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GE MDP Instruction Manual

Digital time overcurrent relay
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GE Power Management
MDP
Digital Time Overcurrent Relay
Instruction Manual
MDP Revision: Rev. D
Manual P/N: GEK-100682D
Copyright © 2000 GE Power Management
GE Power Management
215 Anderson Avenue, Markham, Ontario
Canada L6E 1B3
Tel: (905) 294-6222 Fax: (905) 294-8512
Manufactured under an
Internet: http://www.GEindustrial.com/pm
ISO9002 Registered system.
Courtesy of NationalSwitchgear.com

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  • Page 1 GE Power Management Digital Time Overcurrent Relay Instruction Manual MDP Revision: Rev. D Manual P/N: GEK-100682D Copyright © 2000 GE Power Management GE Power Management 215 Anderson Avenue, Markham, Ontario Canada L6E 1B3 Tel: (905) 294-6222 Fax: (905) 294-8512 Manufactured under an Internet: http://www.GEindustrial.com/pm...
  • Page 2 Courtesy of NationalSwitchgear.com...
  • Page 3 These instructions do not purport to cover all details or variations in equipment nor provide for every possible contingency to be met in connection with instal- lation, operation, or maintenance. Should further information be desired or should particular problems arise which are not covered sufficiently for the pur- chaser’s purpose, the matter should be referred to the General Electric Company.
  • Page 4 Courtesy of NationalSwitchgear.com...

  • Page 5: Table Of Contents

    PHASE PICKUP CALIBRATION VERIFICATION ........5-1 VERIFICATION OF OPERATING TIME..........5-2 VERIFICATION OF TIME DIAL .............. 5-2 INSTANTANEOUS UNIT ................5-3 VERIFICATION OF PICKUP ..............5-3 VERIFICATION OF OPERATING TIME..........5-3 GROUND UNIT..................5-3 GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...
  • Page 6 EVENT HANDLING ................... 7-6 A. MDP FAQ FREQUENTLY ASKED QUESTIONS ............A-1 B. CHANGE NOTES REVISION HISTORY .................B-1 ADDITIONS TO MDP MANUAL ..............B-1 CHANGES TO MDP MANUAL ..............B-2 MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...

  • Page 7: Product Description

    Breaker operation (RS232 and RS485 versions only) The MDP™ series relays include four measuring units, one for each of the three phase currents and an addi- tional one for ground or residual current. Each of the four measuring units includes a time and an instanta- neous overcurrent unit.

  • Page 8: Order Codes

    24 to 48 V DC 48 to 125 V DC, 35 to 120 V AC 110 to 250 V DC, 85 to 240 V AC 00000 Reserved Revision Level MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...
  • Page 9 ZERO SEQUENCE GROUND SENSING CONNECTION CIRCUIT BREAKER CONTROL POWER TRIP COIL POWER SUPPLY CURRENT INPUTS SWITCHGEAR GE Power Management GROUND BUS SHIELDED TWISTED PAIR RS232 707754A3.CDR Figure 1–2: TYPICAL WIRING DIAGRAM GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...

  • Page 10: Application

    CURRENTS on pages 4–2 and 4–3. The pickup setting of the MDP time unit should be chosen so that it operates for all short circuits in the pro- tected zone and, when possible, also provides backup protection for short circuits in the immediately adjacent system element.

  • Page 11: Interference Suppression Ground Connection

    Contact converter input CC1 and the output select switch of the MDP allow a zone selective interlocking of the MDP relays. This scheme provides instantaneous operation (with a minimum time delay) of the upstream relay for faults between the upstream and downstream relays.

  • Page 12: Technical Specifications

    50 W resistive with a maximum of 2 A and 300 V DC Continuous: 5 A, with 300 V DC maximum Frequency range: 25 to 70 Hz (note: the MDP responds to RMS values of harmonics to 600 Hz) MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...

  • Page 13: Ranges And Settings

    NOTE All values are adjusted with DIP switches located at the front of the relay, except the communications address, which is located on the rear of the cradle. NOTE GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...
  • Page 14 1 INTRODUCTION GEK-100682D MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...

