1、BSI Standards PublicationElectric strength of insulatingmaterials Test methodsPart 3: Additional requirements for 1,2/50 s impulse testsBS EN 60243-3:2014Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking per
2、mitted without license from IHS-,-,-National forewordThis British Standard is the UK implementation of EN 60243-3:2014. It is identical to IEC 60243-3:2013. It supersedes BS EN 60243-3:2002 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee GEL/112, Evalua
3、tion and qualification of electrical insulatingmaterials and systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct applicat
4、ion. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 83185 0ICS 17.220.99; 29.035.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy
5、 Committee on 31 March 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60243-3:2014Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted without license from
6、IHS-,-,-EUROPEAN STANDARD EN 60243-3 NORME EUROPENNE EUROPISCHE NORM February 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 - 100
7、0 Brussels 2014 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60243-3:2014 E ICS 17.220.99; 29.035.01 Supersedes EN 60243-3:2001 English version Electric strength of insulating materials - Test methods - Part 3: Additional requi
8、rements for 1,2/50 s impulse tests (IEC 60243-3:2013) Rigidit dilectrique des matriaux isolants - Mthodes dessai - Partie 3: Exigences complmentaires pour les essais aux ondes de choc 1,2/50 s (CEI 60243-3:2013) Elektrische Durchschlagfestigkeit von isolierenden Werkstoffen - Prfverfahren - Teil 3:
9、Zustzliche Festlegungen fr 1,2/50 s Stospannungsprfungen (IEC 60243-3:2013) This 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 nat
10、ional 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).
11、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, Bul
12、garia, 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, Switze
13、rland, Turkey and the United Kingdom. BS EN 60243-3:2014Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 60243-3:2014 - 2 - Foreword The text of document 112/246/CD
14、V, future edition 3 of IEC 60243-3, 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 60243-3:2014. The following dates are fixed: latest date by which the document has to
15、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 60243-3:2001. This standard shall be read i
16、n 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 notice The text of the International Standa
17、rd IEC 60243-3:2013 was approved by CENELEC as a European Standard without any modification. BS EN 60243-3:2014Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted without license from IHS-,-,- 3 - EN
18、 60243-3:2014 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, only the edi
19、tion 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 60243-
20、1 2013 Electric strength of insulating materials - Test methods - Part 1: Tests at power frequencies EN 60243-1 2013 BS EN 60243-3:2014Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted without lice
21、nse from IHS-,-,- 2 60243-3 IEC:2013 CONTENTS 1 Scope 5 2 Normative references . 5 3 Terms and definitions 5 4 Significance of the test . 6 5 Electrodes and test specimens . 7 6 Conditioning before tests . 7 7 Surrounding medium 7 8 Electrical apparatus . 7 8.1 Voltage source . 7 8.2 Voltage measure
22、ment 8 9 Procedure 8 10 Application of voltage . 8 10.1 Breakdown test 8 10.2 Proof tests . 8 11 Criterion of breakdown . 9 12 Number of tests . 9 13 Report . 9 Figure 1 Full impulse-voltage wave . 6 BS EN 60243-3:2014Copyright British Standards Institution Provided by IHS under license with BSI - U
23、ncontrolled Copy Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-60243-3 IEC:2013 5 ELECTRIC STRENGTH OF INSULATING MATERIALS TEST METHODS Part 3: Additional requirements for 1,2/50 s impulse tests 1 Scope This part of IEC 60243 gives requirements additional to tho
24、se in IEC 60243-1 for the determination of the electric strength of solid insulating materials under 1,2/50 s impulse voltage stress. 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
25、references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any 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 o
26、f this document, the terms and definitions given in IEC 60243-1, together with the following, apply. 3.1 full impulse-voltage wave aperiodic transient voltage that rises rapidly to a maximum value, then falls less rapidly to zero (see Figure 1) 3.2 peak value (of an impulse-voltage wave) UPmaximum v
27、alue of voltage 3.3 virtual peak value (of an impulse-voltage wave) U1value derived from a recording of an impulse-voltage wave on which high-frequency oscillations, or overshoot of a limited magnitude, may be present 3.4 virtual origin (of an impulse-voltage wave) O1point of intersection O1with the
28、 line of zero voltage of a line drawn through the points of 0,3 and 0,9 times the virtual peak value on the front of an impulse-voltage wave (see Figure 1) BS EN 60243-3:2014Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproducti
29、on or networking permitted without license from IHS-,-,- 6 60243-3 IEC:2013 3.5 virtual front time (of an impulse-voltage wave) t1equal to 1,67 times the interval tfbetween the instants when the voltage is 0,3 and 0,9 times the peak value (tf, Figure 1) 3.6 virtual time to half-value t2time interval
30、 t2between the virtual origin O1and the instant on the tail when the voltage has decreased to half the peak value 3.7 impulse breakdown voltage nominal peak voltage that the wave causing breakdown would have reached if breakdown had not occurred 3.8 withstand voltage highest nominal peak voltage of
