Siemens SIPROTEC 4 7VK61 User manual

SIPROTEC 4
Breaker Management
Device 7VK61
V4.7 and higher
Manual
C53000-G1176-C159-5
Preface
Open Source Software
Table of Contents
Introduction 1
Functions 2
Mounting and Commissioning 3
Technical Data 4
Ordering Information and Accessories A
Terminal Assignments B
Connection Examples C
Default Settings and Protocol-dependent
Functions D
Functions, Settings, Information E
Literature
Glossary
Index

i
i
NOTE
For your own safety, observe the warnings and safety instructions contained in this document, if available.
Disclaimer of Liability
This document has been subjected to rigorous technical
review before being published. It is revised at regular inter-
vals, and any modifications and amendments are included
in the subsequent issues. The content of this document has
been compiled for information purposes only. Although
Siemens AG has made best efforts to keep the document as
precise and up-to-date as possible, Siemens AG shall not
assume any liability for defects and damage which result
through use of the information contained herein.
This content does not form part of a contract or of business
relations; nor does it change these. All obligations of
Siemens AG are stated in the relevant contractual agree-
ments.
Siemens AG reserves the right to revise this document from
time to time.
Document version: V04.21.00
Edition: 05.2018
Version of the product described: V4.7 and higher
Copyright
Copyright © Siemens AG 2018. All rights reserved.
The disclosure, duplication, distribution and editing of this
document, or utilization and communication of the content
are not permitted, unless authorized in writing. All rights,
including rights created by patent grant or registration of a
utility model or a design, are reserved.
Trademarks
SIPROTEC™, DIGSI™, SIGUARD™, SIMEAS™, and SICAM™
are registered trademarks of Siemens AG. Any unauthor-
ized use is illegal. All other designations in this document
can be trademarks whose use by third parties for their own
purposes can infringe the rights of the owner.

Preface
Purpose of this Manual
This manual describes the functions, operation, installation, and commissioning of devices 7VK61. In partic-
ular, one will find:
•Information regarding the configuration of the scope of the device and a description of the device func-
tions and settings → Chapter 2;
•Instructions for Installation and Commissioning → Chapter 3;
•Compilation of the Technical Data → Chapter 4;
•As well as a compilation of the most significant data for advanced users → Appendix.
General information with regard to design, configuration, and operation of SIPROTEC 4 devices are set out in
the /1/ SIPROTEC 4 System Description.
Target Audience
Protection-system engineers, commissioning engineers, persons entrusted with the setting, testing and main-
tenance of selective protection, automation and control equipment, and operating personnel in electrical
installations and power plants.
Applicability of this Manual
This manual applies to: SIPROTEC 4 Breaker Management Device 7VK61; firmware version V4.7 and higher.
Angaben zur Konformität
This product complies with the directive of the Council of the European Communities on the
approximation of the laws of the Member States relating to electromagnetic compatibility
(EMC Council Directive 2004/108/EC) and concerning electrical equipment for use within
specified voltage limits (Low-voltage directive 2006/95 EC).
This conformity is proved by tests conducted by Siemens AG in accordance with the Council
Directives in agreement with the generic standards EN61000-6-2 and EN 61000-6-4 for the
EMC directive, and with the standard EN 60255-27 for the low-voltage directive.
The device has been designed and produced for industrial use.
The product conforms with the international standard of the series IEC 60255 and the German
standard VDE 0435.
Additional Standards IEEE Std C37.90 (see Chapter 4, Technical Data")
[ul-schutz-110602-kn, 1, --_--]
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Additional Support
For questions about the system, please contact your Siemens sales partner.
Support
Our Customer Support Centre provides a 24-hour service.
Tel: [phone]
Fax: [phone]
E-Mail: [email protected]
Training Courses
Inquiries regarding individual training courses should be addressed to our Training Centre:
Siemens AG
Siemens Power Academy TD
Humboldtstraße 59
90459 Nürnberg
Germany
Tel: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.siemens.com/poweracademy
Notes on Safety
This document is not a complete index of all safety measures required for operation of the equipment (module
or device). However, it comprises important information that must be followed for personal safety, as well as
to avoid material damage. Information is highlighted and illustrated as follows according to the degree of
danger:
!
