Siemens Siprotec 7VK61 User manual

SIPROTEC
Breaker Management
Device
7VK61
V4.60
Manual
C53000-G1176-C159-3
Preface
Contents
Introduction 1
Functions 2
Mounting and Commissioning 3
Technical Data 4
Appendix A
Literature
Glossary
Index

Siemens Aktiengesellschaft Order no.: C53000-G1176-C159-3
Note
For safety purposes, please note instructions and warnings in the Preface.
Disclaimer of liability
We have checked the text of this manual against the hardware and
software described. However, deviations from the description
cannot be completely ruled out, so that no liability can be accepted
for any errors or omissions contained in the information given.
The information given in this document is reviewed regularly and
any necessary corrections will be included in subsequent editions.
We appreciate any suggestions for improvement.
We reserve the right to make technical improvements without
notice.
Document Version 4.11.00
Release date 05.2009
Copyright
Copyright © Siemens AG 2009. All rights reserved.
Dissemination or reproduction of this document, or evaluation and
communication of its contents, is not authorized except where ex-
pressly permitted. Violations are liable for damages. All rights re-
served, particularly for the purposes of patent application or trade-
mark registration.
Registered Trademarks
SIPROTEC,SINAUT,SICAMandDIGSIareregisteredtrademarks
of Siemens AG. Other designations in this manual might be trade-
marks whose use by third parties for their own purposes would in-
fringe the rights of the owner.

SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009 3
Preface
Purpose of this Manual
Thismanualdescribesthe functions,operation,installation, andcommissioningof devices7VK61.Inparticular,
one will find:
• Information regarding the configuration of the scope of the device and a description of the device functions
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 A.
General information with regard to design, configuration, and operation of SIPROTEC 4 devices are set out in
the SIPROTEC 4 System Description /1/.
Target Audience
Protection engineers, commissioning engineers, personnel concerned with adjustment, checking, and service
of selective protective equipment, automatic and control facilities, and personnel of electrical facilities and
power plants.
Applicability of this Manual
This manual applies to: SIPROTEC 4 Breaker Management Device 7VK61; firmware version V4.60.
Conformity Declaration
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 89/336/EEC) and concerning electrical equipment for use within specified
voltage limits (Low-voltage Directive 73/23 EEC).
This conformity has been established by means of tests conducted by Siemens AG in accor-
dance with Article 10 of the Council Directive in agreement with the generic standards EN
61000-6-2 and EN 61000-6-4 for the EMC directive, and with the standard EN 60255-6 for the
low-voltage directive.
The device has been designed and produced for industrial use.
The product conforms with the international standards of the series IEC 60255 and the German
standard VDE 0435.
Additional Standards IEEE Std C37.90-*

Preface
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
4
Additional Support
Should further information on the System SIPROTEC 4 be desired or should particular problems arise which
are not covered sufficiently for the purchaser's purpose, the matter should be referred to the local Siemens rep-
resentative.
Our Customer Support Center provides a 24-hour service.
Phone: [phone]
Fax: [phone]
e-mail: [email protected]
Training Courses
Enquiries regarding individual training courses should be addressed to our Training Center:
Siemens AG
Power Transmission and Distribution
Siemens Power Academy TD
Humboldt Street 59
90459 Nuremberg
Telephone: [phone]
Fax: [phone]
Internet: www.ptd-training.de
Safety Information
This manual does not constitute a complete index of all required safety measures for operation of the equip-
ment (module, device), as special operational conditions may require additional measures. However, it com-
prises important information that should be noted for purposes of personal safety as well as avoiding material
damage. Information that is highlighted by means of a warning triangle and according to the degree of danger,
is illustrated as follows.
DANGER!
Danger indicates that death, severe personal injury or substantial material damage will result if proper precau-
tions are not taken.
WARNING!
indicates that death, severe personal injury or substantial property damage may result if proper precautions are
not taken.
Caution!
indicates that minor personal injury or property damage may result if proper precautions are not taken. This
particularly applies to damage to or within the device itself and consequential damage thereof.

