Page 1 ® Relion 650 SERIES Transformer protection RET650 Version 1.1 IEC Application manual...
Page 4 Copyright This document and parts thereof must not be reproduced or copied without written permission from ABB Power Grids, and the contents thereof must not be imparted to a third party, nor used for any unauthorized purpose. The software and hardware described in this document is furnished under a license and may be used or disclosed only in accordance with the terms of such license.
Page 5 This document has been carefully checked by ABB Power Grids but deviations cannot be completely ruled out. In case any errors are detected, the reader is kindly requested to notify the manufacturer.
Page 6 (Low-voltage directive 2006/95/EC). This conformity is the result of tests conducted by ABB in accordance with the product standards EN 50263 and EN 60255-26 for the EMC directive, and with the product standards EN 60255-1 and EN 60255-27 for the low voltage directive.
Page 7: Table Of Contents
OC4PTOC ..........................40 3.1.6.1 Calculating general settings ................... 40 3.1.6.2 Calculating settings for step 1..................40 3.1.7 Calculating settings for four step phase overcurrent protection, LV-side OC4PTOC ..........................42 Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 8 Display............................73 5.1.2 LEDs............................75 5.1.3 Keypad............................75 5.1.4 Local HMI functionality......................78 5.1.4.1 Protection and alarm indication..................78 5.1.4.2 Parameter management ....................80 5.1.4.3 Front communication......................80 Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 9 Identification...........................109 8.1.2 Application..........................109 8.1.3 Setting guidelines........................109 8.1.3.1 Meshed network without parallel line................110 8.1.3.2 Meshed network with parallel line..................111 Four step phase overcurrent protection OC4PTOC............112 Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 10 Negative sequence based overcurrent function DNSPTOC..........147 8.9.1 Identification........................... 147 8.9.2 Application..........................147 8.9.3 Setting guidelines........................147 Section 9 Voltage protection..................149 Two step undervoltage protection UV2PTUV ..............149 9.1.1 Identification...........................149 9.1.2 Application..........................149 Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 11 Rate-of-change frequency protection SAPFRC..............163 10.3.1 Identification...........................163 10.3.2 Application..........................163 10.3.3 Setting guidelines........................164 Section 11 Secondary system supervision..............165 11.1 Breaker close/trip circuit monitoring TCSSCBR..............165 11.1.1 Identification...........................165 11.1.2 Application..........................165 Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 12 Identification.......................... 209 14.1.2 Application..........................209 14.1.2.1 Three-phase tripping ......................209 14.1.2.2 Lock-out..........................210 14.1.2.3 Blocking of the function block..................210 14.1.3 Setting guidelines........................210 14.2 Trip matrix logic TMAGGIO......................211 Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 13 15.3.3 Setting guidelines........................218 15.4 Measurements...........................218 15.4.1 Identification...........................218 15.4.2 Application..........................219 15.4.3 Setting guidelines........................220 15.4.4 Setting examples........................222 15.4.4.1 Measurement function application for a 400 kV OHL..........223 Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 14 Section 17 Station communication................241 17.1 IEC61850-8-1 communication protocol ................241 17.1.1 Identification...........................241 17.1.2 Application..........................241 17.1.2.1 Horizontal communication via GOOSE................ 242 17.1.3 Setting guidelines........................245 17.2 DNP3 protocol...........................245 Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 15 Identification.......................... 256 18.10.2 Application..........................256 18.10.3 Setting guidelines........................256 18.11 Global base values GBASVAL....................257 18.11.1 Identification...........................257 18.11.2 Application..........................257 18.11.3 Setting guidelines........................257 18.12 Authority check ATHCHCK......................257 Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 16 TPS (and old British Standard, class X).............. 267 19.1.7.3 Current transformers according to ANSI/IEEE............268 19.2 Voltage transformer requirements..................268 19.3 SNTP server requirements......................269 Section 20 Glossary....................... 271 Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 17: Introduction
Technical manual Technical manual Communication protocol Communication protocol Communication protocol manual manual manual en07000220.vsd IEC07000220 V1 EN-US Figure 1: The intended use of manuals in different lifecycles Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 18: Document Revision History
GUID-52A4699C-F83B-48F8-BF4E-D853043AB731 v2.1.1 Document revision/date Product series version History -/April 2011 First release Maintenance release - Updated safety A/November 2019 information and bug corrections Maintenance release B/May 2020 Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 19: Related Documents
The information icon alerts the reader of important facts and conditions. The tip icon indicates advice on, for example, how to design your project or how to use a certain function. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 20: Manual Conventions
The * character after an input or output signal name in the function block symbol given for a function, indicates that the signal must be connected to another function block in the application configuration to achieve a valid application configuration. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 21: Application
Other signals need to be applied as required for each application. The graphical configuration tool ensures simple and fast testing and commissioning. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 22 DRP RDRE IEC61850 IEC61850 IEC61850 IEC61850 IEC61850 IEC61850 IEC61850 IEC61850 IEC20000112.vsd IEC20000112 V1 EN-US Figure 2: A typical protection application for a transformer backup protection arrangement Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 23 TCS SCBR SPVN ZBAT DRP RDRE IEC61850 IEC61850 IEC09000645-2-en.vsd IEC09000645 V2 EN-US Figure 3: A typical protection application for a two-winding transformer in single breaker arrangement Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 24 TCS SCBR SPVN ZBAT DRP RDRE IEC61850 IEC61850 IEC09000646-2-en.vsd IEC09000646 V2 EN-US Figure 4: A typical protection application for a three-winding transformer in single breaker arrangement Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 25 Mont. IEC61850 IEC61850 TCS SCBR SPVN ZBAT DRP RDRE IEC09000647-2-en.vsd IEC09000647 V2 EN-US Figure 5: A typical tap changer control application for one or two transformers Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 26: Available Functions
Directional overpower protection DNSPTOC Negative sequence based overcurrent function Voltage protection UV2PTUV Two step undervoltage protection OV2PTOV Two step overvoltage protection Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 27: Control And Monitoring Functions
Function commands generic for IEC60870-5-103 I103POSCMD IED commands with position and select for IEC60870-5-103 Secondary system supervision TCSSCBR Breaker close/trip circuit monitoring Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 28 Analog input signals BxRBDR Binary input signals SPGGIO IEC 61850 generic communication I/O functions SP16GGIO IEC 61850 generic communication I/O functions 16 inputs Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 29: Designed To Communicate
LAN1 GOOSEINTLKRCV Horizontal communication via GOOSE for interlocking GOOSEBINRCV GOOSE binary receive GOOSEVCTRCONF GOOSE VCTR configuration for send and receive Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 30: Basic Ied Functions
Summation block 3 phase GBASVAL Global base values for settings ATHSTAT Authority status ATHCHCK Authority check FTPACCS FTP access with password Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 31: Ret650 Application Examples