DANGER
DANGER means that death or severe injury will result if the measures specified are not taken.
²Comply with all instructions, in order to avoid death or severe injuries.
!
WARNING
WARNING means that death or severe injury may result if the measures specified are not taken.
²Comply with all instructions, in order to avoid death or severe injuries.
!
CAUTION
CAUTION means that medium-severe or slight injuries can occur if the specified measures are not taken.
²Comply with all instructions, in order to avoid moderate or minor injuries.
Preface
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NOTICE
NOTICE means that property damage can result if the measures specified are not taken.
²Comply with all instructions, in order to avoid property damage.
i
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NOTE
Important information about the product, product handling or a certain section of the documentation
which must be given particular attention.
Qualified Electrical Engineering Personnel
Only qualified electrical engineering personnel may commission and operate the equipment (module, device)
described in this document. Qualified electrical engineering personnel in the sense of this manual are people
who can demonstrate technical qualifications as electrical technicians. These persons may commission,
isolate, ground and label devices, systems and circuits according to the standards of safety engineering.
Proper Use
The equipment (device, module) may be used only for such applications as set out in the catalogs and the
technical description, and only in combination with third-party equipment recommended and approved by
Siemens.
Problem-free and safe operation of the product depends on the following:
•Proper transport
•Proper storage, setup and installation
•Proper operation and maintenance
When electrical equipment is operated, hazardous voltages are inevitably present in certain parts. If proper
action is not taken, death, severe injury or property damage can result:
•The equipment must be grounded at the grounding terminal before any connections are made.
•All circuit components connected to the power supply may be subject to dangerous voltage.
•Hazardous voltages may be present in equipment even after the supply voltage has been disconnected
(capacitors can still be charged).
•Operation of equipment with exposed current-transformer circuits is prohibited. Before disconnecting the
equipment, ensure that the current-transformer circuits are short-circuited.
•The limiting values stated in the document must not be exceeded. This must also be considered during
testing and commissioning.
Typographic and Symbol Conventions
The following text formats are used when literal information from the device or to the device appear in the
text flow:
Parameter Names
Designators of configuration or function parameters which may appear word-for-word in the display of the
device or on the screen of a personal computer (with operation software DIGSI), are marked in bold letters in
monospace type style. The same applies to titles of menus.
1234A
Parameter addresses have the same character style as parameter names. Parameter addresses contain the
suffix A in the overview tables if the parameter can only be set in DIGSI via the option Display additional
settings.
Parameter Options
Possible settings of text parameters, which may appear word-for-word in the display of the device or on the
screen of a personal computer (with operation software DIGSI), are additionally written in italics. The same
applies to the options of the menus.
Preface
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Indications
Designators for information, which may be output by the relay or required from other devices or from the
switch gear, are marked in a monospace type style in quotation marks.
Deviations may be permitted in drawings and tables when the type of designator can be obviously derived
from the illustration.
The following symbols are used in drawings:
Device-internal logical input signal
Device-internal logical output signal
Internal input signal of an analog quantity
External binary input signal with number (binary input,
input indication)
External binary output signal with number
(example of a value indication)
External binary output signal with number (device indication) used as
input signal
Example of a parameter switch designated FUNCTION with address
1234 and the possible settings ON and OFF
Besides these, graphical symbols are used in accordance with IEC 60617-12 and IEC 60617-13 or similar.
