busbar diffrential protection reb611

8/12/2019 Busbar Diffrential Protection REB611

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Document ID: 1MRS757455

Issued: 2011-11-18

Revision: A

Product version: 1.0

Copyright 2011 ABB. All rights reserved


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CopyrightThis document and parts thereof must not be reproduced or copied without written

permission from ABB, and the contents thereof must not be imparted to a thirdparty, nor used for any unauthorized purpose.

The software or hardware described in this document is furnished under a license

and may be used, copied, or disclosed only in accordance with the terms of such

license.

TrademarksABB and Relion are registered trademarks of the ABB Group. All other brand or

product names mentioned in this document may be trademarks or registered

trademarks of their respective holders.

WarrantyPlease inquire about the terms of warranty from your nearest ABB representative.

http://www.abb.com/substationautomation
http://http//WWW.ABB.COM/SUBSTATIONAUTOMATION


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DisclaimerThe data, examples and diagrams in this manual are included solely for the concept

or product description and are not to be deemed as a statement of guaranteedproperties. All persons responsible for applying the equipment addressed in this

manual must satisfy themselves that each intended application is suitable and

acceptable, including that any applicable safety or other operational requirements

are complied with. In particular, any risks in applications where a system failure and/

or product failure would create a risk for harm to property or persons (including but

not limited to personal injuries or death) shall be the sole responsibility of the

person or entity applying the equipment, and those so responsible are hereby

requested to ensure that all measures are taken to exclude or mitigate such risks.

This document has been carefully checked by ABB but deviations cannot be

completely ruled out. In case any errors are detected, the reader is kindly requested

to notify the manufacturer. Other than under explicit contractual commitments, in

no event shall ABB be responsible or liable for any loss or damage resulting from

the use of this manual or the application of the equipment.


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ConformityThis product complies with the directive of the Council of the European

Communities on the approximation of the laws of the Member States relating toelectromagnetic compatibility (EMC Directive 2004/108/EC) and concerning

electrical equipment for use within specified voltage limits (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. The product is designed in accordance with the international

standards of the IEC 60255 series.


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Table of contentsSection 1 Introduction.......................................................................3

This manual........................................................................................3

Intended audience..............................................................................3

Product documentation.......................................................................4

Product documentation set............................................................4

Document revision history.............................................................5

Related documentation..................................................................6

Symbols andconventions...................................................................6

Symbols.........................................................................................6

Document conventions..................................................................6

Functions, codes and symbols......................................................7

Section 2 REB611 overview.............................................................9Overview.............................................................................................9

Product version history..................................................................9

PCM600 and IED connectivity package version............................9

Operation functionality......................................................................10

Optional functions........................................................................10

Physical hardware............................................................................10

Local HMI.........................................................................................11Display.........................................................................................12

LEDs............................................................................................12

Keypad........................................................................................13

Web HMI...........................................................................................13

Authorization.....................................................................................14

Communication.................................................................................15

Section 3 REB611 standard configuration ....................................17Standard configuration.....................................................................17

Switch groups...................................................................................18Input switch group ISWGAPC.....................................................18

Output switch group OSWGAPC.................................................19

Selector switch group SELGAPC................................................19

Connection diagrams........................................................................21

Presentationof standard configuration.............................................23

Standard configuration A..................................................................24

Applications.................................................................................24

Functions.....................................................................................25

Default I/O connections..........................................................26

Predefined disturbance recorder connections........................26

Table of contents

REB611 1Application Manual


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Functional diagrams....................................................................27

Functional diagrams for protection.........................................27

Functional diagrams for disturbance recorder........................30

Functional diagrams for control and interlocking....................32Switch groups..............................................................................34

Binary inputs...........................................................................34

Internal signal.........................................................................35

Binary outputs and LEDs........................................................36

GOOSE..................................................................................47

Section 4 Requirements for measurement transformers................51Current transformers........................................................................51

Current transformer requirements for differential

protection ....................................................................................51

Section 5 IED physical connections...............................................57Inputs................................................................................................57

Energizing inputs.........................................................................57

Differential currents................................................................57

Residual current.....................................................................57

Auxiliary supply voltage input......................................................57

Binary inputs................................................................................58

Outputs.............................................................................................58

Outputs for tripping and controlling..............................................58

Outputs for signalling...................................................................59

IRF...............................................................................................59

Section 6 Glossary.........................................................................61

Table of contents

2 REB611Application Manual


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Section 1 Introduction

1.1 This manualThe application manual contains application descriptions and setting guidelines

sorted per function. The manual can be used to find out when and for what purpose

a typical protection function can be used. The manual can also be used when

calculating settings.

1.2 Intended audienceThis manual addresses the protection and control engineer responsible for

planning, pre-engineering and engineering.

The protection and control engineer must be experienced in electrical power

engineering and have knowledge of related technology, such as communication

and protocols.

1MRS757455 A Section 1Introduction



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1.3 Product documentation1.3.1 Product documentation set

Planning&purchase

Engineering

Installing

Commissioning

Operation

Maintenance

Decommissioning

deinstalling&disposal

Application manual

Operation manual

Installation manual

Service manual

Engineering manual

Commissioning manual

Communication protocolmanual

Technical manual

Planning&purchase

Engineering

Installing

Commissioning

Operation

Maintenance

Decommissioning


Planning&purchase

Engineering

Installing

Commissioning

Operation

Maintenance

Decommissioning


Application manualApplication manual

Operation manualOperation manual

Installation manualInstallation manual

Service manualService manual

Engineering manualEngineering manual

Commissioning manualCommissioning manual

Communication protocolmanualCommunication protocolmanual

Technical manualTechnical manual

en07000220.vsd

IEC07000220 V1 EN

Figure 1: The intended use of manuals in different lifecycles

The engineering manual contains instructions on how to engineer the IEDs using

the different tools in PCM600. The manual provides instructions on how to set up a

PCM600 project and insert IEDs to the project structure. The manual also

recommends a sequence for engineering of protection and control functions, LHMI

functions as well as communication engineering for IEC 61850 and othersupported protocols.

The installation manual contains instructions on how to install the IED. The

manual provides procedures for mechanical and electrical installation. The chapters

are organized in chronological order in which the IED should be installed.

The commissioning manual contains instructions on how to commission the IED.

The manual can also be used by system engineers and maintenance personnel for

assistance during the testing phase. The manual provides procedures for checking

of external circuitry and energizing the IED, parameter setting and configuration as

Section 1 1MRS757455 AIntroduction



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well as verifying settings by secondary injection. The manual describes the process

of testing an IED in a substation which is not in service. The chapters are organized

in chronological order in which the IED should be commissioned.

The operation manual contains instructions on how to operate the IED once it hasbeen commissioned. The manual provides instructions for monitoring, controlling

and setting the IED. The manual also describes how to identify disturbances and

how to view calculated and measured power grid data to determine the cause of a

fault.

The service manual contains instructions on how to service and maintain the IED.

The manual also provides procedures for de-energizing, de-commissioning and

disposal of the IED.

The application manual contains application descriptions and setting guidelines

sorted per function. The manual can be used to find out when and for what purpose

a typical protection function can be used. The manual can also be used when

calculating settings.

The technical manual contains application and functionality descriptions and lists

function blocks, logic diagrams, input and output signals, setting parameters and

technical data sorted per function. The manual can be used as a technical reference

during the engineering phase, installation and commissioning phase, and during

normal service.

The communication protocol manual describes a communication protocol

supported by the IED. The manual concentrates on vendor-specific implementations.

The point list manual describes the outlook and properties of the data points

specific to the IED. The manual should be used in conjunction with the

corresponding communication protocol manual.

Some of the manuals are not available yet.

1.3.2 Document revision historyDocument revision/date Product series version HistoryA/2011-11-18 1.0 First release

Download the latest documents from the ABB Web site

http://www.abb.com/substationautomation.


http://http//WWW.ABB.COM/SUBSTATIONAUTOMATION


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1.3.3 Related documentationName of the document Document IDModbus Communication Protocol Manual 1MRS757461

IEC 61850 Engineering Guide 1MRS757465

Installation Manual 1MRS757452

Operation Manual 1MRS757453

Technical Manual 1MRS757454

1.4 Symbols and conventions

1.4.1 SymbolsThe electrical warning icon indicates the presence of a hazard

which could result in electrical shock.

The warning icon indicates the presence of a hazard which could

result in personal injury.

The caution icon indicates important information or warning relatedto the concept discussed in the text. It might indicate the presence

of a hazard which could result in corruption of software or damage

to equipment or property.

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.

Although warning hazards are related to personal injury, it is necessary to

understand that under certain operational conditions, operation of damaged

equipment may result in degraded process performance leading to personal injury

or death. Therefore, comply fully with all warning and caution notices.

1.4.2 Document conventionsA particular convention may not be used in this manual.




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Abbreviations and acronyms in this manual are spelled out in the glossary. The

glossary also contains definitions of important terms.

Push-button navigation in the LHMI menu structure is presented by using the

push-button icons.

To navigate between the options, use and .

HMI menu paths are presented in bold.

Select Main menu/Settings.

LHMI messages are shown in Courier font.

To save the changes in non-volatile memory, select Yesand press .

Parameter names are shown in italics.

The function can be enabled and disabled with the Operationsetting.

Parameter values are indicated with quotation marks.

The corresponding parameter values are "On" and "Off".

IED input/output messages and monitored data names are shown in Courier font.

When the function starts, the STARToutput is set to TRUE.

