SIST EN 61857-21:2005
(Main)Electrical insulation systems - Procedures for thermal evaluation -- Part 21: Specific requirements for general-purpose models - Wire-wound applications
Electrical insulation systems - Procedures for thermal evaluation -- Part 21: Specific requirements for general-purpose models - Wire-wound applications
Describes a general-purpose model (GPM) and a tall channel alternative model (GPM-TC) which can be used for the evaluation of wire-wound EIS where specific electrotechnical products are not available or required. This edition constitutes a technical revision by merging Part 23 into Part 21.
Elektrische Isoliersysteme - Verfahren zur thermischen Bewertung -- Teil 21: Spezielle Bedingungen für Mehrzweckmodelle - Anwendungen bei Drahtwicklungen
Systèmes d'isolation électriques - Procédures d'évaluation thermique -- Partie 21: Exigences particulières pour les modèles d'usage général - Applications aux enroulements à fil
Décrit un modèle d'usage général (GPM) et un modèle alternatif à chemin haut (GPM-TC) qui peuvent être utilisés pour évaluer les SIE à enroulements à fil quand les produits électrotechniques spécifiques ne sont pas disponibles ou pas requis. La présente édition constitue une révision technique en fusionnant les Parties 23 et 21.
Sistemi električne izolacije – Postopki za toplotno vrednotenje – 21. del: Posebne zahteve za modele za splošno/večnamensko uporabo – Uporaba pri žičnih navitjih
General Information
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Standards Content (Sample)
SLOVENSKI SIST EN 61857-21:2005
STANDARD
julij 2005
Sistemi električne izolacije – Postopki za toplotno vrednotenje – 21. del:
Posebne zahteve za modele za splošno/večnamensko uporabo – Uporaba pri
žičnih navitjih
Electrical insulation systems – Procedures for thermal evaluation – Part 21: Specific
requirements for general-purpose models – Wire-wound applications
ICS 29.080.30 Referenčna številka
SIST EN 61857-21:2005(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 61857-21
NORME EUROPÉENNE
EUROPÄISCHE NORM November 2004
ICS 29.080.30 Supersedes EN 61857-21:1999 & EN 61857-23:2002
English version
Electrical insulation systems –
Procedures for thermal evaluation
Part 21: Specific requirements for general-purpose models –
Wire-wound applications
(IEC 61857-21:2004)
Systèmes d'isolation électriques - Elektrische Isoliersysteme –
Procédures d'évaluation thermique Verfahren zur thermischen Bewertung
Partie 21: Exigences particulières Teil 21: Spezielle Bedingungen für
pour les modèles d'usage général - Mehrzweckmodelle –
Applications aux enroulements à fil Anwendungen bei Drahtwicklungen
(CEI 61857-21:2004) (IEC 61857-21:2004)
This European Standard was approved by CENELEC on 2004-10-01. 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, 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
© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61857-21:2004 E
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EN 61857-21:2004 - 2 -
Foreword
The text of document 98/214/FDIS, future edition 2 of IEC 61857-21, prepared by IEC TC 98,
Electrical insulation systems (EIS), was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 61857-21 on 2004-10-01.
This European Standard supersedes EN 61857-21:1999 and EN 61857-23:2002 and constitutes a
technical revision by merging Part 23 into Part 21.
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) 2005-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-10-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61857-21:2004 was approved by CENELEC as a European
Standard without any modification.
__________
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- 3 - EN 61857-21:2004
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
IEC 60455 Series Resin based reactive compounds used HD 307 Series
for electrical insulation EN 60455 Series
IEC 60464 Series Varnishes used for electrical insulation EN 60464 Series
1) 2)
IEC 60505 - Evaluation and qualification of electrical EN 60505 2000
insulation systems
1) 2)
IEC 61857-1 - Electrical insulation systems - Procedures EN 61857-1 1999
for thermal evaluation
Part 1: General requirements - Low-
voltage
1)
Undated reference.
2)
Valid edition at date of issue.