31、a set of three impulses which did not cause breakdown tft1t2t1,00,90,50,30O1t1= 1,67 tfBAU/UpIEC 1085/01Figure 1 Full impulse-voltage wave 4 Significance of the test In addition to the information of Clause 4 of IEC 60243-1:2013, the following points are of importance in connection with impulse-volt
32、age tests. High-voltage equipment may be subjected to transient voltage stresses resulting from such causes as nearby lightning strokes. This is particularly true of apparatus such as transformers and switchgears used in electrical power transmission and distribution systems. The ability of insulati
33、ng materials to withstand these transient voltages is important in establishing the reliability of apparatus insulated with these materials. Transient voltages caused by lightning may be of either positive or negative polarity. In a symmetrical field between identical electrodes, the polarity has no
34、 effect on the electric BS EN 60243-3:2014Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-60243-3 IEC:2013 7 strength. However, with dissimilar electrodes, there may
35、be a pronounced polarity effect. When asymmetrical electrodes are used for testing materials with which the tester has no previous experience or knowledge, it is recommended that comparative tests be made with both directions of polarity. The standard wave shape is a 1,2/50 s wave, reaching peak vol
36、tage in approximately 1,2 s, and decaying to 50 % of peak value in approximately 50 s after the beginning of the wave. This wave is intended to simulate a lightning stroke that may strike a system without breakdown. NOTE If the object being tested has appreciable inductive characteristics, it may be
37、 difficult or impossible to attain the specified wave shape with less than 5 % oscillations, as prescribed in 8.2. However, the procedures given in this standard are expected ordinarily to be applied to configurations of test specimens and electrodes which are primarily capacitive. Testing of more c
38、omplex configurations, such as between coils of completed apparatus or models of such apparatus, should be performed in accordance with the specifications for that apparatus. Because of the short time involved, dielectric heating, other thermal effects and the influence of injected space-charges may
39、 be reduced during impulse testing of most materials. Thus, impulse tests usually give higher values than the peak voltage of short-term ac tests. From comparisons of the impulse electric strength with the values drawn from longer time tests, inferences may be drawn as to the modes of failure under
40、the various tests for a given material. 5 Electrodes and test specimens Clause 5 of IEC 60243-1:2013 is applicable. 6 Conditioning before 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 t
41、est voltage applied to the electrodes shall be provided by an impulse generator having the following characteristics. A choice of either positive or negative polarity shall be provided, one of the connections to the electrodes being earthed. Controls within the generator shall be capable of adjustin
42、g the shape of the wave applied to the test specimen under test to have a virtual front time t1of (1,2 0,36) s, and virtual time to half-value t2of (50 10) s (see Figure 1). The voltage capability and energy-storage capacity of the generator shall be sufficient to apply impulse waves of the proper s
43、hape to any test specimens to be tested, up to the breakdown voltage or specified proof voltage of the material. The peak value of the voltage is taken as the virtual peak value, provided that the conditions of 8.2 are satisfied. BS EN 60243-3:2014Copyright British Standards Institution Provided by
44、IHS under license with BSI - Uncontrolled Copy Not for ResaleNo reproduction or networking permitted without license from IHS-,-,- 8 60243-3 IEC:2013 8.2 Voltage measurement Provisions shall be made for recording the voltage wave as applied to the test specimen, and for measuring the virtual peak vo
45、ltage, the virtual front time and the virtual time to half-value within 5 % of the true values. If the voltage wave has oscillations with a magnitude of no more than 5 % of the peak value, and a frequency of at least 0,5 MHz, a mean curve may be drawn, the maximum amplitude of which is the virtual p
46、eak value. If the oscillations are of greater magnitude, or of lower frequency, the voltage wave is not acceptable for a standard test. 9 Procedure Clause 9 of IEC 60243-1:2013 is applicable. However, the application of the voltage shall be as shown in Clause 10. 10 Application of voltage 10.1 Break
47、down test Breakdown tests shall be in accordance with Clause 11 of IEC 60243-1:2013. The voltage impulses shall be applied in an increasing series of sets of three waves of equal peak voltages. The peak voltage of the initial set should be approximately 70 % of the expected breakdown voltage. Increa
48、se the peak voltage of successive sets by 5 % to 10 % of the peak value of the first set. Table 1 of IEC 60243-1:2013 is applicable. Allow sufficient time between successive impulses for the generator to become completely charged. Normally, a time of three times the charging time constant for the generator is sufficient. Sufficient time shall also be allowed between successive impulses to allow dissipation of any injected space-charge. For many materials, the charging time of the generator will cover this eventuality. For materials havin
