Page 1 Title Page GE Industrial Systems TRANSFORMER MANAGEMENT RELAY™ INSTRUCTION MANUAL Firmware Revision: 280.000 Manual P/N: 1601-0070-B6 (GEK-106292D) Copyright © 2008 GE Multilin 745 TRANSFORMER MANAGEMENT RELAY 745 STATUS SYSTEM STATUS CONDITIONS TRANSFORMER IN SERVICE TRIP DE-ENERGIZED TRANSFORMER SELF-TEST ALARM OVERLOAD...
Page 2 Courtesy of NationalSwitchgear.com...
Page 3: Table Of Contents
LED INDICATORS ..................... 4-2 4.1.5 PROGRAM PORT....................4-3 4.1.6 KEYPAD......................4-3 4.2 745PC SOFTWARE INTERFACE 4.2.1 OVERVIEW......................4-5 4.2.2 REQUIREMENTS ....................4-5 4.2.3 TOOLBAR AND MENUS ................... 4-5 4.2.4 HARDWARE CONFIGURATION ............... 4-6 GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 4 5.6.10 FREQUENCY ....................5-68 5.6.11 OVEREXCITATION ..................5-73 5.6.12 HARMONICS ....................5-77 5.6.13 INSULATION AGING / LOSS OF LIFE ............5-80 5.6.14 ANALOG LEVEL....................5-84 5.6.15 CURRENT DEMAND..................5-85 5.6.16 TRANSFORMER OVERLOAD .................5-86 5.6.17 TAP CHANGER FAILURE................5-87 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 5 PROTOCOLS..................... 7-1 7.1.2 PHYSICAL LAYER..................... 7-1 7.2 MODBUS PROTOCOL 7.2.1 DESCRIPTION....................7-2 7.2.2 GE MULTILIN MODBUS IMPLEMENTATION ........... 7-2 7.2.3 ELECTRICAL INTERFACE................7-2 7.2.4 DATA FRAME FORMAT AND DATA RATE ............7-2 7.2.5 DATA PACKET FORMAT .................. 7-3 GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 6 FREQUENCY ....................8-29 8.5.14 OVEREXCITATION ..................8-34 8.5.15 INSULATION AGING..................8-35 8.5.16 TAP MONITOR FAILURE.................8-35 8.6 AUXILIARY PROTECTION AND MONITORING FUNCTIONS 8.6.1 THD LEVEL SCHEME ..................8-36 8.6.2 HARMONIC DERATING FUNCTION ...............8-37 8.6.3 TRANSFORMER OVERLOAD .................8-37 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 7 TABLE OF CONTENTS 8.7 PLACING THE RELAY INTO SERVICE 8.7.1 PROCEDURE ....................8-38 A. APPENDIX A.1 EU DECLARATION A.1.1 DECLARATION OF CONFORMITY ..............A-1 A.2 WARRANTY A.2.1 GE MULTILIN WARRANTY ................A-2 GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 8 TABLE OF CONTENTS viii 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 9: Product Overview
Analog Input Level 1 1THD Total Harmonic Distortion Level AN-2 Analog Input Level 2 Current Demand Insulation Aging: • Aging Factor • Hottest Spot Limit • Total Accumulated Life Tap Changer Monitor GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 10 Ground Differential (Restricted Ground Fault) 251G Ground Time Overcurrent 3THD Total Harmonic Distortion Level 287TG Ground Differential (Restricted Ground Fault) Current Demand 2THD Total Harmonic Distortion Level Current Demand Figure 1–1: SINGLE LINE DIAGRAM 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 11: Order Codes
40 to 60 V DC; 20 to 48 V AC at 48 to 62 Hz POWER 90 to 300 V DC; 70 to 265 V AC at 48 to 62 Hz OPTIONS Analog Inputs/Outputs Loss of Life Restricted Ground Fault GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 12: Specifications
1.0 to 10 V pk-pk Overload Withstand: 1 second at 80 times rated current DC Shift: 2 seconds at 40 times rated current Input Impedance 70 to 100 kΩ continuous at 3 times rated current 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 13: Protection Elements
Winding 1 Phase A current / voltage Level Accuracy: ±0.02 Hz Operate Time: The operate time of the frequency trend element is variable and is dependent on the decay rate setting and the supervi- sion frequency level. GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 14 Solid State Output Operate Time: at 1.10 × pickup: 165 to 195 ms Relay Outputs 2 to 5 Operate Time: at 1.10 × pickup: 170 to 200 ms (delay set at 0.0 s) 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 15: Outputs
Operational test at ambient then increas- ing to 60°C Dielectric Strength: Per IEC 255-5 and ANSI/IEEE C37.90 On CT inputs, VT inputs, Control Power inputs, Switch inputs, and Relay outputs (2 kV for 1 second) GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 16 It is recommended that all 745 relays be powered up at least once per year to avoid deterioration of electro- lytic capacitors in the power supply. NOTE Specifications subject to change without notice. 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 17: Getting Started
), either starts with an upper- 4.0 s case character followed by lowercase characters or is a number followed by units. This second part is the present value of the data. FLASH MESSAGE TIME: 4.0 s GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 18: Changing Setpoints
HELP MINIMUM: 60.0 MAXIMUM: 120.0 IN STEPS OF: PRESS (0)-(9) OR VALUE PRESS [ENTER] TO STORE NEW VALUE END OF PAGE S1 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 19 Editing changes are not registered until is pressed, storing the new value in memory. This flash message momen- ENTER tarily appears to confirm the storing process. NEW SETPOINT HAS BEEN STORED GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 20 Once complete, press to remove ESCAPE the solid cursor and view the result. OUTPUT 3 NAME: INST DIFF TRIP 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 21: Security
As a safety measure, the relay ENTER requires you to enter a new passcode twice. This ensures the passcode has been entered correctly. PLEASE RE-ENTER NEW PASSCODE: GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 22: Disabling And Enabling Passcode Security
It indicates that passcode security is now enabled. ENTER SETPOINT ACCESS IS NOW RESTRICTED After a few seconds, the original display returns. 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 23: Installation
When planning the location of your panel cutout, ensure provision is made for the front door to swing open without interference to or from adjacent equipment. Double Panel Single Panel Figure 3–2: SINGLE AND DOUBLE SR RELAY PANEL CUTOUT GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 24: Case Mounting
With the latch raised, pull the center of the handle outward. Once disengaged, continue rotating the handle up to the stop position. PRESS LATCH UP AND PULL ROTATE HANDLE TO STOP HANDLE POSITION 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 25 As such, a separate seal can be installed on the outside of the door to prevent it from being opened. Figure 3–5: DRAWOUT SEAL GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 26: Typical Wiring
The information in this section covers the important aspects of interconnec- tions, in the general areas of instrument transformer inputs, other inputs, outputs, communications, and grounding. 3.2.2 REAR TERMINAL LAYOUT Figure 3–6: REAR TERMINAL LAYOUT 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 27 PHASE C - WINDING 3 CT SETPOINT ACCESS (–) GROUND - WINDING 1/2 CT LOGIC POWER OUT (+) CONTROL POWER (–) LOGIC POWER OUT (–) CONTROL POWER (+) indicates high side of CT and VT terminals GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 28: Wiring Diagrams
VT is connected to, the power may be negative when the generator is producing positive MWatts. This can be corrected by reversing the voltage input into C11 and C12. 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 29 3 INSTALLATION 3.2 TYPICAL WIRING Figure 3–8: TYPICAL WIRING FOR THREE WINDING TRANSFORMER GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 30: Phase Sequence And Transformer Polarity
IMPORTANT: The relay will correctly measure up to 46 times the current input nominal rating. Time over- current curves become horizontal lines for currents above the 46 × CT rating. NOTE 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 31: Ac Voltage Input
+32 V DC Logic Input 1 Logic Input 1 32 V DC 32 V DC 30 to 300 V DC DC Negative DC Negative LOGICIN.CDR Figure 3–10: DRY AND WET CONTACT CONNECTIONS GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 32: Control Power
The maximum total resistance the Tap Changer input can measure is 5.1 KΩ. For example, the maximum resistance incre- ment per tap for a 33-position Tap Changer should not exceed 151 Ω. 3-10 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 33: Rtd Driver/Sensor
1 KΩ; for a 0 to 10 mA channel, this resistor would be 500 Ω; and for a 4 to 20 mA channel this resistor would be 250 Ω. Figure 3–12: ANALOG OUTPUT CONNECTION GE Multilin 745 Transformer Management Relay 3-11...
Page 34: Rs485 / Rs422 Communications
To ensure maximum reliability, all equipment should have similar transient protection devices installed. Figure 3–13: RS485 WIRING 3-12 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 35: Rs232 Front Panel Program Port
The 745PC software required to use this interface is included with the relay. Cabling for the RS232 port is shown below for both 9 pin and 25 pin connectors. Figure 3–15: RS232 WIRING GE Multilin 745 Transformer Management Relay 3-13...
Page 36: Irig-B
No special ventilation requirements need to be observed during the installation of the unit. The unit does not have to be cleaned. NOTE Hazard may result if the product is not used for its intended purpose. WARNING 3-14 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 37: Human Interfaces
Trip and alarm condition messages automatically override default mes- sages. All display pixels are illuminated briefly during power up self-testing, and can be energized by pressing when NEXT no trips or alarms are active. GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 38: Leds
The Message LED indicator is on when any element has picked up, operated, or is now in a latched state waiting to be reset. With this indicator on, the front panel display is sequentially displaying information about each element that has detected an abnormal condition. 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 39: Program Port
If the display has timed out to the default messages, pressing SETPOINT returns the display to the last viewed setpoint message. The keys move between messages within a MESSAGE MESSAGE page. GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 40 Note that diagnostic messages for self-resetting targets disappear with the condition, but diagnostic messages for latched targets remain until they are cleared. When no targets are active, illuminates all front panel indicators for approxi- NEXT mately 5 seconds. 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 41: 745Pc Software Interface
Modem Dial Sets the communications parameters Sends the current file to the printer Saves the current file to disk Open an existing file Open a new file Figure 4–2: 745PC TOOLBAR SUMMARY GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 42: Hardware Configuration
GE Multilin F485 RS232-to-RS485 converter. • A standard “straight through” serial cable connected from your computer to the GE Multilin F485 Converter box. The converter box end should be DB-9 male and the computer end DB-9 or DB-25 female for COM1 or COM2 respectively.