High voltage solidly earthed • Medium voltage high impedance earthed RET650 Ph-Ph IEC09000435-1-en.vsd IEC09000435 V1 EN-US Figure 6: Two-winding HV/MV transformer, Y/Δ-transformer; HV:solidly earthed, MV:high impedance earthed Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 32: Two-Winding Hv/Mv, Y/Y-Transformer
The proposal for functionality choice for the different application cases are shown in table 3. In the table the recommendations has the following meaning: On: It is recommended to have the function activated in the application Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 33 Pole discordance protection CCRPLD Application dependent Application dependent Directional under-power protection Application dependent Application dependent GUPPDUP Directional over-power protection Application dependent Application dependent GOPPDOP Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 34: Three-Winding Hv/Mv1/Mv2, Y/Y/Δ-Transformer
Medium voltage 1 solidly earthed • Medium voltage 2 high impedance earthed RET650 IEC09000437-1-en.vsd IEC09000437 V1 EN-US Figure 8: Three-winding HV/MV1/MV2, Y/Y/Δ-transformer; HV:solidly earthed, MV1:solidly earthed, MV2:high impedance earthed Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 35: Three-Winding Hv/Mv1/Mv2, Y/Y/Δ-Transformer
500 – 10 000 MVA Short circuit power level infeed at MV1-side 0 – 5 000 MVA Short circuit power level infeed at MV2-side 0 – 5 000 MVA Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 36: Functionality Table
Application dependent Application dependent on MV1-side) Thermal overload protection, two time constants TRPTTR (instance 3 Application dependent Application dependent on MV2-side) Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 37 Application dependent Application dependent Rate-of-change of frequency protection SAPFRC Application dependent Application dependent Breaker close/trip circuit monitoring TCSSCBR Automatic voltage control for tap changer, single control TR1ATCC Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 39: Ret650 Setting Examples
Low zero sequence source impedance at the HV side j15 Ω Positive sequence source impedance at the LV side ∞ (no generation in the 22 kV network) Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 40: Calculating General Settings For Analogue Inputs 8I 2U
Set the 145 kV neutral point current transformer input 7. 5.1. CTStarPoint7 to ToObject (The CT secondary is earthed towards the protected line) CTSec7 to 1 A 5.2. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 41: Calculating Settings For Global Base Values Gbasval
Global base values for setting function for reference of primary values. 3.1.3 Calculating settings for transformer differential protection T2WPDIF GUID-AA4F92CD-2110-48AB-8072-2B374841BB46 v2 GlobalBaseSelW1 to 1 (HV) GlobalBaseSelW2 to 2 (LV) Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 42 EndSection1 , EndSection2 , SlopeSection2 and SlopeSection3 . The settings of EndSection1 , EndSection2 , SlopeSection2 and SlopeSection3 are defined as advanced and the default values are recommended. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 43 This corresponds to 1.471 times the rated current. The low voltage side current is 1.25 times the rated current and thus the differential current is about 0.22 times the rated transformer current. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 44: Calculating Settings For Restricted Earth Fault Protection Refpdif
The restricted earth fault protection is applied to the 145 kV winding as shown in figure 12. Restricted earth-fault protection IEC09000448-1-en.vsd IEC09000448 V1 EN-US Figure 12: Restricted earth fault protection application Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 45: Calculating Settings For Instantaneous Phase Overcurrent Protection, Hv-Side, Phpioc
This factor is less that 5 %. The setting is chosen with a safety margin of 1.2: ≥ 1.2 · 1.05 · 1 830 = 2 306 A Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 46: Calculating Settings For Four Step Phase Overcurrent Protection, Hv-Side, Oc4Ptoc
130 % of the rated power during limited time. Further shall the protection resetting ratio be considered. The resetting ratio is 0.95. The minimum setting can be calculated as: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 48: Calculating Settings For Four Step Phase Overcurrent Protection, Lv-Side Oc4Ptoc
Different time delay principles can be used. This is due to different praxis. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 49: Calculating General Settings
0.23 0.97 (Equation 13) GUID-846C7A33-F976-45DF-95E9-75124D6A24D2 V1 EN-US IBase with corresponds to 7 875 A primary current. The setting is chosen to 5 t1 to 0.1 s Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 50: Calculating Settings For Step 2
The transformer impedance, referred to 22 kV level, is: The phase-to-phase fault current can be calculated: 22000 / 3 × sc ph 0.23 0.97 3 (Equation 16) GUID-BAA8989B-EF8F-4277-9B2B-EBBCA35ED7C2 V1 EN-US Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 51: Calculating Settings For Four Step Residual Overcurrent Protection Hv-Side Ef4Ptoc
In order to achieve setting that assure selective fault clearance a large number of calculations have to be made with different fault Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 52: Calculating General Settings
Set operating residual current level and time delay IN1> to 650% of IBase , corresponding to 1553 A Faults are applied at the 145 kV busbar as shown in figure 18. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 53 The residual current from the transformer at phase-to-phase to earth-fault and minimum short circuit power is: × × 3 145 × × × × + × + × 10 2 (Equation 21) GUID-933BE756-31CD-45BA-B3EB-5DC00CA25DC0 V1 EN-US Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 54: Calculating Settings For Step 2
IN> 22kV RET650 145kV Ph-Ph IEC09000456-1-en.vsd IEC09000456 V1 EN-US Figure 20: Fault calculation for sufficient reach of the 145 kV residual overcurrent protection Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 55: Calculating Settings For Step 4
10 A earth-fault current at zero resistance earth-fault. This means that the resistance is 22000 1270 (Equation 22) GUID-4ECDF824-B17E-436D-A668-ACA06BB375F7 V2 EN-US The total zero sequence impedance of the 22 kV system is Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 56: Calculating Settings For Breaker Failure Protection Hv-Side, Ccrbrf
In the current measurement the three-phase currents out on the line is used. It is also possible to measure the residual current (analogue input 4). The logics to detect failure of the circuit breaker can be chosen: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 57: Calculating Settings For Breaker Failure Protection Lv-Side Ccrbrf
The breaker failure protection can use either contact function in the circuit breaker or current measurement to detect correct breaker function. For line protections it seems to be most suitable function is to use current measurement breaker check. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 58 Minimum back-up trip delay t2 Critical fault clearance time for stability Time Trip and Start en05000479.vsd EN05000479 V1 EN-US Figure 22: Time sequences for breaker failure protection setting Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 59: Analog Inputs
For directional functions the direction into the object is defined as Forward and the direction out from the object is defined as Reverse. See figure Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 60: Example 1
CT direction shall be done according to the figure. To protect the line the direction of the Forward . This means that the directional functions of the line protection shall be set to protection is looking towards the line. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 61: Example 2
Examples how to connect, configure and set CT inputs for most commonly used CT connections SEMOD55055-296 v3 Figure defines the marking of current transformers terminals commonly used around the world: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 62: Example How To Connect Star Connected Three-Phase Ct Set To The Ied
IED. For correct connections, see the connection diagrams valid for the delivered IED. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 63 DFTReference shall be set accordingly. Another alternative is to have the star point of the three-phase CT set as shown in figure 28: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 64: Example How To Connect Delta Connected Three-Phase Ct Set To The Ied
