Siemens SIPROTEC 7SD80 User Manual

SIPROTEC

Preface

Contents

Introduction 1
Functions 2

Line Differential Protection
7SD80

V4.6

Manual

Mounting and Commissioning 3
Technical Data 4
Appendix A

Literature

Glossary

Index

E50417-G1140-C474-A1

Note

For safety purposes, please note instructions and warnings in the Preface.

Disclaimer of Liability

We have checked the contents of this manual against the hardware
and software described. However, deviations from the description
cannot be completely ruled out, so that no liability can be accepted
for any errors or omissions contained in the information given.

The information given in this document is reviewed regularly and
any necessary corrections will be included in subsequent editions.

Copyright

Copyright © Siemens AG 2011. 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 rights re­served, particularly for the purposes of patent application or trade­mark registration.

We appreciate any suggested improvements.
We reserve the right to make technical improvements without

notice.
Document version V04.00.03
Release date 09.2011

Registered Trademarks

SIPROTEC, SINAUT , SICAM and DIGSI are registered trademarks
of Siemens AG. Other designations in this manual might be trade­marks whose use by third parties for their own purposes would in­fringe the rights of the owner.

Siemens Aktiengesellschaft Order no.: E50417-G1140-C474-A1

Preface

Purpose of this Manual

This manual describes the functions, operation, installation, and placing into service of device 7SD80. In par­ticular:

• Information regarding the configuration of the scope of the device and a description of the device functions
and settings → Chapter 2;

• Instructions for Installation and Commissioning → Chapter 3;

• Compilation of the Technical Data → Chapter 4;

• As well as a compilation of the most significant data for advanced users → Appendix A.

General information with regard to design, configuration, and operation of SIPROTEC 4 devices are set out in
the SIPROTEC 4 System Description /1/.

T arget Audience

Protection engineers, commissioning engineers, personnel concerned with adjustment, checking, and service
of selective protective equipment, automatic and control facilities, and personnel of electrical facilities and
power plants.

Applicability of this Manual

This manual applies to: SIPROTEC 4 Line Differential Protection 7SD80; firmware version V4.6.

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 2004/108/EC) and concerning electrical equipment for use within specified
voltage limits (Low-voltage Directive 2006/95 EC).
This conformity is proved by tests conducted by Siemens AG in accordance with the Council
Directive in agreement with the generic standards EN 61000-6-2 and EN 61000-6-4 for EMC
directive, and with the standard EN 60255-27 for the low-voltage directive.
The device has been designed and produced for industrial use.
The product conforms with the international standards of the series IEC 60255 and the German
standard VDE 0435.

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Preface

Additional St andards IEEE C37.90 (see Chapter 4 "Technical Data")

This product is UL certified according to the Technical Data.
file E194016

UL certification according to standard UL 508 for the devices 7SD803x and 7SD807x has
been applied for.

Additional Support

Should further information on the System SIPROTEC 4 be desired or should particular problems arise which
are not covered sufficiently for the purchaser's purpose, the matter should be referred to the local Siemens rep­resentative.

Our Customer Support Center provides a 24-hour service.
Telephone: [phone]
Fax: [phone]
e-mail: [e-mail]

Training Courses

Inquiries regarding individual training courses should be addressed to our Training Center:
Siemens AG
Siemens Power Academy
Humboldt Street 59
90459 Nuremberg
Telefon: [phone]
Fax: [phone]
Internet: www.siemens.com/energy/power-academy
e-mail: [e-mail]

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Safety Information

This manual does not constitute a complete index of all required safety measures for operation of the equip­ment (module, device), as special operational conditions may require additional measures. However, it com­prises important information that should be noted for purposes of personal safety as well as avoiding material
damage. Information that is highlighted by means of a warning triangle and according to the degree of danger,
is illustrated as follows.

DANGER!

Danger indicates that death, severe personal injury or substantial material damage will result if proper precau­tions are not taken.

WARNING!

indicates that death, severe personal injury or substantial property damage may result if proper precautions are
not taken.

Caution!

indicates that minor personal injury or property damage may result if proper precautions are not taken. This
particularly applies to damage to or within the device itself and consequential damage thereof.

Preface

Note

indicates information on the device, handling of the device, or the respective part of the instruction manual
which is important to be noted.

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Preface

WARNING!

Qualified Personnel

Commissioning and operation of the equipment (module, device) as set out in this manual may only be carried
out by qualified personnel. Qualified personnel in terms of the technical safety information as set out in this
manual are persons who are authorized to commission, activate, to ground and to designate devices, systems
and electrical circuits in accordance with the safety standards.

Use as prescribed
The operational equipment (device, module) may only be used for such applications as set out in the catalog

and the technical description, and only in combination with third-party equipment recommended or approved
by Siemens.

The successful and safe operation of the device is dependent on proper handling, storage, installation, opera­tion, and maintenance.

When operating an electrical equipment, certain parts of the device are inevitably subject to dangerous voltage.
Severe personal injury or property damage may result if the device is not handled properly.

Before any connections are made, the device must be grounded to the ground terminal.
All circuit components connected to the voltage supply may be subject to dangerous voltage.
Dangerous voltage may be present in the device even after the power supply voltage has been removed (ca-

pacitors can still be charged).
Operational equipment with exposed current transformer circuits may not be operated.
The limit values as specified in this manual or in the operating instructions may not be exceeded. This aspect

must also be observed during testing and commissioning.

