Measuring relays and protection equipment - Part 187-1: Functional requirements for differential protection - Restrained and unrestrained differential protection of motors, generators and transformers

IEC 60255-187-1:2021 specifies the minimum requirements for functional and performance evaluation of (longitudinal) differential protection designed for the detection of faults in ac motors, generators and transformers. This document also defines how to document and publish performance test results. This document defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions. The test methodologies for verifying performance characteristics and accuracy are also included in this document. This document, together with IEC 60255-187-2 and IEC 60255-187-3, cancels and replaces IEC 60255-13. This document includes the following significant technical changes with respect to IEC 60255-13: a) IEC 60255-13 has been significantly revised to follow the common structure of the functional standards for protection relays (IEC 60255-1xx series). IEC 60255-187-1 has been developed to address the restrained and unrestrained differential protection of motors, generators and transformers. The revisions include detailed description of the functions including the performance specification, testing and documentation requirements.

Messrelais und Schutzeinrichtungen - Teil 187-1: Funktionsanforderungen für den stabilisierten und nicht stabilisierten Differentialschutz von Motoren, Generatoren und Transformatoren

Relais de mesure et dispositifs de protection - Partie 187-1: Exigences fonctionnelles pour la protection différentielle - Protection différentielle avec et sans caractéristique de retenue des moteurs, générateurs et transformateurs

IEC 60255-187-1:2021 spécifie les exigences minimales relatives à l'évaluation fonctionnelle et à l’évaluation de la performance de la protection différentielle (longitudinale) conçue pour la détection des défauts dans les moteurs à courant alternatif, les générateurs et les transformateurs. Le présent document définit également comment documenter et publier les résultats des essais de performance.Le présent document définit les facteurs d'influence qui affectent la précision en état stable et les caractéristiques de performance dans des conditions dynamiques. Les méthodologies d’essai permettant de vérifier les caractéristiques de performance et la précision sont également incluses dans le présent document. Le présent document, ainsi que l’IEC 60255-187-2 et l’IEC 60255-187-3, annule et remplace l’IEC 60255-13. Le présent document inclut les modifications techniques majeures suivantes par rapport à l'IEC 60255‑13: a. L’IEC 60255-13 a été considérablement révisée pour suivre la structure commune des normes fonctionnelles pour les relais de protection (série IEC 60255-1xx). L’IEC 60255-187-1 a été développée pour traiter la protection différentielle avec et sans caractéristique de retenue des moteurs, générateurs et transformateurs. Les révisions comprennent une description détaillée des fonctions, y compris les spécifications de performance, les essais et les exigences en matière de documentation.

Merilni releji in zaščitna oprema - 187-1. del: Funkcijske zahteve za diferenčno zaščito - Omejena in neomejena diferenčna zaščita motorjev, generatorjev in transformatorjev

General Information

Status
Published
Publication Date
11-Oct-2021
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
24-Sep-2021
Due Date
29-Nov-2021
Completion Date
12-Oct-2021

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SLOVENSKI STANDARD
SIST EN 60255-187-1:2021
01-november-2021
Merilni releji in zaščitna oprema - 187-1. del: Funkcijske zahteve za diferenčno
zaščito - Omejena in neomejena diferenčna zaščita motorjev, generatorjev in
transformatorjev

Measuring relays and protection equipment - Part 187-1: Functional requirements for

differential protection - Restrained and unrestrained differential protection of motors,

generators and transformers
Ta slovenski standard je istoveten z: EN IEC 60255-187-1:2021
ICS:
29.120.70 Releji Relays
SIST EN 60255-187-1:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60255-187-1:2021
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SIST EN 60255-187-1:2021
EUROPEAN STANDARD EN IEC 60255-187-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2021
ICS 29.120.70
English Version
Measuring relays and protection equipment - Part 187-1:
Functional requirements for differential protection - Restrained
and unrestrained differential protection of motors, generators
and transformers
(IEC 60255-187-1:2021)

Relais de mesure et dispositifs de protection - Partie 187-1: Messrelais und Schutzeinrichtungen - Teil 187-1:

Exigences fonctionnelles pour la protection différentielle - Funktionsanforderungen für den stabilisierten und nicht

Protection différentielle avec et sans caractéristique de stabilisierten Differentialschutz von Motoren, Generatoren

retenue des moteurs, générateurs et transformateurs und Transformatoren
(IEC 60255-187-1:2021) (IEC 60255-187-1:2021)

This European Standard was approved by CENELEC on 2021-09-01. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 60255-187-1:2021 E
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SIST EN 60255-187-1:2021
EN IEC 60255-187-1:2021 (E)
European foreword