It as well gives overview of required actions by the user in order to make this measurement available to the built-in protection and control functions within the IED. For correct connections, see the connection diagrams valid for the delivered IED. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 65 DFTReference shall be set accordingly. Another alternative is to have the delta connected CT set as shown in figure 30: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 66: Example How To Connect Single-Phase Ct To The Ied
IED. For correct connections, see the connection diagrams valid for the delivered IED. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 67 1MRK 504 124-UEN B Section 4 Analog inputs Protected Object SMAI_20 IEC11000029-1-en.vsd IEC11000029 V1 EN-US Figure 31: Connections for single-phase CT input Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 68: Setting Of Voltage Channels
Consider a VT with the following data: (Equation 25) EQUATION2016 V1 EN-US VTprim=132 (value in kV) VTsec=110 (value in V) The following setting should be used: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 69: Examples How To Connect, Configure And Set Vt Inputs For Most Commonly Used Vt Connections
It as well gives overview of required actions by the user in order to make this measurement available to the built-in protection and control functions within the IED. For correct connections, see the connection diagrams valid for the delivered IED. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 70 Section 4 1MRK 504 124-UEN B Analog inputs SMAI_20 IEC11000031-1-en.vsd IEC11000031 V1 EN-US Figure 33: Three phase-to-earth connected VTs Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 71: Example How To Connect Two Phase-To-Phase Connected Vts To The Ied
VT connection is only used on lower voltage levels (that is, rated primary voltage below 40 kV). For correct connections, see the connection diagrams valid for the delivered IED. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 72 If frequency tracking and compensation is required (this feature is typically required only for IEDs DFTReference shall be set installed in the generating stations) then the setting parameters accordingly. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 73: Example How To Connect The Open Delta Vt To The Ied For High Impedance Earthed Or Unearthed
For correct connections, see the connection diagrams valid for the delivered IED. SMAI_20 +3Uo IEC11000033-1-en.vsd IEC11000033 V1 EN-US Figure 35: Open delta connected VT in high impedance earthed power system Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 74: Example How To Connect The Open Delta Vt To The Ied For Low Impedance Earthed Or Solidly Earthed Power Systems
In case of a solid earth fault close to the VT location the primary value of 3Uo will be equal to: Ph Ph Ph E (Equation 31) EQUATION1926 V1 EN-US Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 75 For correct connections, see the connection diagrams valid for the delivered IED. SMAI_20 +3Uo IEC11000035-1-en.vsd IEC11000035 V1 EN-US Figure 36: Open delta connected VT in low impedance earthed power system Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 76: Example How To Connect The Neutral Point Vt To The Ied
VT connection presents secondary voltage proportional to Uo to the IED. In case of a solid earth fault in high impedance earthed or unearthed systems the primary value of Uo voltage will be equal to: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 77 IED. For correct connections, see the connection diagrams valid for the delivered IED. Protected Object SMAI_20 IEC11000036-1-en.vsd IEC11000036 V1 EN-US Figure 37: Neutral point connected VT Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 78 If frequency tracking and compensation is required (this feature is typically required only for IEDs DFTReference shall be set installed in the generating stations) then the setting parameters accordingly. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 79: Local Human-Machine Interface
The amount of characters and rows fitting the view depends on the character size and the view that is shown. The display view is divided into four basic areas. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 80 The LED is connected to the required signal with PCM600. GUID-11D6D98C-A2C9-4B2C-B5E0-FF7E308EC847 V1 EN-US Figure 40: Function button panel The alarm LED panel shows on request the alarm text labels for the alarm LEDs. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 81: Leds
The push-buttons are also used to acknowledge alarms, reset indications, provide help and switch between local and remote control mode. The keypad also contains programmable push-buttons that can be configured either as menu shortcut or control buttons. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 82 Section 5 1MRK 504 124-UEN B Local human-machine interface GUID-23A12958-F9A5-4BF1-A31B-F69F56A046C7 V2 EN-US Figure 42: LHMI keypad Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 83 Figure 43: LHMI keypad with object control, navigation and command push-buttons and RJ-45 communication port 1...5 Function button Close Open Escape Left Down Right Enter Remote/Local Uplink LED Not in use Multipage Menu Clear Help Communication port Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 84: Local Hmi Functionality
The 15 programmable three-color LEDs are used for alarm indication. An individual alarm/ status signal, connected to any of the LED function blocks, can be assigned to one of the three LED colors when configuring the IED. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 85 T2 VOLTAGE TRIP GRP2_LED3 Yellow LED T2 POSERRAL GRP2_LED4 Yellow LED T2 CMDERRAL GRP2_LED5 Yellow LED T2 TCERRAL GRP2_LED6 Yellow LED T2 CONVERR Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 86: Parameter Management
The RJ-45 port in the LHMI enables front communication. • The green uplink LED on the left is lit when the cable is successfully connected to the port. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 87: Single-Line Diagram
Do not connect the IED front port to LAN. Connect only a single local PC with PCM600 to front port. 5.1.4.4 Single-line diagram GUID-2CB16ADA-AF80-42FA-9485-BC7FD33DAEC6 v2 Single-line diagram for RET650 IEC10000182 V1 EN-US Figure 45: Single-line diagram for RET650 (A01) Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 89: Differential Protection
• zero sequence currents that only flow on one side of the power transformer • normal magnetizing currents • magnetizing inrush currents • overexcitation magnetizing currents Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 90: Setting Guidelines
The second slope is increased to ensure stability under heavy through fault Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 91 For differential applications on HV shunt reactors, due to a fact that there is no heavy IdUnre through-fault conditions, the unrestrained differential operation level can be set to 1.75pu Overall operating characteristic of transformer differential protection is shown in figure 46. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 94: Differential Current Alarm
The IED can be used for differential protection of three-phase power transformers with main CTs either star or delta connected. However the IED has been designed with assumption that Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 95 IED YNd1 IEC06000559 V1 EN-US Dyn1 IEC06000560 V1 EN-US YNd11 IEC06000561 V1 EN-US Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 96: Restricted Earth-Fault Protection, Low Impedance Refpdif
A high gas pressure may develop, damaging the transformer tank. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 97: Application Examples
Application examples Transformer winding, solidly earthed M13048-3 v4 The most common application is on a solidly earthed transformer winding. The connection is shown in figure 47. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 98 Z-0 earthing transformers. The fault current is then limited to typical 800 to 2000A for each transformer. The connection of Restricted earth fault protection, low impedance REFPDIF for this application is shown in figure 48. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 99 REFPDIF. The complete transformer will then be connected including HV side, neutral connection and the LV side. The connection of a REFPDIF for this application is shown in figure 49. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 100 M13048-18 v5 Reactors can be protected with Restricted earth fault protection, low impedance function REFPDIF. The connection of REFPDIF for this application is shown in figure 50. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 101: Setting Guidelines
Setting and configuration M13052-3 v2 Recommendation for analog inputs M13052-8 v4 • • Connect the neutral current here I3PW1CT1: Phase currents for winding 1 first current transformer set. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 102: Settings