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T ypographic and Symbol Conventions

The following text formats are used when literal information from the device or to the device appear in the text
flow:

Parameter Names

Designators of configuration or function parameters which may appear word-for-word in the display of the
device or on the screen of a personal computer (with operation software DIGSI), are marked in bold letters in
monospace type style. The same goes for the titles of menus.

1234A

Parameter addresses have the same character style as parameter names. Parameter addresses contain the
suffix A in the overview tables if the parameter can only be set in DIGSI via the option Display additional set-
tings.

Parameter Options

Possible settings of text parameters, which may appear word-for-word in the display of the device or on the
screen of a personal computer (with operation software DIGSI), are additionally written in italics. This also
applies to header bars for selection menus.

„Messages“

Designators for information, which may be output by the relay or required from other devices or from the switch
gear, are marked in a monospace type style in quotation marks.

Preface

Deviations may be permitted in drawings and tables when the type of designator can be obviously derived from
the illustration.

The following symbols are used in drawings:

Device-internal logical input signal

Device-internal logical output signal

Internal input signal of an analog quantity
External binary input signal with number (binary input,

input indication)
External binary input signal with number

(example of a value indication)
External binary output signal with number (device indication) used as

input signal

Example of a parameter switch designated FUNCTION with address
1234 and the possible settings ON and OFF

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Preface

Besides these, graphical symbols are used according to IEC 60617-12 and IEC 60617-13 or symbols derived
from these standards. Some of the most frequently used are listed below:

Analog input variable

AND operation of input variables

OR operation of input variables

Exclusive OR (antivalence): output is active if only one of the inputs is
active

Coincidence: output is active if both inputs are active or inactive at the
same time

Dynamic input signals (edge-triggered) above with positive, below with
negative edge

Formation of one analog output signal from a number of analog input
signals

Threshold element with setting address and parameter names

Timer (pickup delay T adjustable) with setting address and parameter
names

Timer (dropout delay T not adjustable)

Edge-triggered time element with action time T

Static memory (SR flipflop) with setting input (S), resetting input (R),
output (Q) and inverted output (Q

), setting input dominant

Static memory (RS-flipflop) with resetting input (R) setting input (S),
output (Q) and inverted output (Q

), resetting input dominant

■

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Contents

1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

1.1 Overall Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

1.2 Application Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

1.3 Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

2 Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

2.1.1 Functional Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

2.1.1.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

2.1.1.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

2.1.1.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

2.1.2 Device, General Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

2.1.2.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

2.1.2.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

2.1.2.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

2.1.2.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

2.1.3 General Power System Data (Power System Data 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

2.1.3.1 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

2.1.3.2 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

2.1.4 Oscillographic Fault Records. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

2.1.4.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

2.1.4.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

2.1.4.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2

2.1.4.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

2.1.5 Change Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

2.1.5.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

2.1.5.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

2.1.5.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3

2.1.5.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

2.1.6 General Protection Data (Power System Data 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

2.1.6.1 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

2.1.6.2 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 7

2.1.6.3 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

2.1.7 EN100-Modul 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

2.1.7.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

2.1.7.2 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

2.1.8 Protection Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

2.1.8.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

2.1.8.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

2.1.8.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1

2.1.8.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

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Contents

2.2 Phase Comparison Protection and Ground Differential Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . .52

2.2.1 Differential Topol ogy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

2.2.1.1 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

2.2.1.2 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

2.2.1.3 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

2.2.2 Phase Comparison Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

2.2.2.1 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

2.2.2.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

2.2.3 Ground Current Differential Protection in Grounded Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

2.2.3.1 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

2.2.3.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

2.2.4 Ground Fault Differential Protection in Resonant-grounded/Isolated Systems. . . . . . . . . . . . . . . .63

2.2.4.1 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

2.2.4.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

2.2.5 Differential Protection Pickup Logic and Tripping Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

2.2.5.1 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

2.2.6 87 Differential Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

2.2.6.1 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

2.2.6.2 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

2.2.7 Differential Protection Test and Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

2.2.7.1 Differential Protection Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

2.2.7.2 Differential Protection Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

2.3 Breaker Intertrip and Remote Tripping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

2.3.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

2.3.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76

2.3.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

2.3.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

2.4 Backup Overcurrent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

2.4.1 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

2.4.2 Non-directional Overcurrent Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

2.4.3 Directional Overcurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

2.4.4 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

2.4.5 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

2.4.6 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

2.5 Inrush Restraint. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

2.5.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

2.5.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99

2.5.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100

2.5.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100

2.6 Circuit-Breaker Failure Protection 50BF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101

2.6.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101

2.6.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108

2.6.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

2.6.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

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2.7 Thermal Overload Protection 49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112

