SIST EN 61857-1:2005
(Main)Electrical insulation systems - Procedures for thermal evaluation -- Part 1: General requirements - Low-voltage
Electrical insulation systems - Procedures for thermal evaluation -- Part 1: General requirements - Low-voltage
Specifies a general test procedure for the thermal evaluation and qualification of electrical insulation systems (EIS) and establishes a procedure that compares the performance of a candidate EIS to that of a reference EIS. This basic standard is applicable to existing or proposed EIS used in electrotechnical products with an input voltage of up to 1 000 V where the thermal factor is the dominating ageing factor. This second edition cancels and replaces the first edition published in 1998, and constitutes a technical revision to make this basic standard compatible with parts 21 and 22.
Elektrische Isoliersysteme - Verfahren zur thermischen Bewertung -- Teil 1: Allgemeine Anforderungen - Niederspannung
Systèmes d'isolation électrique - Procédures d'évaluation thermique -- Partie 1: Exigences générales - Basse tension
Spécifie une procédure d'essai générale pour une évaluation thermique et une qualification des systèmes d'isolation électriques (SIE), et établit une procédure comparant la qualité de fonctionnement d'un système d'isolation électrique candidat à celle d'un système d'isolation électrique de référence. Cette norme fondamentale s'applique aux systèmes d'isolation électriques existants ou proposés, utilisés dans les produits électrotechniques dont la tension d'entrée monte jusqu'à 1 000 V pour lesquels le facteur thermique est le facteur de vieillissement prépondérant. Cette deuxième édition annule et remplace la première édition, parue en 1998, et constitue une révision technique qui rend la présente norme fondamentale compatible avec les parties 21 et 22.
Sistemi električne izolacije – Postopki za toplotno vrednotenje – 1. del: Splošne zahteve – Nizka napetost
General Information
Relations
Standards Content (Sample)
SLOVENSKI SIST EN 61857-1:2005
STANDARD
julij 2005
Sistemi električne izolacije – Postopki za toplotno vrednotenje – 1. del:
Splošne zahteve – Nizka napetost
Electrical insulation systems – Procedures for thermal evaluation – Part 1: General
requirements – Low-voltage
ICS 29.080.30 Referenčna številka
SIST EN 61857-1:2005(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 61857-1
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2005
ICS 29.080.30 Supersedes EN 61857-1:1999
English version
Electrical insulation systems –
Procedures for thermal evaluation
Part 1: General requirements –
Low-voltage
(IEC 61857-1:2004)
Systèmes d'isolation électrique - Elektrische Isoliersysteme –
Procédures d'évaluation thermique Verfahren zur thermischen Bewertung –
Partie 1: Exigences générales – Teil 1: Allgemeine Anforderungen -
Basse tension Niederspannung
(CEI 61857-1:2004) (IEC 61857-1:2004)
This European Standard was approved by CENELEC on 2005-02-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, 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
© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61857-1:2005 E
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EN 61857-1:2005 - 2 -
Foreword
The text of document 98/222/FDIS, future edition 2 of IEC 61857-1, prepared by IEC TC 98, Electrical
insulation systems (EIS), was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61857-1 on 2005-02-01.
This European Standard supersedes EN 61857-1:1999.
It constitutes a technical revision which makes this basic standard compatible with parts 21 and 22.
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) 2005-11-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-02-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61857-1:2004 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 60034-18-1 NOTE Harmonized as EN 60034-18-1:1994 (not modified).
IEC 60034-18-21 NOTE Harmonized as EN 60034-18-21:1994 (not modified).
IEC 60034-18-31 NOTE Harmonized as EN 60034-18-31:1994 (not modified).
IEC 62114 NOTE Harmonized as EN 62114:2001 (not modified).
__________
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- 3 - EN 61857-1:2005
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 Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1) 2)
IEC 60216-4-1 - Guide for the determination of thermal HD 611.4.1 S1 1992
endurance properties of electrical
insulating materials
Part 4: Ageing ovens –
Section 1: Single-chamber ovens
1) 2)
IEC 60216-5 - Part 5: Determination of relative thermal EN 60216-5 2003
endurance index (RTE) of an insulating
material
1)
IEC 60493-1 - Guide for the statistical analysis of ageing - -
test data
Part 1: Methods based on mean values of
normally distributed test results
1) 2)
IEC 60505 - Evaluation and qualification of electrical EN 60505 2004
insulation systems
1)
Undated reference.
2)
Valid edition at date of issue.
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NORME CEI
INTERNATIONALE
IEC
61857-1
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2004-11
Systèmes d'isolation électrique –
Procédures d'évaluation thermique –
Partie 1:
Exigences générales – Basse tension
Electrical insulation systems –
Procedures for thermal evaluation –
Part 1:
General requirements – Low-voltage
IEC 2004 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.
