EN 60243-2-2014 en Electric strength of insulating materials - Test methods - Part 2 Additional requirements for tests using direct voltage.pdf

1、BSI Standards PublicationElectric strength of insulatingmaterials Test methodsPart 2: Additional requirements for tests using direct voltageBS EN 60243-2:2014National forewordThis British Standard is the UK implementation of EN 60243-2:2014. It is identical to IEC 60243-2:2013. It supersedes BS EN 6

2、0243-2:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee GEL/112, Evaluation and qualification of electrical insulatingmaterials and systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publica

3、tion does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 83184 3ICS 29.035.01Compliance with a British Standard cannot confer immunity fr

4、omlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60243-2:2014EUROPEAN STANDARD EN 60243-2 NORME EUROPENNE EUROPISCHE NORM Fe

5、bruary 2014 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels 2014 CENELEC - All rights of exploitation in any form and by

6、 any means reserved worldwide for CENELEC members. Ref. No. EN 60243-2:2014 E ICS 17.220.99; 29.035.01 Supersedes EN 60243-2:2001 English version Electric strength of insulating materials - Test methods - Part 2: Additional requirements for tests using direct voltage (IEC 60243-2:2013) Rigidit dilec

7、trique des matriaux isolants - Mthodes dessai - Partie 2: Exigences complmentaires pour les essais tension continue (CEI 60243-2:2013) Elektrische Durchschlagfestigkeit von isolierenden Werkstoffen - Prfverfahren - Teil 2: Zustzliche Anforderungen fr Prfungen mit Gleichspannung (IEC 60243-2:2013) Th

8、is European Standard was approved by CENELEC on 2013-12-31. 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 re

9、ferences 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 o

10、f 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

11、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. BS EN 60243-2:2014EN 60243-2:2014 - 2 -

12、Foreword The text of document 112/245/CDV, future edition 3 of IEC 60243-2, prepared by IEC/TC 112 “Evaluation and qualification of electrical insulation materials and systems“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60243-2:2014. The following dates are fixed: l

13、atest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2014-09-30 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2016-12-31 This document supersedes EN 602

14、43-2:2001. This standard shall be read in conjunction with EN 60243-1. 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 not

15、ice The text of the International Standard IEC 60243-2:2013 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated : IEC 60674-2 NOTE Harmonized as EN 60674-2. BS EN 60243-2:201

16、4- 3 - EN 60243-2:2014 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, onl

17、y 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 I

18、EC 60243-1 2013 Electric strength of insulating materials - Test methods - Part 1: Tests at power frequencies EN 60243-1 2013 BS EN 60243-2:2014 2 60243-2 IEC:2013 CONTENTS 1 Scope 5 2 Normative references 5 3 Terms and definitions 5 4 Significance of the test 5 5 Electrodes and test specimens 6 6 C

19、onditioning before tests . 6 7 Surrounding medium . 6 8 Electrical apparatus . 6 8.1 Voltage source . 6 8.2 Voltage measurement 7 9 Procedure 7 10 Mode of increase of voltage . 7 11 Criterion of breakdown 7 12 Number of tests . 7 13 Report . 7 Bibliography 8 BS EN 60243-2:201460243-2 IEC:2013 5 ELEC

20、TRIC STRENGTH OF INSULATING MATERIALS TEST METHODS Part 2: Additional requirements for tests using direct voltage 1 Scope This part of IEC 60243 gives requirements additional to those in IEC 60243-1 for the determination of the electric strength of solid insulating materials under direct voltage str

21、ess. 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

22、amendments) applies. IEC 60243-1:2013, Electric strength of insulating materials Test methods Part 1: Tests at power frequencies 3 Terms and definitions For the purposes of this document, the terms and definitions in IEC 60243-1:2013 apply. 4 Significance of the test In addition to the requirements

23、of Clause 4 of IEC 60243-1:2013, the following points shall be considered when using direct-voltage tests. For a non-homogeneous test specimen, with alternating voltage, the distribution of voltage stress within the test specimen is determined by impedance (largely capacitive). With an increasing di

24、rect voltage, the voltage distribution may still be largely capacitive but depends partly on the rate of voltage increase. The resistive voltage distribution, after constant voltage application, represents the steady-state condition. The choice between direct or alternating voltage depends upon the

25、purpose for which the breakdown test is to be used and, to some extent, on the intended application of the material. Upon direct voltage application, the following currents result: the capacitive current, the electric absorption current, the leakage current and, in some cases, partial discharge curr

26、ents. In addition, for materials with dissimilar layers or discontinuities, the voltage distribution across the test specimen is also influenced, as a result of interfacial polarization, by charges of opposite polarity, which may accumulate on the two sides of the interface and create local fields s

27、ufficiently strong to produce partial discharges and/or breakdown of the test specimens. For most materials, the d.c. breakdown voltage is higher than the peak value of the power-frequency breakdown voltage; for many materials, particularly those which are non-homogeneous, the d.c. breakdown voltage

28、 will be three times higher than the a.c. breakdown voltage or even more. BS EN 60243-2:2014 6 60243-2 IEC:2013 5 Electrodes and test specimens For the purposes of this standard, the electrode configurations and shape of test specimen of Clause 5 of IEC 60243-1:2013 are applicable. 6 Conditioning be

