Siemens siprotec 7SA6 User manual

C53000-G1176-C156-2
SIPROTEC
Distance Protection
7SA6
V4.2
Manual
Preface
Table of Contents
Introduction 1
Hardware and Connections 2
Initial Inspections 3
SIPROTEC®4Devices 4
Configuration 5
Functions 6
Control During Operation 7
Installation and Commissioning 8
Routine Checks and Maintenance 9
Technical Data 10
Appendix A
Appendix B

Siemens Aktiengesellschaft Book-No. C53000-G1176-C156-2

iii7SA6 Manual
C53000-G1176-C156-2
Preface
Aim of This Manual This manual describes the functions, operation, installation, and commissioning of the
device. In particularly, you will find:
•General information regarding operation of SIPROTEC®4 devices →Chapter 4,
•Information regarding configuration of the device →Chapter 5,
•Description of the device functions and setting facilities →Chapter 6,
•Instruction of operation while in service →Chapter 7,
•Instruction for mounting and commissioning →Chapter 8,
•List of the technical data →Chapter 10.
As well as a compilation of the most significant data for experienced users in the Ap-
pendix.
Target Audience Protection engineers, commissioning engineers, persons who are involved in setting,
testing andserviceof protection, automation, andcontrol devices, aswellasoperation
personnel in electrical plants and power stations.
Applicability of this
Manual This manual is valid for SIPROTEC®7SA6 Distance Protection; firmware version 4.2.
Additional support Should further information 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 representative.
Courses Individual course offerings may be found in our Training Catalog, or questions can be
directed to our training center. Please contact your Siemens representative.
Indication of Conformity
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 equip-
ment for use within specified voltage limits (Low-voltage Directive 73/23/EEC).
This conformity has been proved by tests conducted by Siemens AG in accordance
with Article 10 of the Council Directive in agreement with the generic standards
EN 50081 and EN 50082 (for EMC directive) and the standards EN 60255-6 (for low-
voltage directive).
The conforms with the international standards of IEC 60255 and the German stand-
ards DIN 57435 part 303 (corresponding to VDE 0435 part 303).

Preface
iv 7SA6 Manual
C53000-G1176-C156-2
Instructions and
Warnings The warnings and notes contained in this manual serve for your own safety and for an appropriate lifetime of the device. Please observe them!
The following terms are used:
DANGER
indicates that death, severe personal injury or substantial property damage will result
if proper precautions are not taken.
Warning
indicates that death, severe personal injury or substantial property damage can result
if proper precautions are not taken.
Caution
indicates that minor personal injury or property damage can result if proper precau-
tions are not taken. This is especially valid for damage on or in the device itself and
consequential damage thereof.
Note
indicates information about the device or respective part of the instruction manual
which is essential to highlight.
QUALIFIED PERSONNEL
For the purpose of this instruction manual and product labels, a qualified person is one
who is familiar with the installation, construction and operation of the equipment and
the hazards involved. In addition, he has the following qualifications:
•Is trained and authorized to energize, de-energize, clear, ground and tag circuits
and equipment in accordance with established safety practices.
•Is trained in the proper care and use of protective equipment in accordance with es-
tablished safety practices.
•Is trained in rendering first aid.
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, i.e. 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
Warning!
Hazardous voltages are present in this electrical equipment during operation. Non–
observance of the safety rules can result in severe personal injury or property dam-
age.
Only qualified personnel shall work on and around this equipment after becoming thor-
oughly familiar with all warnings and safety notices of this manual as well as with the
applicable safety regulations.
The successful and safe operation of this device is dependent on proper handling, in-
stallation, operation, and maintenance by qualified personnel under observance of all
warnings and hints contained in this manual.
In particular the general erection and safety regulations (e.g. IEC, DIN, VDE, EN or
other national and international standards) regarding the correct use of hoisting gear
must be observed. Non–observance can result in death, personal injury or substantial
property damage.