2.7.1 Method of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112

2.7.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113

2.7.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115

2.7.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115

2.8 Undervoltage and Overvoltage Protection 27/59 (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .116

2.8.1 Overvoltage Protection (ANSI 59) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .116

2.8.2 Undervoltage Protection (ANSI 27) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121

2.8.3 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124

2.8.4 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .128

2.8.5 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130

2.9 Frequency Protection 81 (Optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133

2.9.1 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133

2.9.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136

2.9.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .137

2.9.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138

2.10 Direct Local Trip. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139

2.10.1 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139

2.10.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140

2.10.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140

2.10.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140

2.11 Automatic Reclosure Function 79 (Optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141

2.11.1 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141

2.11.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148

2.11.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152

2.11.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .154

2.12 Circuit-Breaker Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .155

2.12.1 CB Close Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .155

2.12.2 Circuit-Breaker Position Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .158

2.12.3 Circuit-Breaker Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .159

2.12.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .160

2.13 Direct Remote Trip and Transmission of Binary Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161

2.13.1 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161

2.13.2 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162

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2.14 Monitoring Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

2.14.1 Measurement Supervision. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163

2.14.1.1 Hardware Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163

2.14.1.2 Software Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165

2.14.1.3 External Transformer Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165

2.14.1.4 Fault Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

2.14.1.5 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

2.14.1.6 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

2.14.1.7 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .178

2.14.2 74TC Trip Circuit Supervision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

2.14.2.1 Method of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .179

2.14.2.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

2.14.2.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

2.14.2.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182

2.15 Flexible Protection Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183

2.15.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183

2.15.2 Setting Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .187

2.15.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191

2.15.4 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .193

2.16 Function Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

2.16.1 Pickup Logic for the Entire Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .194

2.16.2 Overall Tripping Logic of the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

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2.17 Additional Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .199

2.17.1 Indications Processing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .199

2.17.1.1 LEDs and Binary Outputs (Output Relays). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .199

2.17.1.2 Information via Display Fi e ld or PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200

2.17.1.3 Information to a Control Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .201

2.17.2 Statistics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .201

2.17.2.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .202

2.17.2.2 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .202

2.17.3 Measurement During Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .203

2.17.3.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .203

2.17.3.2 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205

2.17.4 Differential Protection Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206

2.17.4.1 Measured Values of the Differential Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206

2.17.4.2 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206

2.17.5 Constellation Measured Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206

2.17.5.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206

2.17.6 Min/Max Measurement Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207

2.17.6.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207

2.17.6.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207

2.17.6.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .208

2.17.6.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .208

2.17.7 Demand Measurement Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .210

2.17.7.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .210

2.17.7.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .210

2.17.7.3 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .210

2.17.7.4 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .211

2.17.8 Set Points (Measured Values) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .212

2.17.8.1 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .212

2.17.8.2 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .212

2.17.9 Energy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .213

2.17.9.1 Energy Metering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .213

2.17.9.2 Setting Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .213

2.17.9.3 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .213

2.18 Breaker Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214

2.18.1 Control Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214

2.18.1.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214

2.18.1.2 Information List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .215

2.18.2 Command Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .216

2.18.2.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . .216

2.18.3 Command Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .217

2.18.3.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .217

2.18.4 Switchgear Interlocking Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218

2.18.4.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218

2.18.5 Command Logging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .228

2.18.5.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .228

2.19 Notes on Device Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .229

2.19.1 Different operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .229

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3 Mounting and Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231

3.1 Mounting and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232

3.1.1 Configuration Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232

3.1.2 Hardware Modifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

3.1.2.1 Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

3.1.2.2 Connections of the Current Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .241

3.1.2.3 Connections of the Voltage Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .243

3.1.2.4 Interface Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .244

3.1.2.5 Reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .247

3.1.3 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .248

3.1.3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

3.1.3.2 Panel Flush Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

3.1.3.3 Cubicle Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .250

3.1.3.4 Panel Surface Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .251

3.2 Checking Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .252

3.2.1 Checking the Data Connections of the Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .252

3.2.2 Checking the Protection Data Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .255

3.2.3 Checking the System Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256

3.3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .258

3.3.1 Test Mode and Transmission Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .259

3.3.2 Checking Time Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .259

3.3.3 Testing the System Interface (at Port B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .260

3.3.4 Configuring Communication Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .262

3.3.5 Checking the Status of Binary Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265

3.3.6 Checking the Protection Data Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .268

3.3.7 Tests for Circuit-Breaker Failure Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270

3.3.8 Checking the Instrument Transformer Connections of One Line End. . . . . . . . . . . . . . . . . . . . . .272

3.3.9 Checking the Instrument Transformer Connections of Two Line Ends . . . . . . . . . . . . . . . . . . . . . 277

3.3.10 Checking the Pilot Protection for Internal and External Remote Tripping . . . . . . . . . . . . . . . . . . .277

3.3.11 Testing User-defined Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .277

3.3.12 Trip and Close Test with the Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .278

3.3.13 Switching Check for the Configured Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .278

3.3.14 Triggering Oscillographic Recording for Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

3.4 Final Preparation of the Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .280

4 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .281

4.1 General Device Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

4.1.1 Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

4.1.2 Auxiliary Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

4.1.3 Binary Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 84

4.1.4 Communication Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .285

4.1.5 Electrical Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .288

4.1.6 Mechanical Stress Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .290

4.1.7 Climatic Stress Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290

4.1.8 Service Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .291

4.1.9 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .291

4.1.10 UL certification conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .292

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4.2 Protection interfaces and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .293

4.3 87 Differential Protection Phase Comparison Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .296

4.4 Ground Fault Differential Protection in Grounded Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .299

4.5 Ground Fault Differential Protection in Resonant-grounded / Isolated Systems . . . . . . . . . . . . . . . . .300

4.6 Breaker Intertrip and Remote Tripping- Direct Local Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .301

4.7 Time Overcurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .302

4.8 Inrush Current Restraint Breaker Intertrip and Remote Tripping. . . . . . . . . . . . . . . . . . . . . . . . . . . . .309

