SIST EN IEC 60370:2018
(Main)Test procedure for thermal endurance of insulating resins and varnishes for impregnation purposes - Electric breakdown methods (IEC 60370:2017)
Test procedure for thermal endurance of insulating resins and varnishes for impregnation purposes - Electric breakdown methods (IEC 60370:2017)
This International Standard covers methods of test for the determination of thermal endurance
(temperature index) of electrical insulating resins and varnishes for impregnation purposes.
It is done by means of impregnating glass cloth and measuring electric strength or breakdown
voltage before and after heat ageing.
It covers the materials described in IEC 60455-3-5 and IEC 60464-3-2 and similar materials.
Prüfverfahren zur Beurteilung des thermischen Langzeitverhaltens von Isolierharzen und -lacken für Imprägnierungen – Elektrische Durchschlagmethoden
Méthode d’essai pour l’évaluation de l’endurance thermique des résines et vernis isolants d’imprégnation - Méthodes de claquage électrique
IEC 60370:2017 traite des méthodes d’essai qui permettent de déterminer l’endurance thermique (indice de température) des résines et vernis isolants électriques d’imprégnation. Cette endurance est déterminée par imprégnation de tissu de verre et en mesurant la rigidité diélectrique ou la tension de claquage avant et après le vieillissement thermique. Elle couvre les matériaux décrits dans l’IEC 60455-3-5 et l’IEC 60464-3-2, ainsi que les matériaux analogues.Cette deuxième édition annule et remplace la première édition parue en 1971. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
- le présent document décrit deux méthodes, la méthode existante conforme aux exigences de l’ASTM D1932 et une nouvelle méthode conforme aux exigences de l’IEC 60455-2 et de l’IEC 60464-2;
- suppression et remplacement du contexte théorique et du mode de calcul par la référence à l’IEC 60216;
- actualisation de la présentation et du système de numérotation;
- ajout d’exemples pour une meilleure compréhension et représentation.
Mots clés: d’essai d’endurance thermique
Postopek za preskušanje toplotne vzdržljivosti izolacijskih smol in premazov, namenjenih za impregnacijo - Metode z električnim prebojem (IEC 60370:2017)
Ta mednarodni standard zajema metode preskusov za določanje toplotne vzdržljivosti (temperaturni indeks) električnih izolacijskih smol in lakov za impregnacijo.
To se izvede z impregnacijo steklene tkanine in merjenjem električne moči ali prebojne napetosti pred staranjem zaradi toplote in po njem.
Zajema material opisan v standardih IEC 60455-3-5, IEC 60464-3-2 in podobnih materialih.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 60370:2018
01-maj-2018
1DGRPHãþD
SIST HD 570 S1:1998
3RVWRSHN]DSUHVNXãDQMHWRSORWQHY]GUåOMLYRVWLL]RODFLMVNLKVPROLQSUHPD]RY
QDPHQMHQLK]DLPSUHJQDFLMR0HWRGH]HOHNWULþQLPSUHERMHP ,(&
Test procedure for thermal endurance of insulating resins and varnishes for impregnation
purposes - Electric breakdown methods (IEC 60370:2017)
Ta slovenski standard je istoveten z: EN IEC 60370:2018
ICS:
29.035.01 Izolacijski materiali na Insulating materials in
splošno general
SIST EN IEC 60370:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 60370:2018
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SIST EN IEC 60370:2018
EUROPEAN STANDARD EN IEC 60370
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2018
ICS 29.035.01 Supersedes HD 570 S1:1990
English Version
Test procedure for thermal endurance of insulating resins and
varnishes for impregnation purposes - Electric breakdown
methods
(IEC 60370:2017)
Méthode d'essai pour l'évaluation de l'endurance thermique Prüfverfahren zur Beurteilung des thermischen
des résines et vernis isolants d'imprégnation - Méthodes de Langzeitverhaltens von Isolierharzen und -lacken für
claquage électrique Imprägnierungen - Elektrische Durchschlagmethoden
(IEC 60370:2017) (IEC 60370:2017)
This European Standard was approved by CENELEC on 2018-01-17. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60370:2018 E
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SIST EN IEC 60370:2018
EN IEC 60370:2018 (E)
European foreword
The text of document 15/812/FDIS, future edition 2 of IEC 60370, prepared by IEC/TC 15 "Solid
electrical insulating materials" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60370:2018.
