EN 60255-5:2001

SLOVENSKI SIST EN 60255-5:2002
prva izdaja
STANDARD
julij 2002
Electrical relays - Part 5: Insulation coordination for measuring relays and protection
equipment - Requirements and tests
ICS 29.120.70 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 60255-5
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2001
ICS 29.120.70
English version
Electrical relays
Part 5: Insulation coordination for measuring relays
and protection equipment -
Requirements and tests
(IEC 60255-5:2000)
Relais électriques Elektrische Relais
Partie 5: Coordination de l'isolement Teil 5: Isolationskoordination für
des relais de mesure et des dispositifs Meßrelais und Schutzeinrichtungen -
de protection - Anforderungen und Prüfungen
Prescriptions et essais (IEC 60255-5:2000)
(CEI 60255-5:2000)
This European Standard was approved by CENELEC on 2001-03-01. 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60255-5:2001 E
Foreword
The text of document 95/98/FDIS, future edition 2 of IEC 60255-5, 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 60255-5 on 2001-03-01.
This standard should be read in conjunction with HD 625.1 S1:1996.
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) 2001-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-03-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative and annexes A to D are informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60255-5:2001 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60255-5:2001
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
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
IEC 60050-151 1978 International Electrotechnical --
Vocabulary (IEV)
Chapter 151: Electrical and magnetic
devices
IEC 60050-448 1995 Chapter 448: Power system protection - -
IEC 60060-1 1989 High-voltage test techniques HD 588.1 S1 1991
+ corr. March 1990 Part 1: General definitions and test
requirements
IEC 60085 1984 Thermal evaluation and classification of HD 566 S1 1990
electrical insulation
IEC 60112 1979 Method for determining the comparative HD 214 S2 1980
and the proof tracking indices of solid
insulating materials under moist
conditions
IEC 60255 Series Electrical relays EN 60255 Series
IEC 60255-21-1 1988 Part 21: Vibration, shock, bump and EN 60255-21-1 1995
seismic tests on measuring relays and
protection equipment -- Section 1:
Vibration tests (sinusoidal)
IEC 60255-21-2 1988 Part 21: Vibration, shock, bump and EN 60255-21-2 1995
seismic tests on measuring relays and
protection equipment -- Section 2:
Shock and bump tests
IEC 60255-21-3 1993 Part 21: Vibration, shock, bump and EN 60255-21-3 1995
seismic tests on measuring relays and
protection equipment -- Section 3:
Seismic tests
IEC 60664-1 1992 Insulation coordination for equipment HD 625.1 S1 1996
(mod) within low-voltage systems + corr. November 1996
Part 1: Principles, requirements and
tests
Publication Year Title EN/HD Year
IEC 61000-4-5 1995 Electromagnetic compatibility (EMC) EN 61000-4-5 1995
Part 4-5: Testing and measurement
techniques - Surge immunity test
IEC 61180-1 1992 High-voltage test techniques for low- EN 61180-1 1994
voltage equipment
Part 1: Definitions, test and procedure
requirements
IEC 61180-2 1994 Part 2: Test equipment EN 61180-2 1994

NORME CEI
INTERNATIONALE IEC
60255-5
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2000-12
Relais électriques –
Partie 5:
Coordination de l'isolement des relais de mesure
et des dispositifs de protection –
Prescriptions et essais
Electrical relays –
Part 5:
Insulation coordination for measuring relays
and protection equipment –
Requirements and tests
 IEC 2000 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun procédé, any form or by any means, electronic or mechanical,
électronique ou mécanique, y compris la photocopie et les including photocopying and microfilm, without permission in
microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
V
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

60255-5 © IEC:2000 – 3 –
CONTENTS
Page
FOREWORD . 5
INTRODUCTION .7
Clause
1 Scope and object . 9
2 Normative references. 9
3 Definitions. 11
4 Insulation coordination. 17
4.1 Basic principles. 17
4.2 Voltages and voltage ratings. 19
4.3 Time under voltage stress. 23
4.4 Pollution . 25
4.5 Information to be found on the relay or in the operating instructions. 25
4.6 lnsulation material. 25
5 Dimensioning requirements and rules . 27
5.1 Dimensioning of clearances . 27
5.2 Dimensioning of creepage distances. 27
5.3 Requirements for design of solid insulation. 29
6 Tests and measurements . 31
6.1 Tests . 31
6.2 Measurements . 43
Annex A (informative) Nominal voltages of supply systems . 45
Annex B (informative) Altitude correction factors . 47
Annex C (informative) Guidance for impulse voltage tests . 49
Annex D (informative) Measurement of creepage distances and clearances . 49
Table 1 – Rated insulation voltages. 19
Table 2 – Rated impulse voltages (waveform: 1,2/50 μs) . 23
Table 3 – Minimum clearances in air . 27
Table 4 – Minimum creepage distances. 29
Table 5 – Impulse test voltages . 35
Table 6 − AC test voltages . 39
Table 7 – Symbols for marking of test voltages . 41
Table A.1 – Nominal voltages of supply systems . 45
Table B.1 – Altitude correction factors. 47
Table C.1 – Components of the test generator . 49

60255-5 © IEC:2000 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL RELAYS –
Part 5: Insulation coordination for measuring relays and
protection equipment – Requirements and tests
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60255-5 has been prepared by IEC technical committee 95:
Measuring relays and protection equipment.
This second edition cancels and replaces the first edition, published in 1977, and constitutes
a technical revision.
This standard shall be read in conjunction with IEC 60664-1.
The text of this standard is based on the following documents:
FDIS Report on voting
95/98/FDIS 95/108/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
Annexes A to D are for information only.
The committee has decided that the contents of this publication will remain unchanged
until 2004. At this date, the publication will be
reconfirmed;
withdrawn;
replaced by a revised edition, or
amended.
60255-5 © IEC:2000 – 7 –
INTRODUCTION
The following points have been considered in the preparation of this standard.
– The application of the insulation coordination according to IEC 60664-1 leads to a graded
range of rated impulse voltages dependent on the nomi
...