29、fore tests Clause 6 of IEC 60243-1:2013 is applicable. 7 Surrounding medium Clause 7 of IEC 60243-1:2013 is applicable. 8 Electrical apparatus 8.1 Voltage source The test voltage applied to the electrodes shall be provided by a power supply having the following characteristics and components. A choi

30、ce of voltage of either positive or negative polarity shall be provided, one of the connections to the electrodes being earthed. The voltage ripple on the test voltage shall not exceed 2 % of the voltage at all values greater than 50 % of the breakdown voltage. The test voltage shall also be free fr

31、om transients or other fluctuations exceeding 1 % of the applied voltage. When testing test specimens of low capacitance, it may be necessary to add a suitable capacitor (for example, 1 000 pF) in parallel with the electrodes in order to reduce the influence of transients in initiating premature bre

32、akdowns. The controls on voltage shall be capable of varying the test voltage smoothly and uniformly between zero and the maximum test voltage and with the requested rate of voltage rise. The rate of voltage rise shall be controllable within 20 % of the specified rate. Steps in voltage rise shall no

33、t exceed 2 % of the expected breakdown voltage value. Controls which automatically increase the voltage at a selectable rate are preferable. A current-sensitive interrupting device shall be used for switching off the direct voltage source. For many materials, a dangerous voltage may persist across t

34、he test specimen for a considerable time after the d.c. test voltage is removed. Disconnection of the power supply to the direct voltage source does not necessarily result in the output voltage or the voltage at the electrodes being reduced to zero. For this reason, it is essential that the electrod

35、es be short-circuited and connected to earth for a period equal to minimum twice the total charging time to ensure that the charge is dissipated. For some large test specimens it will be necessary to maintain the shorted condition for 1 h or even longer. A current-limiting resistance shall be used i

36、n series with the test specimen to prevent damage to the high-voltage supply and to limit as far as possible the damage to the electrodes on the test specimen when breakdown takes place. The maximum current permitted will depend on the material under test and on the amount of damage to the electrode

37、s which can be tolerated. NOTE 1 The use of a very high-valued resistor may result in breakdown voltages which are higher than those obtained with a lower-valued resistor. BS EN 60243-2:201460243-2 IEC:2013 7 When making tests where the value or increase in the value of the current is used as a crit

38、erion for breakdown, means of measurement of current through the test specimen shall be provided. 8.2 Voltage measurement The measurement of applied voltage shall be made across the electrodes. The other requirements of Clause 8 of IEC 60243-1:2013 shall be met. 9 Procedure Clause 9 of IEC 60243-1:2

39、013 is applicable. 10 Mode of increase of voltage Unless otherwise specified, the voltage shall be applied in accordance with 10.1 (short-time test), 10.3 or 10.5 (slow and very slow rate-of-rise tests) or 10.6 (proof tests) of IEC 60243-1:2013. 11 Criterion of breakdown Clause 11 of IEC 60243-1:201

40、3 is applicable to direct voltage tests. Breakdown may be identified by a sudden increase in current or by the current exceeding a certain specified value. 12 Number of tests Clause 12 of IEC 60243-1:2013 is applicable. 13 Report Unless otherwise specified, the report shall include the following: a)

41、 a complete identification of the material tested, a description of the test specimens and the method of preparation; b) the polarity of the test voltage; c) the median (central value) of the electric strengths and/or breakdown voltages; d) the thickness of each test specimen (see 5.4 of IEC 60243-1

42、:2013); e) the surrounding medium during the test and its properties; f) the electrode system; g) the mode of application of the voltage; h) the individual values of electric strength and/or breakdown voltage; i) the temperature, pressure and humidity during tests in air or other gas; or the tempera

43、ture of the surrounding medium when this is a liquid; j) the conditioning treatment before test; k) an indication of the type and position of breakdown. BS EN 60243-2:2014 8 60243-2 IEC:2013 Bibliography IEC 60674-2, Specification for plastic films for electrical purposes Part 2: Methods of test IEC

44、/TR 60727-1:1982, Evaluation of electrical endurance of electrical insulation systems Part 1: General considerations and evaluation procedures based on normal distributions (withdrawn) IEC/TR 60727-2:1993, Evaluation of electrical endurance of electrical insulation systems Part 2: Evaluation procedu

45、res based on extreme-value distributions (withdrawn) IEC 62539:2007, Guide for the statistical analysis of electrical insulation breakdown data IEEE 930-1987 (R1995), IEEE guide for statistical analysis of electrical insulation voltage endurance data (Available from IEEE Operations Center, 445 Hoe L

46、ane, P.O. Box 1331, Piscataway, NJ 08855-1331, USA, or in some countries outside the USA, from local offices of the Global Info Center) Special Technical Publication 926, Engineering Dielectrics, Volume IIB: Electrical Properties of Solid Insulating Materials: Measurement Techniques Chapter 7: Stati

47、stical Methods for the Evaluation of Electrical Insulating Systems, American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, USA _ BS EN 60243-2:2014This page deliberately left blankBSI is the national body responsible for preparing British Standards and o

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