Some of the most frequently used are listed below:
Analog input variable
AND-gate operation of input values
OR-gate operation of input values
Exclusive OR gate (antivalence): output is active, if only one of the
inputs is active
Coincidence gate: output is active, if both inputs are active or inactive
at the same time
Dynamic inputs (edge-triggered) above with positive, below with
negative edge
Formation of one analog output signal from a number of analog input
signals
Limit stage with setting address and parameter designator (name)
Timer (pickup delay T, example adjustable) with setting address and
parameter designator (name)
Preface
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Timer (dropout delay T, example non-adjustable)
Dynamic triggered pulse timer T (monoflop)
Static memory (SR flipflop) with setting input (S), resetting input (R),
output (Q) and inverted output (Q), setting input dominant
Static memory (RS-flipflop) with setting input (S), resetting input (R),
output (Q) and inverted output (Q), resetting input dominant
Preface
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Open Source Software
The product contains, among other things, Open Source Software developed by third parties. The Open
Source Software used in the product and the license agreements concerning this software can be found in the
Readme_OSS. These Open Source Software files are protected by copyright. Your compliance with those
license conditions will entitle you to use the Open Source Software as foreseen in the relevant license. In the
event of conflicts between Siemens license conditions and the Open Source Software license conditions, the
Open Source Software conditions shall prevail with respect to the Open Source Software portions of the soft-
ware. The Open Source Software is licensed royalty-free. Insofar as the applicable Open Source Software
License Conditions provide for it you can order the source code of the Open Source Software from your
Siemens sales contact - against payment of the shipping and handling charges - for a period of at least 3 years
since purchase of the Product. We are liable for the Product including the Open Source Software contained in
it pursuant to the license conditions applicable to the Product. Any liability for the Open Source Software
beyond the program flow intended for the Product is explicitly excluded. Furthermore any liability for defects
resulting from modifications to the Open Source Software by you or third parties is excluded. We do not
provide any technical support for the Product if it has been modified.
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Table of Contents
Preface..........................................................................................................................................................3
Open Source Software..................................................................................................................................9
1 Introduction................................................................................................................................................17
1.1 Overall Operation..............................................................................................................18
1.2 Application Scope............................................................................................................. 20
1.3 Characteristics.................................................................................................................. 22
2 Functions.................................................................................................................................................... 25
2.1 General ............................................................................................................................26
2.1.1 Functional Scope......................................................................................................... 26
2.1.1.1 Configuration of the Scope of Functions ................................................................ 26
2.1.1.2 Setting Notes......................................................................................................... 26
2.1.1.3 Settings................................................................................................................. 27
2.1.2 Device......................................................................................................................... 28
2.1.2.1 Trip-Dependent Indications.................................................................................... 28
2.1.2.2 Setting Notes......................................................................................................... 29
2.1.2.3 Settings................................................................................................................. 30
2.1.2.4 Information List..................................................................................................... 30
2.1.3 Power System Data 1...................................................................................................31
2.1.3.1 Setting Notes......................................................................................................... 32
2.1.3.2 Settings................................................................................................................. 35
2.1.4 Change Group............................................................................................................. 36
2.1.4.1 Purpose of the Setting Groups................................................................................ 36
2.1.4.2 Setting Notes......................................................................................................... 37
2.1.4.3 Settings................................................................................................................. 37
2.1.4.4 Information List..................................................................................................... 37
2.1.5 Power System Data 2...................................................................................................37
2.1.5.1 Setting Notes......................................................................................................... 37
2.1.5.2 Settings................................................................................................................. 39
2.1.5.3 Information List..................................................................................................... 40
2.1.6 Oscillographic Fault Records........................................................................................ 41
2.1.6.1 Functional Description........................................................................................... 41
2.1.6.2 Setting Notes......................................................................................................... 41
2.1.6.3 Settings................................................................................................................. 42
2.1.6.4 Information List..................................................................................................... 42
2.1.7 Ethernet EN100-Module.............................................................................................. 42
2.1.7.1 Functional Description........................................................................................... 42
2.1.7.2 Setting Notes......................................................................................................... 42
2.1.7.3 Information List..................................................................................................... 43
2.2 Automatic reclosure function (optional)............................................................................ 44
2.2.1 Functional Description.................................................................................................44
2.2.2 Setting Notes...............................................................................................................58
