EN 62068:2013

Electrical insulating materials and systems - General method of evaluation of electrical endurance under repetitive voltage impulses

IEC 62068:2013 applies to electrical equipment, regardless of voltage, containing an insulation system, which is: - connected to an electronic power supply, and - requires an evaluation of insulation endurance under repetitive voltage impulses. This standard proposes a general test procedure to facilitate screening of electrical insulating materials (EIM) and systems (EIS) and to achieve a relative evaluation of insulation endurance under conditions of repetitive impulses. This first edition of IEC 62068 replaces IEC 62068-1:2003. It has been re-numbered as IEC 62068, as decided at the Plenary Meeting of TC 112 in Prague 2011. The main changes with regard to IEC 62068-1:2003 concern the terms and definitions which are now aligned, in part, on IEC/TS 61934 and IEC/TS 60034-18-42.

Elektrische Isolierstoffe und Isoliersysteme - Allgemeines Verfahren zur Bewertung der elektrischen Lebensdauer bei Beanspruchung mit sich wiederholenden Spannungsimpulsen

Matériaux et systèmes d'isolation électriques - Méthode générale d'évaluation de l'endurance électrique soumise à des impulsions de tension appliquées périodiquement

La CEI 62068:2013 s'applique au matériel électrique, indépendamment de la tension, comprenant un système d'isolation: - connecté à une alimentation électronique, et - nécessitant une évaluation de l'endurance de l'isolation soumise à des impulsions de tension appliquées périodiquement. Cette norme propose une procédure générale d'essai afin de faciliter la sélection des matériaux d'isolation électriques (MIE) et des systèmes d'isolation électriques (SIE), et de déterminer de façon relative l'endurance d'une isolation soumise à des impulsions de tension appliquées périodiquement. La première édition de la CEI 62068 remplace la CEI 62068-1:2003. L'intitulé du document a été modifié en CEI 62068, ce qui a été décidé lors de la réunion plénière du CE 112 à Prague, en 2011. Les principales modifications par rapport à la CEI 62068-1:2003 concernent les termes et les définitions, qui sont à présent alignés en partie sur la CEI/TS 61934 et la CEI/TS 60034-18-42.

Elektroizolacijski materiali in sistemi - Splošna metoda za ocenjevanje električne vzdržljivosti pri ponavljajočih se napetostnih impulzih

Ta mednarodni standard velja za električno opremo (ne glede na napetost), ki vsebuje izolacijski sistem, ki je – povezan z elektronskim napajanjem in – je zanj potrebna ocena izolacijske vzdržljivosti pri ponavljajočih se napetostnih impulzih. Ta standard predlaga splošen preskusni postopek za pomoč pri pregledu elektroizolacijskih materialov (EIM) in sistemov (EIS) ter za pridobitev splošne ocene izolacijske vzdržljivosti pri ponavljajočih se impulzih.

General Information

• Status: Published
• Publication Date: 26-Sep-2013
• Withdrawal Date: 14-Apr-2016
• ICS: 29.080.30 - Insulation systems
• Technical Committee: CLC/SR 112 - Evaluation and qualification of electrical insulating materials and systems (to be defined)
• Drafting Committee: IEC/TC 112 - IEC_TC_112
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 27-Sep-2013
• Completion Date: 27-Sep-2013
• Ref Project: SIST EN 62068:2014 - Electrical insulation materials and systems - General method of evaluation of electrical endurance under repetitive voltage impulses

Relations

• Replaces: EN 62068-1:2003 - Electrical insulation systems - Electrical stresses produced by repetitive impulses - Part 1: General method of evaluation of electrical endurance
• Effective Date: 28-Jan-2023

Overview

EN 62068:2013 (IEC 62068:2013) - published by CLC - defines a general method to evaluate electrical endurance of insulating materials and systems under repetitive voltage impulses. Applicable to electrical equipment of any voltage that is connected to an electronic power supply, this standard provides test procedures to screen electrical insulating materials (EIM) and electrical insulation systems (EIS) and to achieve a relative assessment of insulation endurance when exposed to repetitive impulse voltages. EN 62068:2013 supersedes EN 62068-1:2003 and aligns key terms and definitions with IEC/TS 61934 and IEC/TS 60034-18-42.

Key topics and requirements

• Scope and applicability: Targets EIM and EIS in equipment connected to electronic power supplies where repetitive impulse stress is relevant.
• Two main test methods:
  • Screening test method for rapid comparative evaluation.
  • Endurance test method for more detailed life assessment against a reference EIS.
• Partial discharge (PD) measurements: Defines and uses PD-related metrics including repetitive partial discharge inception voltage (RPDIV) and repetitive partial discharge extinction voltage (RPDEV) to characterize when PD activity starts and stops under impulse stress.
• Impulse‑voltage characteristics: Specifies general impulse forms, polarity (unipolar/bipolar), repetition rate, rise time, decay time and duty cycle considerations for testing.
• Data processing and statistical analysis: Refers to IEC 62539 for guidance on statistical treatment of insulation breakdown and life data.
• Terminology alignment: Updates and harmonizes definitions with IEC/TS 61934 and IEC/TS 60034-18-42 to ensure consistency across insulation evaluation standards.