The text of document 95/465/FDIS, future edition 1 of IEC 60255-187-1, prepared by IEC/TC 95

“Measuring relays and protection equipment” was submitted to the IEC-CENELEC parallel vote and

approved by CENELEC as EN IEC 60255-187-1:2021.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2022-06-01

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2024-09-01

document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Any feedback and questions on this document should be directed to the users’ national committee. A

complete listing of these bodies can be found on the CENELEC website.
Endorsement notice

The text of the International Standard IEC 60255-187-1:2021 was approved by CENELEC as a

European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 61850 (series) NOTE Harmonized as EN 61850 (series)
IEC 61850-7-4:2010 NOTE Harmonized as EN 61850-7-4:2010 (not modified)
IEC 61850-9-2 NOTE Harmonized as EN 61850-9-2
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SIST EN 60255-187-1:2021
EN IEC 60255-187-1:2021 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the

relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available

here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60255-1 - Measuring relays and protection equipment EN 60255-1 -
- Part 1: Common requirements
IEC 61850-8-1 - Communication networks and systems for EN 61850-8-1 -
power utility automation - Part 8–1:
Specific communication service mapping
(SCSM) - Mappings to MMS (ISO 9506-1
and ISO 9506-2) and to ISO/IEC 8802-3
IEC 61869-2 - Instrument transformers - Part 2: Additional EN 61869-2 -
requirements for current transformers
IEC 61869-9 - Instrument transformers - Part 9: Digital EN IEC 61869-9 -
interface for instrument transformers
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SIST EN 60255-187-1:2021
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SIST EN 60255-187-1:2021
IEC 60255-187-1
Edition 1.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Measuring relays and protection equipment –
Part 187-1: Functional requirements for differential protection – Restrained and
unrestrained differential protection of motors, generators and transformers
Relais de mesure et dispositifs de protection –
Partie 187-1: Exigences fonctionnelles pour la protection différentielle –
Protection différentielle avec et sans caractéristique de retenue des moteurs,
générateurs et transformateurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.70 ISBN 978-2-8322-1003-9

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 60255-187-1:2021
– 2 – IEC 60255-187-1:2021 © IEC 2021
CONTENTS

FOREWORD ......................................................................................................................... 11

1 Scope ............................................................................................................................ 13

2 Normative references .................................................................................................... 14

3 Terms and definitions .................................................................................................... 14

4 Specification of the function ........................................................................................... 18

4.1 General ................................................................................................................. 18

4.2 Input energizing quantities/energizing quantities ................................................... 19

4.2.1 General ......................................................................................................... 19

4.2.2 Connections .................................................................................................. 19

4.3 Binary input signals............................................................................................... 19

4.4 Functional logic ..................................................................................................... 22

4.4.1 General ......................................................................................................... 22

4.4.2 Phase biased differential protection ............................................................... 22

4.4.3 Biased restricted earth fault protection .......................................................... 24

4.4.4 Compensation of energizing quantities .......................................................... 25

4.4.5 Additional restraint or blocking methods ........................................................ 26

4.5 Binary output signals ............................................................................................ 27

4.5.1 General ......................................................................................................... 27

4.5.2 Start (pick-up) signals .................................................................................... 27

4.5.3 Operate (trip) signals ..................................................................................... 27

4.5.4 Other output signals ...................................................................................... 27

4.6 Additional influencing functions and conditions ..................................................... 27

4.6.1 General ......................................................................................................... 27

4.6.2 Operation during CT saturation ...................................................................... 28

4.6.3 Switch onto fault ............................................................................................ 28

4.6.4 Energizing quantity failure (CT supervision) ................................................... 28

4.6.5 Off-nominal frequency operation .................................................................... 28

4.6.6 Geomagnetically induced currents (GIC) ........................................................ 28

5 Performance specification ............................................................................................. 29

5.1 General ................................................................................................................. 29

5.2 Effective and operating ranges.............................................................................. 29

5.3 Steady state accuracy tests in the effective range ................................................. 29

5.3.1 General ......................................................................................................... 29

5.3.2 Test related to the declared thermal withstand current ................................... 30

5.3.3 Basic characteristic accuracy ......................................................................... 30

5.3.4 Ratio compensation accuracy ........................................................................ 30

5.3.5 Phase (vector) compensation validity ............................................................. 31

5.3.6 Zero sequence compensation validity ............................................................ 31

5.3.7 Harmonic restraint basic accuracy ................................................................. 31

5.3.8 Basic accuracy of time delay settings ............................................................ 31

5.3.9 Disengage time.............................................................................................. 31

5.4 Dynamic performance in operating range .............................................................. 32

5.4.1 General ......................................................................................................... 32

