SIST EN 62068-1:2004
(Main)Electrical insulation systems - Electrical stresses produced by repetitive impulses -- Part 1: General method of evaluation of electrical endurance
Electrical insulation systems - Electrical stresses produced by repetitive impulses -- Part 1: General method of evaluation of electrical endurance
applies to electrical equipment, regardless of voltage, containing an insulation system, which is - connected to an electronic power supply, and - requires an evaluation of insulation endurance under repetitive voltage impulses. This standard proposes a general test procedure to facilitate screening of electrical insulation systems (EIS) and to achieve a relative evaluation of insulation endurance under conditions of repetitive impulses.
Elektrische Isoliersysteme (EIS) - Elektrische Belastungen durch sich wiederholende Impulse -- Teil 1: Allgemeines Prüfverfahren zur Beurteilung der elektrischen Belastbarkeit
Systèmes d'isolation électrique - Contraintes électriques produites par des impulsions de tension appliquées périodiquement -- Partie 1: Méthode générale d'évaluation de l'endurance électrique
S'applique au matériel électrique, indépendamment de la tension, comprenant un système d'isolation - connecté à une alimentation électronique, et - nécessitant une évaluation de l'endurance de l'isolation soumise à des impulsions de tension appliquées périodiquement. Cette norme propose une procédure générale d'essai afin de faciliter la sélection des systèmes d'isolation électriques (SIE) et de déterminer de façon relative l'endurance d'une isolation soumise à des impulsions de tension appliquées périodiquement.
Electrical insulation systems - Electrical stresses produced by repetitive impulses - Part 1: General method of evaluation of electrical endurance (IEC 62068-1:2003)
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SLOVENSKI SIST EN 62068-1:2004
STANDARD
februar 2004
Electrical insulation systems - Electrical stresses produced by repetitive impulses -
Part 1: General method of evaluation of electrical endurance (IEC 62068-1:2003)
ICS 29.080.30 Referenčna številka
SIST EN 62068-1:2004(en)
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
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EUROPEAN STANDARD EN 62068-1
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2003
ICS 29.080.30
English version
Electrical insulation systems –
Electrical stresses produced by repetitive impulses
Part 1: General method of evaluation of electrical endurance
(IEC 62068-1:2003)
Systèmes d'isolation électrique - Elektrische Isoliersysteme (EIS) -
Contraintes électriques produites Elektrische Belastungen durch sich
par des impulsions de tension appliquées wiederholende Impulse
périodiquement Teil 1: Allgemeines Prüfverfahren zur
Partie 1: Méthode générale d'évaluation Beurteilung der elektrischen Belastbarkeit
de l'endurance électrique (IEC 62068-1:2003)
(CEI 62068-1:2003)
This European Standard was approved by CENELEC on 2003-10-01. 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, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, 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
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62068-1:2003 E
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EN 62068-1:2003 - 2 -
Foreword
The text of document 98/188/FDIS, future edition 1 of IEC 62068-1, prepared by IEC TC 98, Electrical
insulation systems (EIS), was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 62068-1 on 2003-10-01.
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) 2004-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-10-01
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 annex A is informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62068-1:2003 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 60270 NOTE Harmonized as EN 60270:2001 (not modified).
IEC 60505 NOTE Harmonized as EN 60505:2000 (not modified).
__________
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- 3 - EN 62068-1:2003
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
1)
IEC 60727-1 - Evaluation of electrical endurance of - -
electrical insulation systems
Part 1: General considerations and
evaluation procedures based on normal
distributions
1)
IEC 61649 - Goodness-of-fit tests, confidence - -
intervals and lower confidence limits for
Weibull distributed data
1)
Undated reference.