1.4.3 Functions codes and symbolsTable 1: REB611 functions codes and symbolsFunction IEC 61850 IEC 60617 IEC-ANSIProtectionHigh-impedance differential

protection, instance 1HIPDIF1 dHi>(1) 87(1)

High-impedance differential


High-impedance differential


Non-directional earth-fault protection,

low stage, instance 1EFLPTOC1 Io> (1) 51N-1 (1)

Non-directional earth-fault protection,

high stage, instance 1EFHPTOC1 Io>> (1) 51N-2 (1)

Circuit breaker failure protection CCBRBRF1 3I>/Io>BF 51BF/51NBF

Master trip, instance 1 TRPPTRC1 Master Trip (1) 94/86 (1)


Switch groupsInput switch group 1) ISWGAPC ISWGAPC ISWGAPC

Output switch group 2) OSWGAPC OSWGAPC OSWGAPC

Selector switch group 3) SELGAPC SELGAPC SELGAPC

Configurable timersMinimum pulse timer (2 pcs) 4) TPGAPC TP TP

ControlCircuit-breaker control CBXCBR1 I O CB I O CB

SupervisionTrip circuit supervision, instance 1 TCSSCBR1 TCS (1) TCM (1)

Table continues on next page




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Function IEC 61850 IEC 60617 IEC-ANSITrip circuit supervision, instance 2 TCSSCBR2 TCS (2) TCM (2)

CT supervision for high-impedance

protection scheme, instance 1HZCCRDIF1 MCS 1I(1) MCS 1I(1)





MeasurementDisturbance recorder RDRE1 - -

Three-phase current measurement,

instance 1 5)CMMXU1 3I 3I

Residual current measurement,

instance 1RESCMMXU1 Io In

1) 10 instances

2) 20 instances3) 6 instances

4) 10 instances

5) In REB611, CMMXU is used for measuring differential phase currents.




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Section 2 REB611 overview

2.1 OverviewREB611 is a dedicated busbar protection IED (intelligent electronic device)

designed for phase-segregated short-circuit protection, control, and supervision of

single busbars. REB611 is intended for use in high-impedance-based applications

within utility substations and industrial power systems. In addition, the IED can be

utilized in restricted earth-fault and residual earth-fault applications for the

protection of generators, motors, transformers and reactors.

REB611 is a member of ABBs Relionproduct family and part of the 611

protection and control product series. The 611 series IEDs are characterized by

their compactness and withdrawable-unit design.

The 611 series is designed to offer simplified but powerful functionality intended

for most applications. Once the application-specific parameters have been entered,

the installed IED is ready to be put into service. The further addition of

communication functionality and interoperability between substation automation

devices offered by the IEC 61850 standard adds flexibility and value to end users

as well as electrical system manufacturers.

2.1.1 Product version historyProduct version Product history1.0 Product released

2.1.2 PCM600 and IED connectivity package version Protection and Control IED Manager PCM600 Ver. 2.4 or later

REB611 Connectivity Package Ver. 1.0 or later

Parameter Setting

Firmware Update

Disturbance Handling

Signal Monitoring

Lifecycle Traceability

Signal Matrix

Communication Management

IED Configuration Migration

Configuration Wizard

1MRS757455 A Section 2REB611 overview



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Label Printing

IED User Management

Differential Characteristics Tool

Download connectivity packages from the ABB web site http://

www.abb.com/substationautomation

2.2 Operation functionality2.2.1 Optional functions

Modbus TCP/IP or RTU/ASCII

2.3 Physical hardwareThe IED consists of two main parts: plug-in unit and case. The content depends on

the ordered functionality.

Table 2: Plug-in unit and caseMain unit Slot ID Content optionsPlug-in

unit

- HMI Small (4 lines, 16 characters)

X100 Auxiliary power/

BO module

48-250 V DC/100-240 V AC; or 24-60 V DC

2 normally-open PO contacts

1 change-over SO contacts

1 normally-open SO contact

2 double-pole PO contacts with TCS

1 dedicated internal fault output contact

X120 AI/BI module Configuration A:

3 differential phase current inputs (1/5 A)

1 residual current input (1/5 A or 0.2/1 A)1)

4 binary inputs

Case X000 Optional

communicationmodule

See technical manual for details about different type of

communication modules.

1) The 0.2/1 A input is normally used in applications requiring sensitive earth-fault protection and

featuring core-balance current transformers.

Rated values of the current and voltage inputs are basic setting parameters of the

IED. The binary input thresholds are selectable within the range 18176 V DC by

adjusting the binary input setting parameters.

The connection diagrams of different hardware modules are presented in this manual.

Section 2 1MRS757455 AREB611 overview

http://http//WWW.ABB.COM/SUBSTATIONAUTOMATIONhttp://http//WWW.ABB.COM/SUBSTATIONAUTOMATION


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See the installation manual for more information about the case and

the plug-in unit.

T ab le 3: N um be r of p hysica l co nne ction s in sta nda rd co nfig ura tio nConf. Analog channels Binary channels CT VT BI BOA 4 - 4 6

2.4 Local HMI

REF611

Overcurrent

Earth-fault

Phase unbalance

Thermal overload

AR sequence in progress

Disturb.rec.trigged

Trip circuit failure

Breaker failure

GUID-E15422BF-B3E6-4D02-8D43-D912D5EF0360 V1 EN

Figure 2: Example of 611 series LHMI

The LHMI of the IED contains several elements.




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Display

Buttons

LED indicators

Communication port

The LHMI is used for setting, monitoring and controlling.

2.4.1 DisplayThe LHMI includes a graphical display that supports two character sizes. The

character size depends on the selected language. The amount of characters and

rows fitting the view depends on the character size.

Table 4: Characters and rows on the viewCharacter size Rows in view Characters on rowSmall, mono-spaced (6x12 pixels) 5 rows 20

Large, variable width (13x14 pixels) 4 rows min 8

The display view is divided into four basic areas.

1

3 4

2

GUID-24ADB995-439A-4563-AACE-1FAA193A8EF9 V1 EN

Figure 3: Display layout

1 Header

2 Icon

3 Content

4 Scroll bar (displayed when needed)

2.4.2 LEDsThe LHMI includes three protection indicators above the display: Ready, Start and

Trip.




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There are also 8 programmable LEDs on front of the LHMI. The LEDs can be

configured with the LHMI, WHMI or PCM600.

2.4.3 KeypadThe LHMI keypad contains push-buttons which are used to navigate in different

views or menus. With the push-buttons you can give open or close commands to

one object in the primary circuit, for example, a circuit breaker, a contactor or a

disconnector. The push-buttons are also used to acknowledge alarms, reset

indications, provide help and switch between local and remote control mode.

GUID-B681763E-EC56-4515-AC57-1FD5349715F7 V1 EN

Figure 4: LHMI keypad with object control, navigation and command push-

buttons and RJ-45 communication port

2.5 Web HMIThe WHMI enables the user to access the IED via a web browser. The supported

web browser version is Internet Explorer 7.0 or 8.0.

WHMI is disabled by default.

WHMI offers several functions.

Programmable LEDs and event lists

System supervision

Parameter settings

Measurement display

Disturbance records

Phasor diagram

Signal configuration

The menu tree structure on the WHMI is almost identical to the one on the LHMI.




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GUID-CD531B61-6866-44E9-B0C1-925B48140F3F V1 EN

Figure 5: Example view of the WHMI

The WHMI can be accessed locally and remotely.

Locally by connecting your laptop to the IED via the front communication port.

Remotely over LAN/WAN.

2.6 AuthorizationThe user categories have been predefined for the LHMI and the WHMI, each with

different rights and default passwords.

The default passwords can be changed with Administrator user rights.

User authorization is disabled by default but WHMI always usesauthorization.




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Table 5: Predefined user categoriesUsername User rightsVIEWER Read only access

OPERATOR Selecting remote or local state with (only locally) Changing setting groups

Controlling

Clearing indications

ENGINEER Changing settings

Clearing event list

Clearing disturbance records

Changing system settings such as IP address, serial baud rate

or disturbance recorder settings

Setting the IED to test mode

Selecting language

ADMINISTRATOR All listed above

Changing password Factory default activation

For user authorization for PCM600, see PCM600 documentation.

2.7 CommunicationFor application specific situations where communication between IEDs and remote

systems are needed, the 611 series IEDs also support IEC 61850 and Modbus

communication protocols. Operational information and controls are available

through these protocols. Some communication functionality, for example,

horizontal communication between the IEDs, is only enabled by the IEC 61850

communication protocol.

The IEC 61850 communication implementation supports monitoring and control

functionality. Additionally, parameter settings and disturbance and fault records

can be accessed using the IEC 61850 protocol. Disturbance records are available to

any Ethernet-based application in the standard COMTRADE file format. The IEDcan send and receive binary signals from other IEDs (so called horizontal

communication) using the IEC 61850-8-1 GOOSE profile, where the highest

performance class with a total transmission time of 3 ms is supported. The IED

meets the GOOSE performance requirements for tripping applications in

distribution substations, as defined by the IEC 61850 standard. The IED can

simultaneously report events to five different clients on the station bus.

The IED can support five simultaneous clients. If PCM600 reserves one client

connection, only four client connections are left, for example, for IEC 61850 and

Modbus.




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All communication connectors, except for the front port connector, are placed on

integrated optional communication modules. The IED can be connected to Ethernet-

based communication systems via the RJ-45 connector (100Base-TX) or the fibre-

optic LC connector (100Base-FX). An optional serial interface is available for

RS-485 communication.