Page 43 4.2 745PC SOFTWARE INTERFACE COMPUTER RS232 CONNECTOR COMPUTER COM PORT TYPICALLY COM1 OR COM2 814798A4.CDR Figure 4–4: RS232 COMMUNICATIONS SETUP COMPUTER GE Power Management RS232 to RS485 POWER SUPPLY Converter MODULE TO WALL PLUG 745 rear RS232 CONNECTOR terminal block AB...
Page 44: 745Pc Installation
Ensure that Windows is running on the local PC. Insert the GE Multilin Products CD into your CD-ROM drive or point your web browser to the GE Multilin website at http://www.GEindustrial.com/multilin. Under Windows 95/98, the Product CD will launch the welcome screen automat- ically.
Page 45: Startup And Communications Configuration
Startup of the 745PC software is accomplished as follows: Double-click on the 745 software icon inside the GE Multilin group or select from the Windows Start menu to launch 745PC. The 745 to PC communications status is displayed on the bottom right corner of the screen: To configure communications, select the Communication >...
Page 46: Using 745Pc
All 745 setpoint files should have the extension .745 (for example, xfrmr01.745). Click OK to proceed. Figure 4–9: SAVING SETPOINTS The software reads all the relay setpoint values and stores them to the selected file. 4-10 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 47 File names for released 745 firmware have the following format: 33 D 260 A4 .000 Modification Number (000 = none) GE Power Management use only Firmware Revision Required 745 hardware revision Product code (33 = 745 Transformer Mgt. Relay) Figure 4–10: FIRMWARE FILE FORMAT...
Page 48 Click the Transformer button in the System Setup window. The following dialog box prompts for the transformer setpoint information. Note that the number of selections shown is dependent on the 745 installed options. Figure 4–12: TRANSFORMER SETPOINTS WINDOW 4-12 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 49 Select a Transformer Type from the drop-down menu. Checked boxes indicate that the user has visited the setpoint during this session. Checked boxes indicate that the user has visited the setpoint during this session. GE Multilin 745 Transformer Management Relay 4-13 Courtesy of NationalSwitchgear.com...
Page 50 For example, to view the positive, negative and zero sequence currents in any of the windings click on the Sequence tab. Figure 4–14: ACTUAL VALUES WINDOW 4-14 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 51: Setpoints
[ENTER] for more MESSAGE HARMONICS ESCAPE See page 5–32. [ENTER] for more MESSAGE FLEXCURVES ESCAPE See page 5–33. [ENTER] for more MESSAGE VOLTAGE INPUT ESCAPE See page 5–33. [ENTER] for more MESSAGE GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 52 [ENTER] for more MESSAGE HARMONICS ESCAPE See page 5–77. [ENTER] for more MESSAGE INSULATION AGING ESCAPE See page 5–80. [ENTER] for more MESSAGE ANALOG INPUT ESCAPE See page 5–84. [ENTER] for more MESSAGE 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 53 [ENTER] for more ESCAPE ANALOG OUTPUTS ESCAPE See page 5–94. [ENTER] for more MESSAGE SIMULATION ESCAPE See page 5–95. [ENTER] for more MESSAGE FACTORY SERVICE ESCAPE See page 5–98. [ENTER] for more MESSAGE GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 54: Setpoint Entry
Passcode protection may also be enabled. When enabled, the 745 requests a numeric passcode before any setpoint can be entered. As an additional safety measure, a minor self-test error is generated when the passcode is entered incorrectly three times in a row. 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 55: Auto-Configuration
WINDING 2 RATED LOAD : "1500:1 A" S2 SYSTEM SETUP WINDING 2 WINDING 2 PHASE CT PRIMARY For a 3-winding transformer, the setpoints under must also be set. S2 SYSTEM SETUP/WINDING 3 GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 56 : "61.0 kV" MINIMUM TAP POSITION VOLTAGE : "0.50 kV" VOLTAGE INCREMENT PER TAP : "33 Ω" RESISTANCE INCREMENT PER TAP The maximum value resistance on the top tap is 5 kΩ. 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 57: Phase Shifts On Three-Phase Transformers
The source phase sequence must be stated when describing the winding phase relationships since these relationships change when the phase sequence changes. The example below shows why this happens, using a transformer described in IEC nomenclature as "Yd1" or in GE Multilin nomenclature as "Y/d30." Figure 5–2: EXAMPLE TRANSFORMER The above figure shows the physical connections within the transformer that produce a phase angle in the delta winding that lags the respective wye winding by 30°.
Page 58: Phase Angle Correction
Note that the Delta winding currents leads the Wye winding currents by 30°, (which is a type Yd11 in IEC nomenclature and a type Y/d330 in GE Multilin nomenclature) which is in disagreement with the transformer nameplate. This is because the physical connections and hence the equations used to calculate current for the delta winding have not changed.
Page 59: Zero-Sequence Component Removal
Delta circuit. In both these cases, there is zero-sequence impedance between the primary and secondary windings. The 745 removes zero-sequence current from all Wye/Wye and Wye/Wye/Wye transformer windings to prevent possible relay maloperations resulting from these two conditions. GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 60: Transformer Types
DELTA 300° Y/d210° 210° (gnd 1/2) DELTA 0° 300° lag DELTA 0° 210° lag D/y30° DELTA 0° Y/d330° 330° (gnd 1/2) 330° (gnd 1/2) 30° lag DELTA 0° 330° lag 5-10 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 61 300° lag ZIG-ZAG 0° (gnd 2/3) 3W External 0° 210° lag Correction (gnd 1/2) Y/z330° 330° (gnd 1/2) 0° (gnd 2/3) 0° ZIG-ZAG 0° (gnd 2/3) 0° 330° lag 0° GE Multilin 745 Transformer Management Relay 5-11 Courtesy of NationalSwitchgear.com...
Page 62 0° 210° lag 210° lag Y/y0°/d330° 330° Y/y180°/d330° 330° (gnd 1/2) (gnd 1/2) 330° 150° (gnd 2/3) (gnd 2/3) 0° 180° lag DELTA 0° DELTA 0° 330° lag 330° lag 5-12 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 63 0° Y/d30°/d150° 30° lag Y/d150°/y180° 150° lag (gnd 1/2) (gnd 1/2) DELTA 0° DELTA 0° 30° lag 150° lag DELTA 240° lag 330° lag 150° lag (gnd 2/3) 180° lag GE Multilin 745 Transformer Management Relay 5-13 Courtesy of NationalSwitchgear.com...
Page 64 210° lag Y/d210°/d150° 210° lag Y/d150°/d330° 150° lag (gnd 1/2) (gnd 1/2) DELTA 0° DELTA 0° 210° lag 150° lag DELTA 60° lag DELTA 180° lag 150° lag 330° lag 5-14 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 65 210° lag 0° Y/d330°/y180° 330° lag Y/d330°/d330° 330° lag (gnd 1/2) (gnd 1/2) DELTA 0° DELTA 0° 330° lag 330° lag 150° lag DELTA 0° (gnd 2/3) 330° lag 180° lag GE Multilin 745 Transformer Management Relay 5-15 Courtesy of NationalSwitchgear.com...
Page 66 150° lag (gnd 2/3) 210° lag D/d0°/d240° DELTA 240° lag D/d0°/y330° DELTA 0° DELTA 240° lag 0° DELTA 0° 0° DELTA 0° 240° lag 30° lag (gnd 2/3) 330° lag 5-16 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 67 150° lag D/d60°/y210° DELTA 0° D/d120°/y330° DELTA 0° DELTA 300° lag DELTA 240° lag 60° lag 120° lag 150° lag (gnd 2/3) 30° lag 210° lag (gnd 2/3) 330° lag GE Multilin 745 Transformer Management Relay 5-17 Courtesy of NationalSwitchgear.com...
Page 68 300° lag D/d240°/y30° DELTA 0° D/d180°/y150° DELTA 0° DELTA 120° lag 240° lag DELTA 180° lag 180° lag 330° lag (gnd 2/3) 30° lag 210° lag (gnd 2/3) 150° lag 5-18 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 69 210° lag (gnd 1/2) 150° lag DELTA 300° lag 60° lag DELTA 240° lag 120° lag D/y30°/d240° DELTA 0° 330° lag (gnd 1/2) 30° lag DELTA 120° lag 240° lag GE Multilin 745 Transformer Management Relay 5-19 Courtesy of NationalSwitchgear.com...
Page 70 210° lag 150° lag 330° lag 30° lag (gnd 2/3) (gnd 2/3) 30° lag 330° lag D/y210°/y210° DELTA 0° 150° lag (gnd 1/2) 210° lag 150° lag (gnd 2/3) 210° lag 5-20 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 71 0° D/y330°/d300° DELTA 0° 30° lag (gnd 1/2) 330° lag DELTA 60° lag 300° lag D/y330°/y150° DELTA 0° 30° lag (gnd 1/2) 330° lag 210° lag (gnd 2/3) 150° lag GE Multilin 745 Transformer Management Relay 5-21 Courtesy of NationalSwitchgear.com...