2.2.3 Settings.......................................................................................................................64
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2.2.4 Information List...........................................................................................................66
2.3 Overcurrent protection (optional)......................................................................................69
2.3.1 General....................................................................................................................... 69
2.3.2 Functional Description.................................................................................................69
2.3.3 Setting Notes...............................................................................................................75
2.3.4 Settings.......................................................................................................................80
2.3.5 Information List...........................................................................................................81
2.4 Synchronism and voltage check (optional).........................................................................83
2.4.1 Functional Description.................................................................................................83
2.4.2 Setting Notes...............................................................................................................89
2.4.3 Settings.......................................................................................................................94
2.4.4 Information List...........................................................................................................95
2.5 Under and over-voltage protection (optional).................................................................... 97
2.5.1 Overvoltage Protection................................................................................................ 97
2.5.2 Undervoltage protection............................................................................................102
2.5.3 Setting Notes.............................................................................................................107
2.5.4 Settings.....................................................................................................................110
2.5.5 Information List.........................................................................................................112
2.6 Circuit breaker failure protection (optional)..................................................................... 115
2.6.1 Functional Description...............................................................................................115
2.6.2 Setting Notes.............................................................................................................125
2.6.3 Settings.....................................................................................................................128
2.6.4 Information List.........................................................................................................129
2.7 Monitoring Functions......................................................................................................131
2.7.1 Measurement Supervision......................................................................................... 131
2.7.1.1 Hardware Monitoring...........................................................................................131
2.7.1.2 Software Monitoring............................................................................................ 133
2.7.1.3 Monitoring External Transformer Circuits..............................................................133
2.7.1.4 Monitoring the Phase Angle of the Positive Sequence Power.................................138
2.7.1.5 Malfunction Reaction........................................................................................... 140
2.7.1.6 Setting Notes....................................................................................................... 141
2.7.1.7 Settings............................................................................................................... 143
2.7.1.8 Information List................................................................................................... 144
2.7.2 Trip circuit supervision...............................................................................................144
2.7.2.1 Functional Description......................................................................................... 144
2.7.2.2 Setting Notes....................................................................................................... 147
2.7.2.3 Settings............................................................................................................... 147
2.7.2.4 Information List................................................................................................... 147
2.8 Function Control and Circuit Breaker Test ....................................................................... 149
2.8.1 Function Control........................................................................................................149
2.8.1.1 Closure Detection.................................................................................................149
2.8.1.2 Detection of the Circuit Breaker Position............................................................... 151
2.8.1.3 Open Pole Detektor.............................................................................................. 153
2.8.1.4 Pickup Logic of the Entire Device.......................................................................... 155
2.8.1.5 Tripping Logic of the Entire Device....................................................................... 155
2.8.2 Circuit breaker trip test.............................................................................................. 158
2.8.2.1 Function Description............................................................................................ 159
2.8.2.2 Information List................................................................................................... 159
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2.9 Auxiliary Functions..........................................................................................................161
2.9.1 Processing of Messages............................................................................................. 161
2.9.1.1 Functional Description......................................................................................... 161
2.9.2 Statistics....................................................................................................................164
2.9.2.1 Functional Description......................................................................................... 164
2.9.2.2 Setting Notes....................................................................................................... 164
2.9.2.3 Information List................................................................................................... 164
2.9.3 Measurement............................................................................................................ 165
2.9.3.1 Functional Description......................................................................................... 165
2.9.3.2 Information List................................................................................................... 166
2.9.4 Energy.......................................................................................................................167
2.9.4.1 Energy Metering.................................................................................................. 167
2.9.4.2 Setting Notes....................................................................................................... 167
2.9.4.3 Information List................................................................................................... 167