5.4.2 Typical operate time ...................................................................................... 32

5.4.3 Relay stability for external faults .................................................................... 32

5.4.4 Relay behaviour for internal fault preceded by an external fault ..................... 33

5.5 Stability during magnetizing inrush conditions ....................................................... 33

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SIST EN 60255-187-1:2021
IEC 60255-187-1:2021 © IEC 2021 – 3 –

5.6 Stability during overexcitation conditions .............................................................. 33

5.7 Presence of harmonics on load ............................................................................. 33

5.8 Performance during saturation of current transformers .......................................... 33

5.9 Behaviour of differential protection with digital interface for the energizing

quantities .............................................................................................................. 34

6 Functional tests ............................................................................................................. 34

6.1 General ................................................................................................................. 34

6.2 Test related to the declared thermal withstand current .......................................... 35

6.3 Steady state accuracy tests in effective range ...................................................... 35

6.3.1 General ......................................................................................................... 35

6.3.2 Basic characteristic accuracy ......................................................................... 37

6.3.3 Ratio (magnitude) compensation accuracy ..................................................... 44

6.3.4 Phase (vector) compensation validity ............................................................. 45

6.3.5 Zero sequence compensation validity ............................................................ 47

6.3.6 Harmonic restraint basic accuracy test under steady state conditions at

nominal frequency ......................................................................................... 50

6.3.7 Accuracy related to time delay setting ........................................................... 52

6.3.8 Determination and reporting of the disengage time ........................................ 54

6.4 Dynamic performance tests ................................................................................... 55

6.4.1 General ......................................................................................................... 55

6.4.2 Operate time for double infeed network model (restrained operation) ............ 57

6.4.3 Operate time for double infeed network model (unrestrained operation) ......... 68

6.4.4 Operate time for radial single infeed network model (restrained

operation) ...................................................................................................... 73

6.4.5 Operate time for radial single infeed network model (unrestrained

operation) ...................................................................................................... 86

6.4.6 Reporting of typical operate time ................................................................... 89

6.4.7 Stability for external faults ............................................................................. 95

6.5 Relay behaviour for internal fault preceded by an external fault .......................... 112

6.5.1 General ....................................................................................................... 112

6.5.2 Application specific considerations: transformer differential ......................... 112

6.5.3 Application specific considerations: biased restricted earth fault .................. 115

6.5.4 Application specific considerations: generator differential ............................ 119

6.5.5 Reporting ..................................................................................................... 122

6.6 Stability during inrush conditions......................................................................... 123

6.6.1 General ....................................................................................................... 123

6.6.2 Application specific considerations: transformer differential ......................... 123

6.7 Stability during overexcitation conditions ............................................................ 128

6.7.1 General ....................................................................................................... 128

6.7.2 Application specific considerations: transformer differential ......................... 128

6.8 Performance with load harmonics ....................................................................... 133

6.8.1 General ....................................................................................................... 133

6.8.2 Application specific considerations: transformer differential ......................... 133

6.8.3 Application specific considerations: generator or motor differential .............. 137

6.8.4 Application specific considerations: biased restricted earth fault .................. 140

6.8.5 Reporting ..................................................................................................... 142

7 Documentation requirements ....................................................................................... 143

7.1 Type test report .................................................................................................. 143

7.2 Other user documentation ................................................................................... 143

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SIST EN 60255-187-1:2021
– 4 – IEC 60255-187-1:2021 © IEC 2021
Annex A (informative) Examples of phase (vector) compensation and zero sequence

compensation schemes ....................................................................................................... 144

A.1 General ............................................................................................................... 144

A.2 Y→d conversion .................................................................................................. 145

A.2.1 Current conversion ...................................................................................... 145

A.2.2 Three-phase fault at Y (star/wye) side ......................................................... 146

A.2.3 Phase-phase fault at Y (star/wye) side ......................................................... 147

A.2.4 Single-phase fault at Y (star/wye) side ......................................................... 147

A.2.5 Three-phase fault at delta side .................................................................... 148

A.2.6 Phase-phase fault at delta side .................................................................... 149

A.2.7 Single-phase fault at delta side .................................................................... 149

A.2.8 Ratio between start currents under different fault types ............................... 152

A.3 d→Y conversion .................................................................................................. 152

A.3.1 Current conversion ...................................................................................... 152

A.3.2 Three-phase fault at Y (star/wye) side ......................................................... 153

A.3.3 Phase-phase fault at Y (star/wye) side ......................................................... 153

A.3.4 Single-phase fault at Y (star/wye) side ......................................................... 153

A.3.5 Three-phase fault at delta side .................................................................... 154

A.3.6 Phase-phase fault at delta side .................................................................... 154

