EN 60255-151:2009

SLOVENSKI STANDARD
01-januar-2010
1DGRPHãþD
SIST EN 60255-3:2001
0HULOQLUHOHMLLQ]DãþLWQDRSUHPDGHO)XQNFLRQDOQLVWDQGDUG]DSRGLQ
QDGWRNRYQR]DãþLWR,(&
Measuring relays and protection equipment -- Part 151: Functional standard for
over/under current protection
Messrelais und Schutzeinrichtungen - Teil 151: Funktionsanforderungen für Über
-/Unterstromschutz
Relais de mesure et dispositifs de protection -- Partie 151: Norme fonctionnelle pour
protection à maximum/minimum de courant
Ta slovenski standard je istoveten z: EN 60255-151:2009
ICS:
29.120.70 Releji Relays
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60255-151
NORME EUROPÉENNE
October 2009
EUROPÄISCHE NORM
ICS 29.120.70 Supersedes EN 60255-3:1998 + corr. Jan.1998

English version
Measuring relays and protection equipment -
Part 151: Functional requirements
for over/under current protection
(IEC 60255-151:2009)
Relais de mesure  Messrelais und Schutzeinrichtungen -
et dispositifs de protection - Teil 151: Funktionsanforderungen
Partie 151: Exigences fonctionnelles für Über-/Unterstromschutz
pour les protections à maximum (IEC 60255-151:2009)
et minimum de courant
(CEI 60255-151:2009)
This European Standard was approved by CENELEC on 2009-09-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60255-151:2009 E
Foreword
The text of document 95/255/FDIS, future edition 1 of IEC 60255-151, prepared by IEC TC 95, Measuring
relays and protection equipment, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60255-151 on 2009-09-01.
This European Standard supersedes EN 60255-3:1998 + corrigendum January 1998.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-06-01
– latest date by which the national standards conflicting
(dow) 2012-09-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60255-151:2009 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 60044 NOTE  Harmonized in EN 60044 series (partially modified).
IEC 60255-8 NOTE  Harmonized as EN 60255-8:1998 (modified).
IEC 61850 NOTE  Harmonized in EN 61850 series (not modified).
IEC 61850-7-4 NOTE  Harmonized as EN 61850-7-4:2003 (not modified).
__________
- 3 - EN 60255-151:2009
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

1)
IEC 60050-447 200X International Electrotechnical Vocabulary - - -
Part 447: Measuring relays
2) 3)
IEC 60255-1 - Measuring relays and protection equipment - EN 60255-1 200X
Part 1: Common requirements
1)
To be published.
2)
Undated reference.
3)
To be ratified.
IEC 60255-151 ®
Edition 1.0 2009-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Measuring relays and protection equipment –
Part 151: Functional requirements for over/under current protection

Relais de mesure et dispositifs de protection –
Partie 151: Exigences fonctionnelles pour les protections à minimum et
maximum de courant
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 29.120.70 ISBN 2-8318-1060-0
– 2 – 60255-151 © IEC:2009
CONTENTS
FOREWORD.4
1 Scope and object.6
2 Normative references .6
3 Terms and definitions .6
4 Specification of the function.8
4.1 General .8
4.2 Input Energizing quantities / energizing quantities .8
4.3 Binary input signals .9
4.4 Functional logic .9
4.4.1 Operating characteristics .9
4.4.2 Reset characteristics .12
4.5 Binary output signals .16
4.5.1 Start (pick-up) signal .16
4.5.2 Operate (trip) signal.16
4.5.3 Other binary output signals.16
4.6 Additional influencing functions/conditions .16
4.7 Specific characteristics.16
5 Performance specification .17
5.1 Accuracy related to the characteristic quantity.17
5.2 Accuracy related to the operate time .18
5.3 Accuracy related to the reset time .18
5.4 Transient performance .19
5.4.1 Transient overreach.19
5.4.2 Overshoot time .19
5.4.3 Response to time varying value of the characteristic quantity .19
5.5 Current transformer requirements.19
6 Functional test methodology.20
6.1 General .20
6.2 Determination of steady state errors related to the characteristic quantity .20
6.2.1 Accuracy of setting (start) value .20
6.2.2 Reset ratio determination.22
6.3 Determination of steady state errors related to the start and operate time .23
6.4 Determination of steady state errors related to the reset time.23
6.5 Determination of transient performance .24
6.5.1 General .24
6.5.2 Transient overreach.24
6.5.3 Overshoot time .25
6.5.4 Response to time varying value of the characteristic quantity for
dependent time relays .26
7 Documentation requirements .27
7.1 Type test report.27
7.2 Other user documentation .27
Annex A (normative) Constants for dependent time operating and reset characteristics .29
Annex B (informative) Reset time determination for relays with trip output only.30
Bibliography.31

60255-151 © IEC:2009 – 3 –
Figure 1 – Simplified protection function block diagram.8
Figure 2 – Overcurrent independent time characteristic .10
Figure 3 – Undercurrent independent time characteristic .10
Figure 4 – Dependent time characteristic .11
Figure 5 – Definite time reset characteristic .13
Figure 6 – Definite time reset characteristic (alternative solution with instantaneous
reset after relay operation).14
Figure 7 – Dependent time reset characteristic .15
Figure 8 – Dependent time reset characteristic (alternative solution with instantaneous
reset after relay operation).16
Figure 9 – Voltage restrained characteristics .17
Figure 10 – Voltage controlled characteristics.17
Figure 11 – Typical test waveform for transient overreach .25
Figure 12 – Test waveform .26
Figure B.1 – Dependent reset time determination .30

Table 1 – Multiplier factor on operated time assigned error .18
Table 2 – Multiplier factor on reset time assigned error.19
Table 3 – Test points for overcurrent elements .23
Table 4 – Test points for undercurrent elements .23
Table 5 – Test points for overcurrent elements .24
Table 6 – Test points for undercurrent elements .24
Table 7 – Recommended values for the test .26
Table A.1 – Constants for dependent time operating and reset characteristics.29

– 4 – 60255-151 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MEASURING RELAYS AND PROTECTION EQUIPMENT –

Part 151: Functional requirements for over/under current protection

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes I
...