Preface
v
7SA6 Manual
C53000-G1176-C156-2
computer (with operation software DIGSI®4), are marked in bold letters of a mono-
space type style.
Parameter options, i.e. 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®4), are written in italic style, additionally.
“Annunciations”, i.e. 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 quotes.
Deviations maybe permitted indrawingswhenthe typeof designatorcan be obviously
derived from the illustration.
The following symbols are used in drawings:
Furthermore, the graphic symbols according IEC 617–12 IEC 617–13 or similar are
used in most cases.
and the possible settings On and Off
UL1–L2
Earth fault device-internal logical input signal
Earth fault device-internal logical output signal
internal input signal of an analog value
>Release external binary input signal
Dev. Trip
external binary output signal
On
Off
1234 FUNCTION
Parameter address
Parameter name
Parameter options
example of a parameter switch FUNCTION with the address 1234
Analog input value
≥1
&
OR–Logic of input value
AND–Logic of input value
Inversion of Signal

Preface
vi 7SA6 Manual
C53000-G1176-C156-2
Iph>
2610 Iph>>
0T
S
R
Q
Dynamic input signals
Creation of an analog output signal
out of several analog input signals
Timing element (resetting time delay)
Monitoring stage with
parameter address and parameter name
TTransition-operated timing element
Static memory (RS–flipflop) with Set
=1 Exclusive OR (Non-equivalence): output active, if
only one of the inputs is active
=Coincidence: output active, if both inputs
are active in the same direction
0T
2611 T Iph>>
Timing element (pickup delay) with
Input (S), Reset Input (R), Output (Q)
and Negated Output (Q)
Q
with action time T
parameter address and parameter name
Copyright
Copyright © SIEMENS AG 2000; 2002. All rights reserved.
Copying of this document and giving it to others and the use or
communication of the contents thereof, are forbidden without ex-
pressauthority.Offenders are liabletothepayment ofdamages. All
rights are reserved, especially in the event or grant of a patent or
registration of a utility model or design.
Registered trademarks
SIPROTEC, SINAUT, SICAM, and DIGSI are registered trade-
marks of SIEMENS AG. Other names and terms can be trade-
marks the use of which may violate the rights of thirds.
Liability statement
We have checked the contents of this manual against the de-
scribed hardware and software. Nevertheless, deviations may oc-
cur so that we cannot guarantee the entire harmony with the prod-
uct.
The contents of this manual will be checked in periodical intervals,
corrections will be made in the following edition. We look forward to
your suggestions for improvement. Release 4.22.01
Subject to technical alteration.

vii7SA6 Manual
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Table of Contents
Preface................................................................................................................................................. iii
Table of Contents .............................................................................................................................. vii
1 Introduction....................................................................................................................................... 1-1
1.1 Overall Operation ................................................................................................................ 1-2
1.2 Applications......................................................................................................................... 1-5
1.3 Features .............................................................................................................................. 1-8
1.4 Scope of Functions.............................................................................................................. 1-9
2 Hardware and Connections ............................................................................................................. 2-1
2.1 Version of 7SA6 for Panel Flush Mounting (Cubicle Mounting) .......................................... 2-2
2.1.1 Housing ............................................................................................................................... 2-2
2.1.2 Screw Terminal Connections............................................................................................. 2-11
2.1.3 Connections to Plug-In Terminals .....................................................................................2-15
2.1.4 Connections to Optical Communication Interfaces............................................................2-18
2.1.5 Connections to Electrical Communication Interfaces ........................................................ 2-20
2.1.6 Connections to Analog Outputs......................................................................................... 2-21
2.2 Version of 7SA6 for Panel Surface Mounting.................................................................... 2-22
2.2.1 Housing .............................................................................................................................2-22
2.2.2 Screw Terminal Connections............................................................................................. 2-29
2.2.3 Connections to Optical Communication Interfaces............................................................2-30
2.2.4 Connections to Electrical Communication Interfaces ........................................................ 2-34
2.2.5 Connections to Analog Outputs......................................................................................... 2-35
2.3 Version of 7SA6 with Detached Operator Panel ............................................................... 2-36
2.3.1 Housing and Detached Operator Panel.............................................................................2-36
2.3.2 Screw Terminal Connections............................................................................................. 2-38
2.3.3 Connections to Plug-In Terminals .....................................................................................2-42
2.3.4 Connections to Optical Communication Interfaces............................................................2-45
2.3.5 Connections to Electrical Communication Interfaces ........................................................ 2-48
2.3.6 Connections to Analog Outputs......................................................................................... 2-49
3 Initial Inspections ............................................................................................................................. 3-1
3.1 Unpacking and Repacking...................................................................................................3-2