A.3.7 Single-phase fault at delta side .................................................................... 155

A.3.8 Ratio between start currents under different fault types ............................... 155

Annex B (normative) Calculation of mean, median and mode ............................................. 156

B.1 Mean .................................................................................................................. 156

B.2 Median ................................................................................................................ 156

B.3 Mode .................................................................................................................. 156

B.4 Example ............................................................................................................. 156

Annex C (normative) CT requirements ............................................................................... 157

C.1 General ............................................................................................................... 157

C.2 Transformer differential protection ...................................................................... 161

C.2.1 General ....................................................................................................... 161

C.2.2 Fault 1 ......................................................................................................... 161

C.2.3 Fault 2 ......................................................................................................... 162

C.2.4 Fault 3 ......................................................................................................... 162

C.3 Transformer restricted earth fault protection ....................................................... 163

C.3.1 General ....................................................................................................... 163

C.3.2 Fault 1 ......................................................................................................... 163

C.3.3 Fault 2 ......................................................................................................... 164

C.3.4 Fault 3 ......................................................................................................... 164

C.4 Generator differential protection .......................................................................... 165

C.4.1 General ....................................................................................................... 165

C.4.2 Fault 2 ......................................................................................................... 165

C.4.3 Criteria and additional conditions ................................................................. 166

C.5 Motor differential protection ................................................................................ 166

C.5.1 General ....................................................................................................... 166

C.5.2 Fault 1 ......................................................................................................... 166

C.5.3 Criteria and additional conditions ................................................................. 166

C.5.4 Start of motor, security case ........................................................................ 167

C.5.5 Criteria and additional conditions ................................................................. 167

C.6 Reporting ............................................................................................................ 167

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SIST EN 60255-187-1:2021
IEC 60255-187-1:2021 © IEC 2021 – 5 –

Annex D (informative) CT saturation and influence on the performance of differential

relays ................................................................................................................................. 168

Annex E (informative) Guidance on dimensioning of CTs for transformer differential

protection ........................................................................................................................... 173

E.1 General ............................................................................................................... 173

E.2 Example 1 ........................................................................................................... 174

E.2.1 General ....................................................................................................... 174

E.2.2 Verification of CT1 – Internal fault ............................................................... 175

E.2.3 Verification of CT1 – External fault .............................................................. 175

E.2.4 Verification of CT2 ....................................................................................... 176

E.3 Example 2 ........................................................................................................... 177

E.3.1 General ....................................................................................................... 177

E.3.2 Dimensioning of CT1 ................................................................................... 178

E.3.3 Dimensioning of CT2 ................................................................................... 179

Annex F (informative) Examples of test procedures to determine CT sizing

requirements for differential protection ................................................................................ 181

F.1 General ............................................................................................................... 181

F.2 Test data ............................................................................................................ 183

F.2.1 General ....................................................................................................... 183

F.2.2 Network model for CT requirement tests for the transformer differential

protection .................................................................................................... 183

F.2.3 Network model for CT requirement tests for the transformer restricted

earth fault protection .................................................................................... 187

F.3 CT data and CT models ...................................................................................... 189

F.4 Test summary ..................................................................................................... 197

Annex G (normative) Ramping methods for testing basic characteristic accuracy ............... 199

G.1 General ............................................................................................................... 199

G.2 Pre-fault condition ............................................................................................... 199

G.3 Pseudo-continuous ramp .................................................................................... 199

G.4 Ramp of shots..................................................................................................... 201

Annex H (informative) Example of COMTRADE file for an evolving fault test case ............. 203

Annex I (normative) Definition of fault inception angle........................................................ 204

Bibliography ........................................................................................................................ 205

Figure 1 – Explanatory diagram for start time, operate time and disengage time ................... 17

Figure 2 – Simplified biased differential functional block diagram .......................................... 18

Figure 3 – Primary current reference direction ...................................................................... 21

Figure 4 – Typical restrained element (biased) characteristic ................................................ 23

Figure 5 – Typical unrestrained element characteristic .......................................................... 23

Figure 6 – Example of combined characteristic using restrained and unrestrained

elements ............................................................................................................................... 24

Figure 7 – Basic error of the operating characteristic ............................................................ 30

Figure 8 – Example of an operating characteristic in the I /I plane with a
DIFF REST

tolerance band ...................................................................................................................... 37

Figure 9 – Test cases for differential characteristic basic accuracy ....................................... 39

Figure 10 – Example of a differential characteristic with test lines "a" to "h" .......................... 40

Figure 11 – Machine differential protection ........................................................................... 40

Figure 12 – Test sequence for basic characteristic accuracy ................................................. 42

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