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NORME CEI
INTERNATIONALE IEC
61857-21
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2004-08
Systèmes d'isolation électriques –
Procédures d'évaluation thermique –
Partie 21:
Exigences particulières pour les modèles
d'usage général –
Applications aux enroulements à fil
Electrical insulation systems –
Procedures for thermal evaluation –
Part 21:
Specific requirements for general-
purpose models – Wire-wound applications
” IEC 2004 Droits de reproduction réservés Copyright - all rights reserved
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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
Commission Electrotechnique Internationale N
PRICE CODE
International Electrotechnical Commission
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Pour prix, voir catalogue en vigueur
For price, see current catalogue
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61857-21” IEC:2004 – 3 –
CONTENTS
FOREWORD .5
INTRODUCTION .9
1 Scope .11
2 Normative references .11
3 Terms and definitions .11
4 Construction.11
4.1 General information.11
4.2 Model components .13
4.3 Assembly of the model .15
5 Number of test objects.17
6 Test procedures .17
6.1 General .17
6.2 Initial screening tests.17
6.3 Thermal endurance test.19
7 End-of-life criterion.23
8 Analyzing, reporting and classification .23
Figure 1 – Schematic drawing of a GPM frame.25
Figure 2 – Manufacturing drawing of a GPM-TC frame.14
Figure 3 – Photos of GPM and GPM-TC test objects .29
Table 1 – Initial dielectric tests for GPM-TC .19
Table 2 – Dielectric diagnostic tests for GPM-TC .21
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61857-21” IEC:2004 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ELECTRICAL INSULATION SYSTEMS –
PROCEDURES FOR THERMAL EVALUATION –
Part 21: Specific requirements for general-purpose models –
Wire-wound applications
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 61857-21 has been prepared by IEC technical committee 98:
Electrical insulation systems (EIS).
This second edition cancels and replaces the first edition published in 1998. This edition
constitutes a technical revision by merging Part 23 into Part 21.
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61857-21” IEC:2004 – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
98/214/FDIS 98/223/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.
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 models – Wire-wound applications
Part 22: Specific requirements for encapsulated-coil 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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61857-21” IEC:2004 – 9 –
INTRODUCTION
A series of parts of IEC 61857 is being developed, each of which will address a specific test
object and/or application with an associated test procedure.
This part of IEC 61857 provides a procedure for the evaluation of wire-wound systems,
using general-purpose models, where the application is unknown.
As a function of the horizontal committee concept, additional parts will be developed in
cooperation with IEC technical committees responsible for equipment.
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61857-21” IEC:2004 – 11 –
ELECTRICAL INSULATION SYSTEMS –
PROCEDURES FOR THERMAL EVALUATION –
Part 21: Specific requirements for general-purpose models –
Wire-wound applications
1 Scope
This part of IEC 61857 describes a general-purpose model (GPM) and a tall channel
alternative model (GPM-TC) which can be used for the evaluation of wire-wound EIS where
specific electrotechnical products are not available or required.
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 60455 (all parts), Resin based reactive compounds used for electrical insulation
IEC 60464: (all parts), Varnishes used for electrical insulation
IEC 60505, Evaluation and qualification of electrical insulation systems
IEC 61857-1, Electrical insulation systems – Procedures for thermal evaluation – Part 1:
General requirements – Low-voltage
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60505 and IEC 61857-1
as well as the following definitions apply.
3.1
ground insulation
EIM used to separate conducting parts from ground
3.2
coil-to-coil insulation
EIM used to separate adjacent coils of winding wires
4 Construction
4.1 General information
General-purpose models are useful in evaluating the compatibility of the electrical insulation
materials (EIM) being used in a candidate EIS. A GPM is not capable of simulating the
influence of actual manufacturing processes such as winding techniques. Consequently, the
influence of the manufacturing processes will be minimal. A GPM may be assembled by hand
using simple facilities.
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61857-21” IEC:2004 – 13 –
The essential
...
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