Preface
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009 5
Note
indicates information on the device, handling of the device, or the respective part of the instruction manual
which is important to be noted.
WARNING!
Qualified Personnel
Commissioning and operation of the equipment (module, device) as set out in this manual may only be carried
out by qualified personnel. Qualified personnel in terms of the technical safety information as set out in this
manual are persons who are authorized to commission, activate, to ground and to designate devices, systems
and electrical circuits in accordance with the safety standards.
Use as prescribed
The operational equipment (device, module) may only be used for such applications as set out in the catalogue
and the technical description, and only in combination with third-party equipment recommended or approved
by Siemens.
The successful and safe operation of the device is dependent on proper handling, storage, installation, opera-
tion, and maintenance.
When operating an electrical equipment, certain parts of the device are inevitably subject to dangerous voltage.
Severe personal injury or property damage may result if the device is not handled properly.
Before any connections are made, the device must be grounded to the ground terminal.
All circuit components connected to the voltage supply may be subject to dangerous voltage.
Dangerous voltage may be present in the device even after the power supply voltage has been removed (ca-
pacitors can still be charged).
Operational equipment with open circuited current transformer circuits may not be operated.
The limit values as specified in this manual or in the operating instructions may not be exceeded. This aspect
must also be observed during testing and commissioning.

Preface
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
6
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 the titles of menus.
1234A
Parameter addresses have the same character style as parameter names. Parameter addresses contain the
suffix Ain the overview tables if the parameter can only be set in DIGSI via the option Display additional set-
tings.
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.
„Messages“
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

Preface
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009 7
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 values
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 nega-
tive 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)
Timer (dropout delay T, example non-adjustable)
Dynamic triggered pulse timer T (monoflop)
Static memory (RS-flipflop) with setting input (S), resetting input (R),
output (Q) and inverted output (Q)

Preface
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
8

SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009 9
Contents
1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
1.1 Overall Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
1.2 Application Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
1.3 Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
2 Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
2.1.1 Functional Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
2.1.1.1 Configuration of the Scope of Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
2.1.1.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
2.1.1.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
2.1.2 Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
2.1.2.1 Trip-Dependent Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
2.1.2.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
2.1.2.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
2.1.2.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
2.1.3 Power System Data 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
2.1.3.1 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
2.1.3.2 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
2.1.4 Change Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
2.1.4.1 Purpose of the Setting Groups. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
2.1.4.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
2.1.4.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
2.1.4.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
2.1.5 Power System Data 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
2.1.5.1 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
2.1.5.2 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
2.1.5.3 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
2.1.6 Oscillographic Fault Records. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
2.1.6.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
2.1.6.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
2.1.6.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
2.1.6.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
2.1.7 Ethernet EN100-Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
2.1.7.1 Function Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
2.1.7.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
2.1.7.3 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
2.2 Automatic reclosure function (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
2.2.1 Function Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
2.2.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
2.2.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
2.2.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