IP14239-1 v3 6.3.1 Identification M14813-1 v3 IEC 61850 IEC 60617 ANSI/IEEE C37.2 Function description identification identification device number 1Ph High impedance differential HZPDIF protection SYMBOL-CC V2 EN-US Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 103: Application
IED due to its high impedance, normally in the range of hundreds of ohms and sometimes above kohm. When a fault occurs the current cannot circulate and is forced through the differential circuit causing operation. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 104 CT it is advisable to do all the CT core summations in the switchgear to have shortest possible loops. This will give lower setting values and also a better Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 105 20 V 0.100 A 0.200 A 40 V 0.100 A 0.200 A 0.400 60 V 0.100 A 0.200 A 0.400 A Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 106 The series resistor is dimensioned for 200 W. Preferable the always be lower than 200 W to allow continuous activation on during testing. If this value is exceeded, testing should be done with transient faults. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 107 Through load situation b) Through fault situation c) Internal faults IEC05000427-2-en.vsd IEC05000427 V2 EN-US Figure 53: The high impedance principle for one phase with two current transformer inputs Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 108: Connection Examples
Position of optional test switch for secondary injection into the high impedance differential IED. Necessary connection for setting resistor. Shown connections are applicable for both types of one- phase plate. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 109: Setting Guidelines
SeriesResistor : Set the value of the stabilizing series resistor. Calculate the value according to the examples for each application. Adjust the resistor as close as possible to the calculated example. Measure the value achieved and set this value here. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 111: Alarm Level Operation
However the stabilizing resistor can be selected to achieve sensitivity higher than normal load current and/or separate criteria can be added to Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 112 IEC05000749 V1 EN-US Figure 56: Current voltage characteristics for the non-linear resistors, in the range 10-200 V, the average range of current is: 0.01–10 mA Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 113: Impedance Protection
1MRK 504 124-UEN B Section 7 Impedance protection Section 7 Impedance protection Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 115: Current Protection
Only detailed network studies can determine the operating conditions under which the highest possible fault current is expected on the line. In most cases, this current appears Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 116: Meshed Network Without Parallel Line
58. In order to get the maximum through fault current, the minimum value for Z the maximum value for Z have to be considered. Fault IEC09000023-1-en.vsd IEC09000023 V1 EN-US Figure 58: Through fault current from B to A: I Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 117: Meshed Network With Parallel Line
A fault in C has to be applied, and then the maximum current seen from the IED (I ) on the healthy line (this applies for single-phase-to-earth and two-phase-to-earth faults) is calculated. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 118: Four Step Phase Overcurrent Protection Oc4Ptoc
Identification M14885-1 v3 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number Four step phase overcurrent OC4PTOC 51/67 3I> protection TOC-REVA V1 EN-US Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 120: Settings For Steps 1 To 4
Characteristn : Selection of time characteristic for step n . Definite time delay and different types of inverse time characteristics are available according to table 17. Step 2 and 3 are always definite time delayed. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 121 By setting this parameter the operation time of the step can never be shorter than the setting. Setting range: 0.000 - 60.000s in steps of 0.001s. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 123 0.7 Isc min (Equation 51) EQUATION1263 V2 EN-US where: is a safety factor and Iscmin is the smallest fault current to be detected by the overcurrent protection. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 124 The time setting is chosen to get the shortest fault time with maintained selectivity. Selectivity is assured if the time difference between the curves is larger than a critical time difference. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 125 The overcurrent protection of IED A1 must have a delayed function. The sequence of events during the fault can be described using a time axis, see figure 65. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 126 B1 is 40 ms the breaker open time is 100 ms the resetting time of protection A1 is 40 ms and the additional margin is 40 ms Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 127: Instantaneous Residual Overcurrent Protection Efpioc
For the fault at the home busbar this fault current is I . In this calculation the operational state with low source impedance Z and high source impedance Z should be used. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 128 EQUATION285 V1 EN-US In case of parallel lines with zero sequence mutual coupling a fault on the parallel line, as shown in figure 68, should be calculated. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 129: Four Step Residual Overcurrent Protection Ef4Ptoc
8.4.1 Identification M14881-1 v3 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number Four step residual overcurrent EF4PTOC 51N/67N protection TEF-REVA V1 EN-US Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 130: Application
ANSI Long Time Extremely Inverse ANSI Long Time Very Inverse ANSI Long Time Inverse IEC Normal Inverse IEC Very Inverse IEC Inverse Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 131: Setting Guidelines
These time delays can vary significantly between different protective equipment. The following time delays can be estimated: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 132: Common Settings For All Steps
. 8.4.3.2 Common settings for all steps M15282-81 v4 tx : Definite time delay for step x . Used if definite time characteristic is chosen. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 133 IPolMin : is the minimum earth-fault current accepted for directional evaluation. For smaller IBase . currents than this value the operation will be blocked. Typical setting is 5-10% of Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 135 If the protected winding will not feed earth-fault (residual) current to earth faults in the connected power system the application is as shown in figure 72. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 137 Such currents can be due to un-transposed lines. In case to protection of transformer windings not feeding residual current at external earth faults a fast lowcurrent step can be acceptable. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 138: Thermal Overload Protection, Two Time Constants Trpttr
(temperature) reaches such a level so that the transformer can be taken into service again. Therefore, the function will continue to estimate Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 139: Setting Guideline
The time constants can be changed if the current is higher than a set value or lower than a set value. If the current is high it is assumed that the forced cooling is activated while it is Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 140: Breaker Failure Protection Ccrbrf
Breaker failure protection CCRBRF 8.6.1 Identification M14878-1 v3 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number Breaker failure protection CCRBRF 50BF 3I>BF SYMBOL-U V1 EN-US Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 143: Pole Discordance Protection Ccrpld
Negative sequence currents that will give stress on rotating machines • Zero sequence currents that might give unwanted operation of sensitive earth-fault protections in the power system. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 144: Setting Guidelines
If the generator under consideration is very large and if it consumes lots of Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 145 An engine that is well run in might need no more than 5%. It is necessary to obtain information from the engine manufacturer and to measure the reverse power during commissioning. Gas turbines usually do not require reverse power protection. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 146: Directional Over-Power Protection Goppdop