The following dates are fixed:
(dop) 2018-10-17
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-01-17
standards conflicting with the
document have to be withdrawn
This document supersedes HD 570 S1:1990.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 60370:2017 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 60455-2 NOTE Harmonized as EN 60455-2.
IEC 60464-2 NOTE Harmonized as EN 60464-2.
2
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SIST EN IEC 60370:2018
EN IEC 60370:2018 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60212 - Standard conditions for use prior to and EN 60212 -
during the testing of solid electrical
insulating materials
IEC 60216 series Electrical insulating materials - Thermal EN 60216 series
endurance properties
IEC 60216-4-1 - Electrical insulating materials - Thermal EN 60216-4-1 -
endurance properties -- Part 4-1: Ageing
ovens - Single-chamber ovens
IEC 60216-4-2 - Electrical insulating materials - Thermal EN 60216-4-2 -
endurance properties -- Part 4-2: Ageing
ovens - Precision ovens for use up to 300
°C
IEC 60216-4-3 - Electrical insulating materials - Thermal EN 60216-4-3 -
endurance properties -- Part 4-3: Ageing
ovens - Multi-chamber ovens
IEC 60243-1 - Electric strength of insulating materials - EN 60243-1 -
Test methods -- Part 1: Tests at power
frequencies
IEC 60455-3-5 - Resin based reactive compounds used for EN 60455-3-5 -
electrical insulation -- Part 3: Specifications
for individual materials -- Sheet 5:
Unsaturated polyester based impregnating
resins
IEC 60464-3-2 - Varnishes used for electrical insulation -- EN 60464-3-2 -
Part 3: Specifications for individual
materials -- Sheet 2: Hot curing
impregnating varnishes
IEC 60641-3-1 - Pressboard and presspaper for electrical EN 60641-3-1 -
purposes -- Part 3: Specifications for
individual materials -- Sheet 1:
Requirements for pressboard, types B.0.1,
B.0.3, B.2.1, B.2.3, B.3.1, B.3.3, B.4.1,
B.4.3, B.5.1, B.5.3 and B.6.1
ISO 2078 - Textile glass - Yarns - Designation EN ISO 2078 -
ISO 2113 - Reinforcement fibres - Woven fabrics - - -
Basis for a specification
3
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SIST EN IEC 60370:2018
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SIST EN IEC 60370:2018
IEC 60370
®
Edition 2.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Test procedure for thermal endurance of insulating resins and varnishes for
impregnation purposes – Electric breakdown methods
Méthode d’essai pour l’évaluation de l’endurance thermique des résines et
vernis isolants d’imprégnation – Méthodes de claquage électrique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.035.01 ISBN 978-2-8322-5108-9
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 60370:2018
– 2 – IEC 60370:2017 © IEC 2017
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Methods of test . 7
4.1 General . 7
4.2 Method 1 – Curved electrode system . 8
4.2.1 Specimen . 8
4.2.2 Impregnation process . 8
4.2.3 Curved electrode system . 9
4.2.4 Ageing ovens and ageing temperatures . 9
4.2.5 Test procedure . 10
4.3 Method 2 – Ball to plate method . 12
4.3.1 Specimen . 12
4.3.2 Impregnation process . 12
4.3.3 Electrode system . 13
4.3.4 Ageing ovens and ageing temperatures . 13
4.3.5 Test procedure . 14
5 Report . 16
Bibliography . 17
Figure 1 – Curved electrode fixture . 9
Figure 2 – Electric strength – Ageing time – Graph . 11
Figure 3 – Thermal endurance graph . 12
Figure 4 – Breakdown voltage – Ageing time – Graph . 15
Figure 5 – Thermal endurance graph . 15
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SIST EN IEC 60370:2018
IEC 60370:2017 © IEC 2017 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TEST PROCEDURE FOR THERMAL ENDURANCE OF INSULATING
RESINS AND VARNISHES FOR IMPREGNATION PURPOSES –
ELECTRIC BREAKDOWN METHODS
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 60370 has been prepared by IEC technical committee 15: Solid
electrical insulating materials.