Managed Ethernet switch

with RSTP support

Managed Ethernet switch

with RSTP support

Network

Network

REF611

Overcurrent

Earth-fault

Phaseunbalance

Thermaloverload

ARsequenceinprogress

Disturb.rec. trigged

Tripcircuit failure

Breakerfailure

REF611

Overcurrent

Earth-fault

Phaseunbalance

Thermaloverload



Tripcircuitfailure

Breakerfailure

REF611

Overcurrent

Earth-fault

Phaseunbalance

Thermaloverload



Tripcircuit failure

Breakerfailure

REM611

Short circuit

Combinedprotec tion

Thermaloverload

Motorrestartinhibit

Emergencys tart enabled

Disturb.rec.trigged

Supervisionalarm

Breakerfailure

REB611

High-impedance1operate



High-impedancestart

Segregatedsupervision

Disturb.rec.trigged

Tripcircuit failure

Breakerfailure

REF611 REF611 REF611 REM611 REB611

Client BClient A

GUID-A19C6CFB-EEFD-4FB2-9671-E4C4137550A1 V1 EN

Figure 6: Self-healing Ethernet ring solution

The Ethernet ring solution supports the connection of up to thirty

611 series IEDs. If more than 30 IEDs are to be connected, it is

recommended that the network is split into several rings with no

more than 30 IEDs per ring.




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Section 3 REB611 standard configuration

3.1 Standard configurationREB611 is available in one standard configuration.

To increase the user-friendliness of the IEDs standard configuration and to

emphasize the IED's simplicity of usage, only the application-specific parameters

need setting within the IED's intended area of application.

The standard signal configuration can be altered by LHMI (human-machineinterface), WHMI (Web browser-based user interface) or the optional application

functionality of the Protection and Control IED Manager PCM600.

Table 6: Standard configurationDescription Std. conf.High-impedance differential A

Table 7: Supported functionsFunctionality Conf. AProtection1)High-impedance differential protection, instance 1

High-impedance differential protection, instance 2

High-impedance differential protection, instance 3

Non-directional earth-fault protection, low stage, instance 1 2)

Non-directional earth-fault protection, high stage, instance 1 2)

Circuit breaker failure protection

Master trip, instance 1

Master trip, instance 2

Switch groupsInput switch group

Output switch group

Selector switch group

Configurable timerMinimum pulse timer (2 pcs)

ControlCircuit-breaker control

SupervisionTable continues on next page

1MRS757455 A Section 3REB611 standard configuration



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Functionality Conf. ATrip circuit supervision, instance 1

Trip circuit supervision, instance 2

CT supervision for high-impedance protection scheme, instance 1



MeasurementDisturbance recorder

Three-phase current measurement, instance 1 3)

Residual current measurement, instance 1

= Included

1) The instances of a protection function represent the number of identical function blocks available in

a standard configuration.

2) Io selectable by parameter, Io measured as default.


3.2 Switch groupsThe default application configurations cover the most common application cases,

however, changes can be made according to specific needs through LHMI, WHMI

and PCM600.

Programming is easily implemented with three switch group functions including

input switch group (ISWGAPC), output switch group (OSWGAPC) and selectorswitch group (SELGAPC). Each switch group has several instances.

Connections of binary inputs to functions, GOOSE signals to functions, functions

to functions, functions to binary outputs and functions to LEDs have been

preconnected through corresponding switch groups.

Change the parameter values of the switch groups to modify the real connection

logic and the application configuration.

3.2.1 Input switch group ISWGAPCThe input switch group ISWGAPC has one input and a number of outputs. Every

input and output has a read-only description. ISWGAPC is used for connecting the

input signal to one or several outputs of the switch group. Each output can be set to

be connected or not connected with the input separately via the OUT_x

connection setting.

Section 3 1MRS757455 AREB611 standard configuration



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GUID-2D549B56-6CF7-4DCB-ACDE-E9EF601868A8 V1 EN

Figure 7: Input switch group ISWGAPC

3.2.2 Output switch group OSWGAPCThe output switch group OSWGAPC has a number of inputs and one output. Every

input and output has a read-only description. OSWGAPC is used for connecting

one or several inputs to the output of the switch group via OR logic. Each input can

be set to be connected or not connected with the OR logic via the IN_x

connection settings. The output of OR logic is routed to switch group output.

GUID-1EFA82D5-F9E7-4322-87C2-CDADD29823BD V1 EN

Figure 8: Output switch group OSWGAPC

3.2.3 Selector switch group SELGAPCThe selector switch group SELGAPC has a number of inputs and outputs. Every

input and output has a read-only description. Each output can be set to beconnected with one the of inputs via the OUT_x connection setting. An output

can also be set to be not connected with any of the inputs. In SELGAPC, one

output signal can only be connected to one input signal but the same input signal

can be routed to several output signals.




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GUID-E3AEC7AB-2978-402D-8A80-C5DE9FED67DF V1 EN

Figure 9: Selector switch group SELGAPC




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3.3 Connection diagrams

L1

L2L3

REB611

16

17

1918

X100

6

7

89

10

111213

15

14

2

1

3

4

5

22

2123

24

SO2

TCS2

PO4

SO1

TCS1

PO3

PO2

PO1

IRF

+

-

Uaux

20

1) The IED f eatures an automatic short-circuit

mechanism in the CT connector when plug-in

unit is detached

1)

X120

1

2

3

4

5

6

7

89

1011

12

14Io

IL1

IL2

BI 4

BI 3

BI 2

BI 1

IL3

1/5A

N

1/5A

N

1/5A

N

1/5A

N

13

L1

L2L3

N

Ru Ru Ru Rs Rs Rs

GUID-72C26156-5904-4F37-B2CB-B2AD5F710BAC V1 EN

Figure 10: Connection diagram for configuration A when used as busbar

differential protection




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L1

L2L3

REB611

16

17

1918

X100

67

8910

111213

15

14

2

1

3

4

5

22

2123

24

SO2

TCS2

PO4

SO1

TCS1

PO3

PO2

PO1

IRF

+

-

Uaux

20

1) The IED features an automatic short-circuit

mecha nism in the CT connector when plug-in unit is detached

1)

X120

1

2

3

4

5

6

7

89

1011

12

14Io

IL1

IL2

BI 4

BI 3

BI 2

BI 1

IL3

1/5A

N

1/5A

N

1/5A

N

1/5A

N

13

3~

Ru RsRu Ru Rs

G

Rs

GUID-000FA2D5-6D6C-4A66-9772-7741A0BA3E91 V1 EN

Figure 11: Connection diagram for configuration A when used as rotating

machine phase differential protection




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L1L2L3

REB611

16

17

1918

X100

67

8910

1112

13

15

14

2

1

3

4

5

22

2123

24

SO2

TCS2

PO4

SO1

TCS1

PO3

PO2

PO1

IRF

+

-

Uaux

20

1) The IED f eatures an automatic short-circuit

mechan ism in the CT connector when plug-in

unit is detached

1)

X120

1

2

3

4

5

6

7

89

1011

12

14

Io

IL1

IL2

BI 4

BI 3

BI 2

BI 1

IL3

1/5A

N

1/5A

N

1/5A

N

1/5A

N

13

3~

G

Ru Rs

GUID-00968A99-E6A2-4649-A50F-28E52CB8F484 V1 EN

Figure 12: Connection diagram for configuration A when used as rotating

machine restricted earth-fault protection

3.4 Presentation of standard configurationFunctional diagramsThe functional diagrams describe the IED's functionality from the protection,

measuring, condition supervision, disturbance recording, control and interlockingperspective. Diagrams show the default functionality with simple symbol logics

forming principle diagrams.

The functional diagrams are divided into sections with each section constituting

one functional entity.

Protection function blocks are part of the functional diagram. They are identified

based on their IEC 61850 name but the IEC based symbol and the ANSI function

number are also included. Some function blocks, such as HIPDIF, are used several

times in the configuration. To separate the blocks from each other, the IEC 61850

name, IEC symbol and ANSI function number are appended with a running




30/72

number, that is an instance number, from one upwards. If the block has no suffix

after the IEC or ANSI symbol, the function block has been used, that is,

instantiated, only once.

Switch groupsSwitch group information can be divided into three levels.

The first level is a configuration overview. All switch groups in the

configuration are presented in an overview figure. The figure provides general

information about the relationship between different switch groups.

The second level presents function group information. It explains how the

switch groups belong to a special function as well as related function blocks.

The third level presents detailed information about the switch groups. It

provides information about a specific switch group including the logic

connection of the input and output, default connection and port description.

Conventions used in switch group figures:

The text in the symbol indicates the logic connections of the function's

inputs or outputs. The text is a combination of a function block name and the

input or output name. They are connected with a _ symbol.

If there are many lines of text in an output symbol , each line indicates a

signal. The switch group output is routed to all these signals.

If there are many lines of text in an input symbol , each line indicates a

signal. All signals are routed to a switch group input via an OR logic.

The text above the connection line is the description of the port.

If there is no text in the connection line, the port description is the same as thetext in the symbol.

A dashed arrow within the switch group function box indicate the default

connection of the switch group.

3.5 Standard configuration A3.5.1 Applications

The standard configuration for phase-segregated high-impedance differential

protection and non-directional earth-fault protection is mainly intended for use in

high-impedance-based applications within utility substations and industrial power

systems. In addition, the IED can also be used in restricted earth-fault and residual

earth-fault applications for the protection of generators, motors, transformers and

reactors.