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3.2 Inspections upon Receipt ....................................................................................................3-3
3.2.1 Inspection of Features and Ratings.....................................................................................3-3
3.2.2 Electrical Check...................................................................................................................3-3
3.3 User Interface......................................................................................................................3-4
3.3.1 Operation Using the Operator Control Panel.......................................................................3-4
3.3.2 Operation Using DIGSI®4...................................................................................................3-6
3.4 Storage..............................................................................................................................3-12
4SIPROTEC
®4 Devices ......................................................................................................................4-1
4.1 General................................................................................................................................4-2
4.1.1 Protection and Control.........................................................................................................4-2
4.1.2 Communication....................................................................................................................4-2
4.1.3 Settings................................................................................................................................4-4
4.1.4 Operations...........................................................................................................................4-4
4.1.5 Oscillographic Fault Records...............................................................................................4-4
4.2 Operator Control Facilities...................................................................................................4-5
4.2.1 Operator Control Panel On Device......................................................................................4-5
4.2.2 DIGSI®4 Tool......................................................................................................................4-7
4.3 Information Retrieval............................................................................................................4-8
4.3.1 Annunciations......................................................................................................................4-9
4.3.2 Measurements...................................................................................................................4-11
4.3.3 Oscillographic Fault Records.............................................................................................4-13
4.4 Control...............................................................................................................................4-14
4.5 Manual Overwrite / Tagging...............................................................................................4-16
4.6 General about the Setting Procedures ..............................................................................4-17
4.7 Configuration of the Scope of Device Functions................................................................4-20
4.8 Configuration of Inputs and Outputs (Configuration Matrix) ..............................................4-21
4.9 Programmable Logic CFC.................................................................................................4-24
4.10 Power System Data...........................................................................................................4-26
4.11 Setting Groups...................................................................................................................4-27
4.12 General Device Settings....................................................................................................4-29
4.13 Time Synchronization........................................................................................................4-30
4.14 Serial Interfaces.................................................................................................................4-31
4.15 Passwords.........................................................................................................................4-33

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5 Configuration .................................................................................................................................... 5-1
5.1 Configuration of Functions................................................................................................... 5-2
5.1.1 Settings ...............................................................................................................................5-6
5.2 Configuration of the Binary Inputs and Outputs................................................................... 5-9
5.2.1 Preparation.......................................................................................................................... 5-9
5.2.2 Structure and Operation of the Configuration Matrix......................................................... 5-16
5.2.3 Establishing Information Properties...................................................................................5-19
5.2.4 Performing Configuration................................................................................................... 5-28
5.2.5 Transferring Metered Values............................................................................................. 5-36
5.2.6 Settings for Contact Chatter Blocking................................................................................ 5-37
5.3 Creating User Defined Functions with CFC.......................................................................5-39
5.4 Establishing a Default Display........................................................................................... 5-48
5.5 Draft of a Feeder Control Display...................................................................................... 5-52
5.6 Serial Interfaces ................................................................................................................ 5-54
5.7 Date and Time Stamping...................................................................................................5-58
6 Functions........................................................................................................................................... 6-1
6.1 General................................................................................................................................ 6-2
6.1.1 Power System Data 1..........................................................................................................6-7
6.1.1.1 Settings .............................................................................................................................6-11
6.1.2 Setting Groups .................................................................................................................. 6-14
6.1.2.1 Settings ............................................................................................................................6-16
6.1.2.2 Information Overview......................................................................................................... 6-16
6.1.3 General Protection Data....................................................................................................6-17
6.1.3.1 Settings .............................................................................................................................6-25
6.1.3.2 Information Overview ........................................................................................................6-27

