Introduction to this PDF ，
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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 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 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 of this document, the terms and definitions in IEC 60243-1:2013 apply. 4 Significance 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 impedance (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 direct 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.