Page 72: Phase Shifts
= (A – B) / 150° lag 330° lag b = (C – B) / b = (B – C) / c = (A – C) / c = (C – A) / 5-22 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 73: S1 745 Setup
DEFAULT MESSAGE TIMEOUT: After this period of time of no activity on the keys, the 745 automatically begins to display the programmed set of default messages programmed in S1 745 SETUP DEFAULT MESSAGES GE Multilin 745 Transformer Management Relay 5-23 Courtesy of NationalSwitchgear.com...
Page 74: Communications
RS422. • FRONT BAUD RATE / FRONT PARITY: Select the baud rate / parity for the front panel port. These setpoints cannot be changed via the communication ports. 5-24 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 75: Dnp Communications
Enabling this setpoint will cause the cold restart request to initialize only the DNP sub-module. When “Disabled” is selected, a cold restart request will cause loss of protection until the 745 reset completes. WARNING GE Multilin 745 Transformer Management Relay 5-25 Courtesy of NationalSwitchgear.com...
Page 76: Resetting
3:05 PM. ENTER • IRIG-B SIGNAL TYPE: Select the type of IRIG-B signal being used for clock synchronization. Select "None" if no IRIG- B signal is to be used. 5-26 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 77: Default Messages
Text 1 one character at a time, using . Press the key to store the edit and advance to the VALUE VALUE ENTER next character position. This message may then be stored as a default message. GE Multilin 745 Transformer Management Relay 5-27 Courtesy of NationalSwitchgear.com...
Page 78: Installation
745 to upgrade its options. A flash message appears indicating the results of the upgrade. A successful upgrade may be verified by examining the installed options display under A4 PRODUCT INFO REVISION CODES INSTALLED OPTIONS 5-28 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 79: S2 System Setup
• PHASE SEQUENCE: Enter the phase sequence of the power system. Systems with an ACB phase sequence require special considerations. See Section 5.2.3: Phase Shifts on Three-Phase Transformers on page 5–7 for details. GE Multilin 745 Transformer Management Relay 5-29...
Page 80: Winding
• WINDING TIME CONST: Required for Insulation Aging calculations • SET ACCUMULATED LOSS OF LIFE: Required for Insulation Aging calculations. Set equal to the estimated accumu- lated loss of life. 5-30 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 81 This value is normally only available from the transformer manufacturer’s test report, and is used in the 745 for calculation of harmonic derating factor. GE Multilin 745 Transformer Management Relay 5-31 Courtesy of NationalSwitchgear.com...
Page 82: Onload Tap Changer
The harmonic derating factor will only be valid if this information has been entered correctly. 5-32 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 83: Flexcurves
VOLTAGE INPUT PARAMETER: Enter the winding and phase of the voltage connected to the voltage input. • NOMINAL VT SECONDARY VOLTAGE: Enter the nominal secondary voltage (in volts) of the voltage transformer. • VT RATIO: Enter the ratio of the voltage transformer. GE Multilin 745 Transformer Management Relay 5-33 Courtesy of NationalSwitchgear.com...
Page 84: Ambient Temperature
AVERAGE AMBIENT TEMPERATURE (BY MONTH): This message is displayed only when the AMBIENT RTD TYPE set for "By Monthly Average". Ambient temperature is used in the calculation of Insulation Aging and must be enabled for the function to operate. 5-34 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 85: Analog Input
ANALOG INPUT RANGE: Select the current output range of the transducer that is connected to the analog input. • ANALOG INPUT MINIMUM/MAXIMUM: Enter the value of the quantity measured which corresponds to the minimum/ maximum output value of the transducer. GE Multilin 745 Transformer Management Relay 5-35 Courtesy of NationalSwitchgear.com...
Page 86: Demand Metering
TIME INTERVAL: This message is displayed only when the is set for “Block Interval” or CURRENT DEMAND METER TYPE “Rolling Demand”. Enter the time period over which the current demand calculation is performed. 5-36 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 87: Analog Outputs
ANALOG OUPUT 1(7) RANGE: Select the full-scale range of output current for Analog Output 1(7). • ANALOG OUTPUT 1(7) MIN/MAX: Enter the value of the selected parameter which corresponds to the minimum/ maximum output current of Analog Output 1(7). GE Multilin 745 Transformer Management Relay 5-37 Courtesy of NationalSwitchgear.com...
Page 88: S3 Logic Inputs
VALUE VALUE ENTER • INPUT 1 PROGRAMMED STATE: Select "Asserted" to place the virtual input into the signaling state; likewise, select "Not Asserted" to place it into the non-signaling state. 5-38 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 89: S4 Elements
Shown as the following schematic symbol: ⊗. • • The exact wording of the front panel label identifies the indicator. LOGIC • Described using basic AND gates and OR gates GE Multilin 745 Transformer Management Relay 5-39 Courtesy of NationalSwitchgear.com...
Page 90: Setpoint Group
, which imple- 5TH HARMONIC INHIBIT ments an inhibit scheme based on 5th harmonic only, allowing inhibiting the percent differential during intentional overexci- tation of the system. 5-40 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 91 NOTE The basic percent differential operating principle for three-winding transformers is illustrated by the following equations: max I restraint differential (EQ 5.4) × --- - %slope 100% GE Multilin 745 Transformer Management Relay 5-41 Courtesy of NationalSwitchgear.com...
Page 92 2. The source is connected to one winding only. Therefore, the value cannot be greater than 100%. To increase dependability, PERCENT DIFFERENTIAL SLOPE 2 the Slope 2 settings should be less than 98% 5-42 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 93 For most transformers, INHIBIT LEVEL the 2 harmonic current alone will exceed 20% during energization and the "2nd" value is sufficient to inhibit the differ- ential element for inrush current. GE Multilin 745 Transformer Management Relay 5-43 Courtesy of NationalSwitchgear.com...
Page 94 MESSAGE Range: Logic Input 1 to 16, Disabled BREAKERS ARE OPEN ESCAPE SIGNAL: Disabled MESSAGE Range: Logic Input 1 to 16, Disabled PARALL XFMR BRKR CLS ESCAPE SIGNAL: Disabled MESSAGE 5-44 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 95 PARALL XFMR BRKR CLS SIGNAL: Select any logic input which, when asserted, will indicate to the 745 the onset of sympathetic inrush. The selected logic input should be connected to the close command going to the parallel trans- former switching device. GE Multilin 745 Transformer Management Relay 5-45...
Page 96 5.6 S4 ELEMENTS 5 SETPOINTS Figure 5–10: ENERGIZATION INHIBIT SCHEME LOGIC Figure 5–11: ENERGIZATION SENSING SCHEME LOGIC 5-46 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 97 • 5th HARMONIC INHIBIT LEVEL: Enter the level of 5th harmonic current above which the percent differential element will be inhibited from operating. Figure 5–12: 5TH HARMONIC INHIBIT SCHEME LOGIC GE Multilin 745 Transformer Management Relay 5-47 Courtesy of NationalSwitchgear.com...
Page 98: Instantaneous Differential
INST DIFFERENTIAL PICKUP: Enter the level of differential current (in units of relay nominal current) above which the instantaneous differential element will pickup and operate. Figure 5–13: INSTANTANEOUS DIFFERENTIAL SCHEME LOGIC 5-48 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 99: Phase Overcurrent
TIME OVERCURRENT CURVES The inverse time overcurrent curves used by the TOC (time overcurrent) elements are the ANSI, IEC, and GE Type IAC curve shapes. This allows for simplified coordination with downstream devices. If however, none of these curve shapes is adequate, FlexCurves™...
Page 100 4.544 2.866 2.291 1.994 1.812 1.689 1.600 1.532 1.479 10.807 6.059 3.821 3.054 2.659 2.416 2.252 2.133 2.043 1.972 10.0 13.509 7.574 4.776 3.818 3.324 3.020 2.815 2.666 2.554 2.465 5-50 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 101 0.668 0.526 0.451 0.404 0.371 0.346 0.327 0.311 0.80 2.446 1.423 0.890 0.702 0.602 0.538 0.494 0.461 0.435 0.415 1.00 3.058 1.778 1.113 0.877 0.752 0.673 0.618 0.576 0.544 0.518 GE Multilin 745 Transformer Management Relay 5-51 Courtesy of NationalSwitchgear.com...
Page 102 T = Operate Time (sec.) M = Multiplier Setting I = Input Current = Pickup Current Setting A to E = Constants pickup Table 5–9: GE TYPE IAC INVERSE TIME CURVE CONSTANTS IAC CURVE SHAPE IAC EXTREME INVERSE 0.0040 0.6379 0.6200 1.7872...
Page 103 (as per ANSI / IEEE C57.110-1986) and, when this feature is enabled, automatically shifts the phase time overcurrent curve pickup in order to maintain the required protection margin with respect to the trans- former thermal damage curve, as illustrated below. GE Multilin 745 Transformer Management Relay 5-53...
Page 104 Transformer thermal protection margin current Pickup setting based rated load capability Pickup shifted based on harmonic derating Figure 5–14: HARMONIC DERATING CORRECTION Figure 5–15: PHASE TOC SCHEME LOGIC 5-54 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 105 The setpoint messages above and the following logic diagram are identical for the PHASE INSTANTA- NEOUS OVERCURRENT 2 element. NOTE Figure 5–16: PHASE IOC 1 SCHEME LOGIC GE Multilin 745 Transformer Management Relay 5-55 Courtesy of NationalSwitchgear.com...
Page 106: Neutral Overcurrent
), which is calculated internally as the vector sum of the three phases. This section contains the settings to configure the neutral overcurrent elements. Included are neutral time overcurrents for each winding, and two levels of neutral instantaneous overcurrent for each winding. 5-56 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 107 Select “Instantaneous” reset to coordinate with relays, such as most static units, with instantaneous reset characteristics. Figure 5–17: NEUTRAL TOC SCHEME LOGIC GE Multilin 745 Transformer Management Relay 5-57 Courtesy of NationalSwitchgear.com...
