SIST EN 61857-1:2009
Electrical insulation systems - Procedures for thermal evaluation - Part 1: General requirements - Low-voltage (IEC 61857-1:2008)
Electrical insulation systems - Procedures for thermal evaluation - Part 1: General requirements - Low-voltage (IEC 61857-1:2008)
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 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.
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)
La CEI 61857-1:2008 spécifie une procédure d'essai générale pour une évaluation thermique et une qualification des systèmes d'isolation électrique (SIE), et établit une procédure comparant la qualité de fonctionnement d'un SIE candidat à celle d'un SIE de référence. Cette norme s'applique aux SIE 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 troisième édition annule et remplace la seconde édition publiée en 2004, et elle constitue une révision rédactionnelle pour rendre la présente norme compatible avec les Parties 21 et 22.
Sistemi električne izolacije - Postopki za toplotno vrednotenje - 1. del: Splošne zahteve - Nizka napetost (IEC 61857-1:2008)
General Information
Relations
Standards Content (Sample)
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
STANDARDSIST EN 61857-1:20051DGRPHãþD
SIST EN 61857-1:2009
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.
SIST EN 61857-1:2009
EN 61857-1:2009 - 2 - Foreword The text of document 112/92/CDV, future edition 3 of IEC 61857-1, prepared by IEC TC 112, Evaluation and qualification of electrical insulating materials and systems, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61857-1 on 2008-12-01. This European Standard supersedes EN 61857-1:2005 and constitutes editorial revisions to make EN 61857-1:2009
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)
2004
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.
SIST EN 61857-1:2009
SIST EN 61857-1:2009
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
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale SIST EN 61857-1:2009
– 2 – 61857-1 © IEC:2008
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
SIST EN 61857-1:2009
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
– 4 – 61857-1 © IEC:2008
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.
SIST EN 61857-1:2009
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 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 cooperation 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 completely determine the merits of any particular EIS. Such information can be obtained only from extended service experience. SIST EN 61857-1:2009
– 6 – 61857-1 © IEC:2008
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 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 60085:2004, Electrical insulation – Thermal evaluation and designation
IEC 60216-4-1, Electrical insulating materials – Thermal endurance properties – Part 4-1: Ageing ovens –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 60505:2004, 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, definition 3.1.1] NOTE EIM 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. 3.2
candidate EIS EIS under evaluation to determine its service capability (thermal) SIST EN 61857-1:2009
61857-1 © IEC:2008 – 7 –
3.3
reference EIS established EIS evaluated on the basis of either a known service experience record or a known comparative functional evaluation
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 60085) 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 sample of original equipment or part thereof, or model representing the equipment completely or partially, including the EIS, to be used in a functional test 3.8
thermal ageing factor thermal stress that causes irreversible changes of the properties of an EIS 3.9
prediagnostic conditioning variable or fixed stresses, which can be applied continuously or periodically to an EIS to enhance the ability of a functional test to detect the degree of ageing NOTE Prediagnostic conditioning may cause additional ageing. 3.10
diagnostic test periodic or continuous application of a specified level of a diagnostic factor to a test object to determine whether or when the end-point criterion has been reached 3.11
end-point criterion value of either a property or change of property defining the end of life of a test object in a functional test 3.12
end-of-life end of a test object’s life as determined by meet
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