The IED with a standard configuration is delivered from the factory with default

settings and parameters. The end-user flexibility for incoming, outgoing and

internal signal designation within the IED enables this configuration to be further




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adapted to different primary circuit layouts and the related functionality needs by

modifying the internal functionality using PCM600.

3.5.2 FunctionsTable 8: Functions included in the standard configuration AFunction IEC 61850 IEC 60617 IEC-ANSIProtectionHigh-impedance differential protection,

instance 1HIPDIF1 dHi>(1) 87(1)

High-impedance differential protection,


High-impedance differential protection,


Non-directional earth-fault protection, lowstage, instance 1 EFLPTOC1 Io> (1) 51N-1 (1)

Non-directional earth-fault protection, high

stage, instance 1EFHPTOC1 Io>> (1) 51N-2 (1)

Circuit breaker failure protection CCBRBRF1 3I>/Io>BF 51BF/51NBF



Switch groupsInput switch group ISWGAPC ISWGAPC ISWGAPC

Output switch group OSWGAPC OSWGAPC OSWGAPC

Selector switch group SELGAPC SELGAPC SELGAPC

Configurable timerMinimum pulse timer (2 pcs) TPGAPC TP TP

ControlCircuit-breaker control CBXCBR1 I O CB I O CB

SupervisionTrip circuit supervision, instance 1 TCSSCBR1 TCS (1) TCM (1)

Trip circuit supervision, instance 2 TCSSCBR2 TCS (2) TCM (2)




protection scheme, instance 2 HZCCRDIF2 MCS 1I(2) MCS 1I(2)



MeasurementDisturbance recorder RDRE1 - -

Three-phase current measurement,

instance 11)CMMXU1 3I 3I

Residual current measurement, instance 1 RESCMMXU1 Io In





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3.5.2.1 Default I/O connectionsTable 9: Default connections for binary inputsBinary input Default usage Connector pinsX120-BI1 - X120-1,2

X120-BI2 Circuit breaker closed position indication X120-3,2

X120-BI3 Circuit breaker open position indication X120-4,2

X120-BI4 - X120-5,6

Table 10: D efault connections for binary outputsBinary input Default usage Connector pinsX100-PO1 Close circuit breaker X100-6,7

X100-PO2 Circuit breaker failure protection trip to upstream

breaker

X100-8,9

X100-PO3 Open circuit breaker/trip coil 1 X100-15,16,17,18,19

X100-PO4 Open circuit breaker/trip coil 2 X100-20,21,22,23,24

X100-SO1 General start indication X100-10,11,12

X100-SO2 General operate indication X100-13,14,15

Table 11: Default connections for LEDsLED Default usage1 High-impedance differential protection stage 1 operate

2 High-impedance differential protection stage 2 operate

3 High-impedance differential protection stage 3 operate

4 High-impedance differential protection start

5 Dedicated phase-segregated supervision function alarm

6 Disturbance recorder triggered

7 Trip circuit supervision alarm

8 Circuit-breaker failure operate

3.5.2.2 Predefined disturbance recorder connectionsTable 12: Predefined analog channel setupChannel Selection and text1 IL1

2 IL2

3 IL3

4 Io




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Additionally, all the digital inputs that are connected by default are also enabled

with the setting. Default triggering settings are selected depending on the

connected input signal type. Typically all protection START signals are selected to

trigger the disturbance recorded by default.

3.5.3 Functional diagramsThe functional diagrams describe the default input, output, programmable LED,

switch group and function-to-function connections. The default connections can be

viewed and changed with switch groups in PCM600, LHMI and WHMI according

to the application requirements.

The analog channels have fixed connections towards the different function blocks

inside the IEDs standard configuration. Exceptions from this rule are the four

analog channels available for the disturbance recorder function. These channels are

freely selectable and a part of the disturbance recorders parameter settings.

3.5.3.1 Functional diagrams for protectionThe functional diagrams describe the IEDs protection functionality in detail and

picture the factory default connections.

LED 4

HIGH-IMPEDANCE DIFFERENTIAL PROTECTION

HIPDIF1

dHi>(1)

87(1)

BLOCK

OPERATEI_A

START

HIPDIF2dHi>(2)

87(2)

BLOCK

OPERATEI_B

START

HIPDIF3dHi>(3)

87(3)

BLOCK

OPERATEI_C

START

OSWGAPC4

OR OUT

IN_1

IN_2

IN_3

SELGAPC4

OUT_4IN_6

LED 1

LED 2

LED 3

OSWGAPC10

OUTIN_3

OSWGAPC9

OUTIN_2

OSWGAPC8

OUTIN_1

SELGAPC4

OUT_3IN_12

SELGAPC4

OUT_2IN_11

SELGAPC4

OUT_1IN_10

HZCCRDIF1_ALARM

HZCCRDIF2_ALARM

HZCCRDIF3_ALARM

GUID-4D5EE676-4AC1-4E46-B4C8-641B149B3C83 V1 EN

Figure 13: High-impedance differential protection




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Three high-impedance differential protection instances are offered. By default,

HIPDIF1 is for phase A current channel, HIPDIF2 is for phase B current channel,

and HIPDIF3 is for phase C current channel. The ALARM outputs of the phase-

segregated current transformer supervision (HZCCRDIF) block HIPDIF.

HIPDIF1 operate signal is connected to LED 1, HIPDIF2 operate signal is

connected to LED 2, HIPDIF3 operate signal is connected to LED 3. All the start

signals from HIPDIF1...HIPDIF3 are connected to LED 4.

HZCCRDIF3MCS 1I(3)

MCS 1I(3)

BLOCK

ALARMI_C

HZCCRDIF2

MCS 1I(2)

MCS 1I(2)

BLOCK

ALARMI_B

HZCCRDIF1

MCS 1I(1)

MCS 1I(1)

BLOCK

ALARMI_A

LED 5

SELGAPC4

OUT_5IN_13

OSWGAPC11

OR OUT

IN_1

IN_2

IN_3

PHASE SEGREGATED CT SUPERVISION

GUID-2777A166-E375-4BC4-90D7-87A80E477393 V1 EN

Figure 14: Phase segregated CT supervision

Three phase-segregated current transformer supervision instances are offered. By

default, HZCCRDIF1 is for phase A current channel, HZCCRDIF 2 is for phase B

current channel, and HZCCRDIF 3 is for phase C current channel.

All the ALARM output signals are connected to LED 5.




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EARTH-FAULT PROTECTION

EFLPTOC1

Io>(1)

51N-1(1)

BLOCK START

OPERATEIo

ENA_MULT

EFHPTOC1

Io>>(1)

51N-2(1)

BLOCK START

OPERATEIo

ENA_MULT

GUID-A45C3D99-3B0D-48D9-B152-6BEEBBC29A82 V1 EN

Figure 15: Earth-fault protection

Two stages are offered for non-directional earth-fault protection. The operate

signals of the earth-fault protections are connected to the Master Trip.

X120-BI2

X100 PO2

LED 8

OR

SELGAPC3

OUT_2IN_4

CIRCUIT BREAKER FAILURE PROTECTION

SELGAPC1

OUT_2IN_2

CB Closed Position

SELGAPC4

OUT_8IN_16

OSWGAPC14

OUTIN_7

EFLPTOC1_OPERATE

HIPDIF3_OPERATE

HIPDIF1_OPERATE

HIPDIF2_OPERATE

EFHPTOC1_OPERATE

51BF/51NBF(1)

3I

Io

START TRRET

TRBU

POSCLOSE

CB_FAULT

BLOCK

CB_FAULT_AL

CCBRBRF1

3I>/Io>BF(1)

GUID-03078895-719E-4704-84A7-EDFFBE60DD4A V1 EN

Figure 16: Circuit breaker failure protection

The circuit-breaker failure protection (CCBRBRF1) is initiated via the start input

by a number of different protection stages in the IED. CCBRBRF1 offers different

operating modes associated with the circuit breaker position and the measured

phase and residual currents. CCBRBRF1 has two operating outputs: TRRET and

TRBU. The TRRET operate output is used for retripping its own circuit breaker

through Master Trip 2. The TRBU output is used to give a backup trip to the circuit-

breaker feeding upstream. For this purpose, the TRBU operate output signal is




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connected to the output PO2 (X100: 8-9). LED 8 is used for backup (TRBU)

operate indication.

3.5.3.2 Functional diagrams for disturbance recorderDISTURBANCE RECORDER

LED 6

OR

HIPDIF1_OPERATE

HIPDIF2_OPERATE

HIPDIF3_OPERATE

EFLPTOC1_OPERATE

EFHPTOC1_OPERATE

OR

RDRE1C1

C2

C3

C4

C5

C6

C7

C8

C9

C10

C11C12

C13

C14C15

C16

C17

C18

C19

C20

C21

C22

TRIGGERED

OSWGAPC12

OUTIN_4

SELGAPC4

OUT_6IN_14HIPDIF1_START

HIPDIF2_START

HIPDIF3_START

EFHPTOC1_START

EFLPTOC1_START

SELGAPC1_ Blocking

SELGAPC1_ CB Closed Position

SELGAPC1_ CB Open Position

CCBRBRF1_TRRET

CCBRBRF1_TRBU

HZCCRDIF1_ALARM

HZCCRDIF2_ALARMHZCCRDIF3_ALARM

SELGAPC1_External Trip

SG_1_ACT

SG_2_ACT

SG_3_ACT

SG_4_ACT

SG_5_ACT

SG_6_ACT

GUID-76A45579-A1D9-4048-8A86-BB2AFC0CE8C7 V1 EN

Figure 17: Disturbance recorder

All start and operate signals from the protection stages are routed to trigger the

disturbance recorder or alternatively only to be recorded by the disturbance

recorder depending on the parameter settings. Additionally, the selectedautoreclosing output signals and the three binary inputs from X120 are also

connected. The active setting group is also to be recorded via SG_1_ACT to

SG_6_ACT. The disturbance recorder triggered signal indication is connected to

LED 6.