Page 108 The setpoint messages above and the following logic diagram are identical for the Neutral Instantaneous Overcurrent 2 element. NOTE Figure 5–18: NEUTRAL IOC 1 SCHEME LOGIC 5-58 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 109: Ground Overcurrent
This section contains the settings to configure the ground overcurrent elements. Included are ground time overcurrents for each (wye or zig-zag) winding, and two levels of ground instantaneous overcurrent for each (wye or zig-zag) winding. GE Multilin 745 Transformer Management Relay 5-59...
Page 110 W1(3) GROUND TIME OC RESET: Enter the multiplier constant by which the selected time overcurrent curve shape (the base curve) is to be shifted in time. Figure 5–19: GROUND TOC SCHEME LOGIC 5-60 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 111 The messages above and scheme logic below are identical for Windings 2 and 3 of Ground Instantaneous Overcurrent 1 and all windings on the Ground Instantaneous Overcurrent 2 element. NOTE Figure 5–20: GROUND IOC 1 SCHEME LOGIC GE Multilin 745 Transformer Management Relay 5-61 Courtesy of NationalSwitchgear.com...
Page 112: Restricted Ground (Differential Ground)
Therefore, the resultant differential currents could be below the slope threshold of the per- cent differential element and thus the fault could go undetected. The graph below shows the relationship between the pri- 5-62 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 113 Maximum Phase Slope = Igd/Imax Current Slope > Setpoint Calculate Timer OUTPUT 0 to 0.5 s Calculate Igd > Setpoint |3I – Ig| Measure Figure 5–25: RESTRICTED GROUND FAULT IMPLEMENTATION GE Multilin 745 Transformer Management Relay 5-63 Courtesy of NationalSwitchgear.com...
Page 114 W1(3) RESTD GND FAULT DELAY: Enter the time that the Winding 1(3) Restricted Ground Fault element must remain picked up before the element operates. Figure 5–26: RESTRICTED GROUND FAULT SCHEME LOGIC 5-64 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 115: Negative Sequence Overcurrent
MESSAGE This section contains the settings to configure the negative sequence overcurrent elements. Included are negative sequence time overcurrents for each winding, and negative sequence instantaneous overcurrents for each winding. GE Multilin 745 Transformer Management Relay 5-65 Courtesy of NationalSwitchgear.com...
Page 116 “energy” accumulated to that required to trip. Select Instantaneous reset to coordinate with relays, such as most static units, with instantaneous reset characteristics. Figure 5–27: NEGATIVE SEQUENCE TOC SCHEME LOGIC 5-66 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 117 W1(3) NEG SEQ INST OC DELAY: Enter the time that the negative sequence current must remain above the pickup level before the element operates. Figure 5–28: NEGATIVE SEQUENCE IOC SCHEME LOGIC GE Multilin 745 Transformer Management Relay 5-67 Courtesy of NationalSwitchgear.com...
Page 118: Frequency
Range: Logc Inpt 1 to 16, Virt Inpt 1 to 16, Output Rly 2 to UNDERFREQUENCY 1 ESCAPE 8, SelfTest Rly, Vir Outpt 1 to 5, Disabled BLOCK: Disabled MESSAGE 5-68 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 119 • UNDERFREQUENCY 1(2) DELAY: Enter the time the frequency remains below the pickup level before element oper- ation. Figure 5–29: UNDERFREQUENCY 1 SCHEME LOGIC GE Multilin 745 Transformer Management Relay 5-69 Courtesy of NationalSwitchgear.com...
Page 120 FREQUENCY DECAY THRESHOLD: Enter the frequency (in Hz) below which the four frequency rate-of-change lev- els of the frequency decay element will be allowed to operate. • FREQUENCY DECAY RATE 1(4): Enter the rate of frequency decay beyond which the corresponding element oper- ates. 5-70 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 121 MESSAGE Range: Logc Inpt 1 to 16, Virt Inpt 1 to 16, Output Rly 2 to OVERFREQUENCY ESCAPE 8, SelfTest Rly, Vir Outpt 1 to 5, Disabled BLOCK: Disabled MESSAGE GE Multilin 745 Transformer Management Relay 5-71 Courtesy of NationalSwitchgear.com...
Page 122 OVERFREQUENCY PICKUP: Enter the frequency (in Hz) above which the overfrequency element will pickup and start the delay timer. • OVERFREQUENCY DELAY: Enter the time that the frequency must remain above the pickup level before the element operates. Figure 5–31: OVERFREQUENCY SCHEME LOGIC 5-72 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 123: Overexcitation
A significant amount of current at the 5th harmonic is characteristic of overexcitation. This section contains the settings to configure the overexcitation monitoring elements. Included are a 5th harmonic level, and two volts-per-hertz elements, each with a pickup level and a time delay. GE Multilin 745 Transformer Management Relay 5-73...
Page 124 • 5TH HARMONIC LEVEL DELAY: Enter the time that the 5th harmonic current must remain above the pickup level before the element operates. Figure 5–32: 5TH HARMONIC LEVEL SCHEME LOGIC 5-74 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 125 VOLTS-PER-HERTZ 1 DELAY: Enter the time that the volts-per-hertz value must remain above the pickup level before the element operates. • VOLTS-PER-HERTZ 1 RESET: Enter the time that the volts-per-hertz value must remain below the pickup level before the element resets. GE Multilin 745 Transformer Management Relay 5-75 Courtesy of NationalSwitchgear.com...
Page 126 V = fundamental RMS value of voltage (V) F = frequency of voltage signal (Hz) Pickup = volts-per-hertz pickup setpoint (V/Hz) 1.00 1.20 1.40 1.60 1.80 2.00 Multiples of Voltz/Hertz Pickup 5-76 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 127: Harmonics
See page 5–79. [ENTER] for more MESSAGE This section contains the settings to configure the total harmonic distortion monitoring elements. Included are a THD level element for each winding and each phase. GE Multilin 745 Transformer Management Relay 5-77 Courtesy of NationalSwitchgear.com...
Page 128 Distortion element level will pickup and start the delay timer. • W1(3) THD LEVEL DELAY: Enter the time that the total harmonic distortion must remain above the pickup level before the element operates. Figure 5–34: THD LEVEL SCHEME LOGIC 5-78 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 129 • W1(3) HARMONIC DERATING DELAY: Enter the time that the harmonic derating must remain below the pickup level before the element operates. Figure 5–35: HARMONIC DERATING SCHEME LOGIC GE Multilin 745 Transformer Management Relay 5-79 Courtesy of NationalSwitchgear.com...
Page 130: Insulation Aging / Loss Of Life
The preferred approach for ambient temperature is to use an RTD connected to the 745. If this is not feasible, average val- ues for each month of the year can be entered as settings, under S2 SYSTEM SETUP AMBIENT TEMPERATURE AMBI- and selecting By Monthly Average. ENT RTD TYPE 5-80 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 131 • HOTTEST SPOT LIMIT DELAY: Enter a time delay above which the hottest-spot temperature must remain before the element operates. Figure 5–36: HOTTEST-SPOT LIMIT SCHEME LOGIC GE Multilin 745 Transformer Management Relay 5-81 Courtesy of NationalSwitchgear.com...
Page 132 • AGING FACTOR LIMIT DELAY: Enter a time delay above which the Aging Factor must remain before the element operates. Figure 5–37: AGING FACTOR LIMIT SCHEME LOGIC 5-82 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 133 10 = 131400. × The actual values are only displayed if the Loss of Life option is installed and the ambient temperature is enabled. NOTE Figure 5–38: LOSS-OF-LIFE SCHEME LOGIC GE Multilin 745 Transformer Management Relay 5-83 Courtesy of NationalSwitchgear.com...
Page 134: Analog Level 1
The analog input is configured in S2 SYSTEM SETUP ANALOG INPUT the actual values displayed in A2 METERING ANALOG INPUT Figure 5–39: ANALOG LEVEL SCHEME LOGIC 5-84 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 135: Current Demand
This section contains the settings to configure the current demand monitoring elements. Included are a current demand level for each winding and each phase. Figure 5–40: CURRENT DEMAND SCHEME LOGIC GE Multilin 745 Transformer Management Relay 5-85 Courtesy of NationalSwitchgear.com...
Page 136: Transformer Overload
XFMR OVERTEMP ALARM SIGNAL: Select any logic input that, when asserted, indicates the transformer cooling system has failed and an over-temperature condition exists. The logic input should be connected to the transformer winding temperature alarm contacts. Figure 5–41: TRANSFORMER OVERLOAD SCHEME LOGIC 5-86 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 137: Tap Changer Failure
Setpoint group for the Harmonic Restrained Differential element, assuming that the tap changer position was used to compensate the input current magnitude. Figure 5–42: TAP CHANGER FAILURE SCHEME LOGIC GE Multilin 745 Transformer Management Relay 5-87...
Page 138 The timer runs to completion (i.e. the ‘start’ condition is met for the programmed time delay) * element refers to any protection or monitoring element programmed under page S4 ELEMENTS 5-88 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 139 AND gate. The inputs of the 2-input AND gate are the output of the NOT gate, and Output Relay 2. The input to the NOT gate is Logic Input 2. The inputs to the 2-input XOR gate are Virtual Output 1 and Logic Input 1. For all these gates, the inputs precede the gate itself. GE Multilin 745 Transformer Management Relay 5-89...
Page 140 (Output 1) remains closed until externally reset by a momentary interruption of current, unless wired in parallel with an electromechanical relay (Outputs 2 to 8) in which case it turns off when the relay operates. 5-90 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 141 Xfmr Overload OP OR (2 inputs) OR (2 inputs) Any W2 OC OP 5th HarmLevel OP OR (4 inputs) OR (4 inputs) 06 to 20 Figure 5–45: OUTPUT RELAYS SCHEME LOGIC GE Multilin 745 Transformer Management Relay 5-91 Courtesy of NationalSwitchgear.com...