Contents
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
10
2.3 Overcurrent protection (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
2.3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
2.3.2 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
2.3.3 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
2.3.4 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
2.3.5 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
2.4 Synchronism and voltage check (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
2.4.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
2.4.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
2.4.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
2.4.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
2.5 Under and over-voltage protection (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
2.5.1 Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
2.5.2 Undervoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102
2.5.3 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106
2.5.4 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109
2.5.5 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
2.6 Circuit breaker failure protection (optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
2.6.1 Method of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
2.6.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126
2.6.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129
2.6.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
2.7 Monitoring Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
2.7.1.6 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .143
2.7.1.7 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
2.7.1.8 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
2.7.2 Trip circuit supervision. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
2.7.2.1 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
2.7.2.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
2.7.2.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
2.7.2.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
2.8 Function Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150
2.8.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150
2.8.1.1 Line energisation recognition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150
2.8.1.2 Detection of the Circuit Breaker Position. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152
2.8.1.3 Open Pole Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
2.8.1.4 Pickup Logic of the Entire Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156
2.8.1.5 Tripping Logic of the Entire Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .157
2.8.1.6 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161
2.8.2 Circuit breaker trip test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161
2.8.2.1 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
2.8.2.2 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Contents
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009 11
2.9 Auxiliary Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163
2.9.1 Message Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163
2.9.1.1 Method of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163
2.9.2 Statistics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .166
2.9.2.1 Function Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .166
2.9.2.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .167
2.9.2.3 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .167
2.9.3 Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .167
2.9.3.1 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .167
2.9.3.2 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .169
2.9.4 Energy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .170
2.9.4.1 Energy Metering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .170
2.9.4.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .170
2.9.4.3 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .170
2.10 Command Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171
2.10.1 Control Authorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171
2.10.1.1 Type of Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .171
2.10.1.2 Sequence in the Command Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172
2.10.1.3 Interlocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .173
2.10.1.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175
2.10.2 Control Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175
2.10.2.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .176
2.10.2.2 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .176
2.10.3 Process Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177
2.10.3.1 Method of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177
2.10.3.2 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .178
2.10.4 Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .178
2.10.4.1 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .178
3 Mounting and Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .179
3.1 Mounting and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180
3.1.1 Configuration Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180
3.1.2 Hardware Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .184
3.1.2.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .184
3.1.2.2 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186
3.1.2.3 Switching Elements on Printed Circuit Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .188
3.1.2.4 Interface Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .199
3.1.2.5 Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .202
3.1.3 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .203
3.1.3.1 Panel Flush Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .203
3.1.3.2 Rack and Cubicle Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204
3.1.3.3 Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206
3.2 Checking Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207
3.2.1 Checking Data Connections of Serial Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207
3.2.2 Checking the System Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .210

Contents
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
12
3.3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
3.3.1 Test Mode / Transmission Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
3.3.2 Test Time Synchronisation Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
3.3.3 Testing the System Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
3.3.4 Checking the switching states of the binary Inputs/Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
3.3.5 Checking for Breaker Failure Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
3.3.6 Current, Voltage, and Phase Rotation Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
3.3.7 Directional Check with Load Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
3.3.8 Polarity Check for the Voltage Input U4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222
3.3.9 Polarity check for the current input I4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224
3.3.10 Measuring the Operating Time of the Circuit Breaker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
3.3.11 Check of the Signal Transmission for Breaker Failure Protection and/or End Fault Protection . .225
3.3.12 Testing User-defined Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225
3.3.13 Trip and Close Test with the Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
3.3.14 Switching Test of the Configured Operating Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .226
3.3.15 Triggering Oscillographic Recording for Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
3.4 Final Preparation of the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
4 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .230
4.1.1 Analogue Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
4.1.2 Auxiliary voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .230
4.1.3 Binary Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
4.1.4 Communication Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
4.1.5 Electrical Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
4.1.6 Mechanical Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .237
4.1.7 Climatic Stress Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
4.1.8 Deployment Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
4.1.9 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .239
4.2 Automatic Reclosure (optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
4.3 Time Overcurrent Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .241
4.4 Synchronism and Voltage Check (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248
4.5 Voltage Protection (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .250
4.6 Circuit Breaker Failure Protection (optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253
4.7 Monitoring Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254
4.8 User Defined Functions (CFC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
4.9 Auxiliary Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .260
4.10 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .262
4.10.1 Panel Flush Mounting or Cubicle Mounting (housing size 1/3) . . . . . . . . . . . . . . . . . . . . . . . . . . .262
4.10.2 Panel flush mounting or cubicle installation (housing size 1/2) . . . . . . . . . . . . . . . . . . . .263
4.10.3 Panel surface mounting (housing size 1/3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
4.10.4 Panel surface mounting (housing size 1/2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

Contents
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009 13
A Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .265
A.1 Ordering Information and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .266
A.1.1 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .266
A.1.1.1 Ordering Code (MLFB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .266
A.1.2 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .268
A.2 Terminal Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .271
A.2.1 Housing for Panel Flush or Cubicle Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .271
A.2.2 Housing for Panel Surface Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .273
A.3 Connection Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .275
A.3.1 Current Transformer Connection Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .275
A.3.2 Voltage Transformer Connection Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .276
A.4 Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .279
A.4.1 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .279
A.4.2 Binary Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .279
A.4.3 Binary Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .281
A.4.4 Function Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .281
A.4.5 Default Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .282
A.4.6 Pre-defined CFC Charts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .283
A.5 Protocol-dependent Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .284
A.6 Functional Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .285
A.7 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .286
A.8 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .294
A.9 Group Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .312
A.10 Measured Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .313
Literature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .315
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .317
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .329