2.10 Command Processing......................................................................................................169
2.10.1 Control Authorization................................................................................................ 169
2.10.1.1 Type of Commands.............................................................................................. 169
2.10.1.2 Sequence in the Command Path...........................................................................169
2.10.1.3 Interlocking......................................................................................................... 170
2.10.1.4 Information List................................................................................................... 173
2.10.2 Control Device...........................................................................................................173
2.10.2.1 Functional Description......................................................................................... 173
2.10.2.2 Information List................................................................................................... 174
2.10.3 Process Data..............................................................................................................174
2.10.3.1 Functional Description......................................................................................... 174
2.10.3.2 Information List................................................................................................... 175
2.10.4 Protocol.....................................................................................................................175
2.10.4.1 Information List................................................................................................... 175
3 Mounting and Commissioning................................................................................................................. 177
3.1 Mounting and Connections............................................................................................. 178
3.1.1 Configuration Information......................................................................................... 178
3.1.2 Hardware Modifications.............................................................................................182
3.1.2.1 General................................................................................................................182
3.1.2.2 Disassembly......................................................................................................... 183
3.1.2.3 Switching Elements on Printed Circuit Boards....................................................... 186
3.1.2.4 Interface Modules................................................................................................ 195
3.1.2.5 Reassembly..........................................................................................................199
3.1.3 Mounting.................................................................................................................. 199
3.1.3.1 Panel Flush Mounting...........................................................................................199
3.1.3.2 Rack and Cubicle Mounting.................................................................................. 200
3.1.3.3 Panel Mounting....................................................................................................202
3.2 Checking Connections.....................................................................................................203
3.2.1 Checking Data Connections of Serial Interfaces.......................................................... 203
3.2.2 Checking the System Connections............................................................................. 205
3.3 Commissioning............................................................................................................... 208
3.3.1 Test Mode/Transmission Block................................................................................... 209
3.3.2 Checking the Time Synchronisation Interface............................................................. 209
3.3.3 Test system interface.................................................................................................209
3.3.4 Checking the switching states of the binary Inputs/Outputs........................................211
3.3.5 Checking for Breaker Failure Protection......................................................................213
3.3.6 Current, Voltage, and Phase Rotation Testing............................................................. 215
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3.3.7 Directional Check with Load Current.......................................................................... 216
3.3.8 Polarity Check for the Voltage Input U4.......................................................................217
3.3.9 Polarity Check for the Current Input Ι4 ....................................................................... 219
3.3.10 Measuring the Operating Time of the Circuit Breaker..................................................219
3.3.11 Check of the Signal Transmission for Breaker Failure Protection and/or End Fault
Protection................................................................................................................. 220
3.3.12 Testing User-defined Functions..................................................................................220
3.3.13 Trip and Close Test with the Circuit Breaker................................................................220
3.3.14 Switching Test of the Configured Operating Equipment............................................. 221
3.3.15 Triggering Oscillographic Recording for Test...............................................................221
3.4 Final Preparation of the Device........................................................................................223
4 Technical Data.......................................................................................................................................... 225
4.1 General...........................................................................................................................226
4.1.1 Analogue Inputs and Outputs.................................................................................... 226
4.1.2 Auxiliary Voltage....................................................................................................... 226
4.1.3 Binary Inputs and Outputs......................................................................................... 227
4.1.4 Communication Interfaces.........................................................................................228
4.1.5 Electrical Tests...........................................................................................................231
4.1.6 Mechanical Tests....................................................................................................... 233
4.1.7 Climatic Stress Tests.................................................................................................. 233
4.1.8 Deployment Conditions............................................................................................. 234
4.1.9 Construction..............................................................................................................234
4.2 Automatic reclosure function (optional).......................................................................... 235
4.3 Overcurrent protection (optional)....................................................................................236
4.4 Synchronism and voltage check (optional).......................................................................243
4.5 Under and over-voltage protection (optional).................................................................. 244
4.6 Circuit breaker failure protection (optional)..................................................................... 247
4.7 Monitoring Functions......................................................................................................248
