IEC_60093-1980_scan.pdf

NORME INTERNATIONALE INTERNATIONAL STANDARD CEI IEC Deuxieme Bdition Second edition 1980 Methodes pour la mesure de la resistivite transversale et de la resistivite superficielle des materiaux isolants electriques solides Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials CEI 1980 Droits de reproduction reserves-Copyright-all rights resewed Aucune partie de cette publication ne peut&re reproduite ni No part of this publicailon m y be reproduced or utilized in utilis6e sous quelque forrne que ce soit et par aucun pro-any form or by any means,eledranic or mechanical,cM6,Qlectronique ou&anique,y mmpris la photocopie et including photocopying and microfilm,without permission les microfilms,sans Iaocord ircrit dw Iirdilwur.in writing from the publisher,Bureau Central de la Commission Electrotechnique lnternationale 3,rue de Varembe Geneve.Suisse Commission Electrotechnique lnternationale CODE PRlX International Electrotechnical Commission PRICE CODE R Mecgynapomwn 3nelrrpoexrecan HOMHCCUR Pour prk,voir catalogue ern vigueur For price,see current catalogue INTERNATIONAL ELECTROTECHNICAL COMMISSION METHODS OF TEST FOR VOLUME RESISTIVITY AND SURFACE RESISTIVITY OF SOLID ELECTRICAL INSULATING MATERIALS FOREWORD I)The formal decisions or agreements of the IEC on technical matters,prepared by Technical Committees on which all the National Committees having a special interea therein are represented,express,as nearly as possible,an inremational consensus of opinion on the subjects dealt with.2)They have the form of recommendations for international use and they are accepted by the National Committees in that sense.3)In order to promote international unification,the IEC expresses the wish that all National Committees should adopt the text of the IEC recommendation for their national rules in so far as national conditions will permit.Any divergence between the IEC recommendation and the corresponding national rules should,as far as possible,be clearly indicated in the latter.PREFACE This standard has been prepared by Sub-Committee 15A:Short-time Tests,of IEC Technical Committee No.15:Insulating Materials.It forms the second edition of IEC Publication 93.A first draft was discussed at the meeting held in Toronto in 1975.As a result of this meeting,a draft,Document lSA(Centra1 Office135,was submitted to the National Committees for approval under the Six Months Rule in November 1977.Amendments,Document lSA(Centra1 Office)39,were submitted to the National Committees for approval under the Two Months Procedure in October 1979.The National Committees of the following countries voted explicitly in favour of publication:Austria BeIgium B razi 1 Bulgaria Canada China Czechoslovakia Denmark Egypt France Germany Ireland Italy Korea(Republic of)New Zealand Norway Poland Spain Sweden Switzerland United Kingdom United States of America Yugoslavia 01Iler ZECpublicarians quoted in this standard:Publications Nos.167:Methods of Test for the Dclermination of the Insulation Resistance of Solid Insulating Materials.212:Standard Conditions for Use Prior lo and during the Testing of Solid Electrical Insulating Materials.2M):Test Enclosures of Non-injection Type for Constant Relative Humidity.IEC 60093:1980iContentsPageCooperating organizationsInside front coverNational forewordii1Scope12Definitions13Significance14Power supply25Measuring methods and accuracy26Test specimens37Electrode material48Specimen handling and mounting59Conditioning510Test procedure511Calculation612Report7Appendix A Examples of measuring methods and their accuracy8Appendix B Formulae for calculating A and p9Figure 1 Basic connections for guarded electrodes used for:a)volume resistivity,b)surface resistivity10Figure 2 Example of electrode arrangement on flat specimen10Figure 3 Example of electrode arrangement on tubular specimen11Figure 4 Arrangement of liquid electrodes12Figure 5 Voltmeter-ammeter method used for measuringvolume resistance12Figure 6 Wheatstone bridge method used for measuringvolume resistance13Figure 7 Ammeter method used for measuring volume resistance13Publications referred toInside back coverIEC 60093:1980iiNational forewordThis British Standard is identical with IEC Publication 93(Second edition)“Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials”published in 1980 by the International Electrotechnical Commission(IEC).This British Standard is published under the direction of the General Electrotechnical Engineering Standards Committee.Terminology and conventions.The text of the International Standard has been approved as suitable for publication as a British Standard without deviation.Some terminology and certain conventions are not identical with those used in British Standards.The technical committee has reviewed the provisions of IEC 167 and IEC 260 to which reference is made in this standard,and has decided that they are acceptable for use in co