4.9 Circuit-Breaker Failure Protection (Optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .310

4.10 Thermal Overload Protection 49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .311

4.11 Voltage Protection (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .313

4.12 Frequency Protection (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .316

4.13 Automatic Reclosing (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .317

4.14 Transmission of Binary Information and Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .318

4.15 Monitoring Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .319

4.16 Flexible Protection Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .321

4.17 User-defined Functions (CFC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .324

4.18 Additional Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .328

4.19 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .330

4.19.1 Panel Flush Mounting and Cabinet Flush Mounting (H ousing Size 1/6) . . . . . . . . . . . . . . . . . . . .330

4.19.2 Panel Surface Mounting (Housing Size 1/6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .331

4.19.3 Bottom View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .332

A Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .333

A.1 Ordering Information and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .334

A.1.1 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334

A.1.1.1 7SD80 V4.6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .334

A.1.2 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .337

A.2 Terminal Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .339

A.2.1 7SD80 — Housing for Panel Flush Mounting and Cabinet Flush Mounting and

for Panel Surface Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .339

A.3 Connection Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .345

A.4 Current Transformer Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .348

A.4.1 Current Transformer Ratio: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .348

A.4.2 Overcurrent Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .348

A.4.3 Class Conversion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .349

A.4.4 Core Balance Current Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .349

General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .349

Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .349

Class Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .350

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Contents

A.5 Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .351

A.5.1 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .351

A.5.2 Binary Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .351

A.5.3 Binary Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .352

A.5.4 Function Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .352

A.5.5 Default Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353

A.5.6 Pre-defined CFC Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356

A.6 Protocol-dependent Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357

A.7 Functional Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .358

A.8 Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .360

A.9 Information List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .371

A.10 Group Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393

A.11 Measured Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .394

Literature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .399

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413

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Introduction 1

This chapter introduces the SIPROTEC 4 7SD80 and gives an overview of the device's application, properties
and functions.

1.1 Overall Operation 18

1.2 Application Scope 21

1.3 Characteristics 23

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Introduction

1.1 Overall Operation

1.1 Overall Operation

The digital SIPROTEC 7SD80 overcurrent protection is equipped with a powerful microprocessor. It allows all
tasks to be processed digitally, from the acquisition of measured quantities to sending commands to circuit
breakers. Figure 1-1 shows the basic structure of the 7SD80 device.

Analog Inputs

The measuring inputs (MI) convert the currents and voltages coming from the instrument transformers and
adapt them to the level appropriate for the internal processing of the device. The device provides 4 current
transformers and - depending on the model - additionally 3 voltage transformers. Three current inputs serve for
the input of the phase currents, another current input (I

I

(current transformer starpoint) or for a separate ground current transformer (for sensitive ground fault detec-

N

tion I

and directional determination of ground faults) - depending on the model.

Ns

) may be used for measuring the ground fault current

N

18

Figure 1-1 Hardware structure of the 7SD80 differential protection

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There is one voltage input available for each phase-to-ground voltage. The differential protection does not need
measuring voltages due to its functional principle. Directional overcurrent protection, however, requires the
phase-to-ground voltage V
displaying voltages and power values and also measuring the line voltage for automatic reclosing. The analog
quantities are forwarded to the input amplifier group (IA).

The input amplifier group IA provides high-resistance termination for the analog input quantities. It consists of
filters that are optimized for measured value processing with regard to bandwidth and processing speed.

The analog-to-digital (AD) element consists of an analog-to-digital (A/D) converter and memory components
for data transmission to the microcomputer system.

Microcomputer System

Apart from processing the measured values, the microcomputer system µC also executes the actual protection
and control functions. They especially consist of:

• Filtering and preparation of the measured quantities

• Continuous monitoring of the measured quantities

• Monitoring of the pickup conditions for the individual protection functions

• Interrogation of limit values and time sequences

• Control of signals for the logic functions

• Decision on trip and close commands

• Recording of messages, fault data and fault values for analysis

• Administration of the operating system and its functions, e.g. data storage, realtime clock, communication,
interfaces, etc.

• Formation of the local differential protection values (phasor analysis and charge current computation) and
creation of the transmission protocol

• Decoding the received transmission protocol, synchronization of differential protection values and totaling
the differential currents and charge currents

• Monitoring the communication with the device of the remote en d

Introduction

1.1 Overall Operation

, VB and VC to be connected. Additionally, voltages can be connected that allow

A

The information is provided via output amplifier OA.

Binary Inputs and Outputs

Binary inputs and outputs to and from the computer system are relayed via the input/output modules. The com­puter system obtains information from the system (e.g. remote resetting) or from other devices (e.g. blocking
commands). Outputs are, in particular, commands to the switchgear units and annunciations for remote signal­ing of important events and statuses.

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Introduction

1.1 Overall Operation

Front Elements

Information such as messages related to events, states, measured values and the functional status of the
device are visualized by light-emitting diodes (LEDs) and a display screen (LCD) on the front panel.

Integrated control and numeric keys in conjunction with the LCD enable communication with the remote device.
These elements enable the user to retrieve all device information such as configuration and setting parameters,
operational indications and fault indications or measured values and to edit setting parameters.

