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ASTM D 149 |
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ASTM D 149 : Standard Test Method for Dielectric Breakdowm Voltage and
Dielectric Strength of Solid Electrical Insulating Materials at
Commercial Power Frequencies
This test method covers procedures for the determination of dielectric
strength of solid insulating materials at commercial power frequencies,
under specified conditions.
Unless otherwise specified the tests shall be made at 60 Hz. However,
this test method may be used at any frequency 25 to 800 Hz. At
frequencies above 800 Hz dielectric heating may be problem.
This test method is intended to be used in conjunction with any ASTM
standard or other document that refers to this test method. References
to this document should specify the particular options to be used (see
5.5).
It may be used at various temperatures, and in any suitable gaseous or
liquid surrounding medium.
This test method is not intended for measuring the dielectric strength
of materials that are fluid under the conditions of test.
This test method is not intended for use in determining intrinsic
dielectric strength, direct-voltage dielectric, or thermal failure under
electrical stress (see Test Method D 3151).
This test method is most commonly used to determine the dielectric
breakdown voltage through the thickness of a test specimen (puncture).
It may also be used to determine dielectric breakdown voltage along the
interface between a solid specimen and a gaseous or liquid surrounding
medium (flashover). With the addition of instructions modifying Section
12, this test method may be used for proof testing.
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