T ab le 13 : D istu rb anc e re co rd er bin ary ch an nel de fa ult v alu eChannel number Channel id text Level trigger modeBinary channel 1 HIPDIF1_START 1=positive or rising

Binary channel 2 HIPDIF2_START 1=positive or rising

Binary channel 3 HIPDIF3_START 1=positive or rising

Binary channel 4 EFLPTOC1_START 1=positive or rising

Binary channel 5 EFHPTOC1_START 1=positive or rising

Binary channel 6 HIPDIF1/2/3_OPERATE 4=level trigger off

Binary channel 7 EFxPTOC1_OPERATE 4=level trigger off

Binary channel 8 SELGAPC1_Blocking 4=level trigger off

Binary channel 9 SELGAPC1_CB_Closed 4=level trigger off

Binary channel 10 SELGAPC1_CB_Open 4=level trigger off

Binary channel 11 CCBRBRF1_TRRET 4=level trigger off

Binary channel 12 CCBRBRF1_TRBU 4=level trigger off

Table continues on next page




37/72

Channel number Channel id text Level trigger modeBinary channel 13 HZCCRDIF1_ALARM 1=positive or rising

Binary channel 14 HZCCRDIF2_ALARM 1=positive or rising

Binary channel 15 HZCCRDIF3_ALARM 1=positive or rising

Binary channel 16 SELGAPC1_External Trip 4=level trigger off

Binary channel 17 SG_1_ACT 4=level trigger off






X120-BI3

OR

LED 7

TRIP CIRCUIT SUPERVISION

SELGAPC1

OUT_3IN_3

TRPPTRC1_TRIP

TRPPTRC2_TRIP

TCSSCBR1

BLOCK ALARM

TCSSCBR2

BLOCK ALARM

SELGAPC2

OUT_1

IN_2 OUT_2

OSWGAPC13

OR OUT

IN_5

IN_6

SELGAPC4

OUT_7IN_15

CB Open Position

GUID-535EAC11-8657-4F5B-BAB2-E91FF795C817 V1 EN

Figure 18: Trip circuit supervision

Two separate trip circuit supervision functions are included, TCSSCBR1 for PO3

(X100:15-19) and TCSSCBR2 for PO4 (X100:20-24). Both functions are blocked

by the Master Trip (TRPPTRC1 and TRPPTRC2) and the circuit breaker open

position. The TCS alarm indication is connected to LED 7.




38/72

3.5.3.3 Functional diagrams for control and interlocking

X100 PO3

X100 PO4

MASTER TRIP #1

MASTER TRIP #2

OR

OR

SELGAPC3

OUT_6IN_2

SELGAPC3

OUT_5IN_1TRIP

CL_LKOUT

BLOCK

RST_LKOUT

TRPPTRC1

OPERATE

TRIP

CL_LKOUT

BLOCK

RST_LKOUT

TRPPTRC2

OPERATE

SELGAPC1_RST_LKOUT

CBXCBR1_EXE_OP



SELGAPC1_RST_LKOUT

HIPDIF1_OPERATE

HIPDIF2_OPERATE

HIPDIF3_OPERATE

EHLPTOC1_OPERATE

EFHPTOC1_OPETATE

CCBRBRF1_TRRET

HIPDIF1_OPERATE

HIPDIF2_OPERATE

HIPDIF3_OPERATE

EHLPTOC1_OPERATE

EFHPTOC1_OPETATE

OSWGAPC2

OR

IN_1

IN_2

IN_3

IN_4

IN_5

IN_6

OUT

OR

OSWGAPC1

OR

IN_1

IN_2

IN_3

IN_4

IN_5

OUT

GUID-AFCBCEC5-678B-4F8B-9963-FFE91A7F1233 V1 EN

Figure 19: Master trip

The operate signals from the protections and an external trip are connected to the

two trip output contacts PO3 (X100:15-19) and PO4 (X100:20-24) via the

corresponding Master Trips TRPPTRC1 and TRPPTRC2. Open control commands

to the circuit breaker from local or remote CBXCBR1_EXE_OP or from the

autoreclosing DARREC1_OPEN_CB are connected directly to the output contact

PO3 (X100:15-19).

TRPPTRC1 and 2 provide the lockout/latching function, event generation and the

trip signal duration setting. One binary input through SELGAPC1 can be connected

to the RST_LKOUT input of Master Trip. If the lockout operation mode is

selected, it is used to enable external reset.




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X120-BI2

X120-BI3

ANDTRPPTRC1_TRIP

TRPPTRC2_TRIP

CBXCBR1_EXE_OP

X100 PO1

CIRCUIT BREAKER CONTROL

Always True

CBXCBR1

ENA_OPEN

SELECTED

EXE_OP

EXE_CL

ENA_CLOSE

BLK_OPEN

BLK_CLOSE

AU_OPEN

AU_CLOSE

POSOPEN

POSCLOSE

OPENPOS

CLOSEPOS

OKPOS

OPEN_ENAD

CLOSE_ENAD

ITL_BYPASS

SELGAPC3

OUT_1IN_3

CB Closed Position

CB Open Position

SELGAPC1

OUT_2

IN_3

IN_2

OUT_3

IN_5 OUT_4

GUID-F781E05E-B262-4A46-BDF7-CD977EE33086 V1 EN

Figure 20: Circuit breaker control

The ENA_CLOSE input, which enables the closing of the circuit breaker, is a

status of the Master Trip in the circuit breaker control function block CBXCBR.An always true signal is also connected to ENA_CLOSE via SELGAPC1 by

default. The open operation is always enabled.

X100 SO1

X100 SO2

COMMON ALARM INDICATION 1 & 2

SELGAPC3

OUT_3IN_5

OUT_4IN_9

TPGAPC1

IN1 OUT1

TPGAPC3

IN1 OUT1

PHLPTOC1_OPERATE

PHHPTOC1_OPERATE

PHHPTOC2_OPERATE

PHIPTOC1_OPERATE

EFHPTOC1_OPERATE

OSWGAPC7

OR

IN_1

IN_2

IN_3

IN_4

IN_5

OUT

PHLPTOC1_START

PHHPTOC1_START

PHHPTOC2_START

PHIPTOC1_START

EFHPTOC1_START

OSWGAPC3

OR

IN_1

IN_2

IN_3

IN_4

IN_5

OUT

GUID-59A0BE26-527F-475F-AF43-2F1A2BD7FC14 V1 EN

Figure 21: Common alarm indication

The signal outputs from the IED are connected to give dedicated information on:

Start of any protection function SO1 (X100:10-12).

Operation (trip) of any protection function SO2 (X100: 13-15).

TPGAPC are timers and used for setting the minimum pulse length for the outputs.

There are seven generic timers (TPGAPC17) available in the IED.




40/72

3.5.4 Switch groupsIn standard configuration A, the switch group function blocks are organized in four

groups: binary inputs, internal signal, GOOSE as well as binary outputs and LEDs.

GOOSE

Binary Inputs Protection and Control

GOOSE

GOOSE

GOOSE

Binary Inputs

(1...4)

Received GOOSE

(0...19)

Binary Outputs and LEDs

OSWGAPC2

OSWGAPC1

OSWGAPC16

OSWGAPC15

OSWGAPC14

OSWGAPC13

OSWGAPC12

OSWGAPC11

SELGAPC4

LEDs

SELGAPC3

Binary Outputs

OSWGAPC10

OSWGAPC9

OSWGAPC8

OSWGAPC7

OSWGAPC6

OSWGAPC5

OSWGAPC4

OSWGAPC3

Binary Outputs

(1...6)

LEDs

(18)

HIPDIF1 HIPDIF2

HIPD IF 3 E FLP TO C1

EFHPTOC1 HZCCRDIF1

HZCCRDIF2 HZCCRDIF3

CBXCBR1

TCSSCBR1 TCSSCBR2

CCBRBRF1

SELGAPC1

Binary Inputs

ISWGAPC1

SELGAPC2

Blocking

TCS Blocking

ISWGAPC9

GOOSE Blocking

ISWGAPC10

GOOSE Block CBAlarm

Trip

Start

Master trip

Internal Signal

GUID-E6D66B73-6C09-4979-9E08-49CEFEC60BD3 V1 EN

Figure 22: Standard configuration A switch group overview

3.5.4.1 Binary inputsThe binary inputs group includes one SELGAPC and one ISWGAPC. SELGAPC1

is used to route binary inputs to ISWGAPC or directly to IED functions.

ISWGAPC1 is used to configure the signal to block the protection functions.

SELGAPC1 ISWGAPC1Blocking 1

HIPDIF1_BLOCK

HIPDIF2_BLOCK

HIPDIF3_BLOCK

EFLPTOC1_BLOCK

EFHPTOC1_BLOCK

HZCCRDIF1_BLOCK

HZCCRDIF2_BLOCK

HZCCRDIF3_BLOCK

X120-BI1

X120-BI2

X120-BI3

X120-BI4

GUID-77ACA5A9-62F9-43BB-835B-016DE800A3C4 V1 EN

Figure 23: Binary inputs

SELGAPC1SELGAPC1 has inputs from IED binary inputs. IN_1 to IN_4 are binary inputs

from X100. An always true signal is connected to IN_5. SELGAPC1 outputs are

used to route inputs to different functions. By setting SELGAPC1, binary inputs

can be configured for different purposes.