4.8 User-defined Functions (CFC).......................................................................................... 250
4.9 Auxiliary Functions..........................................................................................................254
4.10 Dimensions.....................................................................................................................256
4.10.1 Panel Flush Mounting or Cubicle Mounting (housing size 1/3)..................................... 256
4.10.2 Panel Flush Mounting or Cubicle Mounting (housing size 1/2) .....................................257
4.10.3 Panel surface mounting (housing size 1/3).................................................................. 258
4.10.4 Panel surface mounting (housing size 1/2).................................................................. 258
A Ordering Information and Accessories.....................................................................................................259
A.1 Ordering information MLFB ordering code.......................................................................260
A.2 Accessories..................................................................................................................... 262
B Terminal Assignments..............................................................................................................................265
B.1 Housing for Panel Flush or Cubicle Mounting .................................................................. 266
B.2 Housing for Panel Surface Mounting................................................................................268
C Connection Examples............................................................................................................................... 271
C.1 Current Transformer Connection Examples......................................................................272
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C.2 Voltage Transformer Connection Examples......................................................................273
D Default Settings and Protocol-dependent Functions............................................................................... 277
D.1 LEDs............................................................................................................................... 278
D.2 Binary input default settings............................................................................................279
D.3 Binary output default settings......................................................................................... 280
D.4 Function key default settings...........................................................................................281
D.5 Default Display................................................................................................................282
D.6 Pre-defined CFC Charts....................................................................................................283
D.7 Protocol-dependent Functions.........................................................................................284
E Functions, Settings, Information..............................................................................................................285
E.1 Functional Scope............................................................................................................ 286
E.2 Settings.......................................................................................................................... 287
E.3 Information List ..............................................................................................................308
E.4 Group Indications............................................................................................................342
E.5 Measured Values.............................................................................................................343
Literature.................................................................................................................................................. 345
Glossary.................................................................................................................................................... 347
Index.........................................................................................................................................................357
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Introduction
The SIPROTEC 4 device 7VK61 is introduced in this chapter. The device is presented in its application, charac-
teristics, and functional scope.
1.1 Overall Operation 18
1.2 Application Scope 20
1.3 Characteristics 22
1
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Overall Operation
The digital breaker management relay SIPROTEC 4 7VK61 is equipped with a powerful microprocessor system.
All tasks are processed fully digitally, from the acquisition of measured values up to sending commands to the
circuit breakers. Figure 1-1 shows the basic structure of the 7VK61.
Analog Inputs
The measuring inputs (MI) transform the currents and voltages from the instrument transformers and match
them to the internal signal levels for processing in the device. The device has 4 current inputs and 4 voltage
inputs. Three current inputs are provided for measuring the phase currents, a further measuring input (Ι4) can
be configured to detect the earth current (CT starpoint) or a separate earth current transformer. The analog
input quantities are passed on to the input amplifiers (IA).
[hw-struktur-7vk61-oz-251102, 1, en_GB]
Figure 1-1 Hardware-Struktur des Breaker Management Devicees 7VK61
A voltage measuring input is provided for each phase-earth voltage. A further voltage input (U4) may be
selected to measure either the displacement voltage, or the additional voltage for synchronism and voltage
check or for any other voltage UX (for overvoltage protection). The analogue values are transferred to the IA
input amplifier group.
The input amplifier group IA provides high-resistance termination for the analog input quantities. It consists of
filters that are optimized for measured value processing with regard to bandwidth and processing speed.
The AD analog-to-digital converter group contains analog/digital converters and memory chips for data
transfer to the microcomputer system.
1.1
Introduction
1.1 Overall Operation
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Microcomputer System
Apart from processing the measured values, the microcomputer system µC also executes the actual protection
and control functions. This especially includes:
•Filtering and conditioning of the measured signals
•Continuous monitoring of the measured quantities
•Monitoring of the pickup conditions for the individual protection functions
•Monitoring of limit values and time sequences
•Control of signals for logical functions
•Reaching trip and close command decisions
•Recording of messages, fault data and fault values for analysis
•Administration of the operating system and its functions, e.g. data storage, realtime clock, communica-
tion, interfaces, etc.
The information is provided via output amplifier OA.
Binary Inputs and Outputs
Binary inputs from and outputs to the computer system are routed via the I/O modules (inputs and outputs).
The computer system obtains information from the system (e.g remote resetting) or from the external equip-
ment (e.g. blocking commands). Outputs are commands that are issued to the switching devices and
messages for remote signaling of important events and states.
Front Elements
LEDs and an LC display provide information on the function of the device and indicate events, states and
measured values.
Integrated control and numeric keys in conjunction with the LCD facilitate local communication with the
device. Thus, all information of the device, e.g. configuration and setting parameters, operating and fault
messages, and measured values can be retrieved or changed (see also chapter 2 and SIPROTEC 4 System
Description).