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
Q
PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue
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61857-1 © IEC:2004 – 3 –
CONTENTS
FOREWORD.3
INTRODUCTION.9
1 Scope.11
2 Normative references.11
3 Terms and definitions .11
4 General information .15
4.1 Overview of test procedure .15
4.2 Basis of evaluation and qualification .15
4.3 Specific requirements .15
5 Test objects.17
5.1 General .17
5.2 Description .17
5.3 Number of test objects.17
6 Test procedures.19
6.1 General .19
6.2 Initial screening tests .19
6.3 Thermal ageing .19
6.4 Prediagnostic mechanical stress .23
6.5 Other prediagnostic conditioning .23
6.6 Moisture exposure .23
6.7 Dielectric diagnostic tests .23
6.8 Other diagnostic tests .25
7 Analyzing, reporting, and classification.25
7.1 End-point criterion .25
7.2 Method of determining life.25
7.3 Extrapolation of data.27
7.4 Report of results .27
Bibliography .33
Figure 1 – Arrhenius graph for comparing a candidate system C with a reference
system R.31
Table 1 – Suggested ageing temperatures and ageing periods.19
Table 2 – Thermal class assignment .27
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61857-1 © IEC:2004 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ELECTRICAL INSULATION SYSTEMS –
PROCEDURES FOR THERMAL EVALUATION –
Part 1: General requirements – Low-voltage
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, Publicly Available Specifications (PAS) 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 61857-1 has been prepared by IEC technical committee 98:
Electrical insulation systems (EIS).
This second edition cancels and replaces the first edition published in 1998, and constitutes a
technical revision to make this basic standard compatible with parts 21 and 22.
The text of this standard is based on the following documents:
FDIS Report on voting
98/222/FDIS 98/228/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.
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61857-1 © IEC:2004 – 7 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 61857 consists of the following parts, under the general title Electrical insulation systems –
Procedures for thermal evaluation
Part 1: General requirements – Low-voltage
Part 21: Specific requirements for general-purpose model – Wire-wound applications
Part 22: Specific requirements for encapsulated-coil model – Wire-wound electrical
insulation system (EIS)
Part 23: Specific requirements for general-purpose, tall-channel model – Wire-wound
electrical insulation system (EIS)
1
Part 31: Procedures for short time thermal evaluation
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
___________
1
This part is currently at the Committee Draft stage.
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61857-1 © IEC:2004 – 9 –
INTRODUCTION
This International Standard establishes a standardized test procedure for estimating by
comparison the life expectancy of electrical insulation systems (EIS) in accordance with
IEC 60505.
An EIS contains many different components selected to withstand the varying electrical,
mechanical, and thermal stresses occurring in the different parts of the structure of an
electrotechnical product. The useful life of an EIS depends upon the way that its individual
components are arranged, their interactions upon each other, and the contribution of each
component to the electrical and mechanical integrity of the EIS. Therefore, it is impossible to
specify one test object to represent all electrotechnical products. It is incumbent upon the IEC
equipment technical committees to address the test objects and application of this test
procedure that will meet their specific needs. This work is intended to proceed by horizontal
committee activity between this technical committee and other IEC technical committees to
develop a series of parts, each part to address a specific test object and/or application.
This procedure permits approximate comparisons only, and cannot be relied upon to com-
pletely determine the merits of any particular EIS. Such information can be obtained only from
extended service experience.
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61857-1 © IEC:2004 – 11 –
ELECTRICAL INSULATION SYSTEMS –
PROCEDURES FOR THERMAL EVALUATION –
Part 1: General requirements – Low voltage
1 Scope
This part of IEC 61857 specifies a general test procedure for the thermal evaluation and
qualification of electrical insulation systems (EIS) and establishes a procedure that compares
the performance of a candidate EIS to that of a reference EIS.
This basic standard is applicable to existing or proposed EIS used in electrotechnical products
with an input voltage of up to 1 000 V where the thermal factor is the dominating ageing factor.
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 60216-4-1, Guide for the determination of thermal endurance properties of electrical
insulating materials – Part 4: Ageing ovens – Section 1: Single chamber ovens
IEC 60216-5, Electrical insulating materials – Thermal endurance properties – Part 5:
Determination of relative thermal endurance index (RTE) of an insulating material
IEC 60493-1, Guide for the statistical analysis of ageing test data – Part 1: Methods based on
mean values of normally distributed test results
IEC 60505, Evaluation and qualification of electrical insulation systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60505 as well as the
following definitions apply.
3.1
electrical insulation system
EIS
insulating structure containing one or more electrical insulating materials (EIM) together with
associated conducting parts employed in an electrotechnical device
[IEC 60505, 3.1.1]
NOTE EIMs with different temperature indices (ATE/RTE according to IEC 60216-5) may be combined to form an
EIS which has a thermal class that may be higher or lower than that of any of the individual components according
to IEC 60505.
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61857-1 © IEC:2004 – 13 –
3.2
candidate EIS
EIS under evaluation to determine its service capability (thermal)
3.3
reference EIS
evaluated and established EIS with either a known service experience record or a known
comparative functional evaluation as a basis
3.4
thermal class
designation of an EIS that is equal to the numerical value of the maximum use temperature in
degrees Celsius (°C) for which the EIS is appropriate (see IEC 62114)
NOTE The EIS may be subjected to operating temperatures exceeding its thermal class which can result in
shorter expected life.
3.5
EIS assessed thermal endurance index
EIS ATE
numerical value of temperature in degrees Celsius for the reference EIS as derived from known
service experience or a known comparative functional evaluation
3.6
EIS relative thermal endurance index
EIS RTE
numerical value of the temperature in degrees Celsius for the candidate EIS which is relative to
the known EIS ATE of a reference EIS, when both EIS are subjected to the same ageing and
diagnostic procedures in a comparative test
3.7
test object
piece of the original equipment, representation (model) of equipment or component or part of
equipment, including the EIS, intended for use in a functional test
3.8
thermal ageing factor
thermal stress that causes irreversible changes of the properties of an EIS
3.9
conditioning
treatment which can be applied for a specified duration to establish base-line conditions
3.10
prediagnostic conditioning
variable or fixed stress, which can be applied continuously or periodically to an EIS to enhance
the ability to detect the degree of ageing
NOT
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