  • Page 15: Inputs

    2. Before continuing, connect an approved wrist grounding strap to ground. This discharges any static elec- tricity in your body that could damage the electronics of the MDP relay. A wrist strap is provided with the communications card kit. The wrist strap must provide a "safe" high resistance to ground.
  • Page 16 Figure 2–1: DIGITAL INPUT/COMMUNICATIONS BOARD 7. Reassemble the MDP relay by engaging the board spacers of the lowest board (digital input/communica- tions board) into the processor board above it. Align the NOMEX shield on the solder side of the settings board.

  • Page 17: Measurement

    The dropout to pickup ratio is not less than 95%, based on the actual operating value. The MDP relay incorporates five inverse time curves and four definite times. The curve within a family is selected by the time dial. The characteristic curves for the MDP relay correspond approximately as follows.

  • Page 18: A 51 Inverse (5 A Rated Relays)

    For all the above equations: P = multiple of pickup TOC Time Dial Setting Time Dial = for 5 A rated unit -------------------------------------------- - = Time Dial Setting for 1 A rated unit MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...
  • Page 19 GEK-100682D 2 OPERATING PRINCIPLES Figure 2–4: INVERSE TIME CURVE GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...
  • Page 20 2 OPERATING PRINCIPLES GEK-100682D Figure 2–5: LONG INVERSE TIME CURVE MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...
  • Page 21 GEK-100682D 2 OPERATING PRINCIPLES Figure 2–6: VERY INVERSE TIME CURVE GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...
  • Page 22 2 OPERATING PRINCIPLES GEK-100682D Figure 2–7: EXTREMELY INVERSE TIME CURVE MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...
  • Page 23 GEK-100682D 2 OPERATING PRINCIPLES Figure 2–8: BS142 INVERSE TIME CURVE (1 A MODELS ONLY) GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...

  • Page 24: Instantaneous Unit

    0.0 and 1.55 seconds, in steps of 50 ms steps. The instantaneous unit can be disabled by setting the trip value multiplier to zero. 2.7 CHANGING SETTINGS DO NOT CHANGE SETTINGS WHILE THE MDP IS IN OPERATION AND ITS PROTECTIVE ELE- MENTS IN USE. TAKE THE RELAY OUT OF SERVICE BEFORE MAKING ANY SETTING CHANGES.

  • Page 25: Settings

    0.5 (time dial) = 3 seconds for 1 A relays. For 5 A relays, the time dial (5) is divided by 10, also resulting in a 3 second delay. GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...

  • Page 26: Ioc Delay

    NOTE g) OUTPUT CONTACT CONFIGURATION The MDP relay has two output contacts that can be configured, by means of the output selection switch, allow- ing the user to distinguish either between phase and ground, or between time delay and instantaneous.

  • Page 27: Display And Reset

    The two-digit display can show a maximum operating time of 99 seconds. When the time exceeds 99 seconds, the MDP begins again from zero (0) with both decimal points lit to indicate the initial 100 units. If the time exceeds 199 seconds, the display shows 99 with both decimal points lit.

  • Page 28: Self-Test And Error Routines

    "80" on the display, flashing once per second. The first thing the MDP relay does when powered is to perform a complete check of the EPROM. If any error is detected, a Fatal Error output is given.

  • Page 29: Description

    The boards are mounted horizontally in guides. An internal connection diagram for the MDP is shown on the following page. GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...
  • Page 30 3 CONSTRUCTION GEK-100682D Figure 3–2: INTERNAL CONNECTIONS DIAGRAM MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...

  • Page 31: Displays

    GEK-100682D 3 CONSTRUCTION 3.2 DISPLAYS The MDP relay has eight light-emitting diodes (LEDs) at the top of the front of the relay in order to indicate the following situations: • Ready. A green LED indicates that the relay is in operation.
  • Page 32 3 CONSTRUCTION GEK-100682D MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...

  • Page 33: Installation

    The relay should be mounted on a vertical surface. An outline and panel drilling diagram is shown below. External connection schemes on the following pages. Figure 4–1: OUTLINE AND PANEL DRILLING GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...
  • Page 34 4 INSTALLATION AND MAINTENANCE GEK-100682D Figure 4–2: TYPICAL EXTERNAL CONNECTIONS, GROUND CURRENTS MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...
  • Page 35 GEK-100682D 4 INSTALLATION AND MAINTENANCE Figure 4–3: TYPICAL EXTERNAL CONNECTIONS, RESIDUAL CURRENTS GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...
  • Page 36 4 INSTALLATION AND MAINTENANCE GEK-100682D Figure 4–4: TYPICAL EXTERNAL CONNECTIONS, ZONE SELECTIVE INTERLOCK MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...