Page 142 This section contains the settings (including the FlexLogic™ equation) to configure trace memory triggering. • NO. OF PRE-TRIGGER CYCLES: Enter the number of cycles of data, of the 16 cycles of waveform data to be cap- tured, that are to be pre-trigger information. 5-92 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 143 • TIMER 1(10) DROPOUT DELAY: Enter the delay time after which the start condition for Timer 1(10) must remain not operated or not asserted, before the timer will stop operating. GE Multilin 745 Transformer Management Relay 5-93 Courtesy of NationalSwitchgear.com...
Page 144 4 to 20 mA, entering 100% outputs 20 mA, 0% outputs 4 mA, and 50% outputs 12 mA. This setpoint is only operational if analog output testing is enabled. 5-94 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 145 • START PLAYBACK MODE SIGNAL: Select any logic input which, when asserted, initiates Playback Mode simulation. This signal has an effect only if the 745 is initially in Prefault Mode. GE Multilin 745 Transformer Management Relay 5-95 Courtesy of NationalSwitchgear.com...
Page 146 Range: 0 to 359° in steps of 1 W3 PHASE A CURRENT ESCAPE ANGLE: 0° MESSAGE Range: 0 to 359° in steps of 1 W1 PHASE B CURRENT ESCAPE ANGLE: 0° MESSAGE 5-96 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 147 • W1(3) GROUND CURRENT ANGLE: Enter the Winding 1(3) ground current angle (with respect to the Winding 1 Phase A current phasor). This message only appears for wye or zig-zag connected windings. GE Multilin 745 Transformer Management Relay 5-97 Courtesy of NationalSwitchgear.com...
Page 148 This section contains settings intended for factory use only, for calibration, testing, and diagnostics. The messages can only be accessed by entering a factory service passcode in the first message. 5-98 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 149 MESSAGE ANALOG INPUT ESCAPE See page 6–12. [ENTER] for more MESSAGE POWER ESCAPE See page 6–12. [ENTER] for more MESSAGE ENERGY ESCAPE See page 6–13. [ENTER] for more MESSAGE ESCAPE MESSAGE GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 150 (as selected by setpoints) or the options installed in the relay during manu- facture. For example, no display associated with Winding 3 will ever appear if the relay is not configured for three-winding operation. 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 151 STATE: De-energized ESCAPE ↓ OUTPUT RELAY 8 ESCAPE STATE: De-energized MESSAGE SELF-TEST RELAY ESCAPE STATE: Energized MESSAGE The states of Output Relays 1 through 8 and the Self-Test Relay are displayed here. GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 152 FlexLogic™ equation. The FLEXLOGIC EQN EDITOR BAD SETTINGS value displays the cause of a bad setting made while assigning setpoint values. ERROR 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 153 Phase A is always set to 0° as it is used as reference for all other currents, both measured and derived. The maximum specified load and average phase current are also shown for the specified winding. GE Multilin 745 Transformer Management Relay...
Page 154 0 A at 0° Lag MESSAGE W3 ZERO SEQ CURRENT: ESCAPE 0 A at 0° Lag MESSAGE The zero-sequence current magnitudes and phase values for Windings 1, 2, and 3 are shown here. 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 155 W2 GND DIFFERENTIAL ESCAPE CURRENT: 0.00 x CT MESSAGE W3 GND DIFFERENTIAL ESCAPE CURRENT: 0.00 x CT MESSAGE The ground differential current magnitudes for Windings 1 through 3 are shown here. GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 156 (in this case the second harmonic). Similar displays exist for all harmonics up to the 21 The second harmonic magnitude for each phase current of Windings 1 through 3 are displayed. Values are expressed as a percentage of magnitude of the corresponding fundamental frequency component. 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 157 The Harmonic Derating Factor for each of the windings shows the effect of non-sinusoidal load currents on power trans- former’s rated full load current. The calculations are based on ANSI/IEEE standard C57.110-1986. The actual values mes- sages display the harmonic derating factor for Windings 1 through 3. GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 158: Voltage
6-10 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 159: Ambient Temperature
6.3.7 AMBIENT TEMPERATURE PATH: ACTUAL VALUES A2 METERING AMBIENT TEMPERATURE ð AMBIENT TEMP AMBIENT TEMPERATURE: ENTER [ENTER] for more 0°C ESCAPE Ambient temperature is monitored via an RTD connected to the 745. GE Multilin 745 Transformer Management Relay 6-11 Courtesy of NationalSwitchgear.com...
Page 160: Analog Input
Power flowing into the power transformer is designated as source power and power flowing out of the transformer is designated as load power. The messages above are repeated for Windings 2 and 3. 6-12 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 161: Energy
0 Mvarh MESSAGE W1 LOAD VARHOURS: ESCAPE 0 Mvarh MESSAGE The source and load watthours and varhours are displayed for Winding 1. These messages are repeated for Windings 2 and 3. GE Multilin 745 Transformer Management Relay 6-13 Courtesy of NationalSwitchgear.com...
Page 162: A3 Event Recorder
W2 PHASE A CURRENT ESCAPE 0 A at 0° Lag MESSAGE W2 PHASE B CURRENT ESCAPE 0 A at 0° Lag MESSAGE W2 PHASE C CURRENT ESCAPE 0 A at 0° Lag MESSAGE 6-14 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 163 MESSAGE FREQUENCY DECAY ESCAPE RATE: 0.00 Hz/s MESSAGE TAP CHANGER ESCAPE POSITION: n/a MESSAGE VOLTS-PER-HERTZ: ESCAPE 0.00 V/Hz MESSAGE AMBIENT TEMPERATURE: ESCAPE 0°C MESSAGE ANALOG INPUT: ESCAPE 0 µA MESSAGE GE Multilin 745 Transformer Management Relay 6-15 Courtesy of NationalSwitchgear.com...
Page 164 Bad Xfmr Settings IRIG-B Signal Setpt Access Denied Ambnt temperature The recorded event displayed for Logic inputs, Virtual Inputs, and Relay outputs will show the programmed name of the input/output. NOTE 6-16 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 165: A4 Product Info
6 ACTUAL VALUES 6.5 A4 PRODUCT INFO 6.5A4 PRODUCT INFO 6.5.1 TECHNICAL SUPPORT PATH: ACTUAL VALUES A4 PRODUCT INFO TECHNICAL SUPPORT ð TECHNICAL SUPPORT GE Multilin ENTER [ENTER] for more 215 Anderson Avenue ESCAPE Markham, Ontario, ESCAPE Canada, L6E 1B3 MESSAGE...
Page 166: Target And Flash Messages
W3 Harmonic Derating Analog Level 1 Analog Level 2 W1 Current Demand W2 Current Demand W3 Current Demand Xformer Overload Logic Input 1 (to 16) Virtual Input 1 (to 16) 6-18 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 167 Self-Test Error LED • de-energizes the Self-Test Relay • indicates the failure by inserting an appropriate message in the target message queue • records the failure in the Event Recorder GE Multilin 745 Transformer Management Relay 6-19 Courtesy of NationalSwitchgear.com...
Page 168: Flash Messages
This flash message is displayed in response to pressing the decimal key, followed by DEFAULT MESSAGE twice, on one of the selected default messages in the subgroup S1 745 SETUP HAS BEEN REMOVED ENTER DEFAULT MESSAGES 6-20 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 169 This flash message is displayed in response to pressing while on any setpoint SETPOINT ACCESS ENTER message. Setpoint access is restricted because the programmed passcode has not DENIED (PASSCODE) been entered to allow access. GE Multilin 745 Transformer Management Relay 6-21 Courtesy of NationalSwitchgear.com...
Page 170 745 detects an invalid serial number. NUMBER This flash message is displayed when an attempt to upgrade an option was success- PASSCODE VALID - ful. OPTIONS ADJUSTED 6-22 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 171: Communications
7 COMMUNICATIONS 7.1OVERVIEW 7.1.1 PROTOCOLS The GE Multilin 745 Transformer Management Relay communicates with other computerized equipment such as program- mable logic controllers, personal computers, or plant master computers using either the AEG Modicon Modbus protocol or the Harris Distributed Network Protocol (DNP), Version 3.0. Following are some general notes: •...
Page 172: Modbus Protocol
7.2.4 DATA FRAME FORMAT AND DATA RATE One data frame of an asynchronous transmission to or from a GE Multilin 745 consists of 1 start bit, 8 data bits, and 1 stop bit. This produces a 10 bit data frame. The 745 can be configured to include an additional even or odd parity bit if required, producing an 11 bit data frame.
Page 173: Data Packet Format
• FUNCTION CODE: This is the second byte of every message. Modbus defines function codes of 1 to 127. The GE Multilin 745 implements some of these functions. In a master query message the Function Code tells the slave what action to perform.
Page 174: Algorithm
No: go to 3. Yes: continue. A --> CRC GE Multilin will provide a C programming language implementation of this algorithm upon request. NOTE 7.2.7 MESSAGE TIMING Communication message synchronization is maintained by timing constraints. The receiving device must measure the time between the reception of characters.
Page 175: Modbus Functions
7.3.1 SUPPORTED MODBUS FUNCTIONS a) DESCRIPTION The second byte of every message is the function code. Modbus defines function codes of 01h to 7Fh. The GE Multilin SR Series Modbus protocol supports some of these functions, as summarized below. Table 7–1: GE MULTILIN MODBUS FUNCTION CODES...
Page 176 FUNCTION CODE 05H: EXECUTE OPERATION Modbus implementation: Force Single Coil GE Multilin implementation: Execute Operation This function code allows the master to perform various operations in the 745. The 2 byte Code Value of FF00h must be sent after the Operation Code for the operation to be performed.