41/72

SELGAPC1

CB Closed Position

CB Open Position CBXCBR1_POSOPEN

SELGAPC2_IN_2

Blocking 1

External Trip

PROTECTION_BI_SG_2Setting Group 2



ISWGAPC1_INX120/1-2 BI1

X120/3-2 BI2

X120/4-2 BI3

X120/5-6 BI4

IN_1

IN_2

IN_3

IN_4

IN_5

TRPTTRC1_OPERATE

TRPTTRC2_OPERATE

X120-BI1

X120-BI2

X120-BI3

X120-BI4

Always True

OUT_1

OUT_2

OUT_3

OUT_4

OUT_5

OUT_6

OUT_7

OUT_8

OUT_9

CBXCBR1_ENA_CLOSE

TRPTTRC1_RST_LKOUT

TRPTTRC2_RST_LKOUT

TRPTTRC1/2_

RST_LKOUT

CB Close Enable

CBXCBR1_POSCLOSE

SELGAPC2_IN_1

GUID-C41611AC-B385-438D-AF2F-DACEC6B69B48 V1 EN

Figure 24: SELGAPC1

ISWGAPC1ISWGAPC1 is used for general blocking. ISWGAPC1 input is from SELGAPC1

output OUT_1 Blocking 1. ISWGAPC1 outputs are connected to BLOCK inputs of

protection functions. Select which protection functions are to be blocked by

changing ISWGAPC1 parameters.

ISWGAPC1

IN

OUT_1

OUT_2

OUT_3

OUT_4

OUT_5

OUT_6

OUT_7

OUT_8

Blocking 1SELGAPC1_OUT_1

HIPDIF1_BLOCK

HIPDIF2_BLOCK

HIPDIF3_BLOCK

EFLPTOC1_BLOCK

EFHPTOC1_BLOCK

HZCCRDIF1_BLOCK

HZCCRDIF2_BLOCK

HZCCRDIF3_BLOCK

GUID-404D31F7-C132-46B4-8AFA-321C80881FA3 V1 EN

Figure 25: ISWGAPC1

3.5.4.2 Internal signalThe internal signal group is used to configure the logic connections between

function blocks. There is one SELGAPC in this group.

SELGAPC2 is used to configure trip circuit supervision blocking from the circuit

breaker open or close position.




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SELGAPC2 TCSSCBR1_BLOCK

TCSSCBR2_BLOCK

SELGAPC1_OUT_2

SELGAPC1_OUT_3

CB Closed Position

CB Open Position

GUID-DB5EA70F-6249-400F-90B2-DB7D1758B4BC V1 EN

Figure 26: Internal signal

SELGAPC2SELGAPC2 inputs are circuit breaker closed and open positions from SELGACP1.

SELGAPC2 outputs are routed to the BLOCK input of the trip circuit supervision

TCSSCBR1 and TCSSCBR2.

By default, X100 PO3 and PO4 are both used for the open circuit breaker.

TCSSCBR1 and TCSSCBR2 are both blocked by the circuit breaker open position.

If X100-PO3 is used for closing the circuit breaker, TCSSCBR1 needs to be

blocked by the circuit breaker close position (OUT_1 connection=IN_1). If X100-

PO4 is used for closing the circuit breaker, TCSSCBR2 needs to be blocked by the

circuit breaker close position (OUT_2 connection=IN_1).

SELGAPC2

IN_1

IN_2

OUT_1

OUT_2

TCSSCBR1_BLOCK

TCSSCBR2_BLOCK

SELGAPC1_OUT_2

SELGAPC1_OUT_3

CB Closed Position

CB Open Position

GUID-9F97A340-1373-49E8-A0D1-F0FBDFB9B753 V1 EN

Figure 27: SELGAPC2

3.5.4.3 Binary outputs and LEDsIn standard configuration A, the signals route to binary outputs, and LEDs are

configured by OSWGAPCs. There are totally 15 OSWGAPC instances. They can

be categorized to four groups, including one Master trip, four start, four trip and six

alarm signals. The OSWGAPC output is connected to binary outputs and LEDs via

SELGAPC3 and SELGAPC4.

SELGAPC3 is used to configure OSWGAPC signals to IED binary outputs.

SELGAPC4 is used to configure OSWGAPC signals to LEDs.

OSWGAPC1 is used for Master trip. The inputs are from protection functions

operate and circuit-breaker failures re-trip. OSWGAPC2 is not in used.

OSWGAPC3 to OSWGAPC6 are used for the start signal. The inputs are start

signals from the protection functions.

OSWGAPC7 to OSWGAPC10 are used for the trip signal. The inputs are

operation signals from the protection functions.

OSWGAPC11 to OSWGAPC16 are used for the alarm signal. The inputs are

alarm signals from the protection and monitoring functions.




43/72

Master Trip 1

Trip 1

Trip 2

Trip 3

Trip 4

HZCCRDIF1_ALARM

HZCCRDIF2_ALARM

HZCCRDIF3_ALARM

RDRE_TRIGGERED

TCSSCBR1_ALARM

TCSSCBR2_ALARM

CCBRBRF1_TRBU

CCBRBRF1_TRRET

SELGAPC1_OUT_6

TRPPTRC1_CL_LKOUT

TRPPTRC2_CL_LKOUT

OSWGAPC12 Alarm 2

OSWGAPC13 Alarm 3

OSWGAPC14 Alarm 4

OSWGAPC1

OSWGAPC3

OSWGAPC11 Alarm 1

TRPPTRC1

TPGAPC3

TPGAPC4

TPGAPC5

TPGAPC6

SELGAPC3

HIPDIF1_OPERATE

HIPDIF2_OPERATE

HIPDIF3_OPERATE

EFLPTOC1_OPERATE

EFHPTOC1_OPERATE

CCBRBRF1_TRRET

HIPDIF1_START

HIPDIF2_START

HIPDIF3_START

EFLPTOC1_START

EFHPTOC1_START

OSWGAPC8

OSWGAPC7

OSWGAPC10

OSWGAPC9

X100 PO1

X100 PO2

X100 SO1

X100 SO2

X100 PO3

X100 PO4

Start 1

Start 2

TPGAPC1

OSWGAPC4

OSWGAPC5 Start 3

Start 4

TPGAPC2

OSWGAPC6

OSWGAPC15 Alarm 5

OSWGAPC16 Alarm 6

TPGAPC7

IN1 OUT1

IN2 OUT2

IN1 OUT1

IN2 OUT2

IN1 OUT1

IN2 OUT2

IN1 OUT1

IN2 OUT2

IN1 OUT1

IN2 OUT2

IN1 OUT1

IN2 OUT2

IN1 OUT1

IN2 OUT2

Master Trip 2OSWGAPC2 TRPPTRC2

HIPDIF1_OPERATE

HIPDIF2_OPERATE

HIPDIF3_OPERATE

EFLPTOC1_OPERATE

EFHPTOC1_OPERATE

GUID-9968F50A-8710-4EF7-A980-78A82488B59D V1 EN

Figure 28: Binary outputs




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Trip 1

Trip 2

Trip 3

Trip 4

OSWGAPC3

OSWGAPC11 Alarm 1

SELGAPC4

OSWGAPC8

OSWGAPC7

OSWGAPC10

OSWGAPC9

Start 1

Start 2OSWGAPC4

OSWGAPC5 Start 3

Start 4OSWGAPC6

LED1

LED2

LED3

LED4

LED5

LED6

LED7

LED8

OSWGAPC12 Alarm 2

OSWGAPC13 Alarm 3

OSWGAPC14 Alarm 4

OSWGAPC15 Alarm 5

OSWGAPC16 Alarm 6

HZCCRDIF1_ALARM

HZCCRDIF2_ALARM

HZCCRDIF3_ALARM

RDRE_TRIGGERED

TCSSCBR1_ALARM

TCSSCBR2_ALARM

CCBRBRF1_TRBU

CCBRBRF1_TRRET

SELGAPC1_OUT_6

TRPPTRC1_CL_LKOUT

TRPPTRC2_CL_LKOUT

HIPDIF1_OPERATE

HIPDIF2_OPERATE

HIPDIF3_OPERATE

EFLPTOC1_OPERATE

EFHPTOC1_OPERATECCBRBRF1_TRRET

HIPDIF1_START

HIPDIF2_START

HIPDIF3_START

EFLPTOC1_START

EFHPTOC1_START

HIPDIF1_OPERATE

HIPDIF2_OPERATE

HIPDIF3_OPERATE

EFLPTOC1_OPERATE

EFHPTOC1_OPERATE



GUID-DC07ECE8-4492-4836-A9DF-53696F581F9B V1 EN

Figure 29: LEDs

SELGAPC3SELGAPC3 is used to configure the OSWGAPC outputs to the IED binary

outputs. The Master trip signals are connected to SELGAPC3 via TRPPTRC. Start,

trip and alarm signals are connected to SELGAPC3 via TPGAPC. TPGAPC are

timers and used for setting the minimum pulse length for the outputs.

SELGAPC3 outputs are connected with X100 binary outputs.