Contents
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
14

SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009 15
Introduction 1
The SIPROTEC 4 7VK61 is introduced in this chapter. The device is presented in its application, characteris-
tics, and functional scope.
1.1 Overall Operation 16
1.2 Application Scope 18
1.3 Characteristics 20

Introduction
1.1 Overall Operation
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
16
1.1 Overall Operation
The digital breaker management relay SIPROTEC 4 7VK61 is equipped with a powerful microprocessor
system.Alltasksareprocessed fullydigitally,fromthe acquisition ofmeasured valuesup tosendingcommands
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 (I4) 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).
Figure 1-1 Hardware structure of the Breaker Management Device 7VK61
A voltage measuring input is provided for each phase-earth voltage. A further voltage input (U4) may be select-
ed to measure either the displacement voltage, for the additional voltage of synchronism and voltage check or
for any other voltage UX(for overvoltage protection). The analogue values are transferred to the IA input am-
plifier 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.

Introduction
1.1 Overall Operation
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009 17
The AD analog-to-digital converter group contains analog/digital converters and memory chips for data transfer
to the microcomputer system.
Microcomputer System
Apart from processing the measured values, the microcomputer system µC also executes the actual protection
and control functions. They especially consist of:
• Filtering and conditioning of the measured signals
• Continuous monitoring of the measured quantities
• Monitoring of the pickup conditions for the individual protective functions
• Querying of limit values and time sequences
• Control of signals for logical functions
• Reaching trip and close command decisions
• Stocking messages, fault data and fault values for fault analysis purposes
• Administration of the operating system and its functions, e.g. data storage, realtime clock, communication,
interfaces, etc.
The information is provided via output amplifier OA.
Binary Inputs and Outputs
Binaryinputsandoutputs fromand tothe computer systemarerouted viathe I/Omodules (inputsand outputs).
The “µC” issues information to external equipment via the output contacts. Outputs are mainly commands that
are issued to the switching devices and messages for remote signalling of events and states.
Front Elements
LEDs and an LC display provide information on the function of the device and indicate events, states and mea-
sured values.
Integrated control and numeric keys in conjunction with the LCD facilitate local interaction with the local device.
All information of the device can be accessed using the integrated control and numeric keys. This information
includes protective and control settings, operating and fault indications, and measured values; setting param-
eters can be changed (see also Chapter 2 and SIPROTEC 4 System Description).
Serial Interfaces
Via the serial operator interface in the front panel the communication with a personal computer using the oper-
ating program DIGSI is possible. This facilitates a comfortable handling of all device functions.
The service interface can also be used for communication with a personal computer using DIGSI. This is es-
pecially well suited for the central interrogation of the devices from a PC or for remote operation via a modem.
All device data can be transmitted to a central evaluating unit or control center through the serial system
(SCADA) interface. This interface may be provided with various physical transmission modes and different pro-
tocols to suit the particular application.
A further interface is provided for time synchronization of the internal clock through external synchronization
sources.
Further communication protocols can be realized via additional interface modules.
Power Supply
These described functional units are supplied by a power supply PS with the necessary power in the different
voltage levels. Brief supply voltage dips which may occur on short circuits in the auxiliary voltage supply of the
power system are usually bridged by a capacitor (see also Technical Data, Subsection 4.1).

Introduction
1.2 Application Scope
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
18
1.2 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 indi-
vidually 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 andclose 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 con-
nection 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 in-
formation from the circuit breaker.
7VK61 can work together with static and digital protection equipment requiring only pickup and trip operations
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:
• Automatic Reclosure Function
• Synchronism and Voltage Check
• Circuit Breaker Failure Protection
• Voltage Protection
• Time Overcurrent Protection
Control Functions
The device is equipped with control functions which operate, close and open, switchgear via function keys, the
system interface, binary inputs and from a PC with the 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 monitor-
ing. 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 primary equip-
ment being controlled, one binary input (single point indication) or two binary inputs (double point indication)
may be used for this process. The switching of primary equipment can be restricted by corresponding settings
of the switching authority (Remote or Local), and by the operating mode (interlocked/non-interlocked, with or
without password request). Interlocking conditions for switching (e.g. switchgear interlocking) can be estab-
lished using the integrated user-defined logic.

