Siemens SIPROTEC 7ST6 User manual

SIPROTEC
Numerical Overhead
Contact Line Protection for
AC Traction Power Supply
7ST6
V4.2
Manual
E50417-G1176-C251-A3
Preface
Introduction 1
Functions 2
Mounting and Commissioning 3
Technical Data 4
Appendix A
Literature
Glossary
Index
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7ST6 Manual
E50417-G1176-C251-A3
Disclaimer of liability
We have checked the text of this manual against the hardware
and software described. However, deviations from the descrip-
tion cannot be completely ruled out, so that no liability can be ac-
cepted 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 edi-
tions. We appreciate any suggestions for improvement.
We reserve the right to make technical improvements without
notice.
Copyright
Copyright © Siemens AG 2006. All rights reserved.
Dissemination or reproduction of this document, or evaluation
and communication of its contents, is not authorized except
where expressly permitted. Violations are liable for damages. All
rightsreserved,particularly for the purposes of patentapplication
or trademark registration.
Registered Trademarks
SIPROTEC, SINAUT, SICAM, SITRAS and DIGSI are registered
trademarks of SIEMENS AG. Other designations in this manual
might be trademarks whose use by third parties for their own pur-
poses would infringe the rights of the owner.
Document Release 4.10.01
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37ST6 Manual
E50417-G1176-C251-A3
Preface
Purpose of this
Manual This manual describes the functions, operation, mounting, and placing into service of device 7ST6. In particular, one will find:
• Information on how to configure the device scope and a description of the device
functions and setting options;
• Instructions for mounting and commissioning;
• Compilation of the technical specifications;
• Summary of the most significant data for the experienced user in the Appendix.
General information about design, configuration, and operation of SIPROTEC 4
devices are laid down in the SIPROTEC 4 System Description.
Target Audience Protection engineers, commissioning engineers, personnel concerned with adjust-
ment, checking, and service of selective protective equipment, automatic and control
facilities, and personnel of electrical facilities and power plants.
Validity of the
Manual This manual is valid for: SIPROTEC®4 Numerical Overhead Contact Line Protection
for AC Traction Power Supply 7ST6 ; Firmware version V4.2.
Indication of Con-
formity
Additional Support Should you have any further questions regarding the SIPROTEC 4 system please
contact your local Siemens distributor.
Additional informa-
tion: Internet:
In order to remain up-to-date in the future, please make use of the offer on our down-
load platform on the Internet under address:
http://www.siprotec.de
This product complies with the directive of the Council of the European Communi-
ties on the approximation of the laws of the Member States relating to electromag-
netic 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 is proved by tests conducted by Siemens AG in accordance with
Article 10 of the Council Directives in agreement with the generic standards
EN61000-6-2 and EN 61000-6-4 for the EMC directive, and with the standard EN
60255-6 for the low-voltage directive.
This device is designed and produced for industrial use.
The product conforms with the international standard of the series IEC 60255 and
the German standard VDE 0435.
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Preface
47ST6 Manual
E50417-G1176-C251-A3
Should you experience any problems in using SIPROTEC 4, please contact our
Hotline
Telephone: +49 - 180 - 524 7000
Fax: +49 - 180 - 524 2471
E-mail: [email protected]
WARNING!
Hazardous voltages are present in this electrical equipment during operation.
Death, severe personal injury or substantial property damage can result if the device
is not handled properly.
Only qualified personnel shall work on and in the vicinity of this equipment. The per-
sonnel must be thoroughly familiar with all warnings and maintenance procedures of
this manual as well as the safety regulations.
Successful and safe operation of the device is dependent on proper transportation,
storage, mountingand assembly and the observance of the warnings and instructions
of the unit manual.
In particular, the general installation and safety regulations for work in power current
plants (e.g. ANSI, IEC, EN, DIN, or other national and international regulations) must
be observed.
Instructions and
Warnings The warnings andnotes contained in this manual serve for your own safety and for an appropriate lifetime of the device. Please observe them!
The following indicators and standard definitions are used:
DANGER!
indicates that death, severe personal injury or substantial property damage can
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 particularly applies to 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.