Mode : The voltage and current used for the power measurement. The setting possibilities are shown in table 20. PosSeq or Arone modes are strongly recommended. For reverse power applications Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 147 The function gives trip if the power component in the direction defined by the setting Angle1(2) is larger than the set pick up power value Power1(2) Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 148 0° or 180°. 180° should be used for generator reverse power protection in 50Hz network while -179.5° should be used for generator reverse power protection in 60Hz network. This angle adjustment in 60Hz networks will improve accuracy of the power function. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 149 = 0.98 or even k = 0.99 is recommended in generator reverse power applications The value of as the trip delay is normally quite long. This filtering will improve accuracy of the power function. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 150: Directional Under-Power Protection Guppdup
EQUATION1702 V1 EN-US = × × (Equation 79) EQUATION1703 V1 EN-US = × × (Equation 80) EQUATION1704 V1 EN-US = × × (Equation 81) EQUATION1705 V1 EN-US Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 151 The setting is given in degrees. For active power the set angle should be 0° or 180°. 0° should be used for generator low forward active power protection. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 152 = 0.98 or even k = 0.99 is recommended in generator low forward power The value of applications as the trip delay is normally quite long. This filtering will improve accuracy of the power function. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 153: Negative Sequence Based Overcurrent Function Dnsptoc
• setting installed in the vicinity of this power line DirMode_OC1 to Forward • setting DirPrinc_OC1 to IcosPhi&U • setting • setting ActLowVolt1_VM to Block Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 154 IED is used between the protection function and the teleprotection communication equipment, in order to insure proper conditioning of the above two start signals. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 155: Voltage Protection
9.1.3 Setting guidelines M13851-3 v5 The parameters for Two step undervoltage protection UV2PTUV are set via the local HMI or PCM600. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 156: Equipment Protection, Such As For Motors And Generators
RMS value or phase-to-phase RMS value. Operation : Off/On . UV2PTUV measures selectively phase-to-earth voltages, or phase-to-phase voltage chosen by ConnType . the setting Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 157: Two Step Overvoltage Protection Ov2Ptov
GUID-089477DD-5BC6-4DB5-BC0A-523005A57CA0 v1 9.2.1 Identification M17002-1 v4 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number Two step overvoltage protection OV2PTOV 2U> SYMBOL-C-2U-SMALLER-THAN V1 EN-US Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 158: Application
Some applications and related setting guidelines for the voltage level are given below: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 159 UBase . The setting is highly dependent of the protection application. Here it global parameter is essential to consider the Maximum voltage at non-faulted situations. Normally this voltage is less than 110% of nominal voltage. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 160: Two Step Residual Overvoltage Protection Rov2Ptov
There is a very wide application area where general single input or residual overvoltage functions are used. All voltage related settings are made as a percentage of a settable base Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 161: Equipment Protection, Such As For Motors, Generators, Reactors And Transformers
The two healthy phases will measure full phase-to-phase voltage, as the earth is available on the faulty phase and the neutral has a full phase-to-earth voltage. The residual overvoltage will be three times the phase-to-earth voltage. See Figure Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 162: Direct Earthed System
In direct earthed systems, an earth-fault on one phase indicates a voltage collapse in that phase. The two healthy phases will have normal phase-to-earth voltages. The residual sum will have the same value as phase-to-earth voltage. See Figure Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 163: Settings For Two Step Residual Overvoltage Protection
Un> : Set operate overvoltage operation value for step n ( n =step 1 and 2), given as % of residual UBase : voltage corresponding to global set parameter > × UBase kV IECEQUATION2290 V1 EN-US Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 164: Overexcitation Protection Oexpvph
Analog measurements shall not be taken from any winding where load tap changer is located. Some different connection alternatives are shown in figure 83. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 165: Setting Guidelines
When the system voltage is high this output sends an alarm to the operator. 9.4.3.2 Settings M6496-91 v5.1.1 The parameters for Overexcitation protection OEXPVPH are set via the local HMI or PCM600. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 166: Service Value Report
Remaining time to trip (in seconds) TMTOTRIP, flux density VPERHZ, internal thermal content in percentage of trip value THERMSTA. The values are available at local HMI, Substation SAsystem and PCM600. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 167: Frequency Protection
The under frequency START value is set in Hz. All voltage magnitude related settings are made as a percentage of a global base voltage parameter. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 168: Over Frequency Protection Saptof
All the frequency and voltage magnitude conditions in the system where SAPTOF performs its functions must be considered. The same also applies to the associated equipment, its frequency and time characteristic. There are especially two application areas for SAPTOF: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 170: Setting Guidelines
3 Hz/s has been experienced when a small island was isolated from a large system. For more "normal" severe disturbances in large power systems, rate-of-change of frequency is much less, most often just a fraction of 1.0 Hz/s. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 171: Secondary System Supervision
GUID-B056E9DB-E3E5-4300-9150-45916F485CA7 V1 EN-US Figure 84: Operating principle of the trip-circuit supervision with an external resistor. The TCSSCBR blocking switch is not required since the external resistor is used. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 172 Buchholz relay is connected in parallel with the feeder terminal and other relays involved. GUID-7264738C-F9D7-48F0-B6FC-F85FD10D5B84 V1 EN-US Figure 86: Constant test current flow in parallel trip contacts and trip-circuit supervision Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 174 At lower (<48V DC) auxiliary circuit operating voltages, it is recommended to use the circuit breaker position to block unintentional operation of TCS. The use of the position indication is described earlier in this chapter. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 175: Control
Commands to an apparatus can be initiated from the Control Centre (CC), the station HMI or the local HMI on the IED front. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 176 SCSWI, SXCBR, QCBAY, SXSWI and SELGGIO are logical nodes according to IEC 61850. The signal flow between these function blocks appears in figure 88. The function Logical node Interlocking (SCILO) in the figure is the logical node for interlocking. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 177: Interaction Between Modules
12.1.3 Interaction between modules M16626-3 v4 A typical bay with apparatus control function consists of a combination of logical nodes or functions that are described here: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 178 (for example a line) to one of the possible busbars. The overview of the interaction between these functions is shown in figure below. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 179: Setting Guidelines