  • Page 37: Periodic Checks And Routine Maintenance

    It is recognized that the interval between periodic checks will vary depending upon environment, type of relay, and the user's experience with periodic testing. See Chapter 5: PERIODIC & ACCEPTANCE TESTS for periodic testing using your settings. GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...
  • Page 38 4 INSTALLATION AND MAINTENANCE GEK-100682D MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...

  • Page 39: Description

    2. Connect the relay as indicated in the figure below. In order to apply current to the relay, use a supply of 120 or 220 volts, 50/60 Hz, with a variable resistor in series, or an electronic test source. Figure 5–1: TEST CONNECTIONS GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...
  • Page 40 5.55 to 5.65 3 (0.3) 0.57 to 0.63 1.14 to 1.26 1.71 to 1.89 2.35 to 2.45 1 (0.1) approx. 0.20 approx. 0.40 0.57 to 0.67 0.76 to 0.86 MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...

  • Page 41: Instantaneous Unit

    Repeat each test with the relay connected as in Figure 5–1: TEST CONNECTIONS on page 5–1, except apply current to the ground unit (terminals 7 and 8). For each test, apply ground settings to the relay as instructed. GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...
  • Page 42 5 PERIODIC & ACCEPTANCE TESTS GEK-100682D MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...

  • Page 43: Mdp-Link Software

    This section contains information for the use of MDP-LINK software. A personal computer (PC), along with MDP-LINK, provide local user interface to the relay for operating person- nel. This interface is available in two different serial communications protocols (RS232 and RS485). To deter- mine if your MDP contains this interface check the MDP model number as shown: •...
  • Page 44 6 MDP-LINK SOFTWARE GEK-100682D Figure 6–2: RS485 CABLE CONNECTION MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...

  • Page 45: General Operation

    In addition, the keyboard can be used to select these buttons by using their hot keys. The hot key for the OK button is ALT-O and the hot key for the CANCEL button is ALT-C. GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...

  • Page 46: List Boxes

    If a minor change is desired and the user does not wish to clear the field/box, move the cur- sor first and then do the editing to the entry. MDP Digital Time Overcurrent Relay GE Power Management...

  • Page 47: Main Menu

    Login is used to gain access to the relay. The Login dialog box contains a list of the currently configured relays, a place to enter the unit ID, a button for adding a new MDP relay to the list of configured relays, an OK button and a CANCEL button.
  • Page 48 This item will clear the data associated with the last fault which is stored in the relay. To select this menu item, either click on it with the left mouse button or use the ALT-R hot key. MDP Digital Time Overcurrent Relay GE Power Management...
  • Page 49 CANCEL button or use the ALT-C hot key to return to the Relay func- tions menu. If the breaker is to be closed, click on the OK button or use the ALT-O hot key to close the breaker. GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...

  • Page 50: Local Functions

    IRQ number will be displayed. The serial port that is connected to the MDP system, or the modem used to talk to the MDP system, must be entered before logging in to the relay. If the port chosen is not COM1(1) or COM2(2), the IRQ number for the port chosen must be entered.
  • Page 51 The normal text editing keys may be used to enter or modify the phone number. This is an optional item, and should only be filled in if MDP-LINK is using a modem for the unit being described.

  • Page 52: Help

    MDP-LINK. Selecting the CANCEL button will return to the program without exiting. NOTE: To exit MDP-LINK, all dialog boxes and list boxes must be cleared from the screen. It is not necessary to clear all the menus from the screen.

  • Page 53: Modbus Protocol

    TTL level serial asynchronous protocol. The Modbus interface card does not provide any LED display or key switches as provided for other devices. The MDP relay provides the user interface. The Modbus device address for the MDP unit is configurable from the switches provided on the MDP relay itself;...

  • Page 54: Read Input Registers, Function Code 04

    Data is scanned in the MDP at a rate of 125 registers per scan. In response to this command from Host the module will send back the latest actual value data stored in the MDP, these values will be periodically read by the module from the MDP relay.