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Preface
5
7ST6 Manual
E50417-G1176-C251-A3
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:
Definition QUALIFIED PERSONNEL
Prerequisites to proper and safe operation of this product are proper transport,
proper storage, setup, installation, operation, and maintenance of the product, as
well as careful operation and servicing of the device within the scope of the warn-
ings and instructions of this manual. Qualifications are:
• Training and Instruction to energize, de-energize, clear, ground and tag circuits
and equipment in accordance with established safety practices.
• Training and instruction (or other qualification) for switching, earthing, and des-
ignating devices and systems.
• Training in rendering first aid.
Typographic and
Graphical Conven-
tions
To designate terms which refer in the text to information of the device or for the
device, the following fonts are used:
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
DIGSI), are marked in bold letters of a monospace font. The same goes for the titles
of menus.
1234A
Parameter addresses have the same character style as parameter names. Param-
eter addresses in overview tables contain the suffix A, if the parameter is only avail-
able using the option Display additional settings.
Parameter Conditions
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 soft-
ware DIGSI), are additionally writtenin italics. The same goes for the options of the
menus.
„Annunciations“
Designatorsforinformation,whichmaybeoutputbythe relay orrequiredfromother
devices or from the switch gear, are marked in a monospace type style in quotation
marks.
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 signalwith number (device indication)
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Preface
67ST6 Manual
E50417-G1176-C251-A3
Besides these, graphical symbols are used according to IEC 60617-12 and IEC
60617-13 orsymbols derived from these standards.Some of the mostfrequently used
are listed below:
■
Externalbinaryoutputsignalwith number (deviceindication)
used as input signal
Example of a parameter switch designated FUNCTION with
the address 1234 and the possible settings ON and OFF
Input signal of an analog quantity
AND gate
OR gate
Exclusive OR (antivalence): output is active, if only one of
the inputs is active
Coincidence gate (equivalence): output is active if both
inputs are active or inactive at the same time
Dynamic inputs(edge–triggered) abovewith positive, below
with negative edge
Formation of one analog output signal from a number of
analog input signals
Limit stage with setting address and parameter designator
(name)
Timer (pickup delay T, example adjustable) with setting
address and parameter designator (name)
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)
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77ST6 Manual
E50417-G1176-C251-A3
Contents
1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.1 Overall Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.2 Application Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1.3 Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2 Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.1.1 Functional Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.1.1.1 Configuration of the Functional Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.1.1.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.1.1.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.1.2 Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.1.2.1 Trip Dependent Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.1.2.2 Spontaneous Indications on the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.1.2.3 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.1.2.4 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.1.2.5 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.1.3 Power System Data 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.1.3.1 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.1.3.2 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.1.3.3 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.1.4 Change Group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.1.4.1 Purpose of the Setting Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.1.4.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.1.4.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2.1.4.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2.1.5 Power System Data 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2.1.5.1 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2.1.5.2 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
2.1.5.3 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
2.1.6 Oscillographic Fault Records. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
2.1.6.1 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
2.1.6.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
2.1.6.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
2.1.6.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
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Contents
87ST6 Manual
E50417-G1176-C251-A3
2.2 Distance Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
2.2.1 Enabling the Distance Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
2.2.2 Distance Protection with Combined Tripping Characteristic . . . . . . . . . . . . . . . . . . . . . . . . 48
2.2.3 Distance Protection with Polygonal Tripping Characteristic . . . . . . . . . . . . . . . . . . . . . . . . 50
2.2.4 Short-circuit Detection by Current and Voltage Angle Changes . . . . . . . . . . . . . . . . . . . . . 52
2.2.5 Tripping Logic of the Distance Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
2.2.6 Tripping Characteristic for Manual Reclose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
2.2.7 Tripping Characteristic for Manual Close. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
2.2.8 Zone Changeover (only for 16.7 Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
2.2.9 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
2.2.10 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
2.2.11 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
2.3 Overcurrent Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
2.3.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
2.3.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
2.3.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
2.3.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
2.4 High-Speed Overcurrent Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
2.4.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
2.4.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
2.4.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
2.4.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
2.5 Emergency Overcurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
2.5.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
2.5.2 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
2.5.3 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
2.5.4 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
2.5.5 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
2.6 Overvoltage and Undervoltage Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
2.6.1 Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
2.6.2 Undervoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
2.6.3 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
2.6.4 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
2.6.5 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
2.7 Thermal Overload Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
2.7.1 Thermal Overload Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
2.7.2 Ambient Temperature Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
2.7.3 Catenary Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
2.7.4 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
2.7.5 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
2.7.6 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
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Contents
9
7ST6 Manual
E50417-G1176-C251-A3
