EN 60255-121:2014
(Main)Measuring relays and protection equipment - Part 121: Functional requirements for distance protection
Measuring relays and protection equipment - Part 121: Functional requirements for distance protection
IEC 60255-121:2014 specifies minimum requirements for functional and performance evaluation of distance protection function typically used in, but not limited to, line applications for effectively earthed, three-phase power systems. This standard also defines how to document and publish performance tests. This standard covers distance protection function whose operating characteristic can be defined on an impedance plane and includes specification of the protection function, measurement characteristics, phase selection, directionality, starting and time delay characteristics. The test methodologies for verifying performance characteristics and accuracy are included in this standard. The standard defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions. It also includes the instrument transformer requirements for the protection function. The general requirements for measuring relays and protection equipment are defined in IEC 60255-1.
Messrelais und Schutzeinrichtungen - Teil 121: Funktionsanforderungen für den Distanzschutz
Relais de mesure et dispositifs de protection - Partie 121: Exigences fonctionnelles pour protection de distance
L'IEC 60255-121:2014 spécifie les exigences minimales relatives à l'évaluation fonctionnelle et à l'évaluation des performances de la fonction de protection de distance typiquement utilisée, sans s'y limiter à des applications de lignes dans des systèmes électriques triphasés avec mise à la terre directe. La présente norme définit également comment documenter et éditer des essais de qualification. La présente norme couvre la fonction de protection de distance dont la caractéristique de fonctionnement peut être définie sur un plan d'impédance et inclut la spécification de la fonction de protection, les caractéristiques de mesure, la sélection de phase, la directionnalité, les caractéristiques de démarrage et de temporisation. Les méthodologies d'essai pour vérifier les caractéristiques de performance et de précision sont incluses dans la présente norme. La norme définit les facteurs d'influence qui affectent la précision dans des conditions de régime établi et les caractéristiques de performance pendant des conditions dynamiques. Pour la fonction de protection, elle inclut aussi les exigences relatives aux transformateurs de mesure. Les exigences générales relatives aux relais de mesure et aux équipements de protection sont définies dans la norme CEI 60255-1.
Merilni releji in zaščitna oprema - 121. del: Funkcijske zahteve za daljinsko zaščito (IEC 60255-121:2014)
Standard EN IEC 60255-121 določa minimalne zahteve za ocenjevanje funkcij in delovanja daljinske zaščitne funkcije, ki se med drugim običajno uporablja za žice v učinkovito ozemljenih trifaznih napajalnih sistemih. Ta standard določa tudi, kako dokumentirati in objaviti preskuse delovanja. Ta standard zajema daljinsko zaščitno funkcijo, pri kateri so lahko lastnosti delovanja določene na impedančni ravnini, in vključuje določanje funkcije zaščite, značilnosti merjenja, izbiro faze, usmerjenost ter značilnosti vklopa in časovne zakasnitve. V tem standardu so zajete tudi preskusne metodologije za preverjanje lastnosti delovanja in točnosti. Standard določa dejavnike, ki vplivajo na točnost pri ustaljenih pogojih in lastnosti delovanja pri dinamičnih pogojih. Prav tako vključuje zahteve za instrumentne transformatorje za zaščitno funkcijo.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2014
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Measuring relays and protection equipment - Part 121: Functional requirements for
distance protection
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Relais de mesure et dispositifs de protection - Partie 121: Exigences fonctionnelles pour
protections de distance
Ta slovenski standard je istoveten z: EN 60255-121:2014
ICS:
29.120.70 Releji Relays
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 60255-121
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2014
ICS 29.120.70
English Version
Measuring relays and protection equipment - Part 121:
Functional requirements for distance protection
(IEC 60255-121:2014)
Relais de mesure et dispositifs de protection - Partie 121: Messrelais und Schutzeinrichtungen - Teil 121:
Exigences fonctionnelles pour protection de distance Funktionsanforderungen für den Distanzschutz
(CEI 60255-121:2014) (IEC 60255-121:2014)
This European Standard was approved by CENELEC on 2014-04-11. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60255-121:2014 E
Foreword
The text of document 95/319/FDIS, future edition 1 of IEC 60255-121, prepared by IEC/TC 95
"Measuring relays and protection equipment" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 60255-121:2014.
The following dates are fixed:
– latest date by which the document has to be implemented at (dop) 2015-01-11
national level by publication of an identical national
standard or by endorsement
– latest date by which the national standards conflicting with (dow) 2017-04-11
the 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 [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 60255-121:2014 was approved by CENELEC as a
European Standard without any modification.