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6.2 Distance Protection............................................................................................................6-29
6.2.1 Earth Fault Recognition.....................................................................................................6-29
6.2.1.1 Method of Operation..........................................................................................................6-29
6.2.1.2 Setting of the Parameters for this Function .......................................................................6-32
6.2.2 Fault detection...................................................................................................................6-32
6.2.2.1 Overcurrent Fault Detection...............................................................................................6-32
6.2.2.2 Voltage-Dependent Current Fault Detection U/I................................................................6-33
6.2.2.3 Voltage and Phase-Angle Dependent Current Fault Detection U/I/j..................................6-36
6.2.2.4 Applying the Function Parameter Settings ........................................................................6-37
6.2.2.5 Settings..............................................................................................................................6-40
6.2.2.6 Information Overview ........................................................................................................6-41
6.2.3 Calculation of the Impedances ..........................................................................................6-42
6.2.3.1 Method of Operation..........................................................................................................6-42
6.2.3.2 Applying the Function Parameter Settings ........................................................................6-49
6.2.3.3 Settings..............................................................................................................................6-51
6.2.3.4 Information Overview.........................................................................................................6-52
6.2.4 Distance Protection with Polygonal Tripping Characteristic (optional) ..............................6-55
6.2.4.1 Method of Operation..........................................................................................................6-55
6.2.4.2 Applying the Function Parameter Settings ........................................................................6-60
6.2.4.3 Settings..............................................................................................................................6-64
6.2.5 Tripping Logic of the Distance Protection..........................................................................6-67
6.2.5.1 Method of Operation..........................................................................................................6-67
6.2.5.2 Applying the Function Parameter Settings ........................................................................6-71
6.3 Measures to Be Taken in Case of Power Swings (optional)..............................................6-72
6.3.1 Method of Operation..........................................................................................................6-72
6.3.2 Applying the Function Parameter Settings ........................................................................6-77
6.3.3 Settings ............................................................................................................................6-77
6.3.4 Information Overview ........................................................................................................6-77
6.4 Protection Data Interfaces and Protection Data Topology (optional).................................6-78
6.4.1 Function description...........................................................................................................6-78
6.4.2 Setting Function Parameters.............................................................................................6-81
6.4.3 Settings..............................................................................................................................6-84
6.4.4 Information Overview.........................................................................................................6-84
6.5 Transmission of Binary Information (optional) ..................................................................6-86
6.5.1 Information Overview ........................................................................................................6-86

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6.6 Teleprotection Schemes with Distance Protection............................................................ 6-89
6.6.1 Method of Operation..........................................................................................................6-90
6.6.1.1 Permissive Underreach Transfer Trip with Pick-up (PUTT) .............................................. 6-91
6.6.1.2 Permissive Underreach Transfer Trip with Zone Acceleration Z1B (PUTT)...................... 6-93
6.6.1.3 Direct Underreach Transfer Trip........................................................................................ 6-95
6.6.1.4 Permissive Overreach Transfer Trip (POTT)..................................................................... 6-96
6.6.1.5 Directional Comparison Pickup ......................................................................................... 6-99
6.6.1.6 Unblocking with Z1B........................................................................................................6-102
6.6.1.7 Blocking scheme .............................................................................................................6-106
6.6.1.8 Pilot Wire Comparison.....................................................................................................6-109
6.6.1.9 Reverse Interlocking........................................................................................................6-111
6.6.1.10 Transient Blocking...........................................................................................................6-112
6.6.1.11 Measures for Weak and Zero Infeed............................................................................... 6-112
6.6.2 Applying the Function Parameter Settings...................................................................... 6-114
6.6.3 Settings ...........................................................................................................................6-118
6.6.4 Information Overview ......................................................................................................6-119
6.7 Earth Fault Protection in Earthed Systems (optional)...................................................... 6-121
6.7.1 Method of Operation........................................................................................................6-121
6.7.2 Applying the Function Parameter Settings...................................................................... 6-128
6.7.3 Settings ...........................................................................................................................6-135
6.7.4 Information Overview ......................................................................................................6-138
6.8 Earth Fault Protection Teleprotection Schemes (optional)..............................................6-139
6.8.1 Method of Operation........................................................................................................6-140
6.8.1.1 Directional Comparison Scheme.....................................................................................6-140
6.8.1.2 Directional Unblocking Scheme.......................................................................................6-144
6.8.1.3 Directional Blocking Scheme...........................................................................................6-146
6.8.1.4 Transient Blocking...........................................................................................................6-148
6.8.1.5 Measures for Weak or Zero Infeed..................................................................................6-149
6.8.2 Applying the Function Parameter Settings...................................................................... 6-151
6.8.3 Settings ...........................................................................................................................6-154
6.8.4 Information Overview ......................................................................................................6-155
6.9 Weak-Infeed Tripping......................................................................................................6-156
6.9.1 Method of Operation........................................................................................................6-156
6.9.2 Applying the Function Parameter Settings...................................................................... 6-158
6.9.3 Settings ...........................................................................................................................6-159
6.9.4 Information Overview ......................................................................................................6-159
6.10 External Direct and Remote Tripping ..............................................................................6-160
6.10.1 Method of Operation........................................................................................................6-160
6.10.2 Applying the Function Parameter Settings......................................................................6-161
6.10.3 Settings .......................................................................................................................... 6-161
6.10.4 Information Overview ...................................................................................................... 6-161
6.11 Overcurrent Protection .................................................................................................... 6-162
6.11.1 Method of Operation........................................................................................................6-163
6.11.2 Applying the Function Parameter Settings......................................................................6-169
6.11.3 Settings ........................................................................................................................... 6-174
6.11.4 Information Overview ...................................................................................................... 6-175

