6.10 CT FAILURE DETECTOR ................5-145 5.6.11 VT FUSE FAILURE ..................5-147 5.6.12 PILOT SCHEMES ..................5-148 5.7 INPUTS / OUTPUTS 5.7.1 CONTACT INPUTS..................5-151 GE Power Management L90 Line Differential Relay...
  • Page 8 MODEL INFORMATION ...................6-22 6.5.2 FIRMWARE REVISIONS..................6-22 7. COMMANDS AND 7.1 COMMANDS TARGETS 7.1.1 COMMANDS MENU ...................7-1 7.1.2 VIRTUAL INPUTS ....................7-1 7.1.3 CLEAR RECORDS .....................7-1 7.1.4 SET DATE AND TIME ..................7-2 7.1.5 RELAY MAINTENANCE ..................7-2 L90 Line Differential Relay GE Power Management...
  • Page 9 DISTANCE SETTINGS ON SERIES COMPENSATED LINES ......9-8 9.6 LINES WITH TAPPED TRANSFORMERS 9.6.1 DESCRIPTION....................9-9 9.6.2 TRANSFORMER LOAD CURRENTS..............9-9 9.6.3 FAULTS AT THE LV SIDE OF THE TRANSFORMER(S) ....... 9-10 9.6.4 EXTERNAL GROUND FAULTS ..............9-10 GE Power Management L90 Line Differential Relay...
  • Page 10 B.2.6 EXCEPTION RESPONSES................B-6 B.3 FILE TRANSFERS ® B.3.1 OBTAINING UR FILES USING MODBUS PROTOCOL ......... B-7 ® B.3.2 MODBUS PASSWORD OPERATION............. B-8 B.4 MEMORY MAPPING ® B.4.1 MODBUS MEMORY MAP ................B-9 L90 Line Differential Relay GE Power Management...
  • Page 11 CHANGES TO L90 MANUAL ................F-1 F.2 STANDARD ABBREVIATIONS F.2.1 ABBREVIATIONS ....................F-4 F.3 TABLES AND FIGURES F.3.1 LIST OF TABLES ....................F-6 F.3.2 LIST OF FIGURES..................... F-7 F.4 WARRANTY F.4.1 GE POWER MANAGEMENT WARRANTY ............. F-10 GE Power Management L90 Line Differential Relay...
  • Page 12 TABLE OF CONTENTS viii L90 Line Differential Relay GE Power Management...
  • Page 13: Getting Started

    • mounting screws • registration card (attached as the last page of the manual) • Fill out the registration form and mail it back to GE Power Management (include the serial number located on the rear nameplate). • For product information, instruction manual updates, and the latest software updates, please visit the GE Power Man- agement Home Page.
  • Page 14: Ur Overview

    This new generation of equipment must also be easily incorporated into automation systems, at both the station and enterprise levels. The GE Power Management Universal Relay (UR) has been developed to meet these goals. L90 Line Differential Relay...
  • Page 15: Ur Hardware Architecture

    The remote outputs interface to the remote inputs of other UR devices. Remote outputs are FlexLogic™ operands inserted into UCA2 GOOSE messages and are of two assignment types: DNA standard functions and USER defined functions. GE Power Management L90 Line Differential Relay...
  • Page 16: Ur Software Architecture

    MENU section. An explanation of the use of inputs from CTs and VTs is in the INTRODUCTION TO AC SOURCES section. A description of how digital signals are used and routed within the relay is contained in the INTRODUCTION TO FLEX- LOGIC™ section. L90 Line Differential Relay GE Power Management...
  • Page 17: Urpc Software

    10. Subsequently, double click on the URPC software icon to activate the application. Refer to the HUMAN INTERFACES chapter in this manual and the URPC Software Help program for more information about the URPC software interface. NOTE GE Power Management L90 Line Differential Relay...
  • Page 18: Connecting Urpc® With The L90

    URPC window. The Site Device has now been configured for RS232 communications. Proceed to Section c) CONNECTING TO THE RELAY below to begin communications. L90 Line Differential Relay GE Power Management...
  • Page 19 In a few moments, the flashing light should turn green, indicating that URPC is communicating with the relay. Refer to the HUMAN INTERFACES chapter in this manual and the URPC Software Help program for more information about the URPC software interface. NOTE GE Power Management L90 Line Differential Relay...
  • Page 20: Ur Hardware

    Figure 1–4: RELAY COMMUNICATIONS OPTIONS To communicate through the L90 rear RS485 port from a PC RS232 port, the GE Power Management RS232/RS485 con- verter box is required. This device (catalog number F485) connects to the computer using a "straight-through" serial cable.
  • Page 21: Using The Relay

    MESSAGE key from a setting value or actual value display returns to the header display. HIGHEST LEVEL LOWEST LEVEL (SETTING VALUE) TT TT SETTINGS PASSWORD ACCESS LEVEL: TT TT PRODUCT SETUP SECURITY Restricted TT TT SETTINGS TT TT SYSTEM SETUP GE Power Management L90 Line Differential Relay...
  • Page 22: Relay Activation

    FLEXLOGIC™ in the SETTINGS chapter. 1.5.8 COMMISSIONING Templated tables for charting all the required settings before entering them via the keypad are available in the COMMIS- SIONING chapter, which also includes instructions for commissioning tests. 1-10 L90 Line Differential Relay GE Power Management...
  • Page 23: Product Description

    The L90 uses per phase differential at 64 kbps transmitting 2 phaselets per cycle. The current differential scheme is based on innovative patented techniques developed by GE. The L90 algorithms are based on the Fourier transform–phaselet approach and an adaptive statistical restraint. The restraint is similar to a traditional percentage differential scheme, but is adaptive based on relay measurements.
  • Page 24: Features

    Zero-sequence removal for application on lines with tapped transformers connected in a grounded Wye on the line side • GE phaselets approach based on Discrete Fourier Transform with 64 samples per cycle and transmitting 2 time- stamped phaselets per cycle •...
  • Page 25: Functionality

    50P(2) 50_2(2) 51P(2) 51_2(2) 50BF(2) 67P(2) 50N(2) 51N(2) 67N/G Data From/To Remote End Transducer Metering FlexElement (via Dedicated Communications) Inputs 27P(2) 50G(2) 51G(2) 25(2) Line Differential Relay 831706AS.CDR Figure 2–1: SINGLE LINE DIAGRAM GE Power Management L90 Line Differential Relay...
  • Page 26: Ordering

    CPU, Digital Input/Output, Transducer I/O and L90 Communications modules. Each of these can be supplied in a number of configurations which must be specified at the time of ordering. The information required to completely spec- ify the relay is provided in the following table. L90 Line Differential Relay GE Power Management...
  • Page 27 1550 nm, single-mode, LASER, 1 Channel 1550 nm, single-mode, LASER, 2 Channel Channel 1 - RS422; Channel 2 - 1550 nm, single-mode, LASER Channel 1 - G.703, Channel 2 - 1550 nm, single -mode, LASER GE Power Management L90 Line Differential Relay...
  • Page 28 Channel 1 - RS422; Channel 2 - 1550 nm, single-mode, LASER Channel 1 - G.703, Channel 2 - 1550 nm, single -mode, LASER TRANSDUCER I/O 8 RTD Inputs 4 dcmA Inputs, 4 RTD Inputs 8 dcmA Inputs L90 Line Differential Relay GE Power Management...
  • Page 29: Pilot Channel

    Performs all functions of a Slave L90 • Receives current phasor information from all relays • Performs the Current Differential algorithm • Sends a Current Differential DTT signal to all L90 relays on the protected line GE Power Management L90 Line Differential Relay...
  • Page 30: Channel Monitor

    8 pilot signals with an L90 communications channel to create trip/block/signaling logic. A FlexLogic™ operand, an external contact closure, or a signal over the LAN communication channels can be assigned for that logic. L90 Line Differential Relay GE Power Management...
  • Page 31: Protection & Control Functions

    FlexLogic™ equations. All of the outputs, except for the self test criti- cal alarm contacts, may also be assigned by the user. GE Power Management L90 Line Differential Relay...
  • Page 32: Metering & Monitoring Functions

    When running under normal power system conditions, the relay processors will have “idle” time. During this time, each pro- cessor performs “background” self-tests that are not disruptive to the foreground processing. 2-10 L90 Line Differential Relay GE Power Management...
  • Page 33: Other Functions

    The relay includes a clock which can run freely from the internal oscillator or be synchronized from an external IRIG-B sig- nal. With the external signal, all relays wired to the same synchronizing signal will be synchronized to within 0.1 millisecond. 2.5.4 FUNCTION DIAGRAMS Figure 2–3: L90 BLOCK DIAGRAM GE Power Management L90 Line Differential Relay 2-11...
  • Page 34 Voltages Compensation Sample Phaselets Compute Phaselets Phaselets Phasors Align Phaselets Window Compute Phasors and Control Window Variance Parameters Reset Phaselets swmoduls.cdr Fault Detector Trip Disturbance Logic Detector Figure 2–4: MAIN SOFTWARE MODULES 2-12 L90 Line Differential Relay GE Power Management...
  • Page 35: Technical Specifications

    Time Delay: 0.000 to 65.535 s in steps of 0.001 Operation Time: 1 to 1.5 cycles (typical) Timing Accuracy: ±3% or 4 ms, whichever is greater Reset Time: 1 power cycle (typical) GE Power Management L90 Line Differential Relay 2-13...
  • Page 36 0.00 to 600.00 s in steps of 0.01 Inverse; IEC (and BS) A/B/C and Short Reset Delay: 0.00 to 600.00 s in steps of 0.01 Inverse; GE IAC Inverse, Short/Very/ < 20 ms at 3 × Pickup at 60 Hz Operate Time: Extremely Inverse; I t;...
  • Page 37 Positive Seq. OV Delay: 0.000 to 65.535 s Level Accuracy: ±0.5% of reading from 10 to 208 V SYNCHROCHECK Curve Shapes: GE IAV Inverse; Max Volt Difference: 0 to 100000 V in steps of 1 Definite Time (0.1s base curve) °...
  • Page 38: User Programmable Elements

    Digital input change of state (user data) %error Digital output change of state (user data) %error Self-test events (user data) Line%error Data Storage: In non-volatile memory METHOD +(Chapter 6) %error RELAY ACCURACY + (1.5%) %error 2-16 L90 Line Differential Relay GE Power Management...
  • Page 39: Metering

    20 to 65 Hz Relay Burden: < 0.25 VA at 120 V Conversion Range: 1 to 275 V Voltage Withstand: cont. at 260 V to neutral 1 min./hr at 420 V to neutral GE Power Management L90 Line Differential Relay 2-17...
  • Page 40: Power Supply

    820 nm, multi-mode, half-duplex/full- together at 36 Vpk duplex fiber optic with ST connector Typical Distance: 1200 m Power Budget: 10 db Max Optical Ip Power: –7.6 dBm Typical Distance: 1.65 km 2-18 L90 Line Differential Relay GE Power Management...
  • Page 41: Inter-relay Communications

    Operating Temperatures: Humidity (noncondensing): IEC 60068-2-30, 95%, Variant 1, 6 Cold: IEC 60028-2-1, 16 h at –40°C days Dry Heat: IEC 60028-2-2, 16 h at 85°C Altitude: Up to 2000 m Installation Category: GE Power Management L90 Line Differential Relay 2-19...
  • Page 42: Type Tests

    EN 50082-2 Manufactured under an ISO9000 Registered system. 2.6.14 MAINTENANCE Cleaning: Normally, cleaning is not required; but for situations where dust has accumulated on the faceplate display, a dry cloth can be used. 2-20 L90 Line Differential Relay GE Power Management...
  • Page 43: Hardware

    The relay must be mounted such that the faceplate sits semi-flush with the panel or switchgear door, allowing the operator access to the keypad and the RS232 communications port. The relay is secured to the panel with the use of four screws supplied with the relay. UR SERIES UR SERIES Figure 3–1: L90 VERTICAL MOUNTING AND DIMENSIONS...
  • Page 44 3.1 DESCRIPTION 3 HARDWARE Figure 3–2: L90 VERTICAL SIDE MOUNTING INSTALLATION L90 Line Differential Relay GE Power Management...
  • Page 45 (450.1) INCHES PANEL MOUNTING 4x0.28" Dia. (mm) (7.1) 18.37" FRONT VIEW (466.6) 4.00" 7.13" CUTOUT (181.1) (101.6) 7.00" (177.8) 17.75" 1.57" 19.00" (450.8) (39.8) (482.6) 827704B3.DWG Figure 3–4: L90 HORIZONTAL MOUNTING AND DIMENSIONS GE Power Management L90 Line Differential Relay...
  • Page 46: Module Withdrawal / Insertion

    Type 9C and 9D CPU modules are equipped with 10BaseT and 10BaseF Ethernet connectors for communications. These connectors must be individually disconnected from the module before the it can be removed from the chas- NOTE sis. L90 Line Differential Relay GE Power Management...
  • Page 47: 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 3–7: EXAMPLE OF MODULES IN F & H SLOTS GE Power Management L90 Line Differential Relay...
  • Page 48: Wiring

    CONTACT IN CONTACT IN COMMON SURGE CONTACT IN DIGITAL I/O CONTACT IN CONTACT IN CONTACT IN COMMON SURGE GE Power Management L90 Line Differential Relay CONTACT IN CONTACT IN CONTACT IN CONTACT IN COMMON CONTACT IN CONTACT IN CONTACT IN COMPUTER...
  • Page 49: Dielectric Strength Ratings And Testing

    Table 3–2: CONTROL POWER VOLTAGE RANGE RANGE NOMINAL VOLTAGE 24 to 48 V (DC only) 125 to 250 V The power supply module provides power to the relay and supplies power for dry contact input connections. GE Power Management L90 Line Differential Relay...
  • Page 50: 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 CT so that ground fault current will be detected is shown below. Twisted pair cabling on the zero sequence CT is recommended. L90 Line Differential Relay GE Power Management...
  • Page 51 Figure 3–11: CT/VT MODULE WIRING CURRENT INPUTS 8C / 8D / 8Z CTMDL8CD.cdr (P/O 827831A1.CDR) Figure 3–12: CT MODULE WIRING Wherever a tilde “~” symbol appears, substitute with the Slot Position of the module. NOTE GE Power Management L90 Line Differential Relay...
  • Page 52: Contact Inputs/outputs

    Cont Op x Ioff Load b) Current with optional voltage monitoring Current monitoring only Both voltage and current monitoring (external jumper a-b is required) Load c) No monitoring 827821A4.CDR Figure 3–13: FORM-A CONTACT FUNCTIONS 3-10 L90 Line Differential Relay GE Power Management...
  • Page 53 Fast Form-C 2 Inputs 2 Inputs Fast Form-C ~6a, ~6c ~6a, ~6c ~7a, ~7c 2 Inputs ~7a, ~7c 2 Inputs Fast Form-C ~8a, ~8c 2 Inputs ~8a, ~8c 2 Inputs Fast Form-C GE Power Management L90 Line Differential Relay 3-11...
  • Page 54 Form-A Form-A Form-A Form-A Form-A Form-A ~5a, ~5c 2 Inputs Form-A ~6a, ~6c 2 Inputs Form-A ~7a, ~7c 2 Inputs ~7a, ~7c 2 Inputs ~8a, ~8c 2 Inputs ~8a, ~8c 2 Inputs 3-12 L90 Line Differential Relay GE Power Management...
  • Page 55 CONTACT IN CONTACT IN CONTACT IN CONTACT IN CONTACT IN COMMON COMMON SURGE CONTACT IN CONTACT IN CONTACT IN CONTACT IN COMMON SURGE Figure 3–14: DIGITAL I/O MODULE WIRING (SHEET 1 OF 2) GE Power Management L90 Line Differential Relay 3-13...
  • Page 56 827719AR.CDR Sheet 2 of 2 Figure 3–15: DIGITAL I/O MODULE WIRING (SHEET 2 OF 2) CORRECT POLARITY MUST BE OBSERVED FOR ALL CONTACT INPUT CONNECTIONS OR EQUIP- MENT DAMAGE MAY RESULT. CAUTION 3-14 L90 Line Differential Relay GE Power Management...
  • Page 57 DC current flowing through the contacts when the Form-A contact closes. If enabled, the cur- rent monitoring can be used as a seal-in signal to ensure that the Form-A contact does not attempt to break the energized inductive coil circuit and weld the output contacts. GE Power Management L90 Line Differential Relay 3-15...
  • Page 58: Transducer Inputs/outputs

    Comp dcmA In Comp Comp dcmA In Return for RTD 7 & Comp SURGE Return for RTD 7 & Comp SURGE Comp ANALOGIO.CDR SURGE FROM 827831A6.CDR Figure 3–17: TRANSDUCER I/O MODULE WIRING 3-16 L90 Line Differential Relay GE Power Management...
  • Page 59: Rs232 Faceplate Program Port

    COM 1 10BaseT TEST ONLY 10BaseT TEST ONLY RS485 RS485 RS485 COM 2 COM 2 COM 2 IRIG-B IRIG-B IRIG-B SURGE GROUND SURGE SURGE COMMOD.CDR P/O 827719C2.CDR Figure 3–19: CPU MODULE COMMUNICATIONS WIRING GE Power Management L90 Line Differential Relay 3-17...
  • Page 60 EACH END (TYPICALLY 120 Ohms and 1 nF) 485 - SURGE COMP 485COM UP TO 32 DEVICES, RELAY MAXIMUM 4000 FEET 485 + 485 - SURGE COMP 485COM LAST DEVICE 827757A5.DWG Figure 3–20: RS485 SERIAL CONNECTION 3-18 L90 Line Differential Relay GE Power Management...
  • Page 61: Irig-b

    (AM). Third party equipment is available for generating the IRIG-B signal; this equipment may use a GPS satellite system to obtain the time reference so that devices at different geographic locations can also be synchronized. GE Power Management L90 Line Differential Relay...
  • Page 62: L90 Channel Communication