In addition, control of circuit breakers and other equipment is possible from the front panel of the device.

Interfaces

Communication with a PC can be implemented via the USB DIGSI interface using the DIGSI software allowing
the user to conveniently handle all device functions.

Port A can be used as protection interface to communicate with another 7SD80 device via an optical fiber
cable.

If you are using a copper link to create a connection to the other 7SD80 device, use the voltage terminals D1
and D2 as protection interface.

The protection data interfaces are used to transfer the data of the measured quantities from each end of the
protected zone to the opposite end. Further information such as closing of the local circuit breaker or other ex­ternally injected trip commands can be transmitted to the opposite end via the protection interface.

In addition to the device communication via DIGSI, port B can also be used to transmit all device data to a
central evaluator or a control center. This interface may be provided with various protocols and physical trans­mission schemes to suit the particular application.

Power Supply

The functional units described are supplied by a power supply (PS) with the adequate power in the different
voltage levels. Transient voltage dips may occur if the auxiliary voltage supply system becomes short-circuited.
Usually, they are bridged by a capacitor storage (see also the Section 4, Technical Data).

A buffer battery is located behind the lower front cover.

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1.2 Application Scope

The digital Line Differential Protection SIPROTEC 4 7SD80 is a selective short-circuit protection for overhead
lines and cables with single- and multi-ended infeeds in radial, ring or any type of meshed systems of any trans­mission level. The measured data are compared separately for each phase.

A major advantage of the differential protection principle is the instantaneous tripping in the event of a short
circuit at any point within the entire protected zone. The current transformers limit the protected zone at the
ends towards the remaining system. This rigid delimitation is the reason why the differential protection scheme
shows such an ideal selectivity.

The differential protection system requires a 7SD80 device as well as a set of current transformers at either
end of the protected zone. Voltage transformers are not required for the differential protection functions in the
7SD80; they are, however, available to record and display measured values (voltages, power, power factor) or
when using a directional overcurrent protection element.

The devices located at the ends of the protected zone exchange measuring information via protection interfac­es using communication links (usually optical fiber or copper cables).

Since fault-free data transmission is the prerequisite for the proper operation of the protection, it is continuously
monitored internally.

Introduction

1.2 Application Scope

Protection Functions

The device's basic function is to detect short-circuits or ground faults in the protected zone – even weak-current
or high-resistance short-circuits. Even complex multiphase faults are detected correctly, as the measured
values are evaluated separately for each phase. The protection is restraint against inrush currents of power
transformers. When switching a line onto a fault, it is possible to send an instantaneous trip signal. The 7SD80
line differential protection includes the differential protection functions of phase comparison protection and
ground fault differential protection. Both differential protection functions operate independently of each other.

In the event of a communication failure, the devices can automatically switch to emergency operation using an
integrated overcurrent protection until communication is restored. The overcurrent protection comprises two
definite time-overcurrent protection elements and one inverse time-overcurrent protection element. Both ele­ments operate directional or non-directional. Additionally, the device features a third definite time-overcurrent
protection element that always operates non-directionally.

For inverse time overcurrent protection, several characteristic curves of different standards are available.
Alternatively, the time overcurrent protection can be used as a backup time overcurrent protection, i.e. it oper-

ates independent of and parallel to the differential protection at either end.
The communication link can be used for transmitting further information. Besides measured values, it is possi-

ble to transmit binary information.
All protection functions in the 7SD80 always trip 3-pole. They can work together with an integrated automatic

reclose function (optional). The automatic reclose functions enables 3-pole automatic reclosing with two
reclose attempts.

The thermal overload protection protects cables and power transformers from inadmissible heating due to over­load.

Additionally, a two-element overvoltage and undervoltage protection and a four-element frequency protection
can be used. A circuit-breaker failure protection monitors the response of the circuit breaker following a trip
command.

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Introduction

1.2 Application Scope

Control Functions

The device provides a control function which can be accomplished for activating and deactivating switchgear
via operator buttons, port B, binary inputs and - using a PC and the DIGSI software - via the front interface.

The switch positions are fed back to the device via auxiliary contacts of the circuit breakers and binary inputs.
The current switch positions can be read out at the device and used for plausibility monitoring and interlockings.
The number of the devices to be switched is limited by the binary inputs and outputs available in the device or
the binary inputs and outputs allocated for the switch position feedbacks. Depending on the equipment, one
binary input (single point indication) or two binary inputs (double point indication) can be used. The release to
switch can be restricted by appropriate settings for the switching authority (remote or local), and by the oper­ating mode (interlocked/non-interlocked, with or without password validation). Interlocking conditions for
switching (e.g. switchgear interlocking) can be defined with the help of integrated user-configurable logic func­tions.

Messages and Measured Values; Recording of Event and Fault Data

The operational indications provide information about conditions in the power system and the device. Measure­ment quantities and values that are calculated can be displayed locally and communicated via the serial inter­faces.

Device messages can be assigned to a number of LEDs on the front cover (allocatable), 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 protocols (Event Log
or Trip Log). Instantaneous fault values are also saved in the device and may be analyzed subsequently.

Communication

The following interfaces are available for communication with external operating, control and memory systems.
The USB DIGSI interface on the front cover serves for local communication with a PC. With the SIPROTEC 4

operating software DIGSI, all operation and evaluation tasks can be executed using this operator interface, for
instance specifying and editing configuration parameters and settings, configuring user-specific logic functions,
retrieving operational messages and measured values, inquiring device conditions and measured values,
issuing control commands.