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6.12 High-Current Switch-On-To-Fault Protection...................................................................6-178
6.12.1 Method of Operation........................................................................................................6-178
6.12.2 Applying the Function Parameter Settings ......................................................................6-179
6.12.3 Settings............................................................................................................................6-179
6.12.4 Information Overview ......................................................................................................6-179
6.13 Earth Fault Detection in Non-Earthed Systems...............................................................6-180
6.13.1 Method of Operation........................................................................................................6-180
6.13.2 Applying the Function Parameter Settings ......................................................................6-183
6.13.3 Settings............................................................................................................................6-186
6.13.4 Information Overview ......................................................................................................6-187
6.14 Automatic Reclosure Function (optional).........................................................................6-188
6.14.1 Method of Operation........................................................................................................6-189
6.14.2 Setting the function parameters.......................................................................................6-205
6.14.3 Settings............................................................................................................................6-211
6.14.4 Information Overview.......................................................................................................6-214
6.15 Synchronism and Voltage Check (optional).....................................................................6-217
6.15.1 Method of Operation........................................................................................................6-217
6.15.2 Applying the Function Parameter Settings ......................................................................6-220
6.15.3 Settings............................................................................................................................6-224
6.15.4 Information Overview.......................................................................................................6-225
6.16 Voltage Protection (optional) ..........................................................................................6-227
6.16.1 Method of Operation........................................................................................................6-227
6.16.1.1 Overvoltage Protection....................................................................................................6-227
6.16.1.2 Undervoltage Protection..................................................................................................6-231
6.16.2 Applying the Function Parameter Settings ......................................................................6-234
6.16.3 Settings............................................................................................................................6-237
6.16.4 Information Overview ......................................................................................................6-238
6.17 Fault Location..................................................................................................................6-242
6.17.1 Method of Operation........................................................................................................6-242
6.17.2 Applying the Function Parameter Settings ......................................................................6-244
6.17.3 Settings ...........................................................................................................................6-246
6.17.4 Information Overview.......................................................................................................6-247
6.18 Circuit Breaker Failure Protection (optional)....................................................................6-248
6.18.1 Method of Operation........................................................................................................6-248
6.18.2 Applying the Function Parameter Settings ......................................................................6-259
6.18.3 Settings............................................................................................................................6-263
6.18.4 Information Overview ......................................................................................................6-264
6.19 Thermal Overload Protection...........................................................................................6-265
6.19.1 Method of Operation........................................................................................................6-265
6.19.2 Applying the Function Parameter Settings ......................................................................6-266
6.19.3 Settings............................................................................................................................6-268
6.19.4 Information Overview ......................................................................................................6-268