    The L90 Current Differential Function must be “Enabled” for the Communications Module to work. Refer to ÖØ Ö Ö menu. SETTINGS CONTROL ELEMENTS LINE DIFFERENTIAL CURRENT DIFFERENTIAL NOTE OBSERVING ANY FIBER TRANSMITTER OUTPUT MAY CAUSE INJURY TO THE EYE. CAUTION 3-20 L90 Line Differential Relay GE Power Management...
  • Page 63: Fiber: Led & Eled Transmitters

    2 Channels 831720A3.CDR Figure 3–23: LASER FIBER MODULES When using a LASER Interface, attenuators may be necessary to ensure that you do not exceed Maximum Optical Input Power to the receiver. WARNING GE Power Management L90 Line Differential Relay 3-21...
  • Page 64: Interface

    The original location of the module should be recorded to help ensure that the same or replacement module is inserted into the correct slot. Step 2: Remove the module cover screw. 3-22 L90 Line Differential Relay GE Power Management...
  • Page 65 If Octet Timing is enabled (ON), this 8 kHz signal will be asserted during the violation of Bit 8 (LSB) necessary for connect- ing to higher order systems. When L90's are connected back to back, Octet Timing should be disabled (OFF). GE Power Management L90 Line Differential Relay...
  • Page 66 Differential Manchester Receiver module and then is returned to the Differential Manchester Transmitter module. Likewise, G.703 data enters the G.703 Receiver module and is passed through to the G.703 Transmitter module to be 3-24 L90 Line Differential Relay GE Power Management...
  • Page 67: Rs422 Interface

    RS422 RS422 Tx + Tx + CHANNEL 1 CHANNEL 1 Rx + Rx + Shld. Shld. CLOCK CLOCK SURGE SURGE 64 KHz 831728A3.CDR Figure 3–30: TYPICAL PIN INTERCONNECTION BETWEEN TWO RS422 INTERFACES GE Power Management L90 Line Differential Relay 3-25...
  • Page 68 Data Module 2 TT(A) and TT(B) inputs via the ST(A) and AT(B) outputs. The Data Module Pin Numbers, in the figure above, have been omitted since they may vary depending on the manufacturer. NOTE 3-26 L90 Line Differential Relay GE Power Management...
  • Page 69 16X, and uses this clock along with the data-stream to generate a data clock that can be used as the SCC (Serial Communication Controller) receive clock. GE Power Management L90 Line Differential Relay...
  • Page 70: Rs422 & Fiber Interface

    Optical Input Power to the receiver. WARNING Shld. Tx - G.703 Rx - CHANNEL 1 Tx + Rx + SURGE FIBER CHANNEL 2 G703.CDR P/O 827831A7.CDR Figure 3–34: G.703 & FIBER INTERFACE CONFIGURATION 3-28 L90 Line Differential Relay GE Power Management...
  • Page 71: Human Interfaces

    You can create or edit a FlexLogic™ equation in order to customize the relay. You can subsequently view the automatically generated logic diagram. d) VIEWING ACTUAL VALUES You can view real-time relay data such as input/output status and measured parameters. GE Power Management L90 Line Differential Relay...
  • Page 72 “EEPROM DATA ERROR” message displayed after upgrading/downgrading the firmware is a resettable, self-test message intended to inform users that the Modbus addresses have changed with the upgraded firmware. This message does not signal any problems when appearing after firmware upgrades. L90 Line Differential Relay GE Power Management...
  • Page 73: Urpc ® Software Main Window

    Settings List control bar window Device data view window(s), with common tool bar Settings File data view window(s), with common tool bar Workspace area with data view tabs Status bar Figure 4–1: URPC SOFTWARE MAIN WINDOW GE Power Management L90 Line Differential Relay...
  • Page 74: Faceplate Interface

    VOLTAGE TROUBLE CURRENT RESET TEST MODE FREQUENCY LED PANEL 1 TRIP OTHER USER 1 ALARM PHASE A PICKUP PHASE B USER 2 PHASE C NEUTRAL/GROUND USER 3 Figure 4–3: UR VERTICAL FACEPLATE PANELS L90 Line Differential Relay GE Power Management...
  • Page 75: Led Indicators

    OTHER: Indicates a composite function was involved. • PHASE A: Indicates Phase A was involved. • PHASE B: Indicates Phase B was involved. • PHASE C: Indicates Phase C was involved. • NEUTRAL/GROUND: Indicates neutral or ground was involved. GE Power Management L90 Line Differential Relay...
  • Page 76 TINGS chapter in the D60 manual. The LEDs are fully user-programmable. The default labels can be replaced by user- printed labels for both LED panels 2 and 3 as explained in the next section. L90 Line Differential Relay GE Power Management...
  • Page 77: Custom Labeling Of Leds

    For Position and Size enable the "Center image" and "Maintain aspect ratio" check boxes and press "OK", then "OK" once more to print. From the printout, cut-out the BACKGROUND TEMPLATE from the three windows (use the cropmarks as a guide). GE Power Management L90 Line Differential Relay...
  • Page 78: Display

    The key may be pressed at any time for context sensitive help messages. The key stores altered setting values. MENU HELP MESSAGE ESCAPE VALUE ENTER Figure 4–8: KEYPAD L90 Line Differential Relay GE Power Management...
  • Page 79: Breaker Control

    USER 2=CLS/USER 3=OP (2) and (3). Repeatedly pressing the USER 1 key alternates between available breakers. Pressing keys other than USER 1, 2 or 3 at any time aborts the breaker control function. GE Power Management L90 Line Differential Relay...
  • Page 80: Menus

    MESSAGE key from a setting value or actual value display returns to the header display. HIGHEST LEVEL LOWEST LEVEL (SETTING VALUE) TT TT SETTINGS PASSWORD ACCESS LEVEL: TT TT PRODUCT SETUP SECURITY Restricted TT TT SETTINGS TT TT SYSTEM SETUP 4-10 L90 Line Differential Relay GE Power Management...
  • Page 81: Changing Settings

    While at the maximum value, pressing the VALUE key again will allow the setting selection to continue upward from the minimum value. The VALUE key decrements the displayed value by the step value, down to the GE Power Management L90 Line Differential Relay 4-11...
  • Page 82 Flash messages will sequentially appear for several seconds each. For the case of a text setting message, the key displays how to edit and store a new value. 4-12 L90 Line Differential Relay GE Power Management...
  • Page 83 Press the key until the 'SETTINGS' header flashes momentarily and the ‘SETTINGS PRODUCT SETUP’ mes- sage appears on the display. Press the MESSAGE key until the ‘ACCESS LEVEL:’ message appears on the display. GE Power Management L90 Line Differential Relay 4-13...
  • Page 84 (for each security level) before a new password can be entered. In the event that a password has been lost (forgotten), submit the corresponding Encrypted Password from the PASS- WORD SECURITY menu to the Factory for decoding. 4-14 L90 Line Differential Relay GE Power Management...
  • Page 85: Settings

    „ SIGNAL SOURCES „ See page 5-26. „ L90 POWER SYSTEM „ See page 5-28. „ LINE „ See page 5-30. „ BREAKERS „ See page 5-31. „ FLEXCURVES „ See page 5-34. GE Power Management L90 Line Differential Relay...
  • Page 86 VIRTUAL INPUTS See page 5-153. CONTACT OUTPUTS See page 5-154. VIRTUAL OUTPUTS See page 5-155. REMOTE DEVICES See page 5-155. REMOTE INPUTS See page 5-156. REMOTE OUTPUTS See page 5-157. DNA BIT PAIRS L90 Line Differential Relay GE Power Management...
  • Page 87: Introduction To Elements

    This setting programs the element to be operational when selected as "Enabled". The factory default is "Disabled". Once programmed to "Enabled", any element associated with the Function becomes active and all options become available. GE Power Management L90 Line Differential Relay...
  • Page 88: Introduction To Ac Sources

    RMS magnitude, phase-phase or phase-ground voltage, etc.) to be measured. The user com- pletes the selection process by selecting the instrument transformer input channels to be used and some of the parameters L90 Line Differential Relay GE Power Management...
  • Page 89 Source as 'Wdg 1 Current'. Once the Sources have been configured, the user has them available as selections for the choice of input signal for the pro- tection elements and as metered quantities. GE Power Management L90 Line Differential Relay...
  • Page 90 Source is a transformer winding, on which a three phase voltage is mea- sured, and the sum of the currents from CTs on each of two breakers is required to measure the winding current flow. L90 Line Differential Relay GE Power Management...
  • Page 91: Product Setup

    If an entered password is lost (or forgotten), consult the factory service department with the corresponding ENCRYPTED PASSWORD If the password and password are set the same, the one password will allow access to SETTING COMMAND commands and settings. NOTE GE Power Management L90 Line Differential Relay...
  • Page 92: Display Properties

    For each RS485 port, the minimum time before the port will transmit after receiving data from a host can be set. This feature allows operation with hosts which hold the RS485 transmitter active for some time after NOTE each transmission. L90 Line Differential Relay GE Power Management...
  • Page 93 When the NSAP address, any TCP/UDP Port Number, or any User Map setting (when used with DNP) is changed, it will not become active until power to the relay has been cycled (OFF/ON). NOTE GE Power Management L90 Line Differential Relay...
  • Page 94 DNP UNSOL RESPONSE MESSAGE DEST ADDRESS: 1 Range: Enabled, Disabled USER MAP FOR DNP MESSAGE ANALOGS: Disabled Range: 1 to 6 in steps of 1 NUMBER OF SOURCES MESSAGE IN ANALOG LIST: 1 5-10 L90 Line Differential Relay GE Power Management...
  • Page 95 DNP address to which all unsolicited responses are sent. The IP DNP UNSOL RESPONSE DEST ADDRESS address to which unsolicited responses are sent is determined by the L90 from either the current DNP TCP connection or the most recent UDP message. GE Power Management L90 Line Differential Relay 5-11...
  • Page 96 Range: Up to 16 alphanumeric characters representing the name of UCA LOGICAL DEVICE: MESSAGE the UCA logical device. UCADevice Range: 1 to 65535 in steps of 1 UCA/MMS TCP PORT MESSAGE NUMBER: 5-12 L90 Line Differential Relay GE Power Management...
  • Page 97 TFTP server. TFTP client software is available from various sources, including Microsoft Windows NT. The file "dir.txt" is an ASCII text file that can be transferred from the L90. This file contains a list and description of all the files available from the UR (event records, oscillography, etc.). GE Power Management L90 Line Differential Relay 5-13...
  • Page 98 FUNCTION setting is set to Enabled, the DNP protocol will not be operational. When this setting is changed NOTE it will not become active until power to the relay has been cycled (OFF/ON). 5-14 L90 Line Differential Relay GE Power Management...
  • Page 99 Target Messages that are set at the time of triggering • Events (9 before trigger and 7 after trigger) The captured data also includes the fault type and the distance to the fault location, as well as the reclose shot number. GE Power Management L90 Line Differential Relay 5-15...
  • Page 100 DIGITAL CHANNEL 63: „ Range: 1 to 16 channels ANALOG CHANNELS „ Range: Off, any analog Actual Value parameter ANALOG CHANNEL 1: ↓ Range: Off, any analog Actual Value parameter ANALOG CHANNEL 16: 5-16 L90 Line Differential Relay GE Power Management...
  • Page 101 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. When the setting is altered, all oscillography records will be CLEARED. NUMBER OF RECORDS WARNING GE Power Management L90 Line Differential Relay 5-17...
  • Page 102 POWER DEMAND METHOD: MESSAGE Rolling Demand Thermal Exponential Range: 5, 10, 15, 20, 30, 60 minutes DEMAND INTERVAL: MESSAGE 15 MIN Range: FlexLogic™ operand DEMAND TRIGGER: MESSAGE Note: for calculation using Method 2a 5-18 L90 Line Differential Relay GE Power Management...
  • Page 103 Block Interval. The value is updated every minute and indicates the demand over the time interval just preceding the time of update. GE Power Management L90 Line Differential Relay 5-19...
  • Page 104 BREAKER 1 TROUBLE LED 23 Operand AR RIP LED 12 Operand LED 24 Operand AR LO Refer to the CONTROL OF SETTINGS GROUPS example in the CONTROL ELEMENTS section for group activation. 5-20 L90 Line Differential Relay GE Power Management...
  • Page 105: Flex State Parameters

    Range: 0 to 65535 in steps of 1 DISP 1 ITEM 4 MESSAGE Range: 0 to 65535 in steps of 1 DISP 1 ITEM 5: MESSAGE „ USER DISPLAY 2 „ ↓ „ USER DISPLAY 8 „ GE Power Management L90 Line Differential Relay 5-21...
  • Page 106 This item is not being used - there is no corresponding DISP 1 ITEM 5: MESSAGE Tilde marker in Top or Bottom lines. Shows the resultant display content. USER DISPLAYS Current X 0.850 A → Current Y 0.327 A 5-22 L90 Line Differential Relay GE Power Management...
  • Page 107: Installation

    This name will appear on generated reports. This name RELAY NAME is also used to identify specific devices which are engaged in automatically sending/receiving data over the Ethernet com- munications channel using the UCA2/MMS protocol. GE Power Management L90 Line Differential Relay 5-23...
  • Page 108: System Setup

    SRC1 currents, then PKP level of 1 pu will operate on 1000 A primary. The same rule will apply for sums of currents from CTs with different secondary taps (5 A and 1 A). 5-24 L90 Line Differential Relay GE Power Management...
  • Page 109: Power System

    ABC or ACB. CT and VT inputs on the relay, labeled as A, B, and C, must be con- nected to system phases A, B, and C for correct operation. GE Power Management L90 Line Differential Relay...
  • Page 110: Signal Sources

    CT and VT input. For CT inputs, this is the nominal primary and secondary current. For VTs, this is the connection type, ratio and nominal secondary voltage. Once the inputs have been specified, the configuration for each Source is entered, including specifying which CTs will be summed together. 5-26 L90 Line Differential Relay GE Power Management...
  • Page 111 An example of the use of Sources, with a relay with three CT/VT modules, is shown in the diagram below. A relay could have the following hardware configuration: INCREASING SLOT POSITION LETTER --> CT/VT MODULE 1 CT/VT MODULE 2 CT/VT MODULE 3 GE Power Management L90 Line Differential Relay 5-27...
  • Page 112: L90 Power System

    NUMBER: 0 Range: 0 to 255 in steps of 1 TERMINAL 2 RELAY ID MESSAGE NUMBER: 0 NUMBER OF TERMINALS: This setting is the number of the terminals of the associated protected line. 5-28 L90 Line Differential Relay GE Power Management...
  • Page 113 If the reactors installed at both ends of the line are different, the following equations apply:   ⁄ For 2 terminal line: --------------------------------------- - --------------------------------------- -   react react_n_terminal1 react_n_terminal2 GE Power Management L90 Line Differential Relay 5-29...
  • Page 114: Line

    These settings specify the characteristics of the line. The line impedance value should be entered as secondary ohms. Ö ÖØ This data is used for fault location calculations. See the menu for assigning SETTINGS PRODUCT SETUP FAULT REPORT the Source and Trigger for fault calculations. 5-30 L90 Line Differential Relay GE Power Management...
  • Page 115: Breakers

    No. 1. BREAKER 1 FUNCTION: Set to "Enable" to allow the operation of any breaker control feature. BREAKER1 PUSH BUTTON CONTROL: Set to "Enable" to allow faceplate push button operations. BREAKER 1 NAME: GE Power Management L90 Line Differential Relay 5-31...
  • Page 116 USER 1 on the relay faceplate) until the automatic de-selection of the breaker, so that the breaker does not remain selected indefinitely. This setting is active only if is "Enabled". BREAKER PUSHBUTTON CONTROL 5-32 L90 Line Differential Relay GE Power Management...
  • Page 117 5 SETTINGS 5.3 SYSTEM SETUP Figure 5–6: DUAL BREAKER CONTROL SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-33...
  • Page 118: Flexcurves

    1, i.e. 0.98 pu and 1.03 pu. It is recommended to set the two times to a similar value; otherwise, the linear approximation may result in undesired behavior for the operating quantity the is close to 1.00 pu. 5-34 L90 Line Differential Relay GE Power Management...
  • Page 119: Flexlogic

    Traditionally, protective relay logic has been relatively limited. Any unusual applications involving interlocks, blocking, or supervisory functions had to be hard-wired using contact inputs and outputs. FlexLogic™ minimizes the requirement for auxiliary components and wiring while making more complex schemes possible. GE Power Management L90 Line Differential Relay 5-35...
  • Page 120 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"). 5-36 L90 Line Differential Relay GE Power Management...
  • Page 121 BREAKER 1 ONE P OPEN Only one pole of Breaker 1 is open BREAKER 1 OOS Breaker 1 is out of service BREAKER 2 Same set of operands as shown for BREAKER 1 GE Power Management L90 Line Differential Relay 5-37...
  • Page 122 Negative Sequence Time Overcurrent 1 has operated NEG SEQ TOC1 DPO Negative Sequence Time Overcurrent 1 has dropped out NEG SEQ TOC2 Same set of operands as shown for NEG SEQ TOC1 5-38 L90 Line Differential Relay GE Power Management...
  • Page 123 PHASE OV1 DPO A Phase A of OV1 has dropped out PHASE OV1 DPO B Phase B of OV1 has dropped out PHASE OV1 DPO C Phase C of OV1 has dropped out GE Power Management L90 Line Differential Relay 5-39...
  • Page 124 (will not appear unless ordered) ↓ ↓ Current (from detector on Cont Op 1 IOff (will not appear unless ordered) Form-A output only) Cont Op 2 IOff (will not appear unless ordered) ↓ ↓ 5-40 L90 Line Differential Relay GE Power Management...
  • Page 125 ID of any of these operands, the assigned name will appear in the relay list of operands. The default names are shown in the FLEXLOGIC™ OPERANDS table above. The characteristics of the logic gates are tabulated below, and the operators available in FlexLogic™ are listed in the FLEX- LOGIC™ OPERATORS table. GE Power Management L90 Line Differential Relay 5-41...
  • Page 126 Assigns previous FlexLogic™ parameter to Virtual The virtual output is set by the preceding ↓ Virtual Output Output 1. parameter ↓ = Virt Op 64 Assigns previous FlexLogic™ parameter to Virtual Output 64. 5-42 L90 Line Differential Relay GE Power Management...
  • Page 127: Flexlogic™ Rules