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NORME CEI
INTERNATIONALE IEC
62068-1
INTERNATIONAL
Première édition
STANDARD
First edition
2003-07
Systèmes d'isolation électrique –
Contraintes électriques produites
par des impulsions de tension
appliquées périodiquement –
Partie 1:
Méthode générale d'évaluation
de l'endurance électrique
Electrical insulation systems –
Electrical stresses produced
by repetitive impulses –
Part 1:
General method of evaluation
of electrical endurance
IEC 2003 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 any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
N
Commission Electrotechnique Internationale PRICE CODE
International Electrotechnical Commission
Международная Электротехническая Комиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue
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62068-1 IEC:2003 – 3 –
CONTENTS
FOREWORD . 5
INTRODUCTION .9
1 Scope .11
2 Normative references.11
3 Terms and definitions .11
4 General test procedures .15
4.1 Overview .15
4.2 Test object.17
4.3 Screening test method.17
4.3.1 Test procedure.17
4.3.2 PDIV and PDEV measurements .17
4.3.3 Data processing.17
4.3.4 Evaluation.19
4.4 Endurance test method.19
4.4.1 Reference EIS .19
4.4.2 Comparison test.19
5 Test impulse-voltage characteristics .21
Annex A (informative) Impulse ageing .23
A.1 General.23
A.2 Effect of temperature .23
A.3 Effect of mechanical stress .25
A.4 Effect of humidity and the environment .25
A.5 Effect of voltage magnitude and impulse-voltage characteristics .25
A.6 Effect of impulse repetition rate.27
A.7 Effect of impulse polarity.27
A.8 Reference document .27
Bibliography.29
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62068-1 IEC:2003 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATION SYSTEMS –
ELECTRICAL STRESSES PRODUCED BY REPETITIVE IMPULSES –
Part 1: General method of evaluation of electrical endurance
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 International Standards, Technical Specifications,
Technical Reports, and Guides (hereafter referred to as “IEC Publication(s)”). 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. 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 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 IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62068-1 has been prepared by IEC technical committee 98:
Electrical insulation systems (EIS).
The text of this standard is based on the following documents:
FDIS Report on voting
98/188/FDIS 98/194/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 2.
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62068-1 IEC:2003 – 7 –
The committee has decided that the contents of this publication will remain unchanged until
2006. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
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62068-1 IEC:2003 – 9 –
INTRODUCTION
International Standard IEC 62068 consists of the following parts under the general title
Electrical insulation systems – Electrical stresses produced by repetitive impulses:
Part 1: General method of evaluation of electrical endurance
Part 2: State of the art
Other parts of IEC 62068 describing specific test procedures for particular insulation system
models are still under consideration. Alternatively, product technical committees may use IEC
62068-1 as a basis for their own specific test.
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62068-1 IEC:2003 – 11 –
ELECTRICAL INSULATION SYSTEMS –
ELECTRICAL STRESSES PRODUCED BY REPETITIVE IMPULSES –
Part 1: General method of evaluation of electrical endurance
1 Scope
This part of IEC 62068 is a basic publication that applies to electrical equipment, regardless
of voltage, containing an insulation system, which is
– connected to an electronic power supply, and
– requires an evaluation of insulation endurance under repetitive voltage impulses.
This standard proposes a general test procedure to facilitate screening of electrical insulation
systems (EIS) and to achieve a relative evaluation of insulation endurance under conditions of
repetitive impulses.
2 Normative references
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.
IEC 60727-1, Evaluation of electrical endurance of electrical insulation systems – Part 1:
General considerations and evaluation procedures based on normal distributions
IEC 61649, Goodness-of-fit tests, confidence intervals and lower confidence limits for Weibull
distributed data
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
electrical insulating material
EIM
electrically stressed component in an EIS
3.2
electrical insulation system
EIS
insulating structure containing one or more electrical insulating materials (EIM) together with
associated conducting parts employed in an electrotechnical device
1
[IEC 60505:1999, definition 3.1.1[2] ]
___________
1
Figures in square brackets refer to the bibliography.
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62068-1 IEC:2003 – 13 –
3.3
candidate EIS
EIS under evaluation to determine its electrical endurance when exposed to repetitive voltage
impulses
3.4
reference EIS
evaluated and established EIS with either a known service experience or a known
comparative functional evaluation under repetitive voltage impulses
3.5
partial discharge
PD
electric discharge that only partially bridges the insulation between conductors
[IEC 60270:2000, definition 3.1 modified [1]]
3.6
partial discharge inception voltage
PDIV
lowest voltage at which partial discharges are initiated in the test arrangement, when the
voltage applied to the object is gradually increased from a lower value at which no such
discharges are observed
3.7
partial discharge extinction voltage
PDEV
highest voltage at which partial discharges are extinguished in the test arrangement, when the
voltage applied to the object is gradually decreased from a higher value at which such
discharges are observed
3.8
unipolar impulse
voltage impulse, the polarity of which is either positive or negative
3.9
bipolar impulse
voltage impulse, the polarity of which alternates from positive to negative or vice versa
3.10
impulse-voltage polarity
polarity of the applied impulse, with respect to earth
3.11
impulse-voltage repetition rate
inverse of the time between two successive impulses when the time intervals are the same,
whether unipolar or bipolar
3.12
impulse rise time
1,25 times the time interval betw
...
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