Applications and who uses it

EN 62068 is intended for:

• Manufacturers of motors, transformers, power converters, capacitors and other equipment using electronic power supplies - to screen and qualify materials and insulation systems.
• Test laboratories and certification bodies performing endurance and PD testing.
• Design and reliability engineers assessing insulation life, selecting EIM/EIS, or validating designs against repetitive impulse stress.
• Quality assurance and compliance teams establishing screening criteria and comparative performance baselines.

Practical uses include material selection, comparative screening of insulation systems, verifying resistance to impulse ageing, and providing relative life estimates under repetitive impulse stress.

Related standards

• IEC/TS 61934 - partial discharge measurement terminology and methods (alignment of definitions)
• IEC/TS 60034-18-42 - insulation system considerations for rotating machines (terminology alignment)
• IEC 62539 - statistical analysis of insulation breakdown data
• IEC 60270 / IEC 60505 - referenced for PD measurement and insulation testing practices

Keywords: EN 62068:2013, IEC 62068, electrical insulating materials, electrical insulation systems, repetitive voltage impulses, partial discharge, RPDIV, RPDEV, impulse endurance testing, screening test, endurance test.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Matériaux et systèmes d'isolation électriques - Méthode générale d'évaluation de l'endurance électrique soumise à des impulsions de tension appliquées périodiquementElectrical insulation materials and systems - General method of evaluation of electrical endurance under repetitive voltage impulses29.080.30Izolacijski sistemiInsulation systemsICS:Ta slovenski standard je istoveten z:EN 62068:2013SIST EN 62068:2014en01-maj-2014SIST EN 62068:2014SLOVENSKI
STANDARDSIST EN 62068-1:20041DGRPHãþD

EUROPEAN STANDARD EN 62068 NORME EUROPÉENNE
EUROPÄISCHE NORM September 2013
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2013 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62068:2013 E
ICS 29.080.30 Supersedes EN 62068-1:2003
English version
Electrical insulating materials and systems -
General method of evaluation of electrical endurance under repetitive voltage impulses (IEC 62068:2013)
Matériaux et systèmes d'isolation électriques -
Méthode générale d'évaluation de l'endurance électrique soumise à des impulsions de tension appliquées périodiquement (CEI 62068:2013)
Elektrische Isolierstoffe und Isoliersysteme -
Allgemeines Verfahren zur Bewertung der elektrischen Lebensdauer bei Beanspruchung mit sich wiederholenden Spannungsimpulsen (IEC 62068:2013)
This European Standard was approved by CENELEC on 2013-04-15. 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Foreword The text of document 112/234/FDIS, future edition 1 of IEC 62068, prepared by IEC TC 112 "Evaluation and qualification of electrical insulating materials and systems" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62068:2013. The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2014-03-27 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2016-04-15
This document supersedes EN 62068-1:2003. EN 62068:2013 includes the following significant technical changes with respect to EN 62068-1:2003: The main changes with regard to EN 62068-1:2003 concern the terms and definitions which are now aligned, in part, on IEC/TS 61934 and CLC/TS 60034-18-42. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 62068:2013 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/TS 60034-18-42:2008 NOTE
Harmonised as CLC/TS 60034-18-42:2011 (not modified). IEC 60505:2011 NOTE
Harmonised as EN 60505:2011 (not modified). IEC 60270:2000 NOTE
Harmonised as EN 60270:2001 (not modified).
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Annex ZA
(normative)
Normative references to international publications with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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 62539 - Guide for the statistical analysis of electrical insulation breakdown data - -
IEC 62068 Edition 1.0 2013-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical insulating materials and systems – General method of evaluation of electrical endurance under repetitive voltage impulses
Matériaux et systèmes d'isolation électriques – Méthode générale d’évaluation de l'endurance électrique soumise à des impulsions de tension appliquées périodiquement
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE N ICS 29.080.30 PRICE CODE CODE PRIX ISBN 978-2-83220-676-8
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CONTENTS FOREWORD . 3 1 Scope . 5 2 Normative references . 5 3 Terms and definitions . 5 4 General test procedures . 8 4.1 Overview . 8 4.2 Test object . 9 4.3 Screening test method . 9 4.3.1 General . 9 4.3.2 Test procedure . 9 4.3.3 RPDIV and RPDEV measurements . 9 4.3.4 Data processing . 9 4.3.5 Evaluation . 10 4.4 Endurance test method. 10 4.4.1 Reference EIS . 10 4.4.2 Comparison test . 10 5 Test impulse-voltage characteristics . 11 Annex A (informative)
Impulse ageing . 12 Bibliography . 15
Table 1 – Test impulse-voltage characteristics . 11
62068 © IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
ELECTRICAL INSULATING MATERIALS AND SYSTEMS –
GENERAL METHOD OF EVALUATION OF ELECTRICAL ENDURANCE
UNDER REPETITIVE VOLTAGE IMPULSES
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 62068 has been prepared by IEC technical committee 112: Evaluation and qualification of electrical insulating materials and systems.
This first edition of IEC 62068 replaces IEC 62068-1:2003. It has been re-numbered as IEC 62068, as decided at the Plenary Meeting of TC 112 in Prague 2011.
The main changes with regard to IEC 62068-1:2003 concern the terms and definitions which are now aligned, in part, on IEC/TS 61934 [1]1 and IEC/TS 60034-18-42 [2]. ___________ 1 Figures in square brackets refer to the bibliography. SIST EN 62068:2014