Page 177 FUNCTION CODE 06H: STORE SINGLE SETPOINT Modbus Implementation: Preset Single Register GE Multilin Implementation: Store Single Setpoint This function code allows the master to modify the contents of a single setpoint register in the addressed slave device. The response of the slave device to this function code is an echo of the entire master query message.
Page 178: Exception Responses
An external device connected to the addressed slave device has failed and the data DEVICE requested cannot be sent. This response will be returned if a GE Multilin device connected to the RS485 external device port of the 745 has failed to respond to the 745.
Page 179: Reading Trace Memory
User Map Value #2 the value at User Map Address #2, and so on. Writing to any User Map Value is only possible if the address stored in the corresponding User Map Address is that of a setpoint value. GE Multilin 745 Transformer Management Relay...
Page 180 Percent Differential Pickup = 0.30 × I DATA #6: high order byte, low order byte 00 1E CRC: low order byte, high order byte 80 F1 CRC computed by slave 7-10 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 181: Function Code Substitutions
NUMBER OF SETPOINTS: high order byte, low order byte 00 01 1 setpoint values = 2 bytes total CRC: low order byte, high order byte 02 31 CRC computed by slave GE Multilin 745 Transformer Management Relay 7-11 Courtesy of NationalSwitchgear.com...
Page 182: Memory Map Organization
2000 to 3FFF Read and write. Trace Memory 4000 to 47FF Read only (except "Trace Buffer Selector Index" and "Trace Channel Selector Index") Playback Memory 4800 to 4FFF Read and write. 7-12 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 183: Modbus Memory Map
FORMAT FACTORY (HEX) VALUE CODE DEFAULT Product ID (Addresses 0000 to 007F) - Read Only PRODUCT ID 0000 GE Product Device Code 33 = 745 0001 Hardware Revision 4 = D 0002 Software Revision 0003 Version Number 000 to 999...
Page 184 Winding 3 Ground Time O/C Flag 0223 Winding 1 Ground Inst O/C 1 Flag 0224 Winding 2 Ground Inst O/C 1 Flag 0225 Winding 3 Ground Inst O/C 1 Flag 7-14 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 185 Virtual Input Assert Flags FLAGS 0262 Output Relay Operate Flags 0263 Virtual Output Operate Flags 0264 Timer Operate Flags 0265 Reserved ↓ ↓ ↓ ↓ ↓ ↓ ↓ 027F Reserved GE Multilin 745 Transformer Management Relay 7-15 Courtesy of NationalSwitchgear.com...
Page 186 0 to 359 ° Lag 02BA Winding 3 Negative Sequence Current Mag 02BB Winding 3 Negative Sequence Current Angle 0 to 359 ° Lag 02BC Winding 1 Zero Sequence Current Magnitude 7-16 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 187 0.0 to 99.9 % ƒo 0306 Winding 3 Phase A 4th Harmonic Content 0.0 to 99.9 % ƒo 0307 Winding 3 Phase B 4th Harmonic Content 0.0 to 99.9 % ƒo GE Multilin 745 Transformer Management Relay 7-17 Courtesy of NationalSwitchgear.com...
Page 188 0.0 to 99.9 % ƒo HARMONIC 0351 Winding 1 Phase B 9th Harmonic Content 0.0 to 99.9 % ƒo 0352 Winding 1 Phase C 9th Harmonic Content 0.0 to 99.9 % ƒo 7-18 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 189 % ƒo 0397 Winding 3 Phase B 13th Harmonic Content 0.0 to 99.9 % ƒo 0398 Winding 3 Phase C 13th Harmonic Content 0.0 to 99.9 % ƒo 0399 Reserved GE Multilin 745 Transformer Management Relay 7-19 Courtesy of NationalSwitchgear.com...
Page 190 0.0 to 99.9 % ƒo 03E3 Winding 2 Phase A 18th Harmonic Content 0.0 to 99.9 % ƒo 03E4 Winding 2 Phase B 18th Harmonic Content 0.0 to 99.9 % ƒo 7-20 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 191 Winding 3 Phase B Total Harmonic Distortion 0.0 to 99.9 % ƒo 0428 Winding 3 Phase C Total Harmonic Distortion 0.0 to 99.9 % ƒo 0429 Reserved ↓ ↓ ↓ ↓ ↓ ↓ ↓ 042F Reserved GE Multilin 745 Transformer Management Relay 7-21 Courtesy of NationalSwitchgear.com...
Page 192 ↓ 047F Reserved LOSS-OF-LIFE 0480 Hottest-spot Winding Temperature –50 to 300 °C 0481 Total Accumulated Loss-of-Life (2 registers) 0 to 200000 hours 0 hours 0483 Aging Factor 0.0 to 2000.0 7-22 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 193 Maximum Event Winding 3 Phase A Current 0819 Maximum Event Winding 3 Phase B Current 081A Maximum Event Winding 3 Phase C Current 081B Maximum Event Winding 3 Ground Current GE Multilin 745 Transformer Management Relay 7-23 Courtesy of NationalSwitchgear.com...
Page 194 0.00 to 655.35 0.01 × CT 0.00 × CT 0864 Event XX Phase C Restraint Current 0.00 to 655.35 0.01 0865 Event XX System Frequency 0.00 to 99.99 0.01 0.00 Hz 7-24 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 195 103D Default Message #15 (2 registers) 103F Default Message #16 (2 registers) 1041 Default Message #17 (2 registers) 1043 Default Message #18 (2 registers) 1045 Default Message #19 (2 registers) GE Multilin 745 Transformer Management Relay 7-25 Courtesy of NationalSwitchgear.com...
Page 196 1 to 20000 220.0 kV 1121 Winding 1 Rated Load 1 to 20000 1000 = 100 MVA 1122 Winding 1 Phase CT Primary 1 to 50000 :1 or :5 A 500 A 7-26 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 197 0 to 65000 0 ms FlexCurve A Delay at 2.70 × PKP 1182 0 to 65000 0 ms FlexCurve A Delay at 2.80 × PKP 1183 0 to 65000 0 ms GE Multilin 745 Transformer Management Relay 7-27 Courtesy of NationalSwitchgear.com...
Page 198 0 to 65000 0 ms FlexCurve A Delay at 17.0 × PKP 11B9 0 to 65000 0 ms FlexCurve A Delay at 17.5 × PKP 11BA 0 to 65000 0 ms 7-28 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 199 12D3 Analog Output 1 Minimum 12D4 Analog Output 1 Maximum 1000 A 12D5 Analog Output 2 Function 0 = Disabled 12D6 Analog Output 2 Value 1 = W1 øB curr GE Multilin 745 Transformer Management Relay 7-29 Courtesy of NationalSwitchgear.com...
Page 200 1 = Closed 134D Logic Input 8 Function 0 = Disabled 134E Logic Input 8 Name (9 registers) "Logic Input 8" 1357 Logic Input 8 Asserted State 1 = Closed 7-30 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 201 Virtual Input 6 Name (9 registers) "Virtual Input 6" 13FC Virtual Input 7 Function 0 = Disabled 13FD Virtual Input 7 Name (9 registers) "Virtual Input 7" 1406 Virtual Input 8 Function 0 = Disabled GE Multilin 745 Transformer Management Relay 7-31 Courtesy of NationalSwitchgear.com...
Page 202 14E0 Output 3 Name (9 registers) "Trip 2" RELAY 3 14E9 Output 3 Operation 0 = self-resetting 14EA Output 3 Type 0 = Trip 14EB Output 3 FlexLogic (20 registers) 7-32 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 203 0 = End 1D81 Timer 1 Pickup Delay 0.00 to 600.00 0.01 0.00 s 1D82 Timer 1 Dropout Delay 0.00 to 600.00 0.01 0.00 s 1D83 Timer 2 Start 0 = End GE Multilin 745 Transformer Management Relay 7-33 Courtesy of NationalSwitchgear.com...
Page 204 0 to 100 1E16 Force Analog Output 6 0 to 100 1E17 Force Analog Output 7 0 to 100 1E18 Reserved ↓ ↓ ↓ ↓ ↓ ↓ ↓ 1E1F Reserved 7-34 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 205 20 = 2.0 × CT 2004 Percent Differential Break Point 1.0 to 20.0 2005 Percent Differential Slope 2 50 to 100 100% 2006 Percent Differential Block 0 = Disabled 2007 Reserved GE Multilin 745 Transformer Management Relay 7-35 Courtesy of NationalSwitchgear.com...
Page 206 2056 Winding 2 Phase Time O/C Block 0 = Disabled 2057 Winding 2 Harmonic Derating Correction 0 = Disabled 2058 Reserved ↓ ↓ ↓ ↓ ↓ ↓ ↓ 205F Reserved 7-36 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 207 Winding 2 Phase Inst O/C 2 Delay 0 to 60000 0 ms 20B4 Winding 2 Phase Inst O/C 2 Block 0 = Disabled 20B5 Reserved ↓ ↓ ↓ ↓ ↓ ↓ ↓ 20BF Reserved GE Multilin 745 Transformer Management Relay 7-37 Courtesy of NationalSwitchgear.com...
Page 208 Winding 2 Neutral Inst O/C 1 Delay 0 to 60000 0 ms 2114 Winding 2 Neutral Inst O/C 1 Block 0 = Disabled 2115 Reserved ↓ ↓ ↓ ↓ ↓ ↓ ↓ 211F Reserved 7-38 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 209 Winding 2 Ground Time O/C Reset 1 = Linear 2176 Winding 2 Ground Time O/C Block 0 = Disabled 2177 Reserved ↓ ↓ ↓ ↓ ↓ ↓ ↓ 217F Reserved GE Multilin 745 Transformer Management Relay 7-39 Courtesy of NationalSwitchgear.com...