2.8 Circuit Breaker Failure Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
2.8.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
2.8.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
2.8.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
2.8.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
2.9 Trip Supervision. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
2.9.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
2.9.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110
2.9.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110
2.9.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110
2.10 Defrosting Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111
2.10.1 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111
2.10.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .117
2.10.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
2.10.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
2.11 InRush Restraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
2.11.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
2.11.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
2.11.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
2.11.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
2.12 Automatic Reclosure Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
2.12.1 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
2.12.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
2.12.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
2.12.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
2.13 Synchronism and Voltage Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
2.13.1 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
2.13.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
2.13.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
2.13.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
2.14 Fault Locator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
2.14.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
2.14.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
2.14.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
2.14.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
2.15 It Function (current-time integral) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
2.15.1 Function Description It Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
2.15.2 Function Description 2P-procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
2.15.3 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
2.15.4 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
2.15.5 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
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2.16 Monitoring Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
2.16.1 Hardware Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
2.16.2 Software Monitoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
2.16.3 Fuse Failure Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
2.16.4 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
2.16.5 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
2.16.6 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
2.17 Trip Circuit Supervision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
2.17.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
2.17.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
2.17.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
2.17.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
2.18 Protection Function Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
2.18.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
2.18.1.1 Line Energization Recognition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
2.18.1.2 Detection of the Circuit Breaker Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
2.18.1.3 Pickup Logic for the Entire Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
2.18.1.4 Tripping Logic of the Entire Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
2.18.1.5 Pickup of the Automatic Test Unit for the Overhead Contact Line (only for 16.7 Hz) . . . . 182
2.18.1.6 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
2.18.2 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
2.18.2.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
2.18.2.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
2.18.2.3 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
2.19 Auxiliary Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
2.19.1 Message Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
2.19.1.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
2.19.2 Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
2.19.2.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
2.19.2.2 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
2.19.3 Statistics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
2.19.3.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
2.19.3.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
2.19.3.3 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
2.20 Command Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
2.20.1 Control Authorization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
2.20.1.1 Command Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
2.20.1.2 Sequence in the Command Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
2.20.1.3 Interlocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
2.20.1.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
2.20.2 Control Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
2.20.2.1 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
2.20.3 Process Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
2.20.3.1 Method of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
2.20.4 Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
2.20.4.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
2.20.4.2 Measured value overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
2.20.4.3 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
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2.21 Use in auto-transformer systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
2.21.1 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
2.21.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
3 Mounting and Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
3.1 Mounting and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
3.1.1 Configuration Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
3.1.2 Hardware Modifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
3.1.2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
3.1.2.2 Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
3.1.2.3 Switching Elements on Printed Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
3.1.2.4 Interface Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
3.1.2.5 Reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
3.1.3 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
3.1.3.1 Panel Flush Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
3.1.3.2 Rack and Cubicle Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
3.2 Checking Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
3.2.1 Checking Data Connections of Serial Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
3.2.2 Checking System Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
3.3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
3.3.1 Test Mode and Transmission Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
3.3.2 Checking Time Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
3.3.3 Testing System Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
3.3.4 Checking the Binary Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
3.3.5 Tests for Circuit Breaker Failure Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
3.3.6 Current and Voltage Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248
3.3.7 Direction Check with Load Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
3.3.8 Measuring the Operating Time of the Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . 250
3.3.9 Testing User-Defined Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