This second edition cancels and replaces the first edition published in 1971. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) this document is now describing two methods, the existing one, following ASTM D1932
and new a method following the requirements of IEC 60455-2 and IEC 60464-2;
b) the theoretical background and way of calculation were removed, and replaced by
reference to IEC 60216;
c) the layout and numbering system was updated;
d) for better understanding and illustration purposes examples were added.
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SIST EN IEC 60370:2018
– 4 – IEC 60370:2017 © IEC 2017
The text of this International Standard is based on the following documents:
FDIS Report on voting
15/812/FDIS 15/819/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
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SIST EN IEC 60370:2018
IEC 60370:2017 © IEC 2017 – 5 –
INTRODUCTION
This document describes methods for thermal endurance testing. The methods described are
in line with IEC 60216 (all parts). More information about the theory of thermal endurance,
calculation methods and other possible methods can be found in IEC 60216 (all parts).
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SIST EN IEC 60370:2018
– 6 – IEC 60370:2017 © IEC 2017
TEST PROCEDURE FOR THERMAL ENDURANCE OF INSULATING
RESINS AND VARNISHES FOR IMPREGNATION PURPOSES –
ELECTRIC BREAKDOWN METHODS
1 Scope
This International Standard covers methods of test for the determination of thermal endurance
(temperature index) of electrical insulating resins and varnishes for impregnation purposes.
It is done by means of impregnating glass cloth and measuring electric strength or breakdown
voltage before and after heat ageing.
It covers the materials described in IEC 60455-3-5 and IEC 60464-3-2 and similar materials.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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 60212, Standard conditions for use prior to and during the testing of solid electrical
insulating materials
IEC 60216 (all parts), Electrical insulating materials – Thermal endurance properties
IEC 60216-4-1, Electrical insulating materials – Thermal endurance properties –
Part 4-1: Ageing ovens – Single-chamber ovens
IEC 60216-4-2, Electrical insulating materials – Thermal endurance properties – Part 4-2:
Ageing ovens – Precision ovens for use up to 300 °C
IEC 60216-4-3, Electrical insulating materials – Thermal endurance properties –
Part 4-3: Ageing ovens – Multi-chamber ovens
IEC 60243-1, Electric strength of insulating materials – Test methods – Part 1: Tests at power
frequencies
IEC 60455-3-5, Resin based reactive compounds used for electrical insulation – Part 3:
Specifications for individual materials – Sheet 5: Unsaturated polyester based impregnating
resins
IEC 60464-3-2, Varnishes used for electrical insulation – Part 3: Specifications for individual
materials – Sheet 2: Hot curing impregnating varnishes
IEC 60641-3-1, Pressboard and presspaper for electrical purposes – Part 3: Specifications for
individual materials – Sheet 1: Requirements for pressboard, types B.0.1, B.0.3, B.2.1, B.2.3,
B.3.1, B.3.3, B.4.1, B.4.3, B.5.1, B.5.3 and B.6.1
ISO 2078, Textile glass – Yarns – Designation
ISO 2113, Reinforcement fibers – Woven fabrics – Basis for a specification
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SIST EN IEC 60370:2018
IEC 60370:2017 © IEC 2017 – 7 –
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
resin
mixture of a reactive polymer with other reactive components such as hardener accelerator,
inhibitor or reactive diluent, and with or without filler and additives, whereby virtually no
volatile matter is released during the subsequent curing reaction
Note 1 to entry: Resins are solvent free.
Note 2 to entry: Small quantities of by-products can be evolved during the cure of selected resins. In the case
where a reactive diluent is used, small quantities of monomeric diluent can evaporate during cure manly due to the
application conditions used.
3.2
varnish
solution or emulsion of one or more resins in a solvent or carrier liquid
Note 1 to entry: Other components may be present, such as driers, catalysts, reactive diluents, dyestuffs,
pigments or co-solvents.
Note 2 to entry: The solvents and by-products are released during the drying/curing process and at the same time
the active components are polymerized and/or cross-linked forming a solid product.
4 Methods of test
4.1 General
In these test procedures, specimens are aged in ovens at elevated temperatures for specified
periods. The specimens are then removed from the oven, cooled and tested electrically. At
each temperature the thermal life is determined as the ageing time necessary for the electric
property to decrease
...
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