Port A is located on the bottom side of the device. This protection data interface connects the device to its
partner device at the remote end of the protected object.

Alternatively, you can implement the communication link using the voltage terminals D-1 and D-2.
Port B serves for central communication between the device and a control center. It can be operated via data

lines or optical fiber cables. For the data transfer, standardized protocols according IEC 60870-5-103 are avail­able. The integration of the devices into the SINAUT LSA and SICAM automation systems can also be imple­mented with this profile.

Alternatively, there are additional connection options available in connection with PROFIBUS DP and the
DNP3.0 and MODBUS protocols. If an EN100 module is available, it is also possible to use the IEC61850 pro­tocol.

You can also use port B to connect a time synchronization device such as DCF77 or IRIG-B.

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1.3 Characteristics

General Properties

• Powerful 32-bit microprocessor system

• Complete digital processing of measured values and control, from the sampling of the analog input values,
the processing and organization of the communication between devices up to the closing and tripping com­mands to the circuit breakers.

• Total galvani c and fail-safe separation of the internal processing circuits from the measuring, control and
supply circuits of the system via measuring transformers, binary input and output modules and DC or AC
converters

• Suited for lines with two ends, even with transformers in the protected zone

• Easy device operation using the integrated operator panel or from a connected personal computer running
DIGSI

• Storage of fault indications as well as instantaneous values for fault recording

• Digital protection data transmission; communication of the device through optical fiber cables

• Communication is possible via a single copper wire pair (typically 8 km (4.97 miles), max. 20 km
(12.43 miles), depending on the used cable type, see Section 4, Technical Data).

Introduction

1.3 Characteristics

• Permanent supervision of the protection data transmission for disturbance, failure or transfer time variations

Phase Comparison Protection

• Differential protection for two ends with digital protection data transmission

• Protection for all types of short-circuits in systems with any starpoint conditioning

• Reliable distinction between load and short-circuit conditions using adaptive measureme nt methods, also
for high-resistance faults with small fault currents

• High sensitivity in light load operation, highest stability against load steps and power fluctuations

• Due to phase segregated measurement, the pickup sensitivity is independent of the fault type

• Suited for feeder transformers in the protected zone

• Detection of high-resistance, weak-current faults due to high sensitivity of the protection functions

• Fast tripping also on weak or zero infeed ends (breaker intertrip)

• No frequency dependency

Ground Fault Differential Protection for Grounded Systems

• Short command time

• High sensitivity for short circuits to ground

• High stability against external ground faults by stabilizing the through-flowing ground current

Ground Fault Differential Protection for Isolated / Grounded Systems

• Short command time

• High sensitivity for short circuits to ground

• High stability against external short-circuits to ground using the magnitude and phase relationship of the
ground current flowing through for stabilization

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Introduction

1.3 Characteristics

External Direct and Remote T ripping

• Tripping of the local end by an external device via binary input

• Tripping of the opposite end by local protection functions or by an external device via binary input

Time Overcurrent Protection

• Optionally selectable as emergency function during protection data communication failure or as backup
function or both

• A maximum of 3 definite time elements and one inverse time element, each for phase currents and ground
current

• A maximum of 2 directional definite time elements and one directional inverse time element, each for phase
currents and ground current

• For inverse time overcurrent protection, selection from various characteristics of different standards possible

• Blocking options e.g. for reverse interlocking with any element

• Instantaneous tripping when closing onto a short circuit possible with any element

Inrush Current Restraint

• Insensitive to inrush currents, even in the case of feeder transformers in the protected zone, and against
higher-frequency transients

• High stability also for different current transformer saturation

Circuit-Breaker Failure Protection

• With independent current elements for the monitoring of the current flow through each pole of the circuit
breaker

• Separate pickup thresholds for phase and ground currents

• Monitoring time element for tripping

• Initiation by the trip command of each integrated protection function

• Initiation by external trip functions possible

• Single-element or two-element

• No dropout and seal-in times

Thermal Overload Protection

• Thermal replica of the current heat losses of the protected object

• RMS measurement for all three phase currents

• Adjustable thermal and current-dependent warning elements

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Vo ltage Protection

• Overvoltage and undervoltage detection with different elements

• Two overvoltage elements for the phase-to-ground voltages

• Two overvoltage elements for the phase-to-phase voltages

• Two overvoltage elements for the positive sequence voltage

• Two overvoltage elements for the negative sequence system of the voltages

• Two overvoltage elements for the zero system of the voltages or for any other single-phase voltage

• Adjustable dropout conditions

• Two undervoltage elements for the phase-to-ground voltages

• Two undervoltage elements for the phase-to-phase voltages

• Two undervoltage elements for the positive sequence system of the voltages

• Adjustable current criterion for undervoltage protection functions

Frequency Protection 81 (Optional)

• Monitoring of falling below (f<) and/or exceeding (f>) with 4 frequency limits and time delays that are inde­pendently adjustable

Introduction

1.3 Characteristics

• Particularly insensitive to harmonics and abrupt phase angle changes

• Wide frequency range (approx. 25 Hz to 70 Hz)

Automatic Reclose Function (Optional)