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SELGAPC3

IN_1

IN_2

IN_3

IN_4

IN_5

IN_6

IN_7

IN_8

IN_9

IN_10

IN_11

IN_12

IN_13

OUT_1

OUT_2

OUT_3

OUT_4

OUT_5

OUT_6

IN_14

IN_15

IN_16

IN_17

IN_18

X100 PO1

X100 PO2

X100 SO1

X100 SO2

X100 PO3

X100 PO4

OSWGAPC11_OUT

OSWGAPC12_OUT

OSWGAPC13_OUT

OSWGAPC14_OUT

OSWGAPC15_OUT

OSWGAPC16_OUT

OSWGAPC5_OUT

OSWGAPC6_OUT

OSWGAPC7_OUT

OSWGAPC8_OUT

OSWGAPC9_OUT

OSWGAPC10_OUT

OSWGAPC3_OUT

OSWGAPC4_OUT

Start 1

Start 2

Start 3

Start 4

Trip 1

Alarm 1

Trip 2

Trip 3

Trip 4

Alarm 2

Alarm 3

Alarm 4

Alarm 5

Alarm 6

Backup Trip

CBXCBR_EXE_OP

TRPPTRC1_TRIP

TRPPTRC2_TRIP

CCBRBRF1_TRBU

CB Open 1

CB Close

TPGAPC1

IN1 OUT1

IN2 OUT2

TPGAPC7

IN1 OUT1

IN2 OUT2

TPGAPC6

IN1 OUT1

IN2 OUT2

TPGAPC5

IN1 OUT1

IN2 OUT2

TPGAPC4

IN1 OUT1

IN2 OUT2

TPGAPC3

IN1 OUT1

IN2 OUT2

TPGAPC2

IN1 OUT1

IN2 OUT2

CBXCBR_EXE_CL

CB Open 2

GUID-7460958A-CAC2-40A0-917E-AAFD885C806B V1 EN

Figure 30: SELGAPC3

SELGAPC4SELGAPC4 is used to configure the OSWGAPC outputs to LEDs. Master trip

signals are connected to SELGAPC4 via TRPPTRC. Start, trip and alarm signals

are connected to SELGAPC4 directly. SELGAPC4 outputs are connected toprogrammable LED1 to LED8.




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SELGAPC4

IN_1

IN_2

IN_3

IN_4

IN_5

IN_6

IN_7

IN_8

IN_9

IN_10

IN_11

IN_12

IN_13

OUT_1

OUT_2

OUT_3

OUT_4

OUT_5

OUT_6

OUT_7

OUT_8

IN_14

IN_15

IN_16

IN_17

IN_18

LED1

LED2

LED3

LED4

LED5

LED6

LED7

LED8

Start 1

Start 2

Start 3

Start 4

Trip 1

Alarm 1

Trip 2

Trip 3

Trip 4

Alarm 2

Alarm 3

Alarm 4

Alarm 5

Alarm 6

OSWGAPC11_OUT

OSWGAPC12_OUT

OSWGAPC13_OUT

OSWGAPC14_OUT

OSWGAPC15_OUT

OSWGAPC16_OUT

OSWGAPC5_OUT

OSWGAPC6_OUT

OSWGAPC7_OUT

OSWGAPC8_OUT

OSWGAPC9_OUT

OSWGAPC10_OUT

OSWGAPC3_OUT

OSWGAPC4_OUT

CCBRBRF1_TRBU Backup Trip

CB Close

CB Open 1CBXCBR_EXE_OP

TRPPTRC1_TRIP

CBXCBR_EXE_CL

TRPPTRC2_TRIP CB Open 2

GUID-ACEEEFCD-3CA8-4157-BD3E-1A3A6FD8AD1B V1 EN

Figure 31: SELGAPC4

Master trip OSWGAPCsOSWGAPC1 and OSWGAPC2 are used to route the protection function operate

signals to Master trip. OSWGAPC1 and OSWGAPC2 have the same inputs from

the protection function operates. The output is connected to the TRPPTRCfunction. The default connections for OSWGAPC1 and OSWGAPC2 are different.




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OSWGAPC1

IN_1

IN_2

IN_3

IN_4

IN_5

IN_6

OUT

EFHPTOC1_OPERATE

CCBRBRF1_TRRET

HIPDIF1_OPERATE

EFLPTOC1_OPERATE

HIPDIF3_OPERATE

HIPDIF2_OPERATE

TRPPTRC 1_OPERATEMaster trip 1

GUID-C9E4582D-E2A6-4F08-9F45-E2DDF5549526 V1 EN

Figure 32: OSWGAPC1

OSWGAPC2

IN_1

IN_2

IN_3

IN_4

IN_5

IN_6

OUT

EFHPTOC1_OPERATE

CCBRBRF1_TRRET

HIPDIF1_OPERATE

EFLPTOC1_OPERATE

HIPDIF3_OPERATE

HIPDIF2_OPERATE

TRPPTRC 2_OPERATEMaster trip 2

GUID-58E5C510-F4F4-48A6-A334-C463F463FAB5 V1 EN

Figure 33: OSWGAPC2

Start OSWGAPCsOSWGAPC instances 3 to 6 are used to configure the protection start signals.

These four OSWGAPCs have the same inputs from the protection function start

signals. The output is routed to SELGAPC3 via TPGAPC timer and to SELGAPC4

directly.

OSWGAPC3

IN_1

IN_2

IN_3

IN_4

IN_5

OUT

EFHPTOC1_START

HIPDIF1_START

EFLPTOC1_START

HIPDIF3_START

HIPDIF2_START

TPGAPC1_IN1

SELGAPC4_IN_5Start 1

GUID-3E6D87B9-F5F4-45E6-BD3D-180132AB6953 V1 EN

Figure 34: OSWGAPC3




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Start 2 TPGAPC1_IN2

SELGAPC4_IN_6

OSWGAPC4

IN_1

IN_2

IN_3

IN_4

IN_5

OUT

EFHPTOC1_START

HIPDIF1_START

EFLPTOC1_START

HIPDIF3_START

HIPDIF2_START

GUID-96AAE2FE-0993-4797-AF9A-A59E1BDB1557 V1 EN

Figure 35: OSWGAPC4

Start 3 TPGAPC2_IN1

SELGAPC4_IN_7

OSWGAPC5

IN_1

IN_2

IN_3

IN_4

IN_5

OUT

EFHPTOC1_START

HIPDIF1_START

EFLPTOC1_START

HIPDIF3_START

HIPDIF2_START

GUID-EB5F5E18-7137-4ED8-9D38-B5676EA20C67 V1 EN

Figure 36: OSWGAPC5

Start 4 TPGAPC2_IN2

SELGAPC4_IN_8

OSWGAPC6

IN_1

IN_2

IN_3

IN_4

IN_5

OUT

EFHPTOC1_START

HIPDIF1_START

EFLPTOC1_START

HIPDIF3_START

HIPDIF2_START

GUID-C924A4BA-AC97-420E-B676-C8C176D19B62 V1 EN

Figure 37: OSWGAPC6

Trip OSEGAPCsOSWGAPC instances 7 to 10 are used to configure the protection operate signals

that belong to the trip group. These four OSWGAPCs have the same inputs from

the operate signals of the protection functions. The output is routed to SELGAPC3

via TPGAPC timer and to SELGAPC4 directly.




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Trip 1 TPGAPC3_IN1

SELGAPC4_IN_9

OSWGAPC7

IN_1

IN_2

IN_3

IN_4

IN_5

OUT

EFHPTOC1_OPERATE

HIPDIF1_OPERATE

EFLPTOC1_OPERATE

HIPDIF3_OPERATE

HIPDIF2_OPERATE

GUID-578079DE-E1D7-4F59-A45F-9809AEE5D316 V1 EN

Figure 38: OSWGAPC7

Trip 2 TPGAPC3_IN2

SELGAPC4_IN_10

OSWGAPC8

IN_1

IN_2

IN_3

IN_4

IN_5

OUT

EFHPTOC1_OPERATE

HIPDIF1_OPERATE

EFLPTOC1_OPERATE

HIPDIF3_OPERATE

HIPDIF2_OPERATE

GUID-4FC22392-CF64-4B6E-B015-A41720B2155F V1 EN

Figure 39: OSWGAPC8

Trip 3 TPGAPC4_IN1

SELGAPC4_IN_11

OSWGAPC9

IN_1

IN_2

IN_3

IN_4

IN_5

OUT

EFHPTOC1_OPERATE

HIPDIF1_OPERATE

EFLPTOC1_OPERATE

HIPDIF3_OPERATE

HIPDIF2_OPERATE

GUID-A21FDE7D-FC0E-4957-B55A-E372C4622BA0 V1 EN

Figure 40: OSWGAPC9




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Trip 4 TPGAPC4_IN2

SELGAPC4_IN_12

OSWGAPC10

IN_1

IN_2

IN_3

IN_4

IN_5

OUT

EFHPTOC1_OPERATE

HIPDIF1_OPERATE

EFLPTOC1_OPERATE

HIPDIF3_OPERATE

HIPDIF2_OPERATE

GUID-AB3796EF-B15B-4007-B4CA-FD7CEA0C111A V1 EN

Figure 41: OSWGAPC10

Alarm OSEGAPCsOSWGAPC instances 11 to 16 are used to configure the alarm signals that belongto the alarm group. These six OSWGAPCs have the same inputs from the alarm

signals. The output is routed to SELGAPC3 via TPGAPC timer and to SELGAPC4

directly.