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6.20 Analog Outputs (optional)................................................................................................ 6-269
6.20.1 Method of Operation........................................................................................................6-269
6.20.2 Applying the Function Parameter Settings......................................................................6-269
6.20.3 Settings ........................................................................................................................... 6-272
6.21 Monitoring Functions.......................................................................................................6-274
6.21.1 Method of Operation........................................................................................................6-274
6.21.1.1 Hardware Monitoring.......................................................................................................6-274
6.21.1.2 Software–Monitoring........................................................................................................6-276
6.21.1.3 Monitoring of the External Instrument Transformer Circuits............................................ 6-276
6.21.1.4 Trip Circuit Supervision ................................................................................................... 6-281
6.21.1.5 Response to Failures....................................................................................................... 6-283
6.21.1.6 Group Alarms ..................................................................................................................6-286
6.21.2 Applying the Function Parameter Settings......................................................................6-286
6.21.3 Settings ........................................................................................................................... 6-288
6.21.4 Information Overview.......................................................................................................6-289
6.22 Function Control.............................................................................................................. 6-292
6.22.1 Detection of Line Energization.........................................................................................6-292
6.22.2 Processing of the Circuit Breaker Position......................................................................6-293
6.22.3 Overall Fault Detection Logic of the Device ....................................................................6-296
6.22.4 Overall Tripping Logic of the Device................................................................................6-297
6.22.5 Circuit Breaker Trip Test..................................................................................................6-303
6.22.6 Applying the Function Parameter Settings......................................................................6-304
6.22.7 Settings ........................................................................................................................... 6-304
6.22.8 Information Overview.......................................................................................................6-305
6.23 Supplementary Functions................................................................................................6-306
6.23.1 Processing of Messages ................................................................................................. 6-306
6.23.2 Operational Measurement...............................................................................................6-308
6.23.3 Data Storage for Fault Recording.................................................................................... 6-311
6.23.4 Applying the Function Parameter Settings......................................................................6-312
6.23.5 Settings ........................................................................................................................... 6-313
6.23.6 Information Overview.......................................................................................................6-314
6.24 Processing of Commands ..............................................................................................6-318
6.24.1 Types of commands........................................................................................................ 6-318
6.24.2 Steps in the Command Sequence...................................................................................6-319
6.24.3 Interlocking...................................................................................................................... 6-320
6.24.3.1 Interlocked/Non-Interlocked Switching............................................................................ 6-320
6.24.4 Recording and acknowledgement of commands.............................................................6-323

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7 Control During Operation.................................................................................................................7-1
7.1 Read-out of Information.......................................................................................................7-2
7.1.1 Messages ............................................................................................................................7-2
7.1.1.1 Output of Messages.............................................................................................................7-2
7.1.1.2 Event Log (Operating Messages)........................................................................................7-5
7.1.1.3 Trip Log (Fault Messages)...................................................................................................7-6
7.1.1.4 Earth Fault Messages..........................................................................................................7-9
7.1.1.5 Saving and Erasing the Messages....................................................................................7-11
7.1.1.6 General Interrogation.........................................................................................................7-12
7.1.1.7 Spontaneous Messages....................................................................................................7-12
7.1.2 Switching Statistics............................................................................................................7-13
7.1.2.1 Viewing the Switching Statistics ........................................................................................7-13
7.1.2.2 Resetting and Setting the Switching Statistics...................................................................7-14
7.1.3 Measured Values...............................................................................................................7-15
7.1.3.1 Measured Values...............................................................................................................7-15
7.1.3.2 Energy ...............................................................................................................................7-21
7.1.3.3 Setting Set Points..............................................................................................................7-21
7.1.3.4 Resetting of Metered Values and Minimum/Maximum Values..........................................7-24
7.1.4 Fault Records ....................................................................................................................7-26
7.1.4.1 Viewing Fault Records.......................................................................................................7-26
7.1.4.2 Saving the Fault Records ..................................................................................................7-27
7.2 Control of Device Functions...............................................................................................7-28
7.2.1 Read and Set Date and Time............................................................................................7-28
7.2.2 Changeover of Setting Groups..........................................................................................7-34
7.2.3 Test Messages to the System (SCADA) Interface during Test Operation.........................7-36
7.2.4 Test Mode of the Signal Transmission (optional) ..............................................................7-38
7.3 Circuit Breaker Test Function............................................................................................7-42
7.4 Control of Switchgear ........................................................................................................7-46
7.4.1 Display Equipment Position and Control ...........................................................................7-47
7.4.2 Manual Overwriting............................................................................................................7-51
7.4.3 Set Status..........................................................................................................................7-52
7.4.4 Interlocking ........................................................................................................................7-53
7.4.5 Tagging..............................................................................................................................7-55
7.4.6 Switching Authority............................................................................................................7-56
7.4.7 Switching Mode .................................................................................................................7-57
7.4.8 Control Messages..............................................................................................................7-58
7.4.9 Other Commands ..............................................................................................................7-59