• For reclosing after 3-pole open condition

• Two recl o si n g attempts

• With separate action times for each reclosing attempt, optionally without action times

• With separate dead times

• Optionally controlled by protection element pickup with separate dead times after 1-pole, 2-pole or 3-pole
pickup

Monitoring Functions

• Reliability of the device is greatly increased because of self-monitoring of the internal measurement circuits,
the auxiliary power supply as well as the hardware and software

• Monitoring of the current transformer and voltage transformer secondary circuits using summation and sym­metry check techniques

• Monitoring of communication with statistics showing the availability of transmission telegrams

• Check of the consistency of protection settings at both line ends: no processor system start-up with incon­sistent settings which could lead to a malfunction of the differential protection system

• Trip circuit monitoring possible

• Check of local and remote measured values and comparison of both

• Broken wire supervision for the secondary CT circuits with fast phase segregated blocking of the differential
protection system in order to avoid malfunction

• Supervision of measuring voltage failure using "Fuse Failure Monitor"

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Introduction

1.3 Characteristics

Flexible Protection Functions

• Up to 20 customizable protection functi ons with 3-phase or 1-phase operation

• Any calculated or directly measured variable can theoretically be evaluated

• Standard protection logic with a constant (i.e. definite time) characteristic curve

• Internal and configurable pickup and dropout delay

• Editable indication texts

User-defined Logic Functions (CFC)

• Internal and external signals can be logically combined to realize user-defined logic functions

• All common logic functions

• Time delays and limit value interrogations

Command Processing

• Switching devices can be opened and closed manually using control keys, programmable function keys, via
port B (e.g. of SICAM or SCADA), or via the user interface (using a personal computer and the DIGSI oper­ating software)

• Feedback of the circuit-breaker states via the breaker auxiliary contacts (for commands with feedback)

• Plausibility monitoring of the circuit-breaker positions and interlocking conditions.

Commissioning; Operation; Maintena nce

• Indication of the local and remote measured values according to magnitude and phase angle

• Indication of the calculated differential and restraint currents

• Indication of the measured values of the communication connection, as runtime and availability

Additional Functions

• Battery-buffered clock which can be synchronized via a synchronization signal (DCF77, IRIGB via satellite
receiver), binary input or system interface

• Continuous calculation and indication of operational measured values on the front display, indication of mea­sured values of the far end or all ends (for devices with active interfaces)

• Fault event memory (trip log) for the last eight network faults (faults in the power system), with real time
stamps

• Fault recording and data transfer for fault recording for a maximum time range of 15 seconds.

• Switching statistics: Counting of the trip and close commands initiated by the device as well as recording of
the short-circuit data and accumulation of the disconnected fault currents

• Communication with central control and memory components via serial interfaces possible (depending on
the ordered variant), optionally via RS232, RS485 connection, modem or fiber optic cable

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• Commissioning aids such as connection check, direction check and circuit-breaker check

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Functions 2

This chapter describes the numerous functions available on the SIPROTEC 4 device 7SD80. It shows the
setting possibilities for each function in maximum configuration. Information with regard to the determination of
setting values as well as formulas, if required, are also provided.

Based on the following information, it can also be determined which of the provided functions should be used.

2.1 General 28

2.2 Phase Comparison Protection and Ground Differential Protection 52

2.3 Breaker Intertrip and Remote Tripping 75

2.4 Backup Overcurrent 78

2.5 Inrush Restraint 98

2.6 Circuit-Breaker Failure Protection 50BF 101

2.7 Thermal Overload Protection 49 112

2.8 Undervoltage and Overvoltage Protection 27/59 (Optional) 116

2.9 Frequency Protection 81 (Optional) 133

2.10 Direct Local Trip 139

2.1 1 Automatic Reclosure Function 79 (Optional) 141

2.12 Circuit-Breaker Test 155

2.13 Direct Remote Trip and Transmission of Binary Information 161

2.14 Monitoring Functions 163

2.15 Flexible Protection Functions 183

2.16 Function Control 194

2.17 Additional Functions 199

2.18 Breaker Control 214

2.19 Notes on Device Operation 229

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Functions

2.1 General

2.1 General

You can edit the function parameters via the user interface or service interface from a PC runni ng th e D IGSI
software; some parameters can also be changed using the controls at the front panel of the device. The pro­cedure is set out in detail in the SIPROTEC 4 System Description /1/.

2.1.1 Functional Scope

The 7SD80 relay comprises protection functions and additional functions. The hardware and firmware are de­signed for this scope of functions. Additionally, the control functions can be matched to the system require­ments. Individual functions can be activated or deactivated during the configuration procedure or the interaction
of functions be modified.

2.1.1.1 Description

Setting the Scope of Functions

Example for the configuration of the scope of functions:
A system consists of overhead lines and underground cables. Since automatic reclosing is only needed for the

overhead lines, the automatic reclosing function is disabled for the relays protecting the underground cables.
The available protection functions and additional functions can be configured as Enabled or Disabled. For

some functions, there is a choice between several alternatives possible, as described below.
Functions configured as Disabled are not processed in the 7SD80. There are no messages issued and the

corresponding settings (functions, limit values) are not queried during configuration.

Note

Available functions and default settings depend on the ordered variant of the relay (see A.1 for details).