Bay control (QCBAY) M16670-3 v4 AllPSTOValid is set to No priority , all originators from local and remote are If the parameter accepted without any priority. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 181 I3P1 represents a three-phase group of phase current with the highest current in any of the three phases considered. As only the highest of the phase current is considered, it is Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 182 Automatic voltage control for tap changer, parallel control TR8ATCC measures the magnitude of the busbar voltage UB. If no other additional features are enabled (line voltage drop compensation), this voltage is further used for voltage regulation. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 183 The time characteristic defines the time that elapses between the moment when measured voltage exceeds the deadband interval until the appropriate URAISE or ULOWER command is initiated. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 184 ( relative voltage deviation D is equal to 1). For other values see figure 92. It should be noted that operating times, shown in the figure are for 30, 60, 90, 120, 150 & 180 seconds settings t1 and 10 seconds for tMin . Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 186 It shall be noted that the adjustment factor is negative in order to decrease the load voltage and positive in order to increase the load voltage. After this calculation U will be used set, adjust Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 187 TapPosOffs (positive or negative integer value). the master, and given by setting parameter Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 188 The tap positions will diverge and finally end up in a runaway tap situation if no measures to avoid this are taken. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 189 Thus in principal the difference between the vector diagrams in figure and figure is the sign of the setting parameter X Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 190 TR8ATCC function for each transformer in the parallel group). TR8ATCC function block can either be located in the same IED, where they are configured in PCM600 to co-operate, or in Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 191 Bmean the inner deadband at the same time as the calculated no-load voltages for all transformers in the parallel group are inside the outer deadband. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 192 If one follower in a master follower parallel group is put in manual mode, still with the setting OperationAdaptOn , the rest of the group will continue in automatic master follower control. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 193 DISC=1 in TR8ATCC data set. This data set is the same data package as the package that contains all TR8ATCC data transmitted to the other transformers in the parallel group (see section "Exchange of information between TR8ATCC functions" for more details). Figure Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 194 Activated when the transformer is set in automatic control mutualBlock Activated when the automatic control is blocked disc Activated when the transformer is disconnected from the busbar Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 195 T1RXOP = On T2RXOP = Off T3RXOP = On T4RXOP = Off TrfId =T3 T1RXOP = On T2RXOP = On T3RXOP = Off T4RXOP = Off Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 196 The outputs UBLK and TOTBLK or AUTOBLK will be activated depending on the actual parameter setting. Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 197 RESETERR on TCMYLTC function block, or alternatively by changing control mode of TR8ATCC function to Manual and then back to Automatic. Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 198 OUTOFPOS and AUTOBLK (alternatively an alarm) will be set. Setting parameters for blocking that can be set in TR8ATCC under setting group Nx in local HMI are listed in table 27. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 199 Deblocking is made via the input DEBLKAUT. Blockings activated by the operating conditions and there are no setting or separate external activation possibilities are listed in table 29. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 200 Total block via configuration • Analog input error • Automatic block via settings • Automatic block via configuration • Under-Voltage • Command error • Position indication error Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 201 The Automatic voltage control for tap changer function, TR8ATCC for parallel control will activate the output signal DAYHUNT when the number of tap changer operations exceed Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 202: Setting Guidelines
Moreover, all transformers that communicate over the same horizontal communication (GOOSE) must have unique identities. Xr2 : The reactance of the transformer in primary ohms referred to the LV side. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 203: Tr8Atcc Setting Group
Operation FSDMode : This setting enables/disables the fast step down function. Enabling can be for automatic and manual control, or for only automatic control alternatively. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 204 Rline and Xline : For line voltage drop compensation, these settings give the line resistance and Rline and Xline are given reactance from the station busbar to the load point. The settings for Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 205 Reference is made to figure for definition of forward and reverse direction of power through the transformer. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 206 If the transformers are connected to the same bus on the HV- as well as the LV-side, be calculated with the following formula which is valid for any number of two-winding Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 207 Transformer name INSTNAME : This setting can be used for indicating in tools and the local HMI to which transformer a certain instance of the function belongs. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 208: Tcmyltc General Settings
12.3.1 Identification SEMOD167845-2 v2 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number Logic rotating switch for function SLGGIO selection and LHMI presentation Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 209: Application
12.4 Selector mini switch VSGGIO 12.4.1 Identification SEMOD167850-2 v2 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number Selector mini switch VSGGIO Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 210: Application
IEC61850 generic communication I/O functions DPGGIO 12.5.1 Identification GUID-E16EA78F-6DF9-4B37-A92D-5C09827E2297 v2 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number IEC 61850 generic communication DPGGIO I/O functions Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 211: Application
Latchedx : decides if the command signal for output x is Latched (steady) or Pulsed . tPulsex : if Latchedx is set to Pulsed , then tPulsex will set the length of the pulse (in seconds). Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 212: Automation Bits Autobits
AUTOBITS function block has one setting, ( Operation : On / Off ) enabling or disabling the function. These names will be seen in the DNP communication configuration tool in PCM600. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 213: Scheme Communication
1MRK 504 124-UEN B Section 13 Scheme communication Section 13 Scheme communication Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 215: Logic
For special applications such as Lock-out refer to the separate section below. The typical connection is shown below in figure 103. Signals that are not used are dimmed. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 216: Lock-Out
Breaker failure protection CCRBRF longer 0.150s . than the back-up trip timer in CCRBRF. Normal setting is Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 217: Trip Matrix Logic Tmaggio
