1、 IEC 60243-2 Edition 3.0 2013-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Electric strength of insulating materials Test methods Part 2: Additional requirements for tests using direct voltage Rigidit dilectrique des matriaux isolants Mthodes dessai Partie 2: Exigences complmentaires pour les essa
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16、3.0 2013-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Electric strength of insulating materials Test methods Part 2: Additional requirements for tests using direct voltage Rigidit dilectrique des matriaux isolants Mthodes dessai Partie 2: Exigences complmentaires pour les essais tension continue I
17、NTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE J ICS 17.220.99; 29.035.01 PRICE CODE CODE PRIX ISBN 978-2-8322-1200-4 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make
18、 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 60243-2 IEC:2013 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references 5 3 Terms and definitions 5 4 Significance of the test 5
19、 5 Electrodes and test specimens 6 6 Conditioning 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 8 602
20、43-2 IEC:2013 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRIC STRENGTH OF INSULATING MATERIALS TEST METHODS Part 2: Additional requirements for tests using direct voltage FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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30、e 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 responsib
31、le for identifying any or all such patent rights. International Standard IEC 60243-2 has been prepared by technical committee 112: Evaluation and qualification of electrical insulation materials and systems This third edition cancels and replaces the second edition published in 2001, and constitutes
32、 an editorial revision. This standard shall be read in conjunction with IEC 60243-1. The text of this standard is based on the following documents: CDV Report on voting 112/245/CDV 112/266A/RVC 4 60243-2 IEC:2013 Full information on the voting for the approval of this standard can be found in the re
33、port 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 Electric strength of insulating materials Test methods, can be found on the IEC website. Th
34、e 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 revise
35、d edition, or amended. 60243-2 IEC:2013 5 ELECTRIC 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
36、 insulating materials under direct 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 references, only the edition cited applies. For undated references, the latest edit
37、ion 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 of this document, the terms and definitions in IEC 60243-1:2013 apply. 4 Significanc
38、e of the test In addition to the requirements 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 impedan
39、ce (largely capacitive). With an increasing direct 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 d
40、irect or alternating voltage depends upon the 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 curr
41、ent and, in some cases, partial discharge currents. 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 si
42、des of the interface and create local fields sufficiently 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 a
43、re non-homogeneous, the d.c. breakdown voltage will be three times higher than the a.c. breakdown voltage or even more. 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 ap
44、plicable. 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 test voltage applied to the electrodes shall be provided by a power supply having the following characteris
45、tics and components. A choice 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 vo
46、ltage shall also be free from 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
47、in initiating premature breakdowns. 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. Ste
48、ps in voltage rise shall not 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 v
49、oltage may persist across the 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 electrodes be short-circuited and connected to earth for a period equal to minimum twice the total charging t