    AND gate are required, connect inputs 1 through 16 to one AND(16), 17 through 25 to another AND(9), and the outputs from these two gates to a third AND(2). GE Power Management L90 Line Differential Relay 5-43...
  • Page 128 Figure 5–10: LOGIC FOR VIRTUAL OUTPUT 3 Prepare a logic diagram for Virtual Output 4, replacing the logic ahead of Virtual Output 3 with a symbol identified as Virtual Output 3, as shown below. 5-44 L90 Line Differential Relay GE Power Management...
  • Page 129 95: The last step in the procedure is to specify the upper input to the AND gate, the operated state of digital element 2. This operand is "DIG ELEM 2 OP". Writing the parameters in numerical order can now form the equation for VIRTUAL OUTPUT 3: GE Power Management L90 Line Differential Relay 5-45...
  • Page 130 [87] Virt Op 2 On [88] Virt Ip 1 On [89] DIG ELEM 1 PKP [90] XOR(2) [91] Virt Op 3 On [92] OR(4) [93] LATCH (S,R) [94] Virt Op 3 On 5-46 L90 Line Differential Relay GE Power Management...
  • Page 131 DIG ELEM 2 OP Cont Ip H1c On AND(2) = Virt Op 3 Virt Op 4 On Virt Op 1 On Virt Op 2 On Virt Ip 1 On DIG ELEM 1 PKP XOR(2) GE Power Management L90 Line Differential Relay 5-47...
  • Page 132: Flexlogic™ Equation Editor

    This setting is used to set the time delay to pickup. If a pickup delay is not required, set this function to "0". TIMER 1 DROPOUT DELAY: This setting is used to set the time delay to dropout. If a dropout delay is not required, set this function to "0". 5-48 L90 Line Differential Relay GE Power Management...
  • Page 133: 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 Power Management L90 Line Differential Relay 5-49...
  • Page 134 The FLEXELEMENT 1 DIRECTION following figure explains the application of the FLEXELEMENT 1 DIRECTION FLEXELEMENT 1 PICKUP FLEXELEMENT 1 HYS- settings. TERESIS 5-50 L90 Line Differential Relay GE Power Management...
  • Page 135 DIRECTION = Under; FLEXELEMENT COMP MODE = Signed; FlexElement 1 OpSig FLEXELEMENT 1 PKP FLEXELEMENT DIRECTION = Under; FLEXELEMENT COMP MODE = Absolute; FlexElement 1 OpSig 842706A1.CDR Figure 5–17: FLEXELEMENT™ INPUT MODE SETTING GE Power Management L90 Line Differential Relay 5-51...
  • Page 136 "Delta". 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. 5-52 L90 Line Differential Relay GE Power Management...
  • Page 137: Grouped Elements

    (see the CONTROL ELEMENTS section for additional details). 5.5.3 LINE DIFFERENTIAL ELEMENTS Ø Ö Ö PATH: SETTINGS GROUPED ELEMENTS SETTING GROUP 1(8) LINE DIFFERENTIAL ELEMENTS „ „ LINE DIFFERENTIAL CURRENT „ „ ELEMENTS DIFFERENTIAL „ STUB BUS „ MESSAGE GE Power Management L90 Line Differential Relay 5-53...
  • Page 138: Current Differential

    CTs (where CTprim_rem / CTprim_loc is referred to as CT primary rated current). See the CURRENT DIFFEREN- TIAL SETTINGS application example in Chapter 9. CURRENT DIFF CT TAP 2: As above for remote terminal 2 (communication channel 2) 5-54 L90 Line Differential Relay GE Power Management...
  • Page 139 CURRENT DIFF KEY DTT: This setting is used to select additional protection element (i.e distance element or breaker failure), which key the DTT besides the current differential element on per three-phase basis. GE Power Management L90 Line Differential Relay 5-55...
  • Page 140 5.5 GROUPED ELEMENTS 5 SETTINGS Figure 5–18: CURRENT DIFFERENTIAL SCHEME LOGIC 5-56 L90 Line Differential Relay GE Power Management...
  • Page 141: Stub Bus

    IOC PKP (pickup) operand. The source assigned for the current STUB BUS TRIGGER of this element must cover the stub between current transformers of the associated breakers and disconnect switch. GE Power Management L90 Line Differential Relay 5-57...
  • Page 142: Line Pickup

    Faults other than close- in faults can be identified satisfactorily by the distance elements which initially will be self or faulted phase polarized and then become memory polarized when a satisfactory memory signal is available. 5-58 L90 Line Differential Relay GE Power Management...
  • Page 143 The positive sequence undervoltage pickup setting is based on phase to neutral quantities. If Delta VTs are used, then this per unit pickup is based on the ( setting) / VT SECONDARY Figure 5–20: LINE PICKUP LOGIC GE Power Management L90 Line Differential Relay 5-59...
  • Page 144: Distance

    5 cy Use V_1 mem V_1 > 0.8 pu IA < 0.05 pu Use V_1 IB < 0.05 pu IC < 0.05 pu V_1 < 0.1 pu 827842A2.CDR Figure 5–21: MEMORY VOLTAGE LOGIC 5-60 L90 Line Differential Relay GE Power Management...
  • Page 145 GROUPED ELEMENTS SETTING GROUP 1(8) DISTANCE ÖØ • Memory duration (common for both phase and ground elements of all four zones as entered under SETTINGS Ö ÖØ GROUPED ELEMENTS SETTING GROUP 1(8) DISTANCE GE Power Management L90 Line Differential Relay 5-61...
  • Page 146 Figure 5–22: MHO DISTANCE CHARACTERISTIC COMP LIMIT COMP LIMIT DIR COMP LIMIT DIR COMP LIMIT DIR RCA LFT BLD RCA RGT BLD RCA -LFT BLD RGT BLD 837721A1.CDR Figure 5–23: QUAD DISTANCE CHARACTERISTIC 5-62 L90 Line Differential Relay GE Power Management...
  • Page 147 DIR COMP LIMIT = 60 RGT BLD RCA = 90 RGT BLD RCA = 80 LFT BLD RCA = 90 LFT BLD RCA = 80 837723A1.CDR Figure 5–25: QUAD DISTANCE CHARACTERISTIC SAMPLE SHAPES GE Power Management L90 Line Differential Relay 5-63...
  • Page 148 VT fuse fail conditions. This requirement may be difficult to meet for remote faults at the end of Zone 2. If this is the case, the current supervision pickup would be set below the full load current, but this may result in maloperation during fuse fail conditions. 5-64 L90 Line Differential Relay GE Power Management...
  • Page 149 PH DIST Z2 PKP AB 20 msec FLEXLOGIC OPERAND PH DIST Z2 PKP BC PH DIST Z2 OP 20 msec PH DIST Z2 PKP CA 20 msec 837020A4.CDR Figure 5–26: PHASE DISTANCE Z2 OP SCHEME GE Power Management L90 Line Differential Relay 5-65...
  • Page 150 5.5 GROUPED ELEMENTS 5 SETTINGS In the L60 and L90 relay, all settings and operands are labeled as Z2 NOTE Figure 5–27: PHASE DISTANCE Z2 SCHEME LOGIC 5-66 L90 Line Differential Relay GE Power Management...
  • Page 151 Range: 0.000 to 65.535 s in steps of 0.001 GND DIST Z2 MESSAGE DELAY:0.000 s Range: FlexLogic™ operand GND DIST Z2 BLK: MESSAGE Range: Self-Rest, Latched, Disabled GND DIST Z2 MESSAGE TARGET: Self-Reset GE Power Management L90 Line Differential Relay 5-67...
  • Page 152 GND DIST Z2 ZOM/Z1 ANG: This setting specifies the angle difference between the mutual zero-sequence impedance between the lines and the posi- tive-sequence impedance of the protected line. 5-68 L90 Line Differential Relay GE Power Management...
  • Page 153 . See the DISTANCE SOURCE THEORY OF OPERATION chapter for more details, and the APPLICATION OF SETTINGS chapter for information on how to calculate this setting for applications on series compensated lines. GE Power Management L90 Line Differential Relay 5-69...
  • Page 154 V_0 > 5 Volts SETTING FLEXLOGIC OPERAND DISTANCE SOURCE: GND DIST Z2 DIR SUPN ZERO SEQ DIRECTIONAL CO-ORDINATING TIME Pickup 4.5 cycles, Reset 1.0 cycle 837009A5.CDR Figure 5–29: GROUND DIRECTIONAL SUPERVISION SCHEME LOGIC – Z2 5-70 L90 Line Differential Relay GE Power Management...
  • Page 155 5 SETTINGS 5.5 GROUPED ELEMENTS Figure 5–30: GROUND DISTANCE Z2 SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-71...
  • Page 156: Power Swing Detect

    Range: Early, Delayed POWER SWING TRIP MESSAGE MODE: Delayed Range: Flexlogic™ operand POWER SWING BLK: MESSAGE Range: Self-Reset, Latched, Disabled POWER SWING MESSAGE TARGET: Self-Reset Range: Disabled, Enabled POWER SWING MESSAGE EVENTS: Disabled 5-72 L90 Line Differential Relay GE Power Management...
  • Page 157 It is up to the user to integrate the blocking (POWER SWING BLOCK) and tripping (POWER SWING TRIP) FlexLogic™ operands with other protection functions and output contacts in order to make this element fully operational. GE Power Management L90 Line Differential Relay...
  • Page 158 FLEXLOGIC OPERAND MIDDLE IMPEDANCE POWER SWING MIDDLE REGION FLEXLOGIC OPERAND INNER IMPEDANCE POWER SWING INNER REGION SETTING POWER SWING SUPV: I_1 > PICKUP 827840A1.CDR Figure 5–32: POWER SWING DETECT LOGIC (1 of 2) 5-74 L90 Line Differential Relay GE Power Management...
  • Page 159 5 SETTINGS 5.5 GROUPED ELEMENTS FLEXLOGIC OPERANDS POWER SWING INNER POWER SWING MIDDLE POWER SWING OUTER Figure 5–33: POWER SWING DETECT LOGIC (2 of 2) GE Power Management L90 Line Differential Relay 5-75...
  • Page 160 (the actual trip may be delayed as per the setting). Therefore, this angle must be selected in consider- TRIP MODE ation to the power swing angle beyond which the system becomes unstable and cannot recover. 5-76 L90 Line Differential Relay GE Power Management...
  • Page 161 This setting specifies the FlexLogic™ operand used for blocking the out-of-step function only. The power swing blocking function is operational all the time as long as the element is enabled. The blocking signal resets the output POWER SWING TRIP operand but does not stop the out-of-step tripping sequence. GE Power Management L90 Line Differential Relay 5-77...
  • Page 162: Load Encroachment

    The element operates if the positive-sequence voltage is above a settable level and asserts its output signal that can be used to block selected protection elements such as distance or phase overcurrent. The following figure shows an effect of the Load Encroachment characteristics used to block the QUAD distance element. 5-78 L90 Line Differential Relay GE Power Management...
  • Page 163 LOAD ENCROACHMENT ANGLE: This setting specifies the size of the blocking region as shown on the LOAD ENCROACHMENT CHARACTERISTIC and applies to the positive sequence impedance. GE Power Management L90 Line Differential Relay 5-79...
  • Page 164: Current Elements

    „ MESSAGE The relay current elements menu consists of time overcurrent (TOC) , instantaneous overcurrent (IOC), and directional cur- rent elements. These elements can be used for tripping, alarming, or other functions. 5-80 L90 Line Differential Relay GE Power Management...
  • Page 165: Inverse Time Overcurrent Curve Characteristics

    5.5 GROUPED ELEMENTS 5.5.11 INVERSE TIME OVERCURRENT CURVE CHARACTERISTICS The inverse time overcurrent curves used by the TOC (time overcurrent) Current Elements are the IEEE, IEC, GE Type IAC, and I t standard curve shapes. This allows for simplified coordination with downstream devices. If however, none of these curve shapes is adequate, the FlexCurve™...
  • Page 166 4.827 38.634 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 5-82 L90 Line Differential Relay GE Power Management...
  • Page 167 1.835 1.067 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 Power Management L90 Line Differential Relay 5-83...
  • Page 168 = Pickup Current Setting = Characteristic Constant pickup = Reset Time in sec. (assuming energy capacity is 100% and RESET: Timed) RESET Table 5–20: GE TYPE IAC INVERSE TIME CURVE CONSTANTS IAC CURVE SHAPE IAC EXTREME INVERSE 0.0040 0.6379 0.6200 1.7872...
  • Page 169 T = Operate Time (sec.) TDM = Multiplier Setting I = Input Current = Pickup Current Setting pickup = Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed) RESET GE Power Management L90 Line Differential Relay 5-85...
  • Page 170: Phase Current

    (see the figure below); the pickup level is calculated as ‘Mvr’ times the PICKUP setting. If the voltage restraint feature is dis- abled, the pickup level always remains at the setting value. 5-86 L90 Line Differential Relay GE Power Management...
  • Page 171 PHASE TOC1 C OP SETTING PHASE TOC1 PKP PHASE TOC1 VOLT RESTRAINT: PHASE TOC1 OP Enabled ACTUAL VALUE HARMONIC DERATING 827072A2.CDR FACTOR “1” if feature Disabled Figure 5–38: PHASE TOC1 SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-87...
  • Page 172 PHASE IOC1 C OP BLOCK-A: Off = 0 PHASE IOC1 PKP SETTING PHASE IOC1 OP PHASE IOC1 BLOCK-B: 827033A5.VSD Off = 0 SETTING PHASE IOC1 BLOCK-C: Off = 0 Figure 5–39: PHASE IOC1 SCHEME LOGIC 5-88 L90 Line Differential Relay GE Power Management...
  • Page 173 CTs and the line-line voltage from the VTs, based on the 90° or "quadrature" connection. If there is a requirement to supervise overcurrent elements for flows in opposite directions, such as can happen through a bus-tie breaker, two phase directional elements should be programmed with opposite ECA settings. GE Power Management L90 Line Differential Relay 5-89...
  • Page 174 "No", the directional element allows tripping of phase overcurrent elements under directional control. 5-90 L90 Line Differential Relay GE Power Management...
  • Page 175 V < Min WHEN V MEM EXP: PH DIR1 BLK C 1sec MINIMUM PHASE B LOGIC SIMILAR TO PHASE A PHASE C LOGIC SIMILAR TO PHASE A 827078A3.CDR Figure 5–41: PHASE DIRECTIONAL SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-91...
  • Page 176: Neutral Current

    Once picked up, the NEUTRAL TOCx PKP output operand remains picked up until the thermal memory of the element resets completely. The PKP operand will not reset immediately after the operating current NOTE drops below the pickup threshold unless is set to "Instantaneous". NEUTRL TOCx RESET 5-92 L90 Line Differential Relay GE Power Management...
  • Page 177 RESET DELAY : SETTING NEUTRAL IOC1 DPO NEUTRAL IOC1 OP 3( _0 - K _1 ) PICKUP NEUTRAL IOC1 BLOCK: Off=0 SETTING NEUTRAL IOC1 SOURCE: 827035A4.CDR Figure 5–43: NEUTRAL IOC1 SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-93...
  • Page 178 The positive-sequence restraint allows for more sensitive settings by counterbalancing spurious zero-sequence currents resulting from: • System unbalances under heavy load conditions. • Transformation errors of Current Transformers (CTs) during double-line and three-phase faults. • Switch-off transients during double-line and three-phase faults. 5-94 L90 Line Differential Relay GE Power Management...
  • Page 179 "Measured VX", one-third of this voltage is used in place of V_0. NEUTRAL DIR OC1 POL VOLT The following figure explains the usage of the voltage polarized directional unit of the element. GE Power Management L90 Line Differential Relay 5-95...
  • Page 180 The ground current transformer must be connected between the ground NEUTRAL OC1 SOURCE and neutral point of an adequate local source of ground current. The ground current must be higher than 0.05 pu to be 5-96 L90 Line Differential Relay GE Power Management...
  • Page 181 This setting defines the pickup level for the overcurrent unit of the element in the reverse direction. When selecting this set- ting it must be kept in mind that the design uses a "positive-sequence restraint" technique for the "Calculated 3I0" mode of operation. GE Power Management L90 Line Differential Relay 5-97...
  • Page 182 5.5 GROUPED ELEMENTS 5 SETTINGS Figure 5–45: NEUTRAL DIRECTIONAL OC1 SCHEME LOGIC 5-98 L90 Line Differential Relay GE Power Management...
  • Page 183: Ground Current

    Once picked up, the GROUND TOCx PKP output operand remains picked up until the thermal memory of the element resets completely. The PKP operand will not reset immediately after the operating current NOTE drops below the pickup threshold unless is set to "Instantaneous". GROUND TOCx RESET GE Power Management L90 Line Differential Relay 5-99...
  • Page 184 The conversion range of a standard channel is from 0.02 to 46 NOTE times the CT rating. The conversion range of a sensitive channel is from 0.002 to 4.6 times the CT rating. 5-100 L90 Line Differential Relay GE Power Management...
  • Page 185: Negative Sequence Current

    Once picked up, the NEG SEQ TOCx PKP output operand remains picked up until the thermal memory of the element resets completely. The PKP operand will not reset immediately after the operating current NOTE drops below the pickup threshold unless is set to "Instantaneous". NEG SEQ TOCx RESET GE Power Management L90 Line Differential Relay 5-101...
  • Page 186 SETTING NEG SEQ IOC1 DPO NEG SEQ IOC1 OP _2 - K _1 PICKUP NEG SEQ IOC1 BLOCK: Off=0 SETTING NEG SEQ IOC1 SOURCE: 827058A5.CDR Figure 5–49: NEGATIVE SEQUENCE IOC1 SCHEME LOGIC 5-102 L90 Line Differential Relay GE Power Management...
  • Page 187: Breaker Failure