3.3.10 Trip and Close Test with the Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
3.3.11 Switching Test of the Configured Operating Equipment . . . . . . . . . . . . . . . . . . . . . . 251
3.3.12 Creating Oscillographic Recordings for Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
3.4 Final Preparation of the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253
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4 Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
4.1.1 Analog Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
4.1.2 Auxiliary Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
4.1.3 Binary Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
4.1.4 Communication Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
4.1.5 Electrical Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
4.1.6 Mechanical stress tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
4.1.7 Climatic Stress Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
4.1.8 Service Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
4.1.9 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
4.2 Distance Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266
4.3 Time Overcurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
4.4 Voltage Protection (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
4.5 Thermal Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
4.6 Circuit Breaker Failure Protection (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
4.7 Defrosting Protection (depending on device version) . . . . . . . . . . . . . . . . . . . . . . . . . 277
4.8 Inrush Restraint (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
4.9 Automatic Reclosure Function (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278
4.10 Synchronism and Voltage Check (optional and depending on device version) . . . . . . 279
4.11 Fault Locator (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
4.12 It Function (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
4.13 Trip Supervision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
4.14 Trip Circuit Supervision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
4.15 User Defined Functions (CFC) (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
4.16 Auxiliary Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284
4.17 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286
4.17.1 Housing for Panel Flush Mounting or Cubicle Mounting (Size 1/2) . . . . . . . . . . . 286
4.17.2 Housing for Panel Flush Mounting or Cubicle Mounting (Size 1/1) . . . . . . . . . . . 287
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A Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
A.1 Ordering Information and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
A.1.1 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
A.1.2 Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
A.2 Terminal Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293
A.2.1 Panel Flush Mounting or Cubicle Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293
A.3 Connection Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297
A.3.1 Connection of Measured Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297
A.4 Current Transformer Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
A.4.1 Overcurrent Factors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
Operational and Nominal Overcurrent Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
Calculation Example according to IEC 60044-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
A.5 Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
A.5.1 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
A.5.2 Binary Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
A.5.3 Binary Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
A.5.4 Function Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
A.5.5 Default Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304
A.5.6 Pre-defined CFC Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306
A.6 Protocol-dependent Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309
A.7 Functional Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310
A.8 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .311
A.9 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
A.10 Group Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337
A.11 Measured Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338
Literature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
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Contents
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157ST6 Manual
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Introduction 1
The SIPROTEC®4 7ST6 device is introduced in this chapter. An overview of the
scope of application, the properties and functional scope of the device is provided.
1.1 Overall Operation 16
1.2 Application Scope 19
1.3 Characteristics 21
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1.1 Overall Operation
The SIPROTEC®4 7ST6, Numerical Overhead Contact Line Protection for AC
Traction Power Supply, is equipped with a powerful 32-bit microprocessor. All tasks
are processed numerically, from acquisition of measured values up to commands to
the circuit breakers. Figure 1-1 shows the basic structure of the 7ST63.
There are two different device versions, 7ST61 and 7ST63, which differ mainly by the
size of their housing and the number of available inputs and outputs.
7ST61 housing size 1/2 * 19“ with 4-line display, 12 BI and 22 or 27 BO
7ST63 housing size 1/1 * 19“ with graphic display, control keys, 38 BI and 36 BO
Analog Inputs The measuring inputs (MI) convert the currents and voltages coming from the trans-
formers and adapt them to the level appropriate for the internal processing of the
device. Depending on the version, the device is equipped with up to 3 current and
voltage inputs.
Figure 1-1 Hardware structure of the numerical overhead contact line protection 7ST63
The analog values are transferred to the IA input amplifier group.
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1.1 Overall Operation
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TheIA inputamplifier group allows highimpedanceconnection for analoginputvalues
and contains filters optimized with regard to bandwidth and processing speed for mea-
sured value processing.
In the analog/digital converterunit, the analog input values are sampled, digitized and
supplied to the microcomputer system.
Microcomputer
System Apart from processing the measured values, the microcomputer system µC also exe- cutes the actual protection and control functions. They especially consist of:
• Filtering and conditioning of the measured values
• Continuous monitoring of the measured values
• Monitoring of the pickup conditions for the individual protective functions
• Scanning of limit values and time sequences
• Control of signals for logic functions
• Deciding on trip and close commands
• Storage of indications, fault data and fault values for fault analysis purposes
• Management of the operating system and its functions, e.g. data memory, real-time
clock, communication, interfaces, etc.
The information is provided via output amplifier OA.
Binary Inputs and
Outputs Binary inputs and outputs from and to the computer system are routed via the I/O modules (inputs and outputs). The computer system obtains the information from the
system (e.g remote resetting) or the external equipment (e.g. blocking commands).
Additional outputs are mainly commands that are issued to the switching devices and
indications for remote signalling of events and states.
Front Elements Optical indicators (LEDs) and a front LC display provide information on the function of
the device and indicate events, states and measured values.
Integrated control and numeric keys in conjunction with the LCD facilitate local inter-
action with the local device. All information of the device can be accessed using the
integrated control and numeric keys. The information includes protective and control
settings, operating and fault indications, measured values and settings (see also
Chapter 2 and SIPROTEC®4 System Description, Order No. E50417-H1176-C151).
