EN 61857-1:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Elektrische Isoliersysteme – Verfahren zur thermischen Bewertung – Teil 1: Allgemeine Anforderungen - Niederspannung (IEC 61857-1:2008)Systèmes d'isolation électriques - Procédures d'évaluation thermique - Partie 1: Exigences générales - Basse tension (CEI 61857-1:2008)Electrical insulation systems - Procedures for thermal evaluation - Part 1: General requirements - Low-voltage (IEC 61857-1:2008)29.080.30Izolacijski sistemiInsulation systemsICS:Ta slovenski standard je istoveten z:EN 61857-1:2009SIST EN 61857-1:2009en01-april-2009SIST EN 61857-1:2009SLOVENSKI
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EUROPEAN STANDARD EN 61857-1 NORME EUROPÉENNE
EUROPÄISCHE NORM January 2009
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 61857-1:2009 E
ICS 29.080.30 Supersedes EN 61857-1:2005
English version
Electrical insulation systems -
Procedures for thermal evaluation -
Part 1: General requirements -
Low-voltage (IEC 61857-1:2008)
Systèmes d'isolation électrique -
Procédures d'évaluation thermique -
Partie 1: Exigences générales -
Basse tension (CEI 61857-1:2008)
Elektrische Isoliersysteme -
Verfahren zur thermischen Bewertung -
Teil 1: Allgemeine Anforderungen -
Niederspannung (IEC 61857-1:2008)
This European Standard was approved by CENELEC on 2008-12-01. 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.
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) 2009-09-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow) 2011-12-01 Annex ZA has been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 61857-1:2008 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). __________ SIST EN 61857-1:2009

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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
IEC 60085 2004 Electrical insulation - Thermal classification EN 60085 1)
IEC 60216-4-1 - 2) Electrical insulating materials - Thermal endurance properties -
Part 4-1: Ageing ovens - Single-chamber ovens EN 60216-4-1 2006 3)
IEC 60216-5 - 2) Electrical insulating materials - Thermal endurance properties -
Part 5: Determination of relative thermal endurance index (RTE) of an insulating material EN 60216-5 2008 3)
IEC 60493-1 - 2) Guide for the statistical analysis of ageing
test data -
Part 1: Methods based on mean values of normally distributed test results - -
IEC 60505 2004 Evaluation and qualification of electrical insulation systems EN 60505 2004
1) EN 60085 is superseded by EN 60085:2008, which is based on IEC 60085:2007. 2) Undated reference.
3) Valid edition at date of issue.
IEC 61857-1Edition 3.0 2008-09INTERNATIONAL STANDARD NORME INTERNATIONALEElectrical insulation systems – Procedures for thermal evaluation –
Part 1: General requirements – Low-voltage
Systèmes d'isolation électrique – Procédures d'évaluation thermique –
Partie 1: Exigences générales – Basse tension
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE PICS 29.080.30 PRICE CODECODE PRIXISBN 2-8318-1003-4
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CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references.6 3 Terms and definitions.6 4 General information.8 4.1 Overview of test procedure.8 4.2 Basis of evaluation and qualification.8 4.3 Specific requirements.8 5 Test objects.9 5.1 General.9 5.2 Description.9 5.3 Number of test objects.9 6 Test procedures.9 6.1 General.9 6.2 Initial screening tests.9 6.3 Thermal ageing.10 6.4 Prediagnostic mechanical stress.11 6.5 Other prediagnostic conditioning.11 6.6 Moisture exposure.12 6.7 Dielectric diagnostic tests.12 6.8 Other diagnostic tests.12 7 Analyzing, reporting and classification.12 7.1 End-point criterion.12 7.2 Method of determining life.13 7.3 Extrapolation of data.13 7.4 Report of results.14 Bibliography.16
Figure 1 – Arrhenius graph for comparing a candidate system C
with a reference system R.15
Table 1 – Suggested ageing temperatures and ageing periods.10 Table 2 – Thermal class assignment.13
61857-1 © IEC:2008 – 3 –
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 112: Evaluation and qualification of electrical insulating materials and systems. This third edition cancels and replaces the second edition published in 2004, and constitutes
editorial revisions to make this standard compatible with Parts 21 and 22. The text of this standard is based on the following documents: CDV Report on voting 112/92/CDV 112/102/RVC
Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. SIST EN 61857-1:2009

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This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all the parts in the IEC 61857 series, under the general title Electrical insulation systems – Procedures for thermal evaluation, can be found on the IEC website.
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.
61857-1 © IEC:2008 – 5 –
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 electrotech
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