- 3 - EN 60255-121:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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 60050 series International electrotechnical vocabulary - -
IEC 60255-1 - Measuring relays and protection equipment EN 60255-1 -
-- Part 1: Common requirements
IEC 61850 series Communication networks and systems for EN 61850 series
power utility automation
IEC 61869-2 2012 Instrument transformers -- Part 2: EN 61869-2 2012
Additional requirements for current
transformers
IEC 61869-5 2011 Instrument transformers -- Part 5: EN 61869-5 2011
Additional requirements for capacitor
voltage transformers
IEC 60255-121 ®
Edition 1.0 2014-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Measuring relays and protection equipment –
Part 121: Functional requirements for distance protection
Relais de mesure et dispositifs de protection –
Partie 121: Exigences fonctionnelles pour protection de distance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XG
ICS 29.120.70 ISBN 978-2-8322-1399-5
– 2 – IEC 60255-121:2014 © IEC 2014
CONTENTS
FOREWORD . 9
1 Scope . 11
2 Normative references . 11
3 Terms and definitions . 12
4 Specification of the function . 13
4.1 General . 13
4.2 Input energizing quantities/energizing quantities . 13
4.3 Binary input signals . 14
4.4 Functional logic . 15
4.4.1 Faulted phase identification . 15
4.4.2 Directional signals . 15
4.4.3 Distance protection function characteristics . 15
4.4.4 Distance protection zone timers . 16
4.5 Binary output signals . 16
4.5.1 General . 16
4.5.2 Start (pickup) signals . 16
4.5.3 Operate signals . 17
4.5.4 Other binary output signals . 17
4.6 Additional influencing functions/conditions . 17
4.6.1 General . 17
4.6.2 Inrush current . 17
4.6.3 Switch onto fault/trip on reclose . 17
4.6.4 Voltage transformer (VT) signal failure (loss of voltage) . 17
4.6.5 Power swings . 18
4.6.6 Behavior during frequencies outside of the operating range . 18
5 Performance specifications . 18
5.1 General . 18
5.2 Effective and operating ranges . 18
5.3 Basic characteristic accuracy under steady state conditions . 19
5.3.1 General . 19
5.3.2 Determination of accuracy related to time delay setting . 19
5.3.3 Disengaging time . 20
5.4 Dynamic performance . 20
5.4.1 General . 20
5.4.2 Transient overreach (TO) . 20
5.4.3 Operate time and transient overreach (SIR diagrams) . 21
5.4.4 Operate time and transient overreach (CVT-SIR diagrams). . 21
5.4.5 Typical operate time . 21
5.5 Performance with harmonics . 22
5.5.1 General . 22
5.5.2 Steady-state harmonics tests . 23
5.5.3 Transient LC oscillation tests . 23
5.6 Performance during frequency deviation . 23
5.6.1 General . 23
5.6.2 Steady state testing during frequency deviation . 23
5.6.3 Transient testing during frequency deviation . 23
5.7 Double infeed tests . 24
IEC 60255-121:2014 © IEC 2014 – 3 –
5.7.1 General . 24
5.7.2 Single line, double infeed system . 24
5.7.3 Double line, double infeed system . 24
5.8 Instrument transformer (CT, VT and CVT) requirements . 25
5.8.1 General . 25
5.8.2 CT requirements . 25
6 Functional tests . 29
6.1 General . 29
6.2 Rated frequency characteristic accuracy tests . 29
6.2.1 General . 29
6.2.2 Basic characteristic accuracy under steady state conditions . 30
6.2.3 Basic directional accuracy under steady state conditions . 43
6.2.4 Determination of accuracy related to time delay setting . 48
6.2.5 Determination and reporting of the disengaging time . 48
6.3 Dynamic performance . 50
6.3.1 General . 50
6.3.2 Dynamic performance: operate time and transient overreach
(SIR diagrams) . 51
6.3.3 Dynamic performance: operate time and transient overreach
(CVT-SIR diagrams) . 61
6.3.4 Dynamic performance: transient overreach tests. 65
6.3.5 Dynamic performance: typical operate time . 69
6.4 Performance with harmonics . 74
6.4.1 Steady state harmonics tests . 74
6.4.2 Transient oscillation tests (network simulation L-C) . 75
6.5 Performance during off-nominal frequency . 82
6.5.1 Steady state frequency deviation tests . 82
6.5.2 Transient frequency deviation tests . 85
6.6 Double infeed tests . 90
6.6.1 Double infeed tests for single line . 90
6.6.2 Double infeed tests for parallel lines (without mutual
inductance) . 96
6.6.3 Reporting of double infeed test results . 100
7 Documentation requirements . 101
7.1 Type test report .
...
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