Page 210 Winding 3 Ground Inst O/C 2 Pickup 0.05 to 20.00 0.01 21E3 Winding 3 Ground Inst O/C 2 Delay 0 to 60000 0 ms 21E4 Winding 3 Ground Inst O/C 2 Block 0 = Disabled 7-40 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 211 Winding 2 Neg Seq Time O/C Reset 1 = Linear 2266 Winding 2 Neg Seq Time O/C Block 0 = Disabled 2267 Reserved ↓ ↓ ↓ ↓ ↓ ↓ ↓ 226F Reserved GE Multilin 745 Transformer Management Relay 7-41 Courtesy of NationalSwitchgear.com...
Page 212 Underfrequency 2 Block 0 = Disabled 22C6 Underfrequency 2 Current Sensing 1 = Enabled × VT 50 = 0.50 × VT 22C7 Underfrequency 2 Minimum Operating Voltage 0.01 to 0.99 0.01 7-42 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 213 200 = 2.00 s 2306 Volts-Per-Hertz 1 Reset 0.0 to 6000.0 0.0 s 2307 Volts-Per-Hertz 1 Block 0 = Disabled 2308 Reserved ↓ ↓ ↓ ↓ ↓ ↓ ↓ 230F Reserved GE Multilin 745 Transformer Management Relay 7-43 Courtesy of NationalSwitchgear.com...
Page 214 Winding 2 Harm Derating Pickup 0.01 to 0.98 0.01 90 = 0.90 2364 Winding 2 Harm Derating Delay 0 to 60000 10 s 2365 Winding 2 Harm Derating Block 0 = Disabled 7-44 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 215 0 = Disabled CURRENT 23D1 Winding 2 Current Demand Target 0 = Self-reset DEMAND 23D2 Winding 2 Current Demand Pickup 400 A 23D3 Winding 2 Current Demand Block 0 = Disabled GE Multilin 745 Transformer Management Relay 7-45 Courtesy of NationalSwitchgear.com...
Page 216 Trace Buffer XX Channel YY Sample 1 ↓ ↓ ↓ ↓ ↓ ↓ ↓ 4416 Trace Buffer XX Channel YY Sample 1023 4417 Reserved ↓ ↓ ↓ ↓ ↓ ↓ ↓ 47FF Reserved 7-46 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 217 Winding 1/2 Ground Current - RMS Magnitude F81 / F82 GROUND 51B1 Winding 2/3 Ground Current - RMS Magnitude F82 / F83 CURRENTS 51B2 Reserved ↓ ↓ ↓ ↓ ↓ ↓ ↓ 51BF Reserved GE Multilin 745 Transformer Management Relay 7-47 Courtesy of NationalSwitchgear.com...
Page 218: Memory Map Data Formats
(0 = Energized, 1 = De-energized) 0 to 9 in steps of 1 xxxx xxxx xxxx xx1x Transformer Overload Example: Revision 2.83 stored as 0283 hex (0 = Normal, 1 = Overload) 7-48 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 219 0000 0000 1001 9 = W1 Phase Inst 2 OC xxxx 0000 0100 0010 66 = Logic Input 1 xxxx 0000 0000 1010 10 = W2 Phase Inst 2 OC GE Multilin 745 Transformer Management Relay 7-49 Courtesy of NationalSwitchgear.com...
Page 220 0000 0000 0001 0101 21 = D/z0° xxxx 0000 0111 1001 121 = Logic Input Reset 0000 0000 0001 0110 22 = D/z60° xxxx 0000 0111 1010 122 = Front Panel Reset 7-50 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 221 76 = D/d120°/d120° 0000 0000 0000 0101 5 = 19200 Baud 0000 0000 0100 1101 77 = D/d120°/d180° 32 bits DEFAULT MESSAGE 0000 0000 0100 1110 78 = D/d120°/y150° ---- Internally Defined GE Multilin 745 Transformer Management Relay 7-51 Courtesy of NationalSwitchgear.com...
Page 222 3 = Winding 3 0000 0000 0010 0000 32 = W2 øC Demand 0000 0000 0010 0001 33 = W3 øA Demand 0000 0000 0010 0010 34 = W3 øB Demand 7-52 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 223 60 = Winding 3 Harmonic Derating 0000 0101 5 = Inst Differential 0011 1101 61 = Hottest-Spot Temperature Limit 0000 0110 6 = Winding 1 Phase Time O/C 0011 1110 62 = Loss-Of-Life Limit GE Multilin 745 Transformer Management Relay 7-53 Courtesy of NationalSwitchgear.com...
Page 224 7 = Output Relay 8 (0 = De-energized, 1 = Energized) 0000 1000 8 = Self-Test Relay 0000 1110 xxxx xxxx Token = Virtual Output Operated 0000 0000 0 = Virtual Output 1 7-54 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 225 21 = 'Help' xxxx xxxx xxxx 1xxx Virtual Output 4 (0 = Not Operated, 1 = Operated) xxxx xxxx xxx1 xxxx Virtual Output 5 (0 = Not Operated, 1 = Operated) GE Multilin 745 Transformer Management Relay 7-55 Courtesy of NationalSwitchgear.com...
Page 226 0000 0000 0000 1001 9 = W1/2 Ig 0000 0000 0000 0001 1 = 2nd+5th 0000 0000 0000 1010 10 = W2/3 Ig 0000 0000 0000 1011 11 = Voltage 7-56 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 227 12 = Virtual Output 3 Format: Unsigned value, scaled by 10 0000 0000 0000 1101 13 = Virtual Output 4 Example: 12340 stored as 1234 0000 0000 0000 1110 14 = Virtual Output 5 GE Multilin 745 Transformer Management Relay 7-57 Courtesy of NationalSwitchgear.com...
Page 228 4 = Logic Input 4 0000 0000 0000 0011 3 = Inv Curve 3 0000 0000 0000 0101 5 = Logic Input 5 0000 0000 0000 0110 6 = Logic Input 6 7-58 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 229 Format: Signed value Example: 1234 stored as 1234 0000 0000 0001 0101 19 = 21st For CT PRIMARY > 2000 A Format: Signed value, scaled by 10 Example: 12340 stored as 1234 GE Multilin 745 Transformer Management Relay 7-59 Courtesy of NationalSwitchgear.com...
Page 230 Unsigned Value, 2 Decimal Places Example: 12.34 stored as 1234) F102 16 bits DATA LINK CONFIRMATION MODE 0000 0000 0000 0000 0=Never 0000 0000 0000 0001 1=Sometimes 0000 0000 0000 0010 2=Always 7-60 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 231: Dnp Communications
Sometimes Configurable (For an explanation of the above, refer to the discussion accompanying Binary Output/Control Relay Output point list) Queue Never Always Sometimes Configurable Clear Queue Never Always Sometimes Configurable GE Multilin 745 Transformer Management Relay 7-61 Courtesy of NationalSwitchgear.com...
Page 232 The data link layer confirmation mode, confirmation timeout, and number of retries are all configurable. Refer to the setpoints defined under for more details (refer to Section 5.3.4: DNP Communications on page S1 745 SETUP 5–25.) 7-62 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 233: Implementation Table
The point tables for Binary Input and Analog Input objects contain a field which defines to which event class the corre- sponding static data has been assigned. For this object, the qualifier code must specify an index of 7 only. GE Multilin 745 Transformer Management Relay 7-63...
Page 234: Dnp Point Lists
Class 1 Note 1 Setpoint Group 4 Active Class 1 Note 1 Notes: Any detected change in the state of any point will cause the generation of an event object. 7-64 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 235 When using object 10 to read the status of a Binary Output, a read of point 0 will always return zero. For other points, the current state of the corresponding Virtual Input will be returned. GE Multilin 745 Transformer Management Relay 7-65 Courtesy of NationalSwitchgear.com...
Page 236 Winding 1 Negative Sequence Current Magnitude Class 1 Note 6 Winding 2 Negative Sequence Current Magnitude Class 1 Note 7 Winding 3 Negative Sequence Current Magnitude Class 1 Notes 5,8 7-66 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 237 Winding 3 Real Power Class 1 Note 5,8 Winding 3 Reactive Power Class 1 Note 5,8 Winding 3 Apparent Power Class 1 Note 5,8 Winding 3 Power Factor Class 1 Note 5 GE Multilin 745 Transformer Management Relay 7-67 Courtesy of NationalSwitchgear.com...
Page 238 Refer to the section in this chapter titled Accessing Data Via The User Map for more information. Please note that changes in User Map Values never generate event objects. 7-68 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 239: Commissioning
Differential, which will almost always be enabled. If, for some reasons, this element is not enabled when the relay is in service, you will need to test the Local/Remote Reset when testing another protection element. GE Multilin 745 Transformer Management Relay...
Page 240: Safety Precautions
• The ground current is the current signal measured by means of a CT in the power transformer connection to ground. 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 241: Test Equipment
With only I connected (with a return path) the pickup level of any element can be measured. Figure 8–1: TEST SETUP GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 242: Preliminary Work
It is necessary to keep track of modifications/changes made to settings during the course of these com- missioning steps and ensure that all settings are returned to the "in-service" values at the end of the tests, prior to placing the relay into service. CAUTION 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 243: Dielectric Strength Testing
Low voltage inputs (< 30 V) such as RTDs, analog inputs, analog outputs, digital inputs, and RS485 communication ports are not to be tested for dielectric strength under any circumstance. GE Power Management Figure 8–2: TESTING FOR DIELECTRIC STRENGTH...