– 4 – 62068 © IEC:2013
The text of this standard is based on the following documents: FDIS Report on voting 112/234/FDIS 112/242/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. The committee has decided that the contents of this publication will remain unchanged until the stability 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.
62068 © IEC:2013 – 5 –
ELECTRICAL INSULATING MATERIALS AND SYSTEMS –
GENERAL METHOD OF EVALUATION OF ELECTRICAL ENDURANCE
UNDER REPETITIVE VOLTAGE IMPULSES
1 Scope This International Standard applies to electrical equipment, regardless of voltage, containing an insulation system, which is – connected to an electronic power supply, and – requires an evaluation of insulation endurance under repetitive voltage impulses. This standard proposes a general test procedure to facilitate screening of electrical insulating materials (EIM) and systems (EIS) and to achieve a relative evaluation of insulation endurance under conditions of repetitive impulses. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 62539, Guide for the statistical analysis of electrical insulation breakdown data 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1
electrical insulating material EIM material with negligibly low electric conductivity, used to separate conducting parts at different electrical potentials [SOURCE: IEC 60505:2011, definition 3.1.2 [3] 2 3.2
electrical insulation system
EIS insulating structure containing one or more electrical insulating materials (EIM) together with associated conducting parts employed in an electrotechnical device [SOURCE: IEC 60505:2011, definition 3.1.1 [2] 3.3
candidate EIS EIS under evaluation to determine its electrical endurance when exposed to repetitive voltage impulses ___________ 2
Figures in square brackets refer to the Bibliography. SIST EN 62068:2014

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3.4
reference EIS evaluated and established EIS with either a known service experience or a known comparative functional evaluation under repetitive voltage impulses 3.5
partial discharge
PD electric discharge that only partially bridges the insulation between electrical conductors [SOURCE: IEC 60270:2000, definition 3.1 modified [4] – the word "localized" (electrical discharge) omitted from source definition, and definition shortened to omit reference to "which can or can not occur adjacent to a conductor". Also the three NOTES after the term have been omitted] 3.6
partial discharge pulse current pulse in an object under test that results from a partial discharge occurring within the object under test Note 1 to entry: The pulse is measured using suitable detector circuits, which have been introduced into the test circuit for the purpose of the test. Note 2 to entry: A detector in accordance with the provisions of this standard produces a current or a voltage signal at its output related to the PD pulse at its input. [SOURCE: IEC/TS 61934:2011, definition 3.3,
modified – In Note 2 to entry, "provisions" of this technical specification" edited to read "of this standard"]
3.7
repetitive partial discharge inception voltage RPDIV
minimum peak-to-peak impulse voltage at which more than five PD pulses occur on ten voltage impulses of the same polarity Note 1 to entry: This is a mean value for the specified test time and a test arrangement where the voltage applied to the test object is gradually increased from a value at which no partial discharge can be detected.
[SOURCE: IEC/TS 61934:2011, definition 3.4] 3.8
repetitive partial discharge extinction voltage RPDEV
maximum peak-to-peak impulse voltage at which less than five PD pulses occur on ten voltage impulses of the same polarity
Note 1 to entry: This is a mean value for the specified test time and a test arrangement where the voltage applied to the test object is gradually decreased from a value at which PD have been detected. [SOURCE: IEC/TS 61934:2011, definition 3.5] 3.9
partial discharge inception voltage
PDIV lowest voltage at which partial discharges are initiated in the test arrangement, when the voltage applied to the object is gradually increased from a lower value at which no such discharges are observed SIST EN 62068:2014

62068 © IEC:2013 – 7 –
3.10
partial discharge extinction voltage
PDEV highest voltage at which partial discharges are extinguished in the test arrangement, when the voltage applied to the object is gradually decreased from a higher value at which such discharges are observed 3.11
unipolar impulse voltage impulse, the polarity of which is either positive or negative 3.12
bipolar impulse voltage impulse, the polarity of which alternates from positive to negative or vice versa 3.13
impulse-voltage polarity polarity of the applied impulse, with respect to earth 3.14
impulse-voltage repetition rate inverse of the time between two successive impulses when the time intervals are the same, whether unipolar or bipolar 3.15
impulse rise time 1,25 times the time interval between 10 % and 90 % of the zero-to-peak impulse voltage, on the leading edge of the impulse 3.16
impulse decay time time interval between the instants at which the instantaneous value of an impulse decreases from a specified upper value to a specified lower value Note 1 to entry: Unless otherwise specified, the upper and lower values are fixed at 90 % and 10 % of the impulse magnitude.
[SOURCE: IEC/TS 61934:2
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