    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 Power Management L90 Line Differential Relay 5-103...
  • Page 188 5-104 L90 Line Differential Relay GE Power Management...
  • Page 189 This setting is used to select the breaker failure operating mode: single or three pole. BF1 USE AMP SUPV: If set to Yes, the element will only be initiated if current flowing through the breaker is above the supervision pickup level. GE Power Management L90 Line Differential Relay 5-105...
  • Page 190 1-Pole breaker failure scheme, this operand represents the protected breaker auxiliary switch contact on pole A. This may be a multiplied contact. BF1 BREAKER TEST ON: This setting is used to select the FlexLogic™ operand that represents the breaker In-Service/Out-of-Service switch set to the Out-of-Service position. 5-106 L90 Line Differential Relay GE Power Management...
  • Page 191 The overcurrent detectors have ganged settings. Upon operation of the breaker failure element for a single pole trip command, a 3-pole trip command should be given via output operand "BF1 TRIP OP". GE Power Management L90 Line Differential Relay 5-107...
  • Page 192 BF1 SOURCE : Initiated Ph C PICKUP : TO SHEET 2 OF 2 PICKUP PICKUP PICKUP TO SHEET 2 OF 2 (827070.CDR) 827069A5.CDR Figure 5–51: BREAKER FAILURE 1-POLE [INITIATE] (Sheet 1 of 2) 5-108 L90 Line Differential Relay GE Power Management...
  • Page 193 BF1 BKR POS2 FLEXLOGIC OPERAND Off=0 BKR FAIL 1 T3 OP SETTING BF1 BKR POS2 Off=0 SETTING BF1 BREAKER TEST ON: Off=0 827070A3.CDR Figure 5–52: BREAKER FAILURE 1-POLE (TIMERS) [Sheet 2 of 2] GE Power Management L90 Line Differential Relay 5-109...
  • Page 194 5.5 GROUPED ELEMENTS 5 SETTINGS Figure 5–53: BREAKER FAILURE 3-POLE [INITIATE] (Sheet 1 of 2) 5-110 L90 Line Differential Relay GE Power Management...
  • Page 195 5 SETTINGS 5.5 GROUPED ELEMENTS Figure 5–54: BREAKER FAILURE 3-POLE [TIMERS] (Sheet 2 of 2) GE Power Management L90 Line Differential Relay 5-111...
  • Page 196: Voltage Elements

    = Pickup Level pickup At 0% of pickup, the operating time equals the setting. UNDERVOLTAGE DELAY NOTE 20 30 80 90 100 110 % of V pickup Figure 5–55: INVERSE TIME UNDERVOLTAGE CURVES 5-112 L90 Line Differential Relay GE Power Management...
  • Page 197: Phase Voltage

    Source VT = Wye VCG or VCA Minimum FLEXLOGIC OPERAND SETTING PHASE UV1 PKP PHASE UV1 MODE: FLEXLOGIC OPERAND Phase to Ground Phase to Phase PHASE UV1 OP 827039A9.CDR Figure 5–56: PHASE UV1 SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-113...
  • Page 198 PHASE OV1 A OP PHASE OV1 B OP SETTING PHASE OV1 C OP PHASE OV1 BLOCK: PHASE OV1 PKP Off = 0 PHASE OV1 OP 827066A2.VSD Figure 5–57: PHASE OV1 SCHEME LOGIC 5-114 L90 Line Differential Relay GE Power Management...
  • Page 199: Neutral Voltage

    DELAY : FLEXLOGIC OPERANDS < 3V_0 Pickup NEUTRAL OV1 OP SETTING NEUTRAL OV1 DPO NEUTRAL OV1 SIGNAL NEUTRAL OV1 PKP SOURCE: ZERO SEQ VOLT (V_0) 827848A1.CDR Figure 5–58: NEUTRAL OVERVOLTAGE SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-115...
  • Page 200: Auxiliary Voltage

    AUX UV1 PKP AUX UV1 DPO SETTING SETTING AUX UV1 OP AUX UV1 MINIMUM AUX UV1 SIGNAL VOLTAGE: SOURCE: < Vx Minimum AUX VOLT Vx 827849A2.CDR Figure 5–59: AUXILIARY UNDERVOLTAGE SCHEME LOGIC 5-116 L90 Line Differential Relay GE Power Management...
  • Page 201 Off=0 DELAY : FLEXLOGIC OPERANDS < Vx Pickup AUX OV1 OP SETTING AUX OV1 DPO AUX OV1 SIGNAL AUX OV1 PKP SOURCE: AUXILIARY VOLT (Vx) 827836A2.CDR Figure 5–60: AUXILIARY OVERVOLTAGE SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-117...
  • Page 202: Supervising Elements

    This setting is used to select a FlexLogic™ operand which will activate the output of the Disturbance Detector upon events (such as frequency or voltage change) not accompanied by a current change. 5-118 L90 Line Differential Relay GE Power Management...
  • Page 203 OR LOWER) IN 0.02 pu STEPS USING THE FLEXLOGIC OPERAND SETTING HIGHEST VALUE OF 50DD SV DD LOGIC I_0 AND I_2. SEAL-IN: Off=0 SETTING DD NON-CURRENT SUPV: Off=0 827044A6.CDR Figure 5–61: DISTURBANCE DETECTOR SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-119...
  • Page 204 This setting is used to select a FlexLogic™ operand that blocks operation of the element. OPEN POLE CURRENT SOURCE: This setting is used to select the source for the current for the element. 5-120 L90 Line Differential Relay GE Power Management...
  • Page 205 3-pole tripping mode is used, this setting should be thoroughly considered. It should comprise the reset time of the operat- ing elements it used in conjunction with the breaker opening time and breaker auxiliary contacts discrepancy with the main contacts. GE Power Management L90 Line Differential Relay 5-121...
  • Page 206 SETTING OPEN POLE VOLTAGE SOURCE: DELTA VA < 75% Nominal VAG or VBG or VB < 75% Nominal VCG or VC < 75% Nominal 827047A6.CDR Figure 5–62: OPEN POLE DETECTOR SCHEME LOGIC 5-122 L90 Line Differential Relay GE Power Management...
  • Page 207 87L TRIP SUPV: This setting is used to assign a trip supervising element. FlexLogic™ operand 50DD SV is recommended (the element has to be enabled); otherwise elements like IOC, Distance, etc. can be used. GE Power Management L90 Line Differential Relay 5-123...
  • Page 208 This setting is used to enable/disable seal-in of the trip signal by measurement of the current flowing. 87L TRIP SEAL-IN PICKUP: This setting is used to select a pickup setting of the current seal-in function. Figure 5–63: 87L TRIP SCHEME LOGIC 5-124 L90 Line Differential Relay GE Power Management...
  • Page 209: Control Elements

    The assigned VIRTUAL OUTPUT 1 operand is used to control the ON state of a particular settings group. Figure 5–64: EXAMPLE FLEXLOGIC™ CONTROL OF A SETTINGS GROUP GE Power Management L90 Line Differential Relay 5-125...
  • Page 210: Synchrocheck

    This setting selects the maximum frequency difference in ‘Hz’ between the two sources. A frequency difference between the two input voltage systems below this value is within the permissible limit for synchronism. 5-126 L90 Line Differential Relay GE Power Management...
  • Page 211 If using a single CT/VT module with both phase voltages and an auxiliary voltage, ensure that only the auxiliary voltage is programmed in one of the Sources to be used for synchrocheck. Exception: Synchronism cannot be checked between Delta connected phase VTs and a Wye connected auxiliary voltage. GE Power Management L90 Line Differential Relay 5-127...
  • Page 212 × × 30° If one or both sources are de-energized, the synchrocheck programming can allow for closing of the circuit breaker using undervoltage control to by-pass the synchrocheck measurements (Dead Source function). 5-128 L90 Line Differential Relay GE Power Management...
  • Page 213 5 SETTINGS 5.6 CONTROL ELEMENTS Figure 5–65: SYNCHROCHECK SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-129...
  • Page 214: Autoreclose

    4.000 s Range: FlexLogic™ operand AR1 ADD DELAY 1: MESSAGE Range: 0.00 to 655.35 s in steps of 0.01 AR1 DELAY 1: MESSAGE 0.000 s Range: FlexLogic™ operand AR1 ADD DELAY 2: MESSAGE 5-130 L90 Line Differential Relay GE Power Management...
  • Page 215 This offers enhanced setting flexibility using FlexLogic™ operands to turn the two additional timers "on" and "off". These operands may possibly include "AR x SHOT CNT =n", "SETTING GROUP ACT x", etc. GE Power Management L90 Line Differential Relay...
  • Page 216 This setting allows the autoreclose scheme to reset from Lockout if the breaker has been manually closed and stays closed for a preset time. In order for this setting to be effective, the next setting ( ) should be AR1 RESET LOCKOUT ON MANUAL CLOSE disabled. 5-132 L90 Line Differential Relay GE Power Management...
  • Page 217 "RECLOSE IN PROGRESS" state. If all conditions allowing a breaker clo- sure are not satisfied when this time expires, the scheme goes to "Lockout". This timer must be set to a delay less than the reset timer. NOTE GE Power Management L90 Line Differential Relay 5-133...
  • Page 218 5.6 CONTROL ELEMENTS 5 SETTINGS Figure 5–66: AUTORECLOSURE SCHEME LOGIC (Sheet 1 of 2) 5-134 L90 Line Differential Relay GE Power Management...
  • Page 219 5 SETTINGS 5.6 CONTROL ELEMENTS Figure 5–67: AUTORECLOSURE SCHEME LOGIC (Sheet 2 of 2) GE Power Management L90 Line Differential Relay 5-135...
  • Page 220 5.6 CONTROL ELEMENTS 5 SETTINGS Figure 5–68: SINGLE SHOT AUTORECLOSING SEQUENCE - PERMANENT FAULT 5-136 L90 Line Differential Relay GE Power Management...
  • Page 221: Digital Elements

    DIGITAL ELEMENT 01 INPUT: DIG ELEM 01 PKP Off = 0 DIG ELEM 01 OP INPUT = 1 SETTING DIGITAL ELEMENT 01 BLOCK: 827042A1.VSD Off = 0 Figure 5–69: DIGITAL ELEMENT SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-137...
  • Page 222 1 INPUT: MESSAGE Cont Op 1 VOff DIG ELEM 1 PICKUP MESSAGE DELAY: 0.200 s DIG ELEM 1 RESET MESSAGE DELAY: 0.100 s DIG ELEM 1 BLOCK: MESSAGE Cont Ip 1 Off 5-138 L90 Line Differential Relay GE Power Management...
  • Page 223 POWER SUPPLY (V DC) (OHMS) (WATTS) I = Current Monitor 1000 5000 V = Voltage Monitor 10000 25000 By-pass 25000 Resistor 50000 Trip Coil 827074A1.vsd DC– Figure 5–71: TRIP CIRCUIT EXAMPLE 2 GE Power Management L90 Line Differential Relay 5-139...
  • Page 224: Digital Counters

    Selects the FlexLogic™ operand for decrementing the counter. If an enabled DOWN input is received when the accumu- lated value is at the limit of -2,147,483,647 counts, the counter will rollover to +2,147,483,647. 5-140 L90 Line Differential Relay GE Power Management...
  • Page 225 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 5–72: DIGITAL COUNTER SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-141...
  • Page 226: Monitoring Elements

    100 milliseconds, which is expected to include the total arcing period. BKR 1 ARC AMP INIT: Selects the same output operand that is selected to operate the output relay used to trip the breaker. 5-142 L90 Line Differential Relay GE Power Management...
  • Page 227 ACTUAL VALUE CLEAR BREAKER 1 ARCING AMPS: BKR 1 ARCING AMP A NO=0 BKR 1 ARCING AMP B YES=1 BKR 1 ARCING AMP C 827071A2.CDR Figure 5–74: BREAKER ARCING CURRENT SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-143...
  • Page 228: Continuous Monitor

    SETTING CONT MONITOR V_SUPV: Off = 0 FLEXLOGIC OPERANDS CONT MONITOR OP CONT MONITOR PKP SETTING CONT MONITOR DPO CONT MONITOR V_OP: Off = 0 827049A3.vsd Figure 5–75: CONTINUOUS MONITOR SCHEME LOGIC 5-144 L90 Line Differential Relay GE Power Management...
  • Page 229: Ct Failure Detector

    CT FAIL 3I0 INPUT 1 PICKUP: This setting is used to select the pickup value for 3I_0 for the input 1 (main supervised CT source) of the relay. GE Power Management L90 Line Differential Relay 5-145...
  • Page 230 CT FAIL 3IO INPUT2: CT FAIL 3IO INPUT2 PKP: SRC2 3IO > PICKUP SETTING SETTING CT FAIL 3VO INPUT: CT FAIL 3VO INPUT: SRC1 3VO > PICKUP 827048A6.CDR Figure 5–76: CT FAILURE DETECTOR SCHEME LOGIC 5-146 L90 Line Differential Relay GE Power Management...
  • Page 231: Vt Fuse Failure

    I_1 < 0.05 p.u. FLEXLOGIC OPERAND FLEXLOGIC OPERAND FUSE FAIL SRC1 50DD OP SRC1 VT FUSE F OP SRC1 VT FUSE F DPO FAULT 827093A5.CDR Figure 5–77: VT FUSE FAIL SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-147...
  • Page 232: Pilot Schemes

    This setting enables the relay to cope with spurious receive signals. The delay should be set longer than the longest spuri- ous TX signal that can occur simultaneously with the zone 2 pickup. The selected delay will increase the response time of the scheme. 5-148 L90 Line Differential Relay GE Power Management...
  • Page 233 The POTT transmit signal (TX) should be appropriately interfaced with the signaling system by assigning the output FlexLogic™ operand (POTT TX) to an output contact. The Remote Output mechanism is another choice. GE Power Management L90 Line Differential Relay...
  • Page 234 Typically, the output operand should be programmed to initiate a trip, breaker fail, and autoreclose, and drive a user-programmable LED as per user application. Figure 5–78: POTT SCHEME LOGIC 5-150 L90 Line Differential Relay GE Power Management...
  • Page 235: Inputs / Outputs

    The update is performed at the beginning of the protection pass so all protection and control functions, as well as FlexLogic™ equations, are fed with the updated states of the contact inputs. GE Power Management L90 Line Differential Relay...
  • Page 236 Event Records menu, make the following settings changes: "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. 5-152 L90 Line Differential Relay GE Power Management...
  • Page 237: Virtual Inputs

    “Virtual Input 1 to OFF = 0” VIRTUAL INPUT 1 ID: (Flexlogic Operand) SETTING Virt Ip 1 VIRTUAL INPUT 1 TYPE: Latched Self - Reset 827080A2.CDR Figure 5–80: VIRTUAL INPUTS SCHEME LOGIC GE Power Management L90 Line Differential Relay 5-153...
  • Page 238: Uca Sbo Timer

    This can be realized in the UR using the ‘Cont Op 1 IOn’ FlexLogic™ operand to seal-in the Contact Output. For example, „ CONTACT OUTPUT H1 CONTACT OUTPUT H1 ID „ Cont Op 1 OUTPUT H1 OPERATE: MESSAGE OUTPUT H1 SEAL-IN: MESSAGE Cont Op 1 CONTACT OUTPUT H1 MESSAGE EVENTS: Enabled 5-154 L90 Line Differential Relay GE Power Management...
  • Page 239: Virtual Outputs

    The status of a remote device, where ‘Offline’ indicates ‘non-communicat- ing’, can be displayed. The GOOSE facility provides for 64 remote inputs and 32 remote outputs. GE Power Management L90 Line Differential Relay 5-155...
  • Page 240: Remote Inputs

    For more information on GOOSE specifications, see REMOTE INPUTS/OUTPUTS OVERVIEW in the REMOTE DEVICES section. NOTE 5-156 L90 Line Differential Relay GE Power Management...
  • Page 241: Remote Outputs Dna Bit Pairs

    Sync Closing SyncClsOff SyncClsOn Mode Report mode status of local GOOSE device Normal Test 28→32 Reserved For more information on GOOSE specifications, see REMOTE INPUTS/OUTPUTS OVERVIEW in the REMOTE DEVICES section. NOTE GE Power Management L90 Line Differential Relay 5-157...
  • Page 242: Remote Outputs Userst Bit Pairs

    DIRECT INPUT 1-1 DEFAULT completed startup or the local communications channel is declared to have failed. 5-158 L90 Line Differential Relay GE Power Management...
  • Page 243 L90 communication channel (same for 1-2...1-8) (87L is Enabled) SETTING DIRECT OUTPUT 1-1: FLEXLOGIC OPERAND (same for 1-2...1-8) Fail DIRECT I/P 1-1 Off (Flexlogic Operand) (same for 1-2...1-8) 831024A1.CDR Figure 5–81: DIRECT INPUTS/OUTPUTS LOGIC GE Power Management L90 Line Differential Relay 5-159...
  • Page 244: Resetting

    RESET OP (PUSHBUTTON), RESET OP (COMMS) or RESET OP (OPERAND) to identify the source of the command. The setting shown above selects the operand that will create the RESET OP (OPERAND) operand. 5-160 L90 Line Differential Relay GE Power Management...
  • Page 245: Transducer I/o

    Another example would be a Watt transducer with a span from –20 to +180 MW; in this case the MIN value would be –20 and the MAX value 180. Intermediate values between the MIN and MAX are scaled linearly. GE Power Management L90 Line Differential Relay...
  • Page 246: Rtd Inputs