Alarm 1 TPGAPC5_IN1

SELGAPC4_IN_13

OSWGAPC11

IN_1

IN_2

IN_3

IN_4

IN_5

IN_6

IN_7

IN_8

IN_9

IN_10

IN_11

OUT

TCSSCBR1_ALARM

TCSSCBR2_ALARM

TRPPTRC1_CL_LKOUT

TRPPTRC2_CL_LKOUT

HZCCRDIF1_ALARM

RDRE_TRIGGERED

CCBRBRF1_TRBU

CCBRBRF1_TRRET

SELGAPC1_OUT_6

HZCCRDIF3_ALARM

HZCCRDIF2_ALARM

External Trip

GUID-5ADF1ED1-B09A-45E0-9CBB-B51884694F25 V1 EN





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Alarm 2 TPGAPC5_IN2

SELGAPC4_IN_14

OSWGAPC12

IN_1

IN_2

IN_3

IN_4

IN_5

IN_6

IN_7

IN_8

IN_9

IN_10

IN_11

OUT

TCSSCBR1_ALARM

TCSSCBR2_ALARM

TRPPTRC1_CL_LKOUT

TRPPTRC2_CL_LKOUT

HZCCRDIF1_ALARM

RDRE_TRIGGERED

CCBRBRF1_TRBU

CCBRBRF1_TRRET

SELGAPC1_OUT_6

HZCCRDIF3_ALARM

HZCCRDIF2_ALARM

External Trip

GUID-34F14C25-B0E0-4F04-8497-79F61F419523 V1 EN


Alarm 3 TPGAPC6_IN1

SELGAPC4_IN_15

OSWGAPC13

IN_1

IN_2

IN_3

IN_4

IN_5

IN_6

IN_7

IN_8

IN_9

IN_10

IN_11

OUT

TCSSCBR1_ALARM

TCSSCBR2_ALARM

TRPPTRC1_CL_LKOUT

TRPPTRC2_CL_LKOUT

HZCCRDIF1_ALARM

RDRE_TRIGGERED

CCBRBRF1_TRBU

CCBRBRF1_TRRET

SELGAPC1_OUT_6

HZCCRDIF3_ALARM

HZCCRDIF2_ALARM

External Trip

GUID-EAAD4D7D-53DB-4B8B-BB92-4ECD6D0E577F V1 EN





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Alarm 4 TPGAPC6_IN2

SELGAPC4_IN_16

OSWGAPC14

IN_1

IN_2

IN_3

IN_4

IN_5

IN_6

IN_7

IN_8

IN_9

IN_10

IN_11

OUT

TCSSCBR1_ALARM

TCSSCBR2_ALARM

TRPPTRC1_CL_LKOUT

TRPPTRC2_CL_LKOUT

HZCCRDIF1_ALARM

RDRE_TRIGGERED

CCBRBRF1_TRBU

CCBRBRF1_TRRET

SELGAPC1_OUT_6

HZCCRDIF3_ALARM

HZCCRDIF2_ALARM

External Trip

GUID-41241979-58B4-4C96-8B31-5560C6EC5D53 V1 EN


Alarm 5 TPGAPC7_IN1

SELGAPC4_IN_17

OSWGAPC15

IN_1

IN_2

IN_3

IN_4

IN_5

IN_6

IN_7

IN_8

IN_9

IN_10

IN_11

OUT

TCSSCBR1_ALARM

TCSSCBR2_ALARM

TRPPTRC1_CL_LKOUT

TRPPTRC2_CL_LKOUT

HZCCRDIF1_ALARM

RDRE_TRIGGERED

CCBRBRF1_TRBU

CCBRBRF1_TRRET

SELGAPC1_OUT_6

HZCCRDIF3_ALARM

HZCCRDIF2_ALARM

External Trip

GUID-11D24650-BED9-487F-B267-2290293D9541 V1 EN





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Alarm 6 TPGAPC7_IN2

SELGAPC4_IN_18

OSWGAPC16

IN_1

IN_2

IN_3

IN_4

IN_5

IN_6

IN_7

IN_8

IN_9

IN_10

IN_11

OUT

TCSSCBR1_ALARM

TCSSCBR2_ALARM

TRPPTRC1_CL_LKOUT

TRPPTRC2_CL_LKOUT

HZCCRDIF1_ALARM

RDRE_TRIGGERED

CCBRBRF1_TRBU

CCBRBRF1_TRRET

SELGAPC1_OUT_6

HZCCRDIF3_ALARM

HZCCRDIF2_ALARM

External Trip

GUID-FD9EDBEE-F36B-4128-8D8C-3BFCB7E6967F V1 EN


3.5.4.4 GOOSEIn the configuration, there are 20 GOOSERCV_BIN functions. Each

GOOSERVC_BIN function can be connected to one received binary GOOSEsignal. The signal connection can be configured in PCM600.

GOOSERCV_BIN instances 0 and 1 are used for blocking protection

functions. Signals from these two GOOSERCV_BINs are connected to

ISWGAPC9. ISWGAPC9 is used to configure which protection function block

is blocked.

GOOSERCV_BIN instances 2 and 3 are used for tripping from GOOSE.

Signals from these two GOOSERCV_BINs are connected to TRPPTRC1 and

TRPPTRC2 trip.

GOOSERCV_BIN instances 4 to 19 are used for blocking the circuit breaker

operation. Signals from these 16 GOOSERCV_BINs are connected to

ISWGAPC10. ISWGAPC10 is used to configure the GOOSE input signal to

block the circuit breaker open or close operation.




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GOOSERCV_BIN:1

GOOSERCV_BIN:0

OR ISWGAPC9GOOSE Blcoking

GOOSERCV_BIN:3

GOOSERCV_BIN:2

OR

GOOSE

External Trip

GOOSERCV_BIN:5

GOOSERCV_BIN:4

GOOSERCV_BIN:19

OR ISWGAPC10GOOSE Block CB

HIPDIF1_BLOCK

HIPDIF2_BLOCK

HIPDIF3_BLOCK

EFLPTOC1_BLOCK

EFHPTOC1_BLOCK

HZCCRDIF1_BLOCK

HZCCRDIF2_BLOCK

HZCCRDIF3_BLOCK

CBXCBR1_BLK_CLOSE

CBXCBR1_BLK_OPEN

TRPPTRC1_OPERATE

TRPPTRC2_OPERATE

GUID-F0B9A987-3F7E-4180-BA29-99A3F602B38E V1 EN

Figure 48: GOOSE overview

ISWGAPC9ISWGAPC9 is used to configure which protection functions can be blocked by thereceived GOOSE signals. ISWGAPC9 inputs are received GOOSE signals from

GOOSERCV_BIN:0 and GOOSERCV_BIN:1. The outputs are connected to the

block inputs of the protection functions.

GOOSE Blocking

ISWGAPC9

IN

OUT_1

OUT_2

OUT_3

OUT_4

OUT_5

OUT_6

OUT_7

OUT_8

HIPDIF1_BLOCK

HIPDIF2_BLOCK

HIPDIF3_BLOCK

EFLPTOC1_BLOCK

EFHPTOC1_BLOCK

HZCCRDIF1_BLOCK

HZCCRDIF2_BLOCK

HZCCRDIF3_BLOCK

GOOSERCV_BIN:0_OUT

GOOSERCV_BIN:1_OUT

GUID-C0121EA1-DD3D-428C-BEB9-2B7613F1DC46 V1 EN

Figure 49: ISWGAPC9




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ISWGAPC10ISWGAPC10 is used to block the circuit breaker operation from the received

GOOSE signals. ISWGAPC10 inputs are received GOOSE signals from

GOOSERCV_BIN:4 to GOOSERCV_BIN:19. The outputs are connected to block

the circuit breaker close and open operation.

ISWGAPC10

INOUT_1

OUT_2

CBXCBR1_BLK_CLOSE

CBXCBR1_BLK_OPEN

GOOSERCV_BIN:4_OUT

GOOSERCV_BIN:5_OUT

GOOSERCV_BIN:6_OUT

...

GOOSERCV_BIN:19_OUT

GOOSE Blocking CB

GUID-8A11DD7B-6921-48B4-8AA6-5077E822E3BD V1 EN

Figure 50: ISWGAPC10




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50


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Section 4 Requirements for measurementtransformers

4.1 Current transformers4.1.1 Current transformer requirements for differential protection

The sensitivity and the reliability of the protection depends on the characteristics of

the current transformers. The CTs must have an identical transformation ratio. It is

recommended that all the CTs have an identical constructions, that is, they have an

equal burden and characteristics and are of the same type, preferably from the same

manufacturing batch. If the CT characteristics and burden values are not equal,

calculations for each branch in the scheme should be performed separately and the

worst-case results should be used. In Figure 51, the CT winding resistance and the

burden of the branches are not equal, and hence, the maximum burden equal to 3.2

should be used for calculating the stabilized voltage.

1MRS757455 A Section 4Requirements for measurement transformers



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GUID-125D0534-32F1-4E09-8A34-CBF36D547735 V1 EN

Figure 51: High-impedance busbar differential protection with different CT

burden value on each feeder

First, the stabilizing voltage, that is, the voltage appearing across the measuring

branch during the out-of-zone fault, is calculated assuming that one of the CTs

connected in parallel is fully saturated. The stabilizing voltage can be calculated

using the formula:

U I

nR Rs

kin m= +

max ( )

GUID-6A4C58E7-3D26-40C9-A070-0D99BA209B1A V1 EN (Equation 1)

Ikmax the highest through-fault current in primary amps. The highest earth-fault or short circuit current

during the out-of-zone fault.

n the turns ratio of the CT

Rin the secondary winding resistance of the CT in ohms

Rm the resistance (maximum of Rin+ Rm) of the CT secondary circuit in ohms

Section 4 1MRS757455 ARequirements for measurement transformers



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The current transformers must be able to

busbar diffrential protection reb611

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