Inverter function block INVERTER GUID-2109B7AF-2BF1-4327-82F3-44754C066F0F v1 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number PULSETIMER function block PULSETIMER Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 218 HMI or via the PST tool. Both timers in the same logic block (the one delayed on pick-up and the one delayed on drop- out) always have a common setting value. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 219 14.4 Fixed signals FXDSIGN 14.4.1 Identification SEMOD167904-2 v2 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number Fixed signals FXDSIGN Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 220 Boolean 16 to integer conversion B16I 14.5.1 Identification SEMOD175721-2 v2 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number Boolean 16 to integer conversion B16I Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 221 Integer to boolean 16 conversion function (IB16A) is used to transform an integer into a set of 16 binary (logical) signals. It can be used – for example, to connect integer output signals from Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 222 IB16FCVB function has a logical node mapping in IEC 61850. 14.8.3 Settings ABBD8E195017 v4 The function does not have any parameters available in the local HMI or Protection and Control IED Manager (PCM600) Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 223 Inputs should be connected in ACT tool. 15.2.3 Setting guidelines GUID-DCD2D919-73C0-4A9B-9F5A-9176C189378B v1 The function does not have any parameters available in Local HMI or Protection and Control IED Manager (PCM600). Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 224 P, Q, S, I, U, f SYMBOL-RR V1 EN-US Phase current measurement CMMXU SYMBOL-SS V1 EN-US Phase-phase voltage measurement VMMXU SYMBOL-UU V1 EN-US Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 225 P, Q and S: three phase active, reactive and apparent power • PF: power factor • U: phase-to-phase voltage amplitude • I: phase current amplitude • F: power system frequency Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 226 : Low pass filter coefficient for power measurement, U and I. UAmpCompY : Amplitude compensation to calibrate voltage measurements at Y% of Ur, where Y is equal to 5, 30 or 100. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 227 XHiLim : High limit. XLowLim : Low limit. XLowLowLim : Low-low limit. XLimHyst : Hysteresis value in % of range and is common for all limits. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 228 For each of them detail explanation and final list of selected setting parameters values will be provided. The available measured values of an IED are depending on the actual hardware (TRM) and the logic configuration made in PCM600. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 229 All three phase-to-earth VT inputs are and voltage available Low pass filter coefficient for 0.00 Typically no additional filtering is required power measurement, U and I Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 230: Measurement Function Application For A Power Transformer
100% of Ir 15.4.4.2 Measurement function application for a power transformer SEMOD54481-61 v6 Single line diagram for this application is given in figure 109. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 231 Connect, in PCM600, measurement function to LV side CT & VT inputs Set the setting parameters for relevant Measurement function as shown in the following table 33: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 232: Event Counter Cntggio
ANSI/IEEE C37.2 identification identification device number Disturbance report DRPRDRE Analog input signals A1RADR Analog input signals A2RADR Analog input signals A3RADR Table continues on next page Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 233: Application
GOOSE or Report Control data. 15.6.3 Setting guidelines M12179-64 v4 The setting parameters for the Disturbance report function DRPRDRE are set via the local HMI or PCM600. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 234 Dark No power supply Yellow LED: Function controlled by SetLEDn setting in Disturbance report function. Red LED: Function controlled by SetLEDn setting in Disturbance report function. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 235 PostRetrig ) can be set to On or Off . Makes it possible to choose performance Post retrigger ( of Disturbance report function if a new trig signal appears in the post-fault window. PostRetrig = Off Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 236: Binary Input Signals
M in percent of nominal value. 15.6.3.3 Sub-function parameters M12179-389 v3 All functions are in operation as long as Disturbance report is in operation. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 237: Consideration
Remember that values of parameters set elsewhere are linked to the information on a report. Such parameters are, for example, station and object identifiers, CT and VT ratios. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 238: Measured Value Expander Block Mvexp
If the battery is subjected to a prolonged or frequent overvoltage, it leads to the ageing of the battery, which may lead to the earlier failure of the battery. The other occurrences may Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 239: Insulation Gas Monitoring Function Ssimg
Binary information based on the oil level in the circuit breaker is used as input signals to the function. In addition to that, the function generates alarms based on received information. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 240: Circuit Breaker Condition Monitoring Sscbr
The factor y depends on the type of the circuit breaker. For oil circuit breakers the factor y is normally 2. In case of a high-voltage system, the factor y can be 1.4...1.5. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 241 Calculation of Directional Coefficient The directional coefficient is calculated according to the formula: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 242 A binary input is available based on the pressure levels in the function, and alarms are generated based on these inputs. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 243: Metering
(BIO), that is, if changes of the limits are made for inputs not connected to the pulse counter, it will not influence the inputs used for pulse counting. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 244: Energy Calculation And Demand Handling Eptmmtr
50 kV and 3000 A. After that the accumulation will start on zero again. 16.2.3 Setting guidelines SEMOD175556-4 v4 The parameters are set via the local HMI or PCM600. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 245 For the advanced user there are a number of settings for direction, zero clamping, max limit, and so on. Normally, the default values are suitable for these parameters. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 247: Station Communication
IEC 61850–8–1 configuration. IEC 61850–8–1 specifies only the interface to the substation LAN. The LAN itself is left to the system integrator. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 248: Horizontal Communication Via Goose
GOOSE messages are sent in horizontal communication between the IEDs. The information, which is exchanged, is used for station wide interlocking, breaker failure protection, busbar voltage selection and so on. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 249 GOOSE receive function blocks extract process information, received by the data set, into single attribute information that can be used within the application configuration. Crosses in Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 250 If communication is invalid then data validity will also be invalid. IEC 61850 also checks for data validity using internal parameters which will also be passed to the DATAVALID output. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 251: Setting Guidelines
The master must have software that can interpret IEC 60870-5-103 communication messages. The Communication protocol manual for IEC 60870-5-103 includes the 650 series vendor specific IEC 60870-5-103 implementation. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 253: Basic Ied Functions
The list of internal events provides valuable information, which can be used during commissioning and fault tracing. The list of internal events can be found in the LHMI or viewed in PCM600 using the Event viewer tool. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 254: Time Synchronization
With time synchronization, events and disturbances within the entire station, and even between line ends, can be compared at evaluation. In the IED, the internal time can be synchronized from a number of sources: Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 255: Setting Guidelines
First, set the IED to be synchronized via IEC 60870-5-103 either from IED Configuration/Time/ Synchronization/TIMESYNCHGEN:1 in PST or from the local HMI. GUID-68284E7B-A24D-4E78-B5BA-736B29F50E9A V1 EN-US Figure 118: Settings under TIMESYNCHGEN:1 in PST Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 256: Parameter Setting Group Handling
Operational departments can plan for different operating conditions in the primary equipment. The protection engineer can prepare the necessary optimized and pre-tested settings in advance for different protection functions. Four different groups of setting Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 257: Setting Guidelines
Forcing of binary output signals is only possible when the IED is in test mode. 18.5 Change lock CHNGLCK 18.5.1 Identification GUID-6039E749-18CB-46C4-A4AD-3A8F09378522 v2 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number Change lock function CHNGLCK Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 258: Application
CHNGLCK input, that logic must be designed so that it cannot permanently issue a logical one on the CHNGLCK input. If such a situation would occur in spite of these precautions, then please contact the local ABB representative for remedial action.