    This ID is also used to reference the channel as the input parameter to features designed to measure this type of parameter. Selecting the type of RTD connected to the channel configures the channel. 5-162 L90 Line Differential Relay GE Power Management...
  • Page 247: Testing

    ON. The state of each contact output may be programmed as Disabled, Energized, De-energized, or Freeze. The Freeze option maintains the output contact in the state at which it was frozen. All contact output operations return to normal when all the settings for this feature are disabled. GE Power Management L90 Line Differential Relay 5-163...
  • Page 248: Channel Tests

    „ FUNCTION: No Range: 1, 2 LOCAL LOOPBACK MESSAGE CHANNEL NUMBER: 1 „ Range: Yes, No REMOTE LOOPBACK REMOTE LOOPBACK „ FUNCTION: No Range: 1, 2 REMOTE LOOPBACK MESSAGE CHANNEL NUMBER: 1 5-164 L90 Line Differential Relay GE Power Management...
  • Page 249: Actual Values

    87L DIFFERENTIAL „„ See page 6-11. METERING CURRENT SOURCE SRC 1 See page 6-12. SOURCE SRC 2 SOURCE SRC 3 SOURCE SRC 4 SOURCE SRC 5 SOURCE SRC 6 SYNCHROCHECK See page 6-15. GE Power Management L90 Line Differential Relay...
  • Page 250 EVENT RECORDS See page 6-20. OSCILLOGRAPHY See page 6-20. DATA LOGGER See page 6-20. MAINTENANCE See page 6-21. „„ ACTUAL VALUES MODEL INFORMATION „„ See page 6-22. PRODUCT INFO FIRMWARE REVISIONS See page 6-22. L90 Line Differential Relay GE Power Management...
  • Page 251: Status

    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 Power Management L90 Line Differential Relay...
  • Page 252: Direct 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. L90 Line Differential Relay GE Power Management...
  • Page 253: Autoreclose

    • The ‘SqNum’ number is obtained from the indicated Remote Device and is incremented whenever a GOOSE message is sent. This number will rollover to zero when a count of 4,294,967,295 is incremented. GE Power Management L90 Line Differential Relay...
  • Page 254: Channel Tests

    The result of the remote loopback test is displayed here. CHANNEL 1/2 LOOP DELAY: Displays the round trip channel delay (including loopback processing time of the remote relay) computed during a remote loopback test under normal relay operation, in milliseconds (ms). L90 Line Differential Relay GE Power Management...
  • Page 255: Digital Counters

    There are 256 FlexState bits available. The second line value indicates the state of the given FlexState bit. 6.2.13 ETHERNET Ö ÖØ PATH: ACTUAL VALUES STATUS ETHERNET „ Range: Fail, OK ETHERNET ETHERNET PRI LINK „ STATUS: OK Range: Fail, OK ETHERNET SEC LINK MESSAGE STATUS: OK GE Power Management L90 Line Differential Relay...
  • Page 256: Metering

    PF = Lag 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 L90 Line Differential Relay GE Power Management...
  • Page 257 ABC phase rotation: • ACB phase rotation: -- - V -- - V -- - V -- - V -- - V -- - V The above equations apply to currents as well. GE Power Management L90 Line Differential Relay...
  • Page 258 FREQUENCY AND PHASE REFERENCE The example above is illustrated in the following figure. SYSTEM VOLTAGES SYMMETRICAL COMPONENTS WYE VTs DELTA VTs 827844A1.CDR Figure 6–3: ILLUSTRATION OF THE UR CONVENTION FOR SYMMETRICAL COMPONENTS 6-10 L90 Line Differential Relay GE Power Management...
  • Page 259: Differential Current

    Terminal 1 refers to the communication channel 1 interface to a remote L90 at terminal 1. Terminal 2 refers to the communication channel 2 interface to a remote L90 at terminal 2. NOTE GE Power Management L90 Line Differential Relay 6-11...
  • Page 260: Sources

    0.000 0.0° „ PHASE VOLTAGE SRC 1 RMS Vag: „ SRC 1 0.000 SRC 1 RMS Vbg: MESSAGE 0.000 SRC 1 RMS Vcg: MESSAGE 0.000 SRC 1 PHASOR Vag: MESSAGE 0.000 0.0° 6-12 L90 Line Differential Relay GE Power Management...
  • Page 261 REAL POWER MESSAGE φc: 0.000 SRC 1 REACTIVE PWR MESSAGE 3φ: 0.000 SRC 1 REACTIVE PWR MESSAGE φa: 0.000 SRC 1 REACTIVE PWR MESSAGE φb: 0.000 SRC 1 REACTIVE PWR MESSAGE φc: 0.000 GE Power Management L90 Line Differential Relay 6-13...
  • Page 262 DMD IB MAX: MESSAGE 0.000 SRC 1 DMD IB DATE: MESSAGE 200/07/31 16:30:07 SRC 1 DMD IC: MESSAGE 0.000 SRC 1 DMD IC MAX: MESSAGE 0.000 SRC 1 DMD IC DATE: MESSAGE 200/07/31 16:30:07 6-14 L90 Line Differential Relay GE Power Management...
  • Page 263: Synchrocheck

    0.00 Hz The Actual Values menu for SYNCHROCHECK2 is identical to that of SYNCHROCHECK1. If a Synchrocheck Function setting is set to "Disabled", the corresponding Actual Values menu item will not be displayed. GE Power Management L90 Line Differential Relay 6-15...
  • Page 264: Tracking Frequency

    = maximum nominal primary RMS value of the +IN and –IN inputs BASE SYNCHROCHECK = maximum primary RMS value of all the sources related to the +IN and –IN inputs BASE (Max Delta Volts) 6-16 L90 Line Differential Relay GE Power Management...
  • Page 265: Transducer I/o

    RTD INPUT xx „ -50 °C Actual values for each RTD input channel that is Enabled are displayed with the top line as the programmed channel "ID" and the bottom line as the value. GE Power Management L90 Line Differential Relay 6-17...
  • Page 266: Records

    The currents from the local and remote systems can be parted between their fault (F) and pre-fault load (pre) components: eqn. 2 Apre and neglecting shunt parameters of the line: – eqn. 3 Apre 6-18 L90 Line Differential Relay GE Power Management...
  • Page 267 As fault locator algorithm is based on the single-end measurement method, in 3-terminal configuration the estimation of fault location may not be correct at all 3 terminals especially if fault occurs behind the line's NOTE tap respective to the given relay. GE Power Management L90 Line Differential Relay 6-19...
  • Page 268: Event Records

    It counts up at the defined sampling rate. If Data Logger channels are defined, then both values are static. ÖØ Refer to the menu for clearing data logger records. COMMANDS CLEAR RECORDS 6-20 L90 Line Differential Relay GE Power Management...
  • Page 269: Maintenance

    There is an identical Actual Value menu for each of the 2 Breakers. The values are in units of kA BKR 1 ARCING AMP ÖØ cycles. Refer to the menu for clearing breaker arcing current records. COMMANDS CLEAR RECORDS GE Power Management L90 Line Differential Relay 6-21...
  • Page 270: Product Information

    MESSAGE Date and time when the boot program was built. 2000/05/11 16:41:32 The shown data is illustrative only. A modification file number of 0 indicates that, currently, no modifications have been installed. 6-22 L90 Line Differential Relay GE Power Management...
  • Page 271: Commands And

    PATH: COMMANDS COMMANDS CLEAR RECORDS „„ Range: No, Yes COMMANDS CLEAR FAULT REPORTS? „„ CLEAR RECORDS Range: No, Yes CLEAR EVENT RECORDS? Range: No, Yes CLEAR OSCILLOGRAPHY? Range: No, Yes CLEAR DATA LOGGER? GE Power Management L90 Line Differential Relay...
  • Page 272: Set Date And Time

    UPDATING... PLEASE WAIT There is no impact if there have been no changes to the hardware modules. When an update does not occur, the following message will be shown. ORDER CODE NOT UPDATED L90 Line Differential Relay GE Power Management...
  • Page 273: Targets Menu

    • all other output relays are de-energized and are prevented from further operation • the faceplate IN SERVICE indicator is turned off • a RELAY OUT OF SERVICE event is recorded GE Power Management L90 Line Differential Relay...
  • Page 274 One or more GOOSE devices are Event driven. Occurs when a Check GOOSE setup OFFLINE not responding device programmed to receive GOOSE messages stops receiving message. Time is 1 to 60 sec. depending on GOOSE protocol packets. L90 Line Differential Relay GE Power Management...
  • Page 275: Introduction

    This creates a challenge when data is taken at remote locations. The GE approach to clock synchronization relies upon distributed synchronization. Distributed synchronization is accom- plished by synchronizing the clocks to each other rather than to a master clock. Clocks are phase synchronized to each other and frequency synchronized to the power system frequency.
  • Page 276: Removal Of Decaying Offset

    = phaselet index: there are N / P phaselets per cycle P = number of phaselets per cycle Imimic = k th sample of the mimic output, taken N samples per cycle L90 Line Differential Relay GE Power Management...
  • Page 277: Adaptive Strategy

    Thus, the restraint multiplier is an application adjustment that is used to achieve the desired balance between sensitivity and security. GE Power Management L90 Line Differential Relay...
  • Page 278 The adaptive elliptical restraint region provides the best statistical confidence and is more sensitive and more secure than the conventional approach. L90 Line Differential Relay GE Power Management...
  • Page 279: Clock Synchronization

    In all cases, an estimate of phase error is computed and used to automatically adapt the restraint region to compensate. Frequency tracking is provided that will accommodate any fre- quency shift normally encountered in power systems. GE Power Management L90 Line Differential Relay...
  • Page 280: Frequency Tracking And Phase Locking

    Tracking will resume as soon as there is current. L90 Line Differential Relay GE Power Management...
  • Page 281: Phase Detection

    •Phase angle deviation computed from currents is deemed valid whenever the currents are large enough, and when the deviation computed from the ping-pong information is below a fixed threshold (this threshold is ± half-cycle.) GE Power Management L90 Line Differential Relay...
  • Page 282 Delta must be positive. Theta could be positive or negative. Some care must be taken in the arithmetic to take into account possible roll over of any of the time stamps. If Ti-2 is greater than Ti-1, there was a roll over in the clock responsible for those two time stamps. L90 Line Differential Relay GE Power Management...
  • Page 283 Regarding timing of the computations, the latest available phase and frequency deviation information is furnished to the loop filter once per cycle in the case of a 64 Kbaud communications channel, and once every 3 cycles in the case of a 9600 baud communications channel. GE Power Management L90 Line Differential Relay...
  • Page 284: Phase Locking Filter

    Phase angle deviations from both current information and ping-pong information are always computed. The ping-pong algorithm has a wider range of validity, and is used to help decide which source of phase angle information is to be used by the filter. 8-10 L90 Line Differential Relay GE Power Management...
  • Page 285 There are 4 gains in the filter that must be selected once and for all as part of the design of the system. The gains are deter- mined by the time step of the integrators, and the desired time constants of the system as follows: repeat ----------------- - phase ---------------- - phase repeat ------------------------- - frequency GE Power Management L90 Line Differential Relay 8-11...
  • Page 286: Clock Implementation

    Sequence numbers are also used to match messages for the protection computation. Whenever a complete set of current measurements from all terminals with matching sequence numbers are available, the differential protection function is com- puted using that set of measurements. 8-12 L90 Line Differential Relay GE Power Management...
  • Page 287: Start-up

    8.1.17 ON-LINE ESTIMATE OF MEASUREMENT ERRORS GE's adaptive elliptical restraint characteristic is a good approximation to the cumulative effects of various sources of error in determining phasors. Sources of error include power system noise, transients, line charging current, current sensor gain, phase and saturation error, clock error, and asynchronous sampling.
  • Page 288: Ct Saturation Detection

    For long transmission lines the charging current is a significant factor, and should be computed to provide increased sensitivity to fault current. 8-14 L90 Line Differential Relay GE Power Management...
  • Page 289 In this application, the setting for the line capacitance should be the residual capacitance remaining after subtracting the shunt inductive reactance from the total capacitive reactance at the power system frequency. GE Power Management L90 Line Differential Relay...
  • Page 290: Differential Element Characteristics

    The state of this operand is based on the combination of con- ditions outlined above and it is recommended that it be used to enable backup protection if 87L is not available. 8-16 L90 Line Differential Relay GE Power Management...
  • Page 291 •At least one channel failed either at 3 Terminal or 2 Terminal-1 Channel systems. •Both channels failed at 2 Terminal-2 Channels PFFL fail or suspended, Channel ID failure detected on at least one channel at either system. GE Power Management L90 Line Differential Relay 8-17...
  • Page 292: Definitions

    I _L I _R ⋅ ⋅ ⋅ ⋅ ⋅ ⋅ ⋅ σ σ then 2 S 2 I _L 2 S 1 I _R – rest < > I _L I _R 8-18 L90 Line Differential Relay GE Power Management...
  • Page 293 > I _L I _R1 I _R2 , then ⋅ ⋅ ⋅ ⋅ -- - S 1 I _L I _R1 I _R2 – rest -- - σ σ σ rem1 rem2 GE Power Management L90 Line Differential Relay 8-19...
  • Page 294 The char- acteristic for 3 terminal mode is similar where both remote currents are combined together. 8-20 L90 Line Differential Relay GE Power Management...
  • Page 295 8 THEORY OF OPERATION 8.2 OPERATING CONDITION CALCULATIONS Figure 8–10: RESTRAINT CHARACTERISTICS GE Power Management L90 Line Differential Relay 8-21...
  • Page 296: Trip Decision Example

    OPERATE RESTRAINT BP=8, P=2, S1=30%, S2=50% BP=4, P=1, S1=30%, S2=50% BP=4, P=1, S1=20%, S2=40% OPERATE rem pu 831725A1.CDR Figure 8–11: SETTINGS IMPACT ON RESTRAINT CHARACTERISTIC 8-22 L90 Line Differential Relay GE Power Management...
  • Page 297: Calculation Example 1

    The CTs should be class TPX or TPY (class TPZ should only be used after discussion with both the manufacturer of the CT and GE Power Management) or IEC class 5P20 or better. The CT primary current rating should be somewhat higher than the maximum continuous current, but not extremely high relative to maximum load because the differential element minimum sensitivity setting is approximately 0.2 ×...
  • Page 298: Calculation Example 2

    = 0.008 + 0.52 = 0.528 Ω, which is less than the allowed 0.6 Ω, which is OK. The total Burden = R KNEEPOINT VOLTAGE CHECK: Use the procedure shown for Example Number 1 above. L90 Line Differential Relay GE Power Management...
  • Page 299: Introduction

    9.2 CURRENT DIFFERENTIAL (87L) SETTINGS 9.2.1 INTRODUCTION A program is available from the GE Power Management website that is quite helpful in selecting settings for the specific application. Checking the performance of selected element settings with respect to known NOTE power system fault parameters makes it relatively simple to choose the optimum settings for the applica- tion.
  • Page 300: Ct Tap

    = 10.0 x 500/5 = 1000 RELAY3 RELAY3 During on-load tests, the differential current at all terminals should be the same and generally equal to the charging current, if the TAP and CT ratio settings are chosen correctly. L90 Line Differential Relay GE Power Management...
  • Page 301: Description

    LV fault. For this system configuration, a 3-ter- minal L90 should be utilized; the third terminal is then fed from CT on the high side of the tapped transformer. GE Power Management L90 Line Differential Relay...
  • Page 302: Phase Distance

    The main purpose of this element is to operate for faults beyond the reach of the local Zone 1 element, and therefore a time delay must be used similar to the phase fault case. L90 Line Differential Relay GE Power Management...
  • Page 303: Description

    Typically, the output operand should be programmed to initiate a trip, breaker fail, and auto-reclose, and drive a user-programmable LED as per user application. GE Power Management L90 Line Differential Relay...
  • Page 304: Distance Settings On Series Compensated Lines

    0.6 + 0.5 + 0.7 = 1.8 pu if the bus-side (A) VTs are used For the RECEIVING BUS: 0.6 + 0.5 = 1.1 pu if the line-side (B) VTs are used 0.6 + 0.5 + 0.5 = 1.6 pu if the bus-side (A) VTs are used L90 Line Differential Relay GE Power Management...
  • Page 305: Description

    The above calculations should take into account the requirement for the pickup setting resulting from line charging currents. Certainly, a security factor must be applied to the above stability conditions. Alternatively, distance supervision can be con- sidered to prevent maloperation due to transformer load currents. GE Power Management L90 Line Differential Relay...
  • Page 306: Faults At The Lv Side Of The Transformer(s)

    = "Enabled"). Removing the zero-sequence component from the phase currents may cause the L90 to overtrip REMOVAL healthy phases on internal ground fault. This is not a limitation, as the single-pole tripping is not recommended for lines with tapped transformers. 9-10 L90 Line Differential Relay GE Power Management...
  • Page 307: Commissioning

    Trigger Position DNP Unsol Response Max Retries Trigger Source Unsol Response Dest Address AC Input Waveforms User Map for DNP Analogs FAULT REPORT Number of Sources in Analog List Fault Report Source GE Power Management L90 Line Differential Relay 10-1...
  • Page 308 Channel 3 Digital Channel 40 Channel 4 Digital Channel 41 Channel 5 Digital Channel 42 Channel 6 Digital Channel 43 Channel 7 Digital Channel 44 Channel 8 Digital Channel 45 Channel 9 10-2 L90 Line Differential Relay GE Power Management...
  • Page 309 LED 37 Type LED 14 Type LED 38 Operand LED 15 Operand LED 38 Type LED 15 Type LED 39 Operand LED 16 Operand LED 39 Type LED 16 Type LED 40 Operand GE Power Management L90 Line Differential Relay 10-3...
  • Page 310 Flex State Parameter 26 Flex State Parameter 73 Flex State Parameter 27 Flex State Parameter 74 Flex State Parameter 28 Flex State Parameter 75 Flex State Parameter 29 Flex State Parameter 76 10-4 L90 Line Differential Relay GE Power Management...
  • Page 311 Flex State Parameter 120 Flex State Parameter 167 Flex State Parameter 121 Flex State Parameter 168 Flex State Parameter 122 Flex State Parameter 169 Flex State Parameter 123 Flex State Parameter 170 GE Power Management L90 Line Differential Relay 10-5...
  • Page 312 Flex State Parameter 214 Disp 1 Item 2 Flex State Parameter 215 Disp 1 Item 3 Flex State Parameter 216 Disp 1 Item 4 Flex State Parameter 217 Disp 1 Item 5 10-6 L90 Line Differential Relay GE Power Management...
  • Page 313: Product Setup