Introduction
1.2 Application Scope
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009 19
Indications and Measured Values; Fault Recording
The operational indications provide information about conditions in the power system and the device. Measure-
ment quantities and values that are calculated can be displayed locally and communicated via the serial inter-
faces.
Indications can be assigned to a number of LEDs on the front panel (allocatable), can be externally processed
via output contacts (allocatable), linked with user-definable logic functions and/or issued via serial interfaces
(see Communication below).
During a fault (power system fault) important events and changes in conditions are saved in fault logs (Event
Log or Trip Log). Instantaneous fault values are also saved in the device and may be analyzed subsequently.
Communication
Serial interfaces are available for the communication with operating, control and memory systems.
A 9-pin DSUB socket on the front panel is used for local communication with a PC. The SIPROTEC 4 operating
software DIGSI allows users to carry out all operational and evaluation tasks via this operator interface, such
as specifying and modifying configuration parameters and settings, configuring user-specific logic functions,
retrieving operational messages and measured values, inquiring device conditions and measured values,
issuing control commands.
To establish an extensive communication with other digital operating, control and memory components the
device may be provided with further interfaces depending on the order variant.
The service interface can be operated via the RS232 or RS485 interface and also allows communication via
modem. For this reason, remote operation is possible via PC and the DIGSI operating software, e.g. to operate
several devices via a central PC.
The system interface ensures the central communication between the device and the substation controller. It
can be operated through the RS232, the RS485 or the fibre optic interface. Several standardized protocols are
available for data transmission. An EN 100 module allows to integrate the devices into 100 Mbit Ethernet com-
munication networks used by process control and automation systems and running IEC 61850 protocols. In
parallel to the process control integration of the device, this interface can also be used for communication with
DIGSI and for inter-relay communication via GOOSE.
Another interface is provided for the time synchronization of the internal clock via external synchronization
sources (IRIG-B or DCF77).

Introduction
1.3 Characteristics
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
20
1.3 Characteristics
General Features
• Powerful 32-bit microprocessor system
• complete numerical processing of measured values and control, from sampling and digitalising of the ana-
logue input values up to tripping commands to the circuit breakers
• complete galvanic and reliable separation between the internal processing circuits from the measurement,
control, and power supply circuits by analogue input transducers, binary inputs and outputs and the DC/DC
or AC voltage converters
• simple device operation using the integrated operator panel or a connected personal computerwith operator
guidance
• simple device operation using the integrated operator panel or a connected personal computerwith operator
guidance
Automatic Reclosure Function (optional)
• For reclosure after single-pole, three-pole or single-pole and three-pole tripping
• Single or multiple reclosure (up to 8 reclosure attempts)
• With separate action times for every reclosure attempt, optionally without action times
• With separate dead times after single-pole and three-pole tripping, separate for the first four reclosure at-
tempts
• Controlled optionally by production pickup with separate dead times after single, two-pole and three-pole
pickup
• Optionally with adaptive dead time, reduced dead time and dead line check
Synchronism and Voltage Check (optional)
• Verification on the synchronous conditions before reclosing after three-pole tripping
• Fast measuring of voltage difference Udiff, on the phase angle difference ϕdiff and frequency difference fdiff
• Alternatively, check of the de-energized state before reclosing
• Closing at asynchronous system conditions with prediction of the synchronization time
• Settable minimum and maximum voltage
• Verification of the synchronous conditions or de-energized state also possible before the manual closing of
the circuit breaker, with separate limit values
• Phase angle compensation for voltage measurement behind a transformer
• Measuring voltages optionally phase-pase or phase-earth
Time overcurrent protection (optional, available with breaker failure protection)
• Two definite time stages (DT) and one inverse time stage (IDMT), each for phase currents and earth current
• For inverse time overcurrent protection a selection from various characteristics based on several standards
is possible
• Blocking capability e.g. for reverse interlocking with any element
• Instantaneous tripping by any stage when switching onto a fault