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2.1.1.2 Setting Notes

Setting the Scope of Functions

Your protection device is configured using the DIGSI software. Connect your personal computer either to the
USB port on the device front or to port B on the bottom side of the device depending on the device version
(ordering code). The operation via DIGSI is explained in the SIPROTEC 4 System Description.

The Device Configuration dialog box allows you to adjust your device to the prevailing system conditions.
Password no. 7 is required (for parameter set) to change configuration parameters in the device. Without the

password you can only read the settings but not edit and transmit them to the device.

Special Settings

Most settings are self-explaining. The special cases are described in the following.
If you want to use the setting group change function, set address 103 Grp Chge OPTION to Enabled. In this

case, you can select up to four different groups of function parameters between which you can switch quickly
and conveniently during operation. Only one setting group can be used when selecting the option Disabled.

The differential protection function 87 DIFF.PROTEC. (address 112) as a main function of the device should
always be Enabled. This also applies to the supplementary functions of the differential protection such as
breaker intertrip.

Functions

2.1 General

The external trip initiation (address 122 DTT Direct Trip) is a command that is initiated from an external
device for tripping the local circuit breaker.

At address 126 Back-Up O/C, you can set the characteristic group which the time overcurrent protection uses
for operation. In addition to the definite-time overcurrent protection an inverse-time overcurrent protection can
be configured that either operates according to an IEC characteristic (50(N) 51(N) IEC) or to an ANSI char­acteristic (50(N) 51(N)ANSI). This selection is independent of whether the time overcurrent protection is in­tended to operate as emergency protection (only in case of protection communication failure) or as indepen­dent backup protection. Device versions equipped with directional overcurrent protection (MLFB position 14 =
R or S) additionally provide a directional definite time overcurrent protection element and a directional inverse
time overcurrent protection element. The characteristic curves of the two inverse time overcurrent protection
elements are identical. The different characteristic curves are shown in the Technical Data (Section 4.6). You
can also disable the time overcurrent protection (Disabled).

Set to Disabled, the entire time overcurrent protection can be disabled.
For overload protection you can define in address 142 49 whether the function is to be Enabled or Disabled.
In address 139 you can set the breaker failure protection to Enabled or Disabled. The setting option

enabled w/ 3I0> subjects the ground current and the negative sequence current to a plausibility check.
If the device features an automatic reclosing function, address

133 and 134 are of importance. Automatic re­closure is only permitted for overhead lines. It must not be used in any other case. If the protected object con­sists of a combination of overhead lines and other equipment (e.g. overhead line in unit with a transformer or
overhead line/cable), reclosing is only permissible if it is ensured that reclosing will only be performed in the
event of a fault on the overhead line. If no automatic reclosing function is desired for the feeder at which 7SD80
operates, or if an external device is used for reclosure, set address 133 79 Auto Recl. to Disabled. Or
you can enter the number of desired reclosing attempts there. Y ou can select 1 AR-cycle or 2 AR-cycles.

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Functions

2.1 General

The AR control mode at address 134 allows a maximum of four options. On the one hand, it can be deter­mined whether the automatic reclosure cycles are carried out according to the fault type detected by the pickup
of the starting protective function(s) or according to the type of trip command. On the other hand, the auto­matic reclosing function can be operated with or without action time.

The setting Trip ... (with trip command ..., default setting) allows you to specify different dead times for each
automatic reclose cycle.

The setting Pickup ... (with pickup ...) allows you to enter different dead times for the automatic reclose
cycles for 1

-phase, 2-phase and 3-phase short circuits. The pickup status of the protection functions at the
instant the trip command disappears is decisive here. This operating mode enables making the dead times de­pendent on the type of fault also for three-pole reclosure cycles. Tripping is always three-pole.

The setting ... w/ Tact (with ... action time) provides an action time for each automatic reclose cycle. The
action time is started by a general pickup of all protection functions. If there is no trip command yet when the
action time has expired, the corresponding automatic reclosure cycle cannot be executed. Section 2.11 pro­vides detailed information on this topic. For time graded protection this setting is recommended. If the protec­tion function which is to operate with automatic reclosure does not have a general pickup signal for starting the
action times, select ... w/o Tact (without action time).

Address 137 27/59 allows activating the voltage protection function with a variety of undervoltage and over­voltage protection elements.

For the trip circuit supervision enter the number of trip circuits to be monitored at address 140 74 Trip Ct
Supv: 1 trip circuit, 2 trip circuits or 3 trip circuits, unless you omit it (Disabled).

If the device is connected to voltage transformers, specify this condition in address 144 V-TRANSFORMER. The
voltage-based functions, for instance the directional overcurrent protection elements, the ground fault differen­tial protection in resonant-grounded/isolated systems or determination of the voltage-based measured values,
can only be activated if voltage transformers are connected.

The flexible protection functions can be configured via parameter FLEXIBLE FUNC.. You can create up to 20
flexible functions by setting a checkm ark in front of the desired function. If the checkmark of a function is re­moved, all settings and configurations made previously will be lost. After re-selecting the function, all settings
and configurations are in default setting. The flexible function can be configured in DIGSI at „ Settings“, „Addi­tional Functions“ and „Settings“. The routing is done, as usual, under „Settings“ and „Masking I/O“. If you want
to use the flexible protection function, the device must be connected to voltage transformers.

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