Page 244: Logic Inputs And Output Relays
Now return all output forcing to "De-energized" and disable the relay forcing function by setting S6 TESTING OUTPUT to "Disabled" RELAYS FORCE OUTPUT RELAYS FUNCTION All the output relays should reset. 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 245: Display, Metering, Communications, And Analog Outputs
Now, lower the current amplitude while displaying the system frequency. Verify that the frequency is displayed correctly with current levels down to approximately 50 mA rms input. Decrease current to 0 A. GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 246: Voltage Input
Table 5–1: Transformer Types on page 5–10 shows that the Y-side currents are shifted by 30° to match the Delta secondary side. The 30° phase shift is obtained from the equations below: 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 247: Ambient Temperature Input
Compare the displayed value of temperature against known temperature at the location of the sensor. Use a thermom- eter or other means of obtaining actual temperature. An alternative approach is to perform a more detailed calibration per the procedure outlined below. GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 248 A2 METERING AMBIENT TEMP AMBIENT TEMPERATURE ature. Verify that values entered for other months do not affect the value for the present month. 8-10 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 249: Analog Outputs
Adjust the resistance to simulate the minimum tap position and verify that a "1" is displayed. Now gradually increase the resistance up to the value which represents the maximum tap value, verifying that the tap position indicator tracks the resistance. GE Multilin 745 Transformer Management Relay 8-11...
Page 250: Protection Schemes
The above tests have effectively verified the minimum operating level of the three harmonic restrained differential elements. If desired the above measurements may be repeated for the phase inputs for the other winding(s). The results should be identical. 8-12 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 251 Close the switch and set the current level to 3 times the minimum pickup value measured earlier. Re-open the switch and reset all targets on the relay. Ensure that timer circuit functions correctly. GE Multilin 745 Transformer Management Relay 8-13...
Page 252 This is caused by the current values moving into the slope 2 region. Continue increasing I until the element operates again. Compute the slope 2 value at this point. 8-14 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 253 Connect the test setup as below to supply the Phase A element. Set the fundamental current level to the CT rated sec- ondary value. The harmonic restraint differential element of Phase A should be operated. GE Multilin 745 Transformer Management Relay 8-15 Courtesy of NationalSwitchgear.com...
Page 254 Apply current to operate the differential element then assert Logic Input 1. Verify that the element has reset and that all targets can be reset. With Logic Input 1 asserted, remove the current and reapply. Verify that the element did not operate. 8-16 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 255: Instantaneous Differential Protection
The settings for these elements are found in the setpoints page. S4 ELEMENTS PHASE OC GE Multilin 745 Transformer Management Relay 8-17 Courtesy of NationalSwitchgear.com...
Page 256 A precise measurement of the reset time requires a relay test set capable of dynamic operation, with three sequenced stages, each with programmable current levels and time duration external contact, and flexible triggering. To perform such a test, please contact GE Multilin for detailed test instructions. 8-18...
Page 257: Phase Instantaneous Overcurrent
Phases B and C of Winding 1. For Phase B, X = H2 and Y = G2. For Phase C, X = H3 and Y = G3. The displayed message should change to indicate the correct phase, winding, and element that operated. GE Multilin 745 Transformer Management Relay 8-19 Courtesy of NationalSwitchgear.com...
Page 258: Neutral Time Overcurrent
Trip and Message LEDs should remain on if the was selected as "Latched". W1 NEUTRAL TIME OC TARGET Otherwise only the Trip LED remains on. Reset indicators and clear messages. 8-20 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 259: Neutral Instantaneous Overcurrent
A precise measurement of the reset time requires a relay test set capable of dynamic operation, with three sequenced stages, each with programmable current levels and time duration, and flexible external contact triggering. To perform such a test, contact GE Multilin for detailed test instructions. A simple verification of the reset mode selected by...
Page 260: Ground Time Overcurrent
This reset level for the cur- rent should be approximately 98% of the pickup level. Once the relay drops out, slowly increase the current until the 8-22 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 261 A precise measurement of the reset time requires a relay test set capable of dynamic operation, with three sequenced stages, each with programmable current levels and time duration, and flexible external contact triggering. To perform such a test, contact GE Multilin for detailed test instructions. A simple verification of the reset mode selected with the...
Page 262: Ground Instantaneous Overcurrent
Disable all protection features except Ground IOC 2. Make the appropriate changes for the display indications and output relays operated by the Ground IOC 2 elements. 8-24 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 263: Restricted Ground Fault
WINDING 1 ELEMENT: To ensure that only the Restricted Ground Fault element operates the trip relays (and any other output relays selected by the logic) disable all protection features except Restricted Ground Fault. GE Multilin 745 Transformer Management Relay 8-25...
Page 264 Calculate the slope at this point. Decrease the slope setting to 0% then continue to increase the I current until the element resets. Slowly increase I until the element operates again. 8-26 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 265: Negative Sequence Time Overcurrent
Trip and Message LEDs should remain on if the was selected as "Latched". W1 NEG SEQ TIME OC TARGET Otherwise only the Trip LED remains on. Reset indicators and clear messages. GE Multilin 745 Transformer Management Relay 8-27 Courtesy of NationalSwitchgear.com...
Page 266: Negative Sequence Instantaneous Overcurrent
W1 NEG SEQ INST OC PICKUP With current applied to a single phase, the negative sequence current component is calculated from: × NOTE -- - (EQ 8.15) neg seq phase 8-28 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 267: Frequency
As a preliminary step, disable all protection functions except Underfrequency 1. Verify that settings match the in-service requirements. Settings are entered or modified in the settings menu. S4 ELEMENTS FREQUENCY UNDERFREQUENCY 1 GE Multilin 745 Transformer Management Relay 8-29 Courtesy of NationalSwitchgear.com...
Page 268 60.00 Hz (or 50.00 Hz) and the amplitude to the rated CT secondary current. Monitor the appropriate trip and auxiliary relays. Reset all alarms and indications. The display should remain unchanged with no trip indications. 8-30 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 269 Slowly increase the frequency until the output relay(s) operate. Check that the frequency at which operation took place is the selected frequency setting. As the frequency is varied, verify that the A2 METERING FREQUENCY SYSTEM actual value indicates the correct value of system frequency. FREQUENCY GE Multilin 745 Transformer Management Relay 8-31 Courtesy of NationalSwitchgear.com...
Page 270 0.03 Hz. Check that the Trip LED is still on. The trip message stays on if the OVERFRE- setting is "Latched"; if it is "Self-resetting", the message resets when frequency is below the setpoint. QUENCY TARGET 8-32 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 271 A high-quality programmable function generator is required to verify this element. Since the frequency rates of change are measured over a narrow range, the test instrumentation must accurately simulate frequency decay rates without any significant jitter. It is the experience of GE Multilin that some commercial dedicated relay test NOTE equipment with built-in frequency ramping functions is not accurate enough to verify the 745 performance.
Page 272: Overexcitation
This test requires a current generator capable of producing a fundamental and 5th harmonic component. Connect the current signal to H1 and G1 and set the fundamental component level above the threshold setting. 8-34 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 273: Insulation Aging
Calculate that the resistance at which the element operated is 150% of the resistance that would be present at the maximum tap position. Verify all relay, targets and messages for correct operation per programmed values. GE Multilin 745 Transformer Management Relay 8-35...
Page 274: Auxiliary Protection And Monitoring Functions
. These values represent the fundamental component only. CAUTION RENT OTHER THD ELEMENTS: A THD element can be programmed for each winding of the transformer. Use the above procedure to verify the element(s) on the other winding(s). 8-36 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 275: Harmonic Derating Function
S4 ELEMENTS XFORMER OVERLOAD TRANSFORMER OVERLOAD DELAY The blocking from logic input, if enabled, can be tested as described in earlier tests for other elements. NOTE GE Multilin 745 Transformer Management Relay 8-37 Courtesy of NationalSwitchgear.com...
Page 276 Energize the relay power supply and verify that the Relay In Service LED is ON, and that the Self-Test Error LED is OFF, establishing that the relay is operating normally. 8-38 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...
Page 277 First Year of Manufacture: 1998 I the undersigned, hereby declare that the equipment specified above conforms to the above Directives and Standards Full Name: John Saunders Position: Manufacturing Manager Signature: Place: GE Multilin Date: 1998 GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 278 24 months from date of ship- ment from factory. In the event of a failure covered by warranty, GE Multilin 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 279 ..............5-89, 5-90 ..............6-11 actual values ................5-89 gates ................ 5-85 setpoints ..............5-88 input types CURRENT METERING ......... 6-5, 6-6, 6-7 ..............5-88 introduction ..............5-88 output types GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 280 ..............4-4 ................4-4 reset key ..............4-3 setpoint key ................ 4-4 value keys GE TYPE IAC CURVES ............ 5-52 KNEEPOINT ..............8-15 GROUND INDICATOR ............4-3 GROUND INSTANTANEOUS OVERCURRENT setpoints ................ 5-61 ................8-24 testing GROUND OVERCURRENT SETPOINTS ......5-59...
Page 281 REMOTE RESET MODE ........... 8-13 PASSCODE RESET KEY ............... 4-4 ..............2-5, 2-6 changing RESETTING ..............5-26 ..............2-5, 2-6 security RESISTANCE GROUNDED WYE WINDING ...... 5-62 ................ 5-23 setpoints PERCENT DIFFERENTIAL RESTRICTED GROUND GE Multilin 745 Transformer Management Relay Courtesy of NationalSwitchgear.com...
Page 282 WYE / DELTA TRANSFORMER .......... 5-8 STATUS INDICATORS ............4-2 SYSTEM STATUS INDICATORS ......... 4-3 ZERO-SEQUENCE COMPONENT REMOVAL ....5-9, 8-9 ZERO-SEQUENCE CT INSTALLATION ......3-9 TAP CHANGER ..............6-10 TAP CHANGER FAILURE ..........5-87 745 Transformer Management Relay GE Multilin Courtesy of NationalSwitchgear.com...

GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual

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