    Disp 6 Item 4 Disp 6 Item 5 USER DISPLAY 7 Disp 7 Top Line Disp 7 Bottom Line Disp 7 Item 1 Disp 7 Item 2 Disp 7 Item 3 Disp 7 Item 4 GE Power Management L90 Line Differential Relay 10-7...
  • Page 314: System Setup

    GSource 5 round CT Phase VT ______ Ratio Source 5 Phase VT Auxiliary VT ______ Connection Source 5 Auxiliary VT Auxiliary VT ______ Secondary SIGNAL SOURCE 6 Auxiliary VT ______ Ratio Source 6 Name 10-8 L90 Line Differential Relay GE Power Management...
  • Page 315 Breaker 2 Pushbutton Control Breaker 2 Name Breaker 2 Mode Breaker 2 Open Breaker 2 Close Breaker 2 ΦA/3-Pole Breaker 2 ΦB Breaker 2 ΦC Breaker 2 Ext Alarm Breaker 2 Alarm Delay GE Power Management L90 Line Differential Relay 10-9...
  • Page 316: Flexcurve™ A

    15.0 0.48 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 10-10 L90 Line Differential Relay GE Power Management...
  • Page 317: Flexcurve™ B

    15.0 0.48 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 Power Management L90 Line Differential Relay 10-11...
  • Page 318: Flexlogic

    FlexLogic Entry 82 FlexLogic Entry 39 FlexLogic Entry 83 FlexLogic Entry 40 FlexLogic Entry 84 FlexLogic Entry 41 FlexLogic Entry 85 FlexLogic Entry 42 FlexLogic Entry 86 FlexLogic Entry 43 FlexLogic Entry 87 10-12 L90 Line Differential Relay GE Power Management...
  • Page 319 FlexLogic Entry 176 FlexLogic Entry 130 FlexLogic Entry 177 FlexLogic Entry 131 FlexLogic Entry 178 FlexLogic Entry 132 FlexLogic Entry 179 FlexLogic Entry 133 FlexLogic Entry 180 FlexLogic Entry 134 FlexLogic Entry 181 GE Power Management L90 Line Differential Relay 10-13...
  • Page 320 FlexLogic Entry 270 FlexLogic Entry 224 FlexLogic Entry 271 FlexLogic Entry 225 FlexLogic Entry 272 FlexLogic Entry 226 FlexLogic Entry 273 FlexLogic Entry 227 FlexLogic Entry 274 FlexLogic Entry 228 FlexLogic Entry 275 10-14 L90 Line Differential Relay GE Power Management...
  • Page 321 FlexLogic Entry 364 FlexLogic Entry 318 FlexLogic Entry 365 FlexLogic Entry 319 FlexLogic Entry 366 FlexLogic Entry 320 FlexLogic Entry 367 FlexLogic Entry 321 FlexLogic Entry 368 FlexLogic Entry 322 FlexLogic Entry 369 GE Power Management L90 Line Differential Relay 10-15...
  • Page 322 FlexLogic Entry 458 FlexLogic Entry 412 FlexLogic Entry 459 FlexLogic Entry 413 FlexLogic Entry 460 FlexLogic Entry 414 FlexLogic Entry 461 FlexLogic Entry 415 FlexLogic Entry 462 FlexLogic Entry 416 FlexLogic Entry 463 10-16 L90 Line Differential Relay GE Power Management...
  • Page 323 FlexLogic Entry 506 FLEXLOGIC TIMER 11 FlexLogic Entry 507 FlexLogic Timer 11 Type FlexLogic Entry 508 FlexLogic Timer 11 Pickup Delay FlexLogic Entry 509 FlexLogic Timer 11 Dropout Delay FlexLogic Entry 510 GE Power Management L90 Line Differential Relay 10-17...
  • Page 324 FlexElement 1 Input Mode FlexLogic Timer 22 Dropout Delay FlexElement 1 Comp Mode FLEXLOGIC TIMER 23 FlexElement 1 Direction FlexLogic Timer 23 Type FlexElement 1 Pickup FlexLogic Timer 23 Pickup Delay FlexElement 1 Hysteresis 10-18 L90 Line Differential Relay GE Power Management...
  • Page 325 FlexElement 6 Rst Delay FlexElement 4 Function FlexElement 6 Blk FlexElement 4 Name FlexElement 6 Target FlexElement 4 +IN FlexElement 6 Events FlexElement 4 –IN FLEXLELEMENT 7 FlexElement 4 Input Mode FlexElement 7 Function GE Power Management L90 Line Differential Relay 10-19...
  • Page 326 FlexElement 8 Direction FlexElement 8 Pickup FlexElement 8 Hysteresis FlexElement 8 dt Unit FlexElement 8 dt FlexElement 8 Pkp Delay FlexElement 8 Rst Delay FlexElement 8 Blk FlexElement 8 Target FlexElement 8 Events 10-20 L90 Line Differential Relay GE Power Management...
  • Page 327: Grouped Elements

    Memory Duration Power Swing Function PHASE DISTANCE Z2 Power Swing Source Phs Dist Z2 Function Power Swing Mode Phs Dist Z2 Direction Power Swing Supv Phs Dist Z2 Shape Power Swing Fwd Reach GE Power Management L90 Line Differential Relay 10-21...
  • Page 328 Neutral TOC1 Events PHASE TOC2 NEUTRAL TOC2 Phase TOC2 Function Neutral TOC2 Function Phase TOC2 Signal Source Neutral TOC2 Signal Source Phase TOC2 Input Neutral TOC2 Input Phase TOC2 Pickup Neutral TOC2 Pickup 10-22 L90 Line Differential Relay GE Power Management...
  • Page 329 Ground TOC2 Reset Neg. Seq. IOC1 Pickup Delay Ground TOC2 Block Neg. Seq. IOC1 Reset Delay Ground TOC2 Target Neg. Seq. IOC1 Block Ground TOC2 Events Neg. Seq. IOC1 Target Neg. Seq. IOC1 Events GE Power Management L90 Line Differential Relay 10-23...
  • Page 330 Neutral Dir OC1 Events BF1 Bkr POS1 ΦC NEUTRAL DIRECTIONAL OC2 BF1 Bkr POS2 ΦB Neutral Dir OC2 Function BF1 Bkr POS2 ΦC Neutral Dir OC2 Source Neutral Dir OC2 Polarizing BREAKER FAILURE 2 10-24 L90 Line Differential Relay GE Power Management...
  • Page 331 Aux OV1 Pickup Delay Phase UV1 Block Aux OV1 Reset Delay Phase UV1 Target Aux OV1 Block Phase UV1 Events Aux OV1 Target PHASE UNDERVOLTAGE 2 Aux OV1 Events Phase UV2 Function GE Power Management L90 Line Differential Relay 10-25...
  • Page 332 Open Pole Events 87L TRIP 87L Trip Function 87L Trip Source 87L Trip Mode 87L Trip Supervision 87L Trip Force 3-phase 87L Trip Seal-In 87L Trip Seal-In Pickup 87L Trip Target 87L Trip Events 10-26 L90 Line Differential Relay GE Power Management...
  • Page 333: Control Elements

    Dig Elem 2 Reset Delay Synchk2 Target Dig Elem 2 Block Synchk2 Events Digital Element 2 Target AUTORECLOSE 1 Digital Element 2 Events Function DIGITAL ELEMENT 3 Initiate Digital Element 3 Function GE Power Management L90 Line Differential Relay 10-27...
  • Page 334 DIGITAL ELEMENT 8 Dig Elem 13 Name Digital Element 8 Function Dig Elem 13 Input Dig Elem 8 Name Dig Elem 13 Pickup Delay Dig Elem 8 Input Dig Elem 13 Reset Delay 10-28 L90 Line Differential Relay GE Power Management...
  • Page 335 Counter 1 Freeze/Count Counter 5 Down DIGITAL COUNTER 2 Counter 5 Block Counter 2 Function Counter 5 Set to Preset Counter 2 Name Counter 5 Reset Counter 2 Units Counter 5 Freeze/Reset GE Power Management L90 Line Differential Relay 10-29...
  • Page 336 Gnd Directional O/C Forward Bkr 1 Arc Amp Init Bkr 1 Arc Amp Delay OPEN BREAKER ECHO Bkr 1 Arc Amp Limit Open Breaker Keying Bkr 1 Arc Amp Block Brk 1 Aux. Contact 10-30 L90 Line Differential Relay GE Power Management...
  • Page 337 Brk 1 Contact Supv. Brk 2 Aux. Contact Brk 2 Contact Supv. Open Breaker Keying PKP Delay Open Breaker Keying RST Delay Weak-Infeed Keying Weak-Infeed Supv Weak-Infeed PKP Dly Weak-Infeed RST Dly GE Power Management L90 Line Differential Relay 10-31...
  • Page 338: Inputs / Outputs

    10.6 INPUTS / OUTPUTS 10 COMMISSIONING 10.6 INPUTS / OUTPUTS 10.6.1 CONTACT INPUTS Table 10–8: CONTACT INPUTS CONTACT INPUT DEBNCE TIME EVENTS THRESHOLD 10-32 L90 Line Differential Relay GE Power Management...
  • Page 339: Virtual Inputs

    Virtual Input 27 Virtual Input 28 Virtual Input 29 Virtual Input 30 Virtual Input 31 Virtual Input 32 10.6.3 UCA SBO TIMER Table 10–10: UCA SBO TIMER UCA SBO TIMER UCA SBO Timeout GE Power Management L90 Line Differential Relay 10-33...
  • Page 340: Contact Outputs

    10.6 INPUTS / OUTPUTS 10 COMMISSIONING 10.6.4 CONTACT OUTPUTS Table 10–11: CONTACT OUTPUTS CONTACT OUTPUT OPERATE SEAL-IN EVENTS 10-34 L90 Line Differential Relay GE Power Management...
  • Page 341: Virtual Outputs

    10 COMMISSIONING 10.6 INPUTS / OUTPUTS 10.6.5 VIRTUAL OUTPUTS Table 10–12: VIRTUAL OUTPUTS (Sheet 1 of 2) Table 10–12: VIRTUAL OUTPUTS (Sheet 2 of 2) VIRTUAL EVENTS VIRTUAL EVENTS OUTPUT OUTPUT GE Power Management L90 Line Differential Relay 10-35...
  • Page 342: Remote Devices

    Remote Device 6 Remote Device 7 Remote Device 8 Remote Device 9 Remote Device 10 Remote Device 11 Remote Device 12 Remote Device 13 Remote Device 14 Remote Device 15 Remote Device 16 10-36 L90 Line Differential Relay GE Power Management...
  • Page 343: Remote Inputs

    Remote Input 22 Remote Input 23 Remote Input 24 Remote Input 25 Remote Input 26 Remote Input 27 Remote Input 28 Remote Input 29 Remote Input 30 Remote Input 31 Remote Input 32 GE Power Management L90 Line Differential Relay 10-37...
  • Page 344: Remote Outputs

    Table 10–15: REMOTE OUTPUTS (Sheet 1 of 2) Table 10–15: REMOTE OUTPUTS (Sheet 2 of 2) OUTPUT # OPERAND EVENTS OUTPUT # OPERAND EVENTS REMOTE OUTPUTS – DNA REMOTE OUTPUTS – UserSt 10-38 L90 Line Differential Relay GE Power Management...
  • Page 345: Direct Messaging

    Direct Output 2-4 Direct Input 2-5 Direct Output 2-5 Direct Input 2-6 Direct Output 2-6 Direct Input 2-7 Direct Output 2-7 Direct Input 2-8 Direct Output 2-8 10.6.10 RESETTING SETTING VALUE RESETTING Reset Operand GE Power Management L90 Line Differential Relay 10-39...
  • Page 346: Transducer I/o

    10.7 TRANSDUCER I/O 10 COMMISSIONING 10.7 TRANSDUCER I/O 10.7.1 DCMA INPUTS Table 10–17: DCMA INPUTS DCMA FUNCTION UNITS RANGE VALUES INPUT 10-40 L90 Line Differential Relay GE Power Management...
  • Page 347: Rtd Inputs

    10 COMMISSIONING 10.7 TRANSDUCER I/O 10.7.2 RTD INPUTS Table 10–18: RTD INPUTS RTD INPUT FUNCTION TYPE GE Power Management L90 Line Differential Relay 10-41...
  • Page 348: Testing

    Table 10–19: FORCE CONTACT INPUTS Table 10–20: FORCE CONTACT OUTPUTS FORCE CONTACT INPUT FORCE CONTACT OUTPUT 10.8.2 CHANNEL TESTS Table 10–21: CHANNEL TESTS SETTING VALUE LOCAL LOOPBACK Function Channel Number REMOTE LOOPBACK Function Channel Number 10-42 L90 Line Differential Relay GE Power Management...
  • Page 349: L90 Commissioning Tests

    15. If Channel 2 is used, make the following setting change and repeat Step 14 for Channel 2 as performed for channel 1: ÖØ ÖØ ÖØ "2" TESTING CHANNEL TESTS REMOTE LOOPBACK TEST REMOTE LOOPBACK CHANNEL NUMBER: GE Power Management L90 Line Differential Relay 10-43...
  • Page 350: Clock Synchronization Tests

    ACTUAL VALUES / STATUS / CHANNEL TESTS / PFLL STATUS: Reconnect the fiber Channel 1(2) Tx cable and in 60 to 120 seconds confirm that the relays have re-established com- munications again with the following status checks: 10-44 L90 Line Differential Relay GE Power Management...
  • Page 351: Current Differential

    ACTUAL VALUES / METERING / 87L DIFF CURRENT / IA DIFF •Repeat the above tests for phases B and C. •Restore the communication circuits to normal. GE Power Management L90 Line Differential Relay 10-45...
  • Page 352: Local-remote Relay Tests

    10 COMMISSIONING Download the L90 Test software from the GE Power Management website (www.GEindustrial.com/pm) or con- tact GE Power Management for information about the L90 current differential test program which allows the user to NOTE simulate different operating conditions for verifying correct responses of the relays during commissioning activities.
  • Page 353: Flexanalog

    SRC 2 Igd Angle SRC 2 Differential Ground Current Angle (°) 6656 SRC 1 Vag RMS SRC 1 Phase AG Voltage RMS (V) 6658 SRC 1 Vbg RMS SRC 1 Phase BG Voltage RMS (V) GE Power Management L90 Line Differential Relay...
  • Page 354 SRC 2 V_1 Mag SRC 2 Positive Sequence Voltage Magnitude (V) 6760 SRC 2 V_1 Angle SRC 2 Positive Sequence Voltage Angle (°) 6761 SRC 2 V_2 Mag SRC 2 Negative Sequence Voltage Magnitude (V) L90 Line Differential Relay GE Power Management...
  • Page 355 1 S1 S2 Angle Power Swing S1 S2 Angle (°) 9344 Local IA Mag Local IA Magnitude (A) 9346 Local IB Mag Local IB Magnitude (A) 9348 Local IC Mag Local IC Magnitude (A) GE Power Management L90 Line Differential Relay...
  • Page 356 39451 FlexElement 14 OpSig FlexElement 14 Actual 39453 FlexElement 15 OpSig FlexElement 15 Actual 39455 FlexElement 16 OpSig FlexElement 16 Actual 40960 Communications Group Communications Group 40971 Active Setting Group Current Setting Group L90 Line Differential Relay GE Power Management...
  • Page 357: Overview

    RTU PROTOCOLB.1 OVERVIEW B.1.1 INTRODUCTION The UR series relays support a number of communications protocols to allow connection to equipment such as personal computers, RTUs, SCADA masters, and programmable logic controllers. The Modicon Modbus RTU protocol is the most basic protocol supported by the UR. Modbus is available via RS232 or RS485 serial links or via ethernet (using the Mod- bus/TCP specification).
  • Page 358 19200 bps, and 300 µs at 115200 bps). Consequently, the transmitting device must not allow gaps between bytes longer than this interval. Once the dead time has expired without a new byte transmission, all slaves start listening for a new packet from the master except for the addressed slave. L90 Line Differential Relay GE Power Management...
  • Page 359: Algorithm

    Yes: G (+) A --> A and continue. Is j = 8? No: go to 5 Yes: continue i + 1 --> i Is i = N? No: go to 3 Yes: continue A --> CRC GE Power Management L90 Line Differential Relay...
  • Page 360: Function Codes

    1 to 127 though only a small subset is generally needed. The relay supports some of these functions, as summarized in the following table. Subsequent sections describe each function code in detail. FUNCTION CODE MODBUS DEFINITION GE POWER MANAGEMENT DEFINITION Read Holding Registers Read Actual Values or Settings Read Holding Registers...
  • Page 361: B.2.3 05h: Execute Operation

    DATA STARTING ADDRESS - lo DATA STARTING ADDRESS - lo DATA - hi DATA - hi DATA - lo DATA - lo CRC - lo CRC - lo CRC - hi CRC - hi GE Power Management L90 Line Differential Relay...
  • Page 362: Exception Responses

    PACKET FORMAT EXAMPLE (HEX) SLAVE ADDRESS SLAVE ADDRESS FUNCTION CODE FUNCTION CODE CRC - low order byte ERROR CODE CRC - high order byte CRC - low order byte CRC - high order byte L90 Line Differential Relay GE Power Management...
  • Page 363: File Transfers

