1、 IEC 60243-3 Edition 3.0 2013-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Electric strength of insulating materials Test methods Part 3: Additional requirements for 1,2/50 s impulse tests Rigidit dilectrique des matriaux isolants Mthodes dessai Partie 3: Exigences complmentaires pour les essais a
2、ux ondes de choc 1,2/50 s IEC60243-3:2013 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photoc
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16、ition 3.0 2013-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Electric strength of insulating materials Test methods Part 3: Additional requirements for 1,2/50 s impulse tests Rigidit dilectrique des matriaux isolants Mthodes dessai Partie 3: Exigences complmentaires pour les essais aux ondes de cho
17、c 1,2/50 s INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE J ICS 17.220.99; 29.035.01 PRICE CODE CODE PRIX ISBN 978-2-8322-1201-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale W
18、arning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 60243-3 IEC:2013 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references . 5 3 Terms and definitions 5 4 Significance
19、 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 measurement 8 9 Procedure 8 10 Application of voltage . 8 10.1 Breakdown test 8 10.2 Proof tests . 8 11 Criterion of breakdown . 9
20、 12 Number of tests . 9 13 Report . 9 Figure 1 Full impulse-voltage wave . 6 60243-3 IEC:2013 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRIC STRENGTH OF INSULATING MATERIALS TEST METHODS Part 3: Additional requirements for 1,2/50 s impulse tests FOREWORD 1) The International Electrotechnical
21、 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
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30、ication 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 Publ
31、ication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60243-3 has been prepared by technical committee 112: Evaluation and qualification of electrical insulation materials and systems. This third editi
32、on cancels and replaces the second edition, published in 2001, and constitutes an editorial revision. This part of IEC 60243 shall be read in conjunction with IEC 60243-1. The text of this standard is based on the following documents: CDV Report on voting 112/246/CDV 112/267A/RVC 4 60243-3 IEC:2013
33、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. A list of all parts in the IEC 60243 series, published under the general title Elec
34、tric strength of insulating materials Test methods, can be found on the IEC website. 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 publicat
35、ion. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 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 additio
36、nal to those 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.
37、For dated 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
38、purposes of 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) U
39、Pmaximum value 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
40、O1with the 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) 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
41、the voltage is 0,3 and 0,9 times the peak value (tf, Figure 1) 3.6 virtual time to half-value t2time interval 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 brea
42、kdown would have reached if breakdown had not occurred 3.8 withstand voltage highest nominal peak voltage of 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 inform
43、ation of Clause 4 of IEC 60243-1:2013, the following points are of importance in connection with impulse-voltage 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 transfo
44、rmers and switchgears used in electrical power transmission and distribution systems. The ability of insulating 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 e
45、ither positive or negative polarity. In a symmetrical field between identical electrodes, the polarity has no effect on the electric 60243-3 IEC:2013 7 strength. However, with dissimilar electrodes, there may be a pronounced polarity effect. When asymmetrical electrodes are used for testing material
46、s 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 voltage in approximately 1,2 s, and decaying to 50 % of peak value in approximately 50 s after
47、 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 difficult or impossible to attain the specified wave shape with less than 5 % oscillations
48、, 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 complex configurations, such as between coils of completed apparatus or models of such appar
49、atus, 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 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 t