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8 Installation and Commissioning ..................................................................................................... 8-1
8.1 Mounting and Connections.................................................................................................. 8-2
8.1.1 Installation ...........................................................................................................................8-2
8.1.2 Termination variants............................................................................................................ 8-9
8.1.3 Hardware Modifications..................................................................................................... 8-15
8.1.3.1 General.............................................................................................................................. 8-15
8.1.3.2 Disassembly of the Device................................................................................................ 8-16
8.1.3.3 Jumper Settings on Printed Circuit Boards........................................................................8-21
8.1.3.4 Interface Modules.............................................................................................................. 8-36
8.1.3.5 Reassembly of Device.......................................................................................................8-40
8.2 Checking the Connections................................................................................................. 8-41
8.2.1 Data Connections..............................................................................................................8-41
8.2.2 Checking the Protection Data Communication.................................................................. 8-44
8.2.3 Checking Power Plant Connections..................................................................................8-45
8.3 Commissioning.................................................................................................................. 8-47
8.3.1 Testing mode and transmission blocking .......................................................................... 8-48
8.3.2 Checking the System (SCADA) Interface..........................................................................8-48
8.3.3 Checking the Binary Inputs and Outputs........................................................................... 8-50
8.3.4 Checking Analog Outputs.................................................................................................. 8-52
8.3.5 Checking the Communication Topology............................................................................ 8-53
8.3.6 Tests for the Circuit Breaker Failure Protection................................................................. 8-56
8.3.7 Current, Voltage, and Phase Rotation Checks..................................................................8-59
8.3.8 Directional Checks with Load Current............................................................................... 8-60
8.3.9 Polarity check for the voltage input U4.............................................................................. 8-61
8.3.10 Earth Fault Check in a Non-earthed System..................................................................... 8-63
8.3.11 Polarity Check for the Current Measuring Input I4............................................................. 8-64
8.3.12 Measuring the operating time of the circuit breaker ..........................................................8-68
8.3.13 Testing of the Teleprotection System................................................................................8-69
8.3.13.1 Teleprotection with Distance Protection............................................................................ 8-69
8.3.13.2 Teleprotection with Earth Fault Protection......................................................................... 8-72
8.3.13.3 Transfer Trip Signal Transmission for Breaker Failure Protection and/or Stub Protection 8-74
8.3.13.4 Signal Transmission for Intertripping and Direct Transfer Tripping................................... 8-74
8.3.14 Testing User-Defined Functions........................................................................................ 8-74
8.3.15 Trip and Close Test with the Circuit Breaker..................................................................... 8-75
8.3.16 Switching Check for the Configured Operating Devices.................................................... 8-75
8.3.17 Triggering Oscillographic Recordings................................................................................ 8-75
8.4 Final Preparation of the Device......................................................................................... 8-77
9 Routine Checks and Maintenance .................................................................................................. 9-1
9.1 General................................................................................................................................ 9-2
9.2 Routine Checks................................................................................................................... 9-3

xvi 7SA6 Manual
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9.3 Maintenance........................................................................................................................9-4
9.3.1 Replacing the Buffer Battery................................................................................................9-4
9.3.1.1 Battery Change on Devices with Panel Flush Mounting and Cubicle Flush Mounting as well as
Panel Surface Mounting ......................................................................................................9-4
9.3.1.2 Battery Change on Devices with Mounting Housing with Detached Operator Panel ..........9-6
9.4 Troubleshooting...................................................................................................................9-9
9.5 Corrective Action / Repairs................................................................................................9-12
9.5.1 Software Procedures.........................................................................................................9-12
9.5.2 Hardware Procedures........................................................................................................9-12
9.6 Return................................................................................................................................9-16
10 Technical Data.................................................................................................................................10-1
10.1 General Device Data .........................................................................................................10-2
10.1.1 Analog Inputs.....................................................................................................................10-2
10.1.2 Power Supply.....................................................................................................................10-2
10.1.3 Binary Inputs and Outputs.................................................................................................10-3
10.1.4 Communications Interfaces...............................................................................................10-6
10.1.5 Electrical Tests ..................................................................................................................10-9
10.1.6 Mechanical Stress Tests..................................................................................................10-11
10.1.7 Climatic Stress Tests.......................................................................................................10-12
10.1.8 Service Conditions...........................................................................................................10-12
10.1.9 Certifications....................................................................................................................10-13
10.1.10 Construction.....................................................................................................................10-13
10.2 Distance Protection..........................................................................................................10-15
10.3 Power Swing Supplement (optional)................................................................................10-18
10.4 Distance Protection Teleprotection Schemes..................................................................10-18
10.5 Earth Fault Protection in Earthed Systems (optional)......................................................10-19
10.6 Earth Fault Protection Teleprotection Schemes (optional)..............................................10-27
10.7 Weak-Infeed Tripping ......................................................................................................10-28
10.8 Protection Data Interface and Distance Protection Topology
(optional)..........................................................................................................................10-29
10.9 External Direct and Remote Tripping...............................................................................10-30
10.10 Overcurrent Protection.....................................................................................................10-30
10.11 High-Current Switch-On-To-Fault Protection...................................................................10-33
10.12 Earth Fault Detection in a Non-Earthed System..............................................................10-33
10.13 Automatic Reclosure Function (optional).........................................................................10-34
10.14 Synchronism and Voltage Check (optional).....................................................................10-35
10.15 Voltage Protection (optional) ...........................................................................................10-36