    To read binary COMTRADE oscillography files, read the following filenames: • OSCnnnn.CFG • OSCnnn.DAT Replace "nnn" with the desired oscillography trigger number. For ASCII format, use the following file names • OSCAnnnn.CFG • OSCAnnn.DAT GE Power Management L90 Line Differential Relay...
  • Page 364: Modbus ® Password Operation

    COMMAND or SETTING password security access is restricted to the particular port or particular TCP/IP connection on which the entry was made. Passwords must be entered when accessing the relay through other ports or connections, and the passwords must be re-entered after disconnecting and re-connecting on TCP/IP. L90 Line Differential Relay GE Power Management...
  • Page 365: Memory Mapping

    ...Repeated for module number 24 0418 ...Repeated for module number 25 0419 ...Repeated for module number 26 041A ...Repeated for module number 27 041B ...Repeated for module number 28 041C ...Repeated for module number 29 GE Power Management L90 Line Differential Relay...
  • Page 366 ...Repeated for module number 4 1561 ...Repeated for module number 5 1565 ...Repeated for module number 6 1569 ...Repeated for module number 7 156D ...Repeated for module number 8 1571 ...Repeated for module number 9 B-10 L90 Line Differential Relay GE Power Management...
  • Page 367 ° F002 181C Positive Sequence Current Magnitude 0 to 999999.999 0.001 F060 181E Positive Sequence Current Angle -359.9 to 0 ° F002 181F Negative Sequence Current Magnitude 0 to 999999.999 0.001 F060 GE Power Management L90 Line Differential Relay B-11...
  • Page 368 F060 1000000000000 1C06 Phase C Real Power -1000000000000 to 0.001 F060 1000000000000 1C08 Three Phase Reactive Power -1000000000000 to 0.001 F060 1000000000000 1C0A Phase A Reactive Power -1000000000000 to 0.001 F060 1000000000000 B-12 L90 Line Differential Relay GE Power Management...
  • Page 369 Reserved (4 items) F001 1E10 ...Repeated for module number 2 1E20 ...Repeated for module number 3 1E30 ...Repeated for module number 4 1E40 ...Repeated for module number 5 1E50 ...Repeated for module number 6 GE Power Management L90 Line Differential Relay B-13...
  • Page 370 L90 Current Differential (Read Only) 2480 Local IA Magnitude 0 to 999999.999 0.001 F060 2482 Local IB Magnitude 0 to 999999.999 0.001 F060 2484 Local IC Magnitude 0 to 999999.999 0.001 F060 B-14 L90 Line Differential Relay GE Power Management...
  • Page 371 ...Repeated for module number 2 3034 ...Repeated for module number 3 3036 ...Repeated for module number 4 3038 ...Repeated for module number 5 303A ...Repeated for module number 6 303C ...Repeated for module number 7 GE Power Management L90 Line Differential Relay B-15...
  • Page 372 ...Repeated for module number 8 34F8 ...Repeated for module number 9 34F9 ...Repeated for module number 10 34FA ...Repeated for module number 11 34FB ...Repeated for module number 12 34FC ...Repeated for module number 13 B-16 L90 Line Differential Relay GE Power Management...
  • Page 373 0.5 to 10 F001 4051 Default Message Timeout 10 to 900 F001 4052 Default Message Intensity 0 to 3 F101 0 (25%) Communications (Read/Write Setting) 407E COM1 minimum response time 0 to 1000 F001 GE Power Management L90 Line Differential Relay B-17...
  • Page 374 IEC 60870-5-104 Protocol Cyclic Data Tx Period 1 to 65535 F001 40E4 IEC No. of Sources used in M_ME_NC_1 point list 1 to 6 F001 40E5 IEC Current Default Threshold 0 to 65535 F001 30000 B-18 L90 Line Differential Relay GE Power Management...
  • Page 375 ...Repeated for module number 14 429C ...Repeated for module number 15 429E ...Repeated for module number 16 42A0 ...Repeated for module number 17 42A2 ...Repeated for module number 18 42A4 ...Repeated for module number 19 GE Power Management L90 Line Differential Relay B-19...
  • Page 376 ...Repeated for module number 2 4510 ...Repeated for module number 3 Source Settings (Read/Write Setting) (6 modules) 4580 Source Name F206 "SRC 1 " 4583 Source Phase CT 0 to 63 F400 B-20 L90 Line Differential Relay GE Power Management...
  • Page 377 Synchrocheck (Read/Write Setting) (2 modules) 4780 Synchrocheck Function 0 to 1 F102 0 (Disabled) 4781 Synchrocheck V1 Source 0 to 5 F167 0 (SRC 1) 4782 Synchrocheck V2 Source 0 to 5 F167 1 (SRC 2) GE Power Management L90 Line Differential Relay B-21...
  • Page 378 ...Repeated for module number 5 5828 ...Repeated for module number 6 5830 ...Repeated for module number 7 5838 ...Repeated for module number 8 5840 ...Repeated for module number 9 5848 ...Repeated for module number 10 B-22 L90 Line Differential Relay GE Power Management...
  • Page 379 5A0A Reserved (6 items) 0 to 1 F001 5A10 ...Repeated for module number 2 5A20 ...Repeated for module number 3 5A30 ...Repeated for module number 4 5A40 ...Repeated for module number 5 GE Power Management L90 Line Differential Relay B-23...
  • Page 380 F103 0 (IEEE Mod Inv) 5D05 Ground TOC1 Multiplier 0 to 600 0.01 F001 5D06 Ground TOC1 Reset 0 to 1 F104 0 (Instantaneous) 5D07 Ground TOC1 Block 0 to 65535 F300 B-24 L90 Line Differential Relay GE Power Management...
  • Page 381 0 to 65535 F300 5F24 DD Events 0 to 1 F102 0 (Disabled) Differential 87L (Read/Write Grouped Setting) 6000 87L Function 0 to 1 F102 0 (Disabled) 6001 87L Block 0 to 65535 F300 GE Power Management L90 Line Differential Relay B-25...
  • Page 382 F001 6244 Autoreclose Manual Close 0 to 65535 F300 6245 Autoreclose Manual Reset from LO 0 to 65535 F300 6246 Autoreclose Reset Lockout if Breaker Closed 0 to 1 F108 0 (Off) B-26 L90 Line Differential Relay GE Power Management...
  • Page 383 65C2 Power Swing Mode 0 to 1 F513 0 (Two Step) 65C3 Power Swing Supv 0.05 to 30 0.001 F001 65C4 Power Swing Fwd Reach 0.1 to 500 ohms 0.01 F001 5000 GE Power Management L90 Line Differential Relay B-27...
  • Page 384 0 (Disabled) 7108 Reserved (8 items) 0 to 1 F001 Distance (Read/Write Grouped Setting) 7120 Distance Signal Source 0 to 5 F167 0 (SRC 1) 7121 Memory Duration 5 to 25 cycles F001 B-28 L90 Line Differential Relay GE Power Management...
  • Page 385 0 (Disabled) 7261 Phase DIR 1 Source 0 to 5 F167 0 (SRC 1) 7262 Phase DIR 1 Block 0 to 65535 F300 7263 Phase DIR 1 ECA 0 to 359 F001 GE Power Management L90 Line Differential Relay B-29...
  • Page 386 ...Repeated for module number 8 73C0 ...Repeated for module number 9 73D8 ...Repeated for module number 10 73F0 ...Repeated for module number 11 7408 ...Repeated for module number 12 7420 ...Repeated for module number 13 B-30 L90 Line Differential Relay GE Power Management...
  • Page 387 ...Repeated for module number 33 7750 ...Repeated for module number 34 7760 ...Repeated for module number 35 7770 ...Repeated for module number 36 7780 ...Repeated for module number 37 7790 ...Repeated for module number 38 GE Power Management L90 Line Differential Relay B-31...
  • Page 388 60 to 90 ° F001 7A51 Ground Distance Z2 Quad Left Blinder 0.02 to 500 Þ 0.01 F001 1000 7A52 Ground Distance Z2 Quad Left Blinder RCA 60 to 90 ° F001 B-32 L90 Line Differential Relay GE Power Management...
  • Page 389 ...Repeated for module number 8 9A11 ...Repeated for module number 9 9A13 ...Repeated for module number 10 9A15 ...Repeated for module number 11 9A17 ...Repeated for module number 12 9A19 ...Repeated for module number 13 GE Power Management L90 Line Differential Relay B-33...
  • Page 390 ...Repeated for module number 10 B140 ...Repeated for module number 11 B160 ...Repeated for module number 12 B180 ...Repeated for module number 13 B1A0 ...Repeated for module number 14 B1C0 ...Repeated for module number 15 B-34 L90 Line Differential Relay GE Power Management...
  • Page 391 ...Repeated for module number 23 C0B8 ...Repeated for module number 24 C0C0 ...Repeated for module number 25 C0C8 ...Repeated for module number 26 C0D0 ...Repeated for module number 27 C0D8 ...Repeated for module number 28 GE Power Management L90 Line Differential Relay B-35...
  • Page 392 ...Repeated for module number 77 C268 ...Repeated for module number 78 C270 ...Repeated for module number 79 C278 ...Repeated for module number 80 C280 ...Repeated for module number 81 C288 ...Repeated for module number 82 B-36 L90 Line Differential Relay GE Power Management...
  • Page 393 ...Repeated for module number 24 C810 ...Repeated for module number 25 C820 ...Repeated for module number 26 C830 ...Repeated for module number 27 C840 ...Repeated for module number 28 C850 ...Repeated for module number 29 GE Power Management L90 Line Differential Relay B-37...
  • Page 394 ...Repeated for module number 43 CF40 ...Repeated for module number 44 CF50 ...Repeated for module number 45 CF60 ...Repeated for module number 46 CF70 ...Repeated for module number 47 CF80 ...Repeated for module number 48 B-38 L90 Line Differential Relay GE Power Management...
  • Page 395 ...Repeated for module number 25 D420 ...Repeated for module number 26 D430 ...Repeated for module number 27 D440 ...Repeated for module number 28 D450 ...Repeated for module number 29 D460 ...Repeated for module number 30 GE Power Management L90 Line Differential Relay B-39...
  • Page 396 0 to 65535 F300 Remote Devices (Read/Write Setting) (16 modules) E000 Remote Device x ID F202 "Remote Device 1 " E00A ...Repeated for module number 2 E014 ...Repeated for module number 3 B-40 L90 Line Differential Relay GE Power Management...
  • Page 397 0 to 65535 F300 E601 Remote Output DNA x Events 0 to 1 F102 0 (Disabled) E602 Remote Output DNA x Reserved (2 items) 0 to 1 F001 E604 ...Repeated for module number 2 GE Power Management L90 Line Differential Relay B-41...
  • Page 398 ...Repeated for module number 16 E6C0 ...Repeated for module number 17 E6C4 ...Repeated for module number 18 E6C8 ...Repeated for module number 19 E6CC ...Repeated for module number 20 E6D0 ...Repeated for module number 21 B-42 L90 Line Differential Relay GE Power Management...
  • Page 399 -4096 to 4095 F002 F0A7 Transducer Channel to Calibrate Value -1.1 to 366.5 0.001 F004 F0A9 Transducer Channel to Calibrate Gain 0.8 to 1.2 0.0001 F060 F0AB Transducer Calibration Date 0 to 4294967295 F050 GE Power Management L90 Line Differential Relay B-43...
  • Page 400 -180 to 180 ° 0.01 F002 F819 Distance IbgZ Vbg Angle (4 items) -180 to 180 ° 0.01 F002 F81D Distance IcgZ Vcg Angle (4 items) -180 to 180 ° 0.01 F002 B-44 L90 Line Differential Relay GE Power Management...
  • Page 401 ...Repeated for module number 3 Auxiliary Undervoltage (Read/Write Grouped Setting) (3 modules) FC60 Auxiliary UV X Function 0 to 1 F102 0 (Disabled) FC61 Auxiliary UV X Signal Source 0 to 5 F167 0 (SRC 1) GE Power Management L90 Line Differential Relay B-45...
  • Page 402: Modbus ® Memory Map Data Formats

    12.35 kA. F100 F013 ENUMERATION: VT CONNECTION TYPE POWER_FACTOR PWR FACTOR (SIGNED 16 BIT INTEGER) 0 = Wye; 1 = Delta Positive values indicate lagging power factor; negative values indi- cate leading. B-46 L90 Line Differential Relay GE Power Management...
  • Page 403 ENUMERATION: OFF/ON ENUMERATION: OSCILLOGRAPHY MODE 0 = Off, 1 = On 0 = Automatic Overwrite, 1 = Protected F109 ENUMERATION: CONTACT OUTPUT OPERATION 0 = Self-reset, 1 = Latched, 2 = Disabled GE Power Management L90 Line Differential Relay B-47...
  • Page 404 0 = Phasor, 1 = RMS NTRL DIR NTRL DIR NEG SEQ F123 ENUMERATION: CT SECONDARY NEG SEQ GROUND IOC1 0 = 1 A, 1 = 5 A GROUND IOC2 GROUND IOC3 B-48 L90 Line Differential Relay GE Power Management...
  • Page 405 SETTING GROUP BLOCK SCHEME RESET POWER SWING OVERFREQ 1 SRC1 VT OVERFREQ 2 SRC2 VT OVERFREQ 3 SRC3 VT OVERFREQ 4 SRC4 VT UNDERFREQ 1 SRC5 VT UNDERFREQ 2 SRC6 VT UNDERFREQ 3 GE Power Management L90 Line Differential Relay B-49...
  • Page 406 0 = 31 x 8 cycles, 1 = 15 x 16 cycles, 2 = 7 x 32 cycles 3 = 3 x 64 cycles, 4 = 1 x 128 cycles F125 ENUMERATION: ACCESS LEVEL 0 = Restricted; 1 = Command, 2 = Setting, 3 = Factory Service B-50 L90 Line Differential Relay GE Power Management...
  • Page 407 UR_UINT32: 32 BIT ERROR CODE (F141 specifies bit number) A bit value of 0 = no error, 1 = error F144 ENUMERATION: FORCED CONTACT INPUT STATE ABCG 0 = Disabled, 1 = Open, 2 = Closed GE Power Management L90 Line Differential Relay B-51...
  • Page 408 0 = Forward, 1 = Reverse ENUMERATION: AUXILIARY VT CONNECTION TYPE 0 = Vn, 1 = Vag, 2 = Vbg, 3 = Vcg, 4 = Vab, 5 = Vbc, 6 = Vca B-52 L90 Line Differential Relay GE Power Management...
  • Page 409 0 = 100 Ohm Platinum, 1 = 120 Ohm Nickel, 0 = A, 1 = B, 2 = C, 3 = G 2 = 100 Ohm Nickel, 3 = 10 Ohm Copper GE Power Management L90 Line Differential Relay B-53...
  • Page 410 Elements 289 to 304 Elements 305 to 320 Elements 321 to 336 Elements 337 to 352 Elements 353 to 368 Elements 369 to 384 Elements 385 to 400 Elements 401 to 406 B-54 L90 Line Differential Relay GE Power Management...
  • Page 411 [56] ACTIVE SETTING GROUP (1-8) TEXT4 4 CHARACTER ASCII TEXT [62] MISCELLANEOUS EVENTS (See F146 for range) [64-127] ELEMENT STATES (Refer to Memory Map Element States Section) F208 TEXT2 2 CHARACTER ASCII TEXT GE Power Management L90 Line Differential Relay B-55...
  • Page 412 ENUMERATION POWER SWING TRIP MODE Operate Phase B Operate Phase C 0 = Delayed, 1 = Early F505 BITFIELD CONTACT OUTPUT STATE 0 = Contact State, 1 = Voltage Detected, 2 = Current Detected B-56 L90 Line Differential Relay GE Power Management...
  • Page 413 PRESS [ENTER] TO ADD AS DEFAULT Setting PRESS [ENTER] TO REMOVE MESSAGE Command PRESS [ENTER] TO BEGIN TEXT EDIT Factory Setting ENTRY MISMATCH - CODE NOT STORED PRESSED KEY IS INVALID HERE GE Power Management L90 Line Differential Relay B-57...
  • Page 414 B.4 MEMORY MAPPING APPENDIX B B-58 L90 Line Differential Relay GE Power Management...
  • Page 415: Uca/mms Overview

    PDIS (distance) • RREC (reclosing relay) • PDOC (directional overcurrent) • RSYN (synchronizing or synchronism-check relay) • PFRQ (frequency relay) • XCBR (circuit breaker) UCA data can be accessed through the "UCADevice" MMS domain. GE Power Management L90 Line Differential Relay...
  • Page 416 VARIABLE ACCESS SERVICES: • Read • Write • InformationReport • GetVariableAccessAttributes • GetNamedVariableListAttributes OPERATOR COMMUNICATION SERVICES: (none) SEMAPHORE MANAGEMENT SERVICES: (none) DOMAIN MANAGEMENT SERVICES: • GetDomainAttributes PROGRAM INVOCATION MANAGEMENT SERVICES: (none) EVENT MANAGEMENT SERVICES: (none) L90 Line Differential Relay GE Power Management...
  • Page 417 SBO Configuration Description for brick BO<n> Description for each point Actual instantiation of GCTL objects is as follows: GCTL1 = Virtual Inputs (32 total points – SI1 to SI32); includes SBO functionality. NOTE GE Power Management L90 Line Differential Relay...
  • Page 418 All MMXU.MX Description of ALL included MMXU.MX BrcbMX BasRCB Controls reporting of measurements Actual instantiation of MMXU objects is as follows: 1 MMXU per Source (as determined from the ‘product order code’) NOTE L90 Line Differential Relay GE Power Management...
  • Page 419 OBJECT NAME CLASS RWECS DESCRIPTION PhsVRat RATIO Primary/secondary winding ratio Description for brick Actual instantiation of vtRATO objects is as follows: 1 vtRATO per Source (as determined from the ‘product order code’). NOTE GE Power Management L90 Line Differential Relay...
  • Page 420: Uca Reporting

