Причина отменыThis test method covers the determination of dielectricbreakdown voltage and dielectric strength of solid electricalinsulating materials under direct-voltage stress.Formerly under thejurisdiction of Committee D09 on Electrical and ElectronicInsulating Materials, this practice was withdrawn in January 2013in accordance with section 10.5.3.1 of the Regulations GoverningASTM Technical Committees, which requires that standards shall beupdated by the end of the eighth year since the last approvaldate.Значение и использование

This test method is intended for use as a control and acceptance test for direct-voltage applications. It may be used also in the partial evaluation of material for specific end uses and as a means for detecting changes in material due to specific deteriorating causes.

Experience indicates that the breakdown value obtained with direct voltage usually will be approximately 2 to 4 times the rms value of the 60-Hz alternating-voltage breakdown.

For a nonhomogeneous test specimen, the distribution of voltage stress within the specimen is determined by impedance (largely capacitive) with alternating voltage. With an increasing direct voltage, the voltage distribution may be still largely capacitive, but depends partly on the rate of voltage increase. After steady application of direct voltage the voltage division across the test specimen is determined by resistance. The choice of 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.

A more complete discussion of the significance of dielectric breakdown tests is given in Appendix X1 of this method and of Test Method D 149. Those appendix sections of Test Method D 149 that refer to alternating voltage are not applicable to the direct-voltage method.

Область применения

1.1 This test method covers the determination of dielectricbreakdown voltage and dielectric strength of solid electricalinsulating materials under direct-voltage stress.

1.2 Since some materials require special treatment, referenceshould also be made to ASTM specifications or to the test methoddirectly applicable to the material to be tested. See Test Method D149 for the determination of dielectric strength of electricalinsulating materials at commercial power frequencies.

1.3 This test method is similar to IEC Publication 243-2. Allprocedures in this test method are included in IEC 243-2.Differences between this test method and IEC 243-2 are largelyeditorial.

1.4 This standard does not purport to address all of the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use. Specific precaution statements are givenin Section 7.