Devices with control functions also allow station control on the front panel.
Serial Interfaces Via the serial interface in the front panel the communication with a personal computer
using the operating program DIGSI®is possible. This ensures convenient operation of
all device functions.
The service interface can also be used for communication with a personal computer
using DIGSI®. This interface is particularly well suited in case of hard wiring between
the devices and the PC or in case of an operation via modem.
All device data can be transmitted to a central evaluating unit orcontrol center through
the serial system (SCADA) interface. This interface may be provided with various
physical transmission modes and different protocols to suit the particular application.
An additional interface is designed for time synchronization of the internal clock by
means of external synchronization sources.
Further communication protocols can be implemented via additional interface mod-
ules.
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Power Supply These described functional units are supplied by a power supply PS with the neces-
sary power in the different voltage levels. Brief supply voltage dips which may occur
onshort circuitsinthe auxiliary voltagesupplyof thepower system areusually bridged
by a capacitor (see also Technical Data, Chapter 4).
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1.2 Application Scope
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1.2 Application Scope
The SIPROTEC®4 7ST6, Numerical Overhead Contact Line Protection for AC
Traction Power Supply, is a selective and fast protection device for overhead contact
lines with single- and multi-ended infeeds.
The device incorporates the functions which are normally required for the protection
of an overhead contact line section and is therefore capable of universal application.
Protective
Elements The basic function of the device is the recognition of the distance to the fault with dis- tance protection measurement. It is supplemented by a range of other protection func-
tions:
When switching to a faulted line section, an undelayed trip signal can be output.
In the event of a failure of the measured voltages due to a fault in the secondary cir-
cuits (e.g. trip of the voltage transformer mcb or a fuse) the device can automatically
revert to an emergency operation with an integrated time overcurrent protection
(emergency time overcurrent protection), until the measured voltage again becomes
available. There is an additional 3-stage definite/inverse time overcurrent protection
operating in parallel to, andindependent of, the distance protection. This time overcur-
rent protection has three current-independent stages and one current-dependent
stage. For inverse time overcurrent protection, several curves of different standards
are provided. The stages can be combined in any way. Moreover, a high-speed over-
current protection function with a tripping time of less than 2 ms is integrated.
Most short-circuit functions work in conjunction with an integrated automatic reclose
function which is designed for 8 reclosing attempts. Before reclosure, the validity of
the reclosure canbe checked by voltageand/orsynchronismcheckby the device (this
can be ordered as an option).
Beside the short-circuit protection functions described above, the device offers addi-
tional protection functions such as multiple-stage overvoltage and undervoltage pro-
tection, circuit breaker failure protection, and thermal overload protection, which pro-
tects the overhead contact line from excessive heating due to overloads. The fault
locator supports fast location of the fault after a short-circuit. The inrush restraint
feature is used for a clear distinction between operating and fault conditions during
switching operations. The defrosting protection feature provides high-sensitivity de-
tection of short-circuits during defrosting of the overhead contact line.
Control Functions Depending on the ordered variant the device provides control functions which can be
accomplished for activating and deactivating switchgear via the integrated operator
panel, the system interface, binary inputs and a personal computer with the operating
softwareDIGSI®.Thestatusofthe primaryequipmentcanbetransmittedtothedevice
via auxiliary contacts connected to binary inputs. The present status (or position) of
the primary equipment can be displayed on the device, and used for interlocking or
plausibility monitoring. The number of the primary equipment 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 indications. 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 capability of switching
primary equipment can be restricted by a setting associated with switching authority
(Remote or Local), and by the operating mode (interlocked/non-interlocked, with or
without password request). Processing of interlocking conditions for switching (e.g.
switching error protection) can be established with the aid of integrated, user-config-
urable logic functions.
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Indications and
Measured Values;
Fault Recording
The operational indications provide information about conditions in the power system
and the device itself. Measurement quantities and resulting computed values can be
displayed locally and communicated via the serial interfaces.
Device indications can be assigned to a number of LEDs on the front cover (allocat-
able), can be externally processed via output contacts (allocatable), linked with user-
definable logic functions and/or issued via serial interfaces.
During a fault (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 analysed subsequently.
Communication Serial interfaces are available for the communication with operating, control and
memory systems.
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