    2 minutes (120000 ms). This ensures that the UR will not abort the con- nection. If other MMS data is being polled on the same connection at least once every 2 minutes, this timeout will not apply. L90 Line Differential Relay GE Power Management...
  • Page 421: Iec 60870-5-104

    Address Field of the Link: Balanced Transmision Not Present (Balanced Transmission Only) Unbalanced Transmission One Octet Two Octets Structured Unstructured Frame Length (maximum length, number of octets): Not selectable in companion IEC 60870-5-104 standard GE Power Management L90 Line Differential Relay...
  • Page 422 <18> := Packed start events of protection equipment with time tag M_EP_TB_1 <19> := Packed output circuit information of protection equipment with time tag M_EP_TC_1 Ë <20> := Packed single-point information with status change detection M_SP_NA_1 L90 Line Differential Relay GE Power Management...
  • Page 423 <103> := Clock synchronization command (see Clause 7.6 in standard) C_CS_NA_1 <104> := Test command C_TS_NA_1 Ë <105> := Reset process command C_RP_NA_1 <106> := Delay acquisition command C_CD_NA_1 Ë <107> := Test command with time tag CP56Time2a C_TS_TA_1 GE Power Management L90 Line Differential Relay...
  • Page 424 Blank boxes indicate functions or ASDU not used. • ‘X’ if only used in the standard direction TYPE IDENTIFICATION CAUSE OF TRANSMISSION MNEMONIC <1> M_SP_NA_1 <2> M_SP_TA_1 <3> M_DP_NA_1 <4> M_DP_TA_1 <5> M_ST_NA_1 <6> M_ST_TA_1 <7> M_BO_NA_1 <8> M_BO_TA_1 L90 Line Differential Relay GE Power Management...
  • Page 425 M_ME_ND_1 <30> M_SP_TB_1 <31> M_DP_TB_1 <32> M_ST_TB_1 <33> M_BO_TB_1 <34> M_ME_TD_1 <35> M_ME_TE_1 <36> M_ME_TF_1 <37> M_IT_TB_1 <38> M_EP_TD_1 <39> M_EP_TE_1 <40> M_EP_TF_1 <45> C_SC_NA_1 <46> C_DC_NA_1 <47> C_RC_NA_1 <48> C_SE_NA_1 <49> C_SE_NB_1 GE Power Management L90 Line Differential Relay...
  • Page 426 C_RD_NA_1 <103> C_CS_NA_1 <104> C_TS_NA_1 <105> C_RP_NA_1 <106> C_CD_NA_1 <107> C_TS_TA_1 <110> P_ME_NA_1 <111> P_ME_NB_1 <112> P_ME_NC_1 <113> P_AC_NA_1 <120> F_FR_NA_1 <121> F_SR_NA_1 <122> F_SC_NA_1 <123> F_LS_NA_1 <124> F_AF_NA_1 <125> F_SG_NA_1 <126> F_DR_TA_1*) L90 Line Differential Relay GE Power Management...
  • Page 427 Long pulse duration (duration determined by a system parameter in the outstation) Ë Persistent output Ë Supervision of maximum delay in command direction of commands and setpoint commands Maximum allowable delay of commands and setpoint commands: 10 s GE Power Management L90 Line Differential Relay...
  • Page 428 Transmission of sequences of events Ë Transmission of sequences of recorded analog values File transfer in control direction: Ë Transparent file Background scan: Ë Background scan Acquisition of transmission delay: Acquisition of transmission delay L90 Line Differential Relay GE Power Management...
  • Page 429 The suitable selection of documents from RFC 2200 defined in this standard for given projects has to be chosen by the user of this standard. Ë Ethernet 802.3 Ë Serial X.21 interface Ë Other selection(s) from RFC 2200 (list below if selected) GE Power Management L90 Line Differential Relay...
  • Page 430: Points List

    SRC 1 Auxiliary Voltage Magnitude 2088 Remote2 IC Magnitude 2043 SRC 1 Auxiliary Voltage Angle degrees 2089 Differential Current IA Magnitude 2044 SRC 1 Zero Seq Voltage Magnitude 2090 Differential Current IB Magnitude D-10 L90 Line Differential Relay GE Power Management...
  • Page 431 Virtual Output States[1] 164 - 179 Virtual Output States[2] 180 - 195 Virtual Output States[3] 196 - 211 Contact Input States[0] 212 - 227 Contact Input States[1] 228 - 243 Contact Input States[2] GE Power Management L90 Line Differential Relay D-11...
  • Page 432 D.1 IEC 60870-5-104 POINTS LIST APPENDIX D D-12 L90 Line Differential Relay GE Power Management...
  • Page 433: Dnp E.1 Dnp Device Profile

    Document. Table E–1: DNP V3.00 DEVICE PROFILE (Sheet 1 of 3) (Also see the IMPLEMENTATION TABLE in the following section) Vendor Name: General Electric Power Management Device Name: UR Series Relay Highest DNP Level Supported: Device Function: Ë For Requests: Level 2 Master Ë...
  • Page 434 FlexLogic™. The On/Off times and Count value are ignored. "Pulse Off" and "Latch Off" operations put the appropriate Virtual Input into the "Off" state. "Trip" and "Close" operations both put the appropriate Virtual Input into the "On" state. L90 Line Differential Relay GE Power Management...
  • Page 435 Default Object: 16 Bits (Counter 8) Default Variation: 1 Ë 32 Bits (Counters 0 to 7, 9) Ë Point-by-point list attached Ë Other Value: _____ Ë Point-by-point list attached Sends Multi-Fragment Responses: Ë Ë GE Power Management L90 Line Differential Relay...
  • Page 436: E.2.1 Implementation Table

    Otherwise, static object requests sent with qualifiers 00, 01, 06, 07, or 08, will be responded with qualifiers 00 or 01 (for change- event objects, qualifiers 17 or 28 are always responded.) Note 3: Cold restarts are implemented the same as warm restarts – the UR is not restarted, but the DNP process is restarted. L90 Line Differential Relay GE Power Management...
  • Page 437 Otherwise, static object requests sent with qualifiers 00, 01, 06, 07, or 08, will be responded with qualifiers 00 or 01 (for change- event objects, qualifiers 17 or 28 are always responded.) Note 3: Cold restarts are implemented the same as warm restarts – the UR is not restarted, but the DNP process is restarted. GE Power Management L90 Line Differential Relay...
  • Page 438 Otherwise, static object requests sent with qualifiers 00, 01, 06, 07, or 08, will be responded with qualifiers 00 or 01 (for change- event objects, qualifiers 17 or 28 are always responded.) Note 3: Cold restarts are implemented the same as warm restarts – the UR is not restarted, but the DNP process is restarted. L90 Line Differential Relay GE Power Management...
  • Page 439 Otherwise, static object requests sent with qualifiers 00, 01, 06, 07, or 08, will be responded with qualifiers 00 or 01 (for change- event objects, qualifiers 17 or 28 are always responded.) Note 3: Cold restarts are implemented the same as warm restarts – the UR is not restarted, but the DNP process is restarted. GE Power Management L90 Line Differential Relay...
  • Page 440: E.3.1 Binary Input Points

    Virtual Output 27 Virtual Input 28 Virtual Output 28 Virtual Input 29 Virtual Output 29 Virtual Input 30 Virtual Output 30 Virtual Input 31 Virtual Output 31 Virtual Input 32 Virtual Output 32 L90 Line Differential Relay GE Power Management...
  • Page 441 Contact Input 65 Contact Input 15 Contact Input 66 Contact Input 16 Contact Input 67 Contact Input 17 Contact Input 68 Contact Input 18 Contact Input 69 Contact Input 19 Contact Input 70 GE Power Management L90 Line Differential Relay...
  • Page 442 Remote Input 7 Contact Output 21 Remote Input 8 Contact Output 22 Remote Input 9 Contact Output 23 Remote Input 10 Contact Output 24 Remote Input 11 Contact Output 25 Remote Input 12 E-10 L90 Line Differential Relay GE Power Management...
  • Page 443 NTRL DIR OC2 Element OP AR 5 Element OP GROUND IOC1 Element OP AR 6 Element OP GROUND IOC2 Element OP SYNC 1 Element OP GROUND TOC1 Element OP SYNC 2 Element OP GE Power Management L90 Line Differential Relay E-11...
  • Page 444 LED State 11 (FREQUENCY) LED State 12 (OTHER) LED State 13 (PHASE A) LED State 14 (PHASE B) LED State 15 (PHASE C) LED State 16 (NTL/GROUND) BATTERY FAIL PRI ETHERNET FAIL SEC ETHERNET FAIL E-12 L90 Line Differential Relay GE Power Management...
  • Page 445: E.3.2 Binary Output And Control Relay Output

    Virtual Input 22 Virtual Input 23 Virtual Input 24 Virtual Input 25 Virtual Input 26 Virtual Input 27 Virtual Input 28 Virtual Input 29 Virtual Input 30 Virtual Input 31 Virtual Input 32 GE Power Management L90 Line Differential Relay E-13...
  • Page 446: E.3.3 Counters

    Digital Counter 3 Events Since Last Clear Digital Counter 4 Note that a counter freeze command has no meaning for Digital Counter 5 counters 8 and 9. Digital Counter 6 Digital Counter 7 E-14 L90 Line Differential Relay GE Power Management...
  • Page 447: Analog Inputs

    Change Event Variation reported when variation 0 requested: 1 (Analog Change Event w/o Time) Change Event Scan Rate: defaults to 500 ms. Change Event Buffer Size: 800 Default Class for all Points: 1 GE Power Management L90 Line Differential Relay E-15...
  • Page 448 SRC 1 Auxiliary Voltage Angle Local IB Magnitude SRC 1 Zero Sequence Voltage Magnitude Local IC Magnitude SRC 1 Zero Sequence Voltage Angle Remote1 IA Magnitude SRC 1 Positive Sequence Voltage Magnitude Remote1 IB Magnitude E-16 L90 Line Differential Relay GE Power Management...
  • Page 449 FlexElement 7 Actual FlexElement 8 Actual FlexElement 9 Actual FlexElement 10 Actual FlexElement 11 Actual FlexElement 12 Actual FlexElement 13 Actual FlexElement 14 Actual FlexElement 15 Actual FlexElement 16 Actual Current Setting Group GE Power Management L90 Line Differential Relay E-17...
  • Page 450 E.3 DNP POINT LISTS APPENDIX E E-18 L90 Line Differential Relay GE Power Management...
  • Page 451: Change Notes

    Added PHASE DISTANCE, GROUND DISTANCE, POTT SIGNALING SCHEMES, and SERIES COMPENSATED LINES sections 10-1 Update Updated COMMISSIONING chapter to reflect changes to revision 2.9X firmware Update Updated MODBUS MEMORY MAP to reflect revision 2.9X firmware Added IEC 60870-5-104 INTEROPERABILITY DOCUMENT section GE Power Management L90 Line Differential Relay...
  • Page 452 Removed ESTIMATE OF PHASE UNCERTAINTY section 8-19 Added CT SATURATION DETECTION section Update Chapter 10: COMMISSIONING updated to reflect settings changes for revision 2.8X firmware B-11 Update MODBUS MEMORY MAP updated for version 2.8X firmware L90 Line Differential Relay GE Power Management...
  • Page 453 Table F–3: MAJOR UPDATES FOR L90 MANUAL-B4 (Sheet 2 of 2) PAGE CHANGE DESCRIPTION (B3) Update Updated DNP 3.0 DEVICE PROFILE DOCUMENT table Update Updated DNP 3.0 IMPLEMENTATION table Update Updated BINARY INPUT PONTS table GE Power Management L90 Line Differential Relay...
  • Page 454: Standard Abbreviations

    FSK ....frequency-shift keying NOM ....nominal FWD ....forward NTR ....neutral G ....generator O ....over GE ....General Electric OC, O/C ..overcurrent GND ....ground O/P, Op ..output GNTR ..... generator OP....operate L90 Line Differential Relay...
  • Page 455 ....with option SEQ....sequence WRT....with respect to SIR ....source impedance ratio SRC....source X .....reactance SSB ....single side band XDUCER..transducer SSEL ....session selector XFMR....transformer STATS .... statistics SUPN ..... supervision Z......impedance GE Power Management L90 Line Differential Relay...
  • Page 456: Tables And Figures

    Table: 5–18 IEC (BS) INVERSE TIME CURVE CONSTANTS ......................5-83 Table: 5–19 IEC CURVE TRIP TIMES (IN SECONDS)........................5-83 Table: 5–20 GE TYPE IAC INVERSE TIME CURVE CONSTANTS ....................5-84 Table: 5–21 IAC CURVE TRIP TIMES ............................. 5-84 Table: 5–22 I t CURVE TRIP TIMES..............................
  • Page 457: List Of Figures

    Figure 3–27: BACK TO BACK CONNECTION ..........................3-24 Figure 3–28: CONNECTION TO HIGHER ORDER SYSTEM ......................3-24 Figure 3–29: RS422 INTERFACE CONFIGURATION ........................3-25 Figure 3–30: TYPICAL PIN INTERCONNECTION BETWEEN TWO RS422 INTERFACES ............3-25 GE Power Management L90 Line Differential Relay...
  • Page 458 Figure 5–51: BREAKER FAILURE 1-POLE [INITIATE] (Sheet 1 of 2) ................... 5-108 Figure 5–52: BREAKER FAILURE 1-POLE (TIMERS) [Sheet 2 of 2] .................... 5-109 Figure 5–53: BREAKER FAILURE 3-POLE [INITIATE] (Sheet 1 of 2) ................... 5-110 L90 Line Differential Relay GE Power Management...
  • Page 459 Figure 8–9: 3-TERMINAL TRANSMISSION LINE SINGLE PHASE MODEL FOR COMPENSATION ..........8-15 Figure 8–10: RESTRAINT CHARACTERISTICS..........................8-21 Figure 8–11: SETTINGS IMPACT ON RESTRAINT CHARACTERISTIC ..................8-22 Figure 9–1: TYPICAL HV LINE CONFIGURATION..........................9-5 Figure 9–2: SAMPLE SERIES COMPENSATED SYSTEM........................ 9-8 GE Power Management L90 Line Differential Relay...
  • Page 460: Warranty

    24 months from date of shipment from factory. In the event of a failure covered by warranty, GE Power Management will undertake to repair or replace the relay providing the warrantor determined that it is defective and it is returned with all transportation charges prepaid to an authorized service centre or the factory.
  • Page 461 CHARGING CURRENT COMPENSATION ....5-29, 8-14 settings ............... 5-117 CIRCUIT MONITORING APPLICATIONS ......5-138 specifications ..............2-15 CLEANING ............... 2-20 AUXILIARY UNDERVOLTAGE CLEAR RECORDS ............. 7-1 commissioning ............10-25 CLOCK logic ................5-116 GE Power Management L90 Line Differential Relay...
  • Page 462 ............... 5-144 CONTROL ELEMENTS ........... 5-125 see entry for DISTURBANCE DETECTOR CONTROL POWER DEFINITE TIME CURVE ........5-85, 5-112 connection diagram ............3-7 DEMAND METERING description ............... 3-8 actual values ..............6-14 specifications ..............2-18 L90 Line Differential Relay GE Power Management...
  • Page 463 FAST TRANSIENT TESTING ..........2-20 quad characteristic ..........5-62, 5-63 FAULT DETECTION ............8-3 settings ................. 5-60 FAULT LOCATOR DISTURBANCE DETECTOR logic ................6-19 commissioning ............10-26 Modbus registers ............B-14 internal ................. 5-27 GE Power Management L90 Line Differential Relay...
  • Page 464 FLEX STATE PARAMETERS actual values ..............6-7 G.703 ............ 3-22, 3-23, 3-24, 3-28 commissioning ............... 10-4 GE TYPE IAC CURVES ............5-84 Modbus registers .........B-10, B-15, B-33 GOMSFE ................C-1 settings ................. 5-21 GOOSE ......5-13, 5-155, 5-156, 5-157, 5-158, 6-5 specifications ..............
  • Page 465 MODIFICATION FILE NUMBER ........6-22 LINE DIFFERENTIAL ELEMENTS ........5-53 MODULES LINE LENGTH ..............5-30 communications ............. 3-17 LINE PICKUP contact inputs/outputs ........3-11, 3-13, 3-14 commissioning ............10-21 CT ................... 3-9 logic ................5-59 GE Power Management L90 Line Differential Relay...
  • Page 466 PFLL STATUS ..............6-7 OPEN POLE DETECTOR PHASE ................2-15 commissioning ............. 10-26 PHASE ANGLE METERING ..........6-9 logic ................5-122 PHASE CURRENT METERING .........6-12 Modbus registers ............B-26 PHASE DETECTION ............8-7 settings ............... 5-120 L90 Line Differential Relay GE Power Management...
  • Page 467 ROLLING DEMAND ............5-19 description ..............3-7 RS232 low range ..............2-18 configuration ..............1-6 specifications ..............2-18 specifications ..............2-18 POWER SWING BLOCKING ........2-15, 5-73 wiring ................3-17 POWER SWING DETECT RS422 commissioning ............10-21 GE Power Management L90 Line Differential Relay...
  • Page 468 DNA2 assignments ............5-157 actual values ..............6-15 MIC ................C-3 commissioning ............. 10-27 overview ................. C-1 logic ................5-129 PICS ................C-2 Modbus registers ............B-14 remote device settings ..........5-155 viii L90 Line Differential Relay GE Power Management...
  • Page 469 ..............2-16 WEBSITE ................1-1 USERST-1 BIT PAIR ............5-158 WIRING DIAGRAM ............. 3-6 VAR-HOURS ............2-17, 6-14 ZERO SEQUENCE CORE BALANCE ........3-9 VIBRATION TESTING ............2-20 ZERO-SEQUENCE CURRENT REMOVAL ......5-30 VIRTUAL INPUTS GE Power Management L90 Line Differential Relay...
  • Page 470 INDEX L90 Line Differential Relay GE Power Management...

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