Serial Interfaces
The serial operator interface in the front cover enables communication with a personal computer when using
the DIGSI operating program. This allows all device functions to be handled conveniently.
The serial service interface can also be used for communication with a personal computer using DIGSI. This
port is especially well suited for a permanent connection of the devices to the PC or for operation via a
modem.
All device data can be transmitted to a control center through the serial system interface. Various protocols
and physical arrangements are available for this interface to suit a particular application.
An additional interface is provided for time synchronization of the internal clock through external synchroniza-
tion sources.
Further communication protocols can be realized via additional interface modules.
Power Supply
The functional units described are powered by a power supply, PS, with adequate power in the different
voltage levels. Brief supply voltage dips which may occur during short circuits in the auxiliary voltage supply of
the substation, are usually bridged by a capacitor (see also Technical Data, Section 4.1 General).
Introduction
1.1 Overall Operation
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Application Scope
The 7VK61 breaker management relay is a multi-purpose starting and control device for automatic and
manual closing of circuit breakers in electrical networks of all voltage levels.
The automatic reclose function may be used on overhead lines for single-pole, three-pole or single- and three-
pole automatic reclosure as well as multi-shot automatic reclosure. The adaptive dead times can be set individ-
ually for single-pole, three-pole auto-reclosure and for additional (up to 8) reclose cycles.
Before reclosure after three-pole tripping, the validity of the reclosure can be checked by synchronism check
by the device (can be ordered optionally). Alternatively, the de-energization of the line or of the busbar can be
checked. If desired, asynchronous energization is also possible. In this case, the device calculates the moment
of the energization command so that the two voltages at busbar and feeder are in phase the instant the
circuit-breaker poles make contact.
The circuit breaker must be suitable for auto-reclosing. For single-pole auto-reclosure the poles must be indi-
vidually controllable. The device considers whether the circuit breaker is ready for a trip and close cycle and its
position - provided this information is supplied by the circuit breaker. The breaker recovery time can be moni-
tored. During single-pole auto-reclosure the relay can either process the parallel connection or the series
connection or both connections of the auxiliary contacts at the circuit breaker poles. The relay is furthermore
capable of processing the auxiliary contact of each pole. But generally the relay can operate without such
information from the circuit breaker.
7VK61 can work together with static and digital protection equipment requiring only pickup and trip opera-
tions from them. For single-pole auto-reclosure the trip signals must either be distinguished as to whether
they are single-pole or three pole or they must be transmitted to the relay for each pole separately. In the
event of three-pole auto-reclosure alone a general trip signal is sufficient.
Protective Functions
The 7VK61 features the following basic functions:
•Auto-Reclose function
•Synchronism and Voltage Check
•Circuit Breaker Failure Protection
•Under/Overvoltage Protection
•Backup overcurrent
Control Functions
The device is equipped with control functions which operate, close and open, switchgear devices via control
keys, the system interface, binary inputs and a PC with DIGSI software. The status of the primary equipment
can be transmitted to the device via auxiliary contacts connected to binary inputs. The present status (or posi-
tion) of the primary equipment can be displayed on the device, and used for interlocking or plausibility moni-
toring. The number of the devices to be switched is limited by the binary inputs and outputs available in the
device or the binary inputs and outputs allocated for the switch position feedbacks. Depending on the mode
of operation, one binary input (single point indication) or two binary inputs (double point indication) can be
used. The capability of switching primary equipment can be restricted by appropriate settings for the
switching authority (remote or local), and by the operating mode (interlocked/non-interlocked, with or
without password validation). Interlocking conditions for switching (e.g. switchgear interlocking) can be
established using the integrated userdefined logic.
Indications and Measured Values; Fault Recording
The operational indications provide information about conditions in the power system and the device. Meas-
urement quantities and values that are calculated can be displayed locally and communicated via the serial
interfaces.
Device messages can be assigned to a number of LEDs on the front panel (programmable), can be externally
processed via output contacts (programmable), linked with user-definable logic functions and/or issued via
serial interfaces (see Communication below).
1.2
Introduction
1.2 Application Scope
20 SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018