Page 259: Application
ProductDef 1.1.0.A1 • Describes the release number, from the production. Example: • ProductVer • Describes the product version. Example: 1.1.0 • SerialNo • OrderingNo • ProductionDate Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 260: Primary System Values Primval
DFTRefGrpn will use DFT reference will use fixed DFT reference based on set system frequency. from the selected group block, when own group selected adaptive DFT reference will be used Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 261 SMAI_20_7:2 SMAI_20_8:2 SMAI_20_9:2 SMAI_20_10:2 SMAI_20_11:2 SMAI_20_12:2 IEC09000029_1_en.vsd IEC09000029 V1 EN-US Figure 119: SMAI instances as organized in different task time groups and the corresponding parameter numbers Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 262: Summation Block 3 Phase 3Phsum
(of the same type) for those IED functions that might need it. 18.10.3 Setting guidelines SEMOD56006-4 v5 The summation block receives the three-phase signals from SMAI blocks. The summation block has several settings. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 263: Global Base Values Gbasval
IED, typically 18.12 Authority check ATHCHCK 18.12.1 Identification GUID-FBEF319B-94E6-41FB-BB9F-D870E0425128 v2 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number Authority check ATHCHCK Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 264: Application
18.13 Authority status ATHSTAT 18.13.1 Identification GUID-79C63688-4D7D-4954-AC3C-B9484D084F6F v1 Function description IEC 61850 IEC 60617 ANSI/IEEE C37.2 identification identification device number Authority status ATHSTAT Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 265: Application
ALARM indicates that the IED limits communication 18.14.3 Setting guidelines GUID-CE3344E8-539B-47E0-9C19-8239988BDBCF v2 The function does not have any parameters available in the local HMI or PCM600. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 267: Requirements
M11610-4 v3 The requirements are a result of investigations performed in our network simulator. The current transformer models are representative for current transformers of high remanence Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 269: General Current Transformer Requirements
The characteristic of the non remanence type CT (TPZ) is not well defined as far as the phase angle error is concerned. If no explicit recommendation is given for a specific function we therefore recommend contacting ABB to confirm that the non remanence type can be used.
Page 271: Breaker Failure Protection
The burden of an IED current input channel (VA). S =0.010 VA/channel for I =1 A and S =0.250 VA/ channel for I =5 A Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 272: Non-Directional Inverse Time Delayed Phase And Residual Overcurrent
If the directional overcurrent function is used the CTs must have a rated equivalent secondary e.m.f. E that is larger than or equal to the required equivalent secondary e.m.f. E below: alreq Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 273: Current Transformer Requirements For Cts According To Other Standards
80 % of the E . Therefore, the CTs according to class PX, X and TPS must have a rated knee-point e.m.f. E that fulfills the following: knee Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 274: Current Transformers According To Ansi/Ieee
The transient responses for three different standard transient response classes, T1, T2 and T3 are specified in chapter 15.5 of the standard. CVTs according to all classes can be used. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 275: Sntp Server Requirements
1MRK 504 124-UEN B Section 19 Requirements The protection IED has effective filters for these transients, which gives secure and correct operation with CVTs. 19.3 SNTP server requirements Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 277: Glossary
Central processor unit Carrier receive Cyclic redundancy check CROB Control relay output block Carrier send Current transformer Capacitive voltage transformer Delayed autoreclosing Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 278 GOOSE Generic object-oriented substation event Global positioning system HDLC protocol High-level data link control, protocol based on the HDLC standard HFBR connector type Plastic fiber connector Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 279 Local detection device Light-emitting diode Miniature circuit breaker Mezzanine carrier module Multifunction vehicle bus. Standardized serial bus originally developed for use in trains. National Control Centre Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 280 Supervision, control and data acquisition System configuration tool according to standard IEC 61850 Service data unit SMA connector Subminiature version A, A threaded connector with constant impedance. Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 281 "Z", which stands for longitude zero. Undervoltage Weak end infeed logic Voltage transformer X.21 A digital signalling interface primarily used for telecom equipment Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 282 Three times zero-sequence current. Often referred to as the residual or the earth-fault current Three times the zero sequence voltage. Often referred to as the residual voltage or the neutral point voltage Transformer protection RET650 Application manual © Copyright 2011 ABB Power Grids. All rights reserved...
Page 284 ABB Power Grids Sweden AB Grid Automation Products SE-721 59 Västerås, Sweden Phone +46 (0) 10 738 00 00 Scan this QR code to visit our website https://www.abb.com/protection-control © Copyright 2011 ABB Power Grids. All rights reserved.

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