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10.16 Fault Location..................................................................................................................10-38
10.17 Circuit Breaker Failure Protection (optional)....................................................................10-38
10.18 Thermal Overload Protection...........................................................................................10-40
10.19 Monitoring Functions.......................................................................................................10-42
10.20 Transmission of Binary Information (optional).................................................................10-43
10.21 Supplementary Functions................................................................................................10-44
10.22 Dimensions......................................................................................................................10-47
A Appendix ...........................................................................................................................................A-1
A.1 Ordering Information and Accessories ...............................................................................A-2
A.1.1 Accessories.......................................................................................................................A-10
A.2 General Diagrams .............................................................................................................A-13
A.2.1 Panel Flush Mounting or Cubicle Mounting.......................................................................A-13
A.2.2 Panel Surface Mounting....................................................................................................A-27
A.2.3 Housing for Mounting with Detached Operator Panel.......................................................A-41
A.3 Connection Examples........................................................................................................A-51
A.4 Preset Configurations........................................................................................................A-66
A.5 Protocol Dependent Functions..........................................................................................A-75
B Appendix ...........................................................................................................................................B-1
B.1 Settings ...............................................................................................................................B-2
B.2 List of Information..............................................................................................................B-23
B.3 Measured Values .............................................................................................................B-59
Index ............................................................................................................................................Index1

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1-17SA6 Manual
C53000-G1176-C156-2
Introduction 1
The SIPROTEC®4 devices 7SA6 are introduced in this chapter. An overview of the
devices is presented in their application, features, and scope of functions.
1.1 Overall Operation 1-2
1.2 Applications 1-5
1.3 Features 1-8
1.4 Scope of Functions 1-9

Introduction
1-2 7SA6 Manual
C53000-G1176-C156-2
1.1 Overall Operation
The numerical Distance Protection SIPROTEC®7SA6 is equipped with a powerful 32
Bit microprocessor. This provides fully numerical processing of all functions in the
device, from the acquisition of the measured values up to the output of commands to
the circuit breakers. Figure 1-1 shows the basic configuration of the device.
Analog Inputs The measuring inputs MI transform the currents and voltages derived from the
instrument transformers and match them to the internal signal levels for processing in
the device. The device has 4 current and 4 voltage inputs. Three current inputs are
provided for measurement of the phase currents, a further measuring input (I4)may
be configured to measure the earth current (residual current from the current
transformer star-point), the earth current of a parallel line (for parallel line
compensation) or the star-point current of a power transformer (for earth fault direction
determination).
µC
∩
#
Error
Run
Output Relays
(allocatable)
LEDs
on the
Front Panel
(allocatable)
Display on
the Front Panel
Operating
Interface to
PC
System
Interface to
SCADA
IL1
IL2
IL3
I4
UL1
UL2
UL3
U4
789
456
123
.0+/-
ESC ENTER
Operator
Control Panel
aux
Binary Inputs (allocatable)
Power Supply
Time
Synchronization
MI IA AD µC OA
Figure 1-1 Hardware structure of the numerical device 7SA6 (maximum configuration)
e.g.
CF77
IRIGB
PS
Service
Interface PC/
Modem
„Fault“
Protection Data
Interface to
remote
end/CC