  • Page 55: Modbus Memory Map

    0 to 10 A (5 A relay) Float 80/74/05-06h 0 to 2 A (1 A relay) 1009 Ground current 0 to 3 A (5 A relay) Float 80/74/07-08h 0 to 0.7 A (1 A relay) GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...
  • Page 56 2012 Hour 0 to 23 hrs. Unsigned Integer 2013 Minute 0 to 59 min. Unsigned Integer 2014 Seconds 0 to 59 sec. Unsigned Integer 2015 Milliseconds msecs Unsigned Integer MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...
  • Page 57 3015 Ground TOC pickup 0 to 4.375 A (5 A) Float 80/73/03h 0 to 0.0875 A (1 A) 3017 Ground IOC pickup 0 to 31 x TOC Float 80/73/03h GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...

  • Page 58: Coil Commands

    Force ON (FFOO) to close the breaker 7.6 EVENT HANDLING All asynchronous events are logged by the MDP. The most recent N (to be specified) events per device are available. The Concentrator stores the latest 24 events, this number was decided upon based on memory and timing constraints.
  • Page 59 Relay is not responding to WRITE Relay reports an error Fatal error in relay Phase timed overcurrent trip Phase instantaneous overcurrent trip Ground timed overcurrent trip Ground instantaneous overcurrent trip GE Power Management MDP Digital Time Overcurrent Relay Courtesy of NationalSwitchgear.com...
  • Page 60 7 MODBUS PROTOCOL GEK-100682D MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...

  • Page 61: Mdp Faq

    If the minimum pickup value is 1.5 A, then switch the second and third switches to the right to add their values; i.e., 1.5 + 0.75 + 1.5 = 3.75 A. Other MDP settings operate in the same manner.
  • Page 62 If the pickup light is on, it will not reset until current levels are below the pickup point. How do I set Definite Time? Examine the front lower right-hand corner of the MDP faceplate, under CURVE SELECTION. There are four time selections shown for 2, 4, 6, and 8 seconds. The diagram correlates to the positions of the three DIP switches under CURVE.

  • Page 63: Change Notes

    24 to 250 V DC Frequency Range: 40 to 70 Hz Added the following warning: DO NOT CHANGE SETTINGS WHILE THE MDP IS IN OPERATION AND ITS PROTEC- TIVE ELEMENTS IN USE. TAKE THE RELAY OUT OF SERVICE BEFORE MAKING ANY SETTING CHANGES. WARNING...

  • Page 64: Changes To Mdp Manual

    B CHANGE NOTES GEK-100682D B.3 CHANGES TO MDP MANUAL Table B–1: MAJOR UPDATES FOR MDP MANUAL GEK-100682D Page Change From (100682C) (in GEK-100682D) Title Updated “GEK-100682C” “GEK-100682D” Corrected In the Nomenclature Table: “24 to 48 V DC “24-48 VDC (19 to 60 VDC)
  • Page 65 CURRENT RANGES ............ 1-1 pickup ..............2-11 CURVE SELECTION ..........2-11 LAST TRIP CURRENT .......... A-1, A-2 DEFINITE TIME ............A-2 LOGIN WITH MDP-LINK ..........6-5 DIGITAL INPUT BOARD ..........2-2 LOGOUT WITH MDP-LINK ........... 6-5 DISPLAY ..............2-13 DISPLAYS ..............3-3...
  • Page 66 PRODUCT DESCRIPTION ........... 1-1 WEBSITE see back of manual WIRING DIAGRAM ............1-3 RANGES ..............1-7 READ HOLDING REGISTERS ........7-1 READ INPUT REGISTERS ........... 7-2 ZONE SELECTIVE INTERLOCK CONNECTIONS ..4-4 MDP Digital Time Overcurrent Relay GE Power Management Courtesy of NationalSwitchgear.com...
  • Page 67 Warranty shall not apply to any relay which has been subject to mis- use, negligence, accident, incorrect installation or use not in accor- dance with instructions nor any unit that has been altered outside a GE Power Management authorized factory outlet.
  • Page 68 GE POWER MANAGEMENT WEBSITE The latest product information for the MDP Digital Time Overcurrent Relay is available on the Internet via the GE Power Management home page: http://www.GEindustrial.com/pm This site provides access to the following customer services: • Digital Products Directory •...

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