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ASTM D 149 REV A Document Information:
Title
Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
ASTM International
Publication Date:
Sep 10, 1997
Scope:
This test method covers procedures for the determination of dielectric
strength of solid insulating
materials at commercial power frequencies, under specified
conditions.(Footnote 2,3)
Unless otherwise specified, the tests shall be made at 60 Hz. However,
this test method may be used
at any frequency from 25 to 800 Hz. At frequencies above 800 Hz,
dielectric heating may be a
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 strength, 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
(flash-over). With the addition of instructions modifying Section 12,
this test method may be used
for proof testing.
This test method is similar to IEC Publication 243-1. All procedures
in this method are included in
IEC 243-1. Differences between this method and IEC 243-1 are largely
editorial.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. Specific
hazard statements are given in Section 7. Also see 6.4.1.
Footnote 2 - Bartnikas, R., Chapter 3, "High Voltage Measurements,"
Electrical Properties of Solid
Insulating Materials, Measurement Techniques, Vol. IIB, Engineering
Dielectrics, R. Bartnikas,
Editor, ASTM STP 926, ASTM, Philadelphia, 1987.
Footnote 3 - Nelson, J. K., Chapter 5, "Dielectric Breakdown of
Solids," Electrical Properties of
Solid Insulating Materials: Molecular Structure and Electrical
Behavior, Vol. IIA, Engineering
Dielectrics, R. Bartnikas and R. M. Eichorn, Editors, ASTM STP 783,
ASTM, Philadelphia, 1983.
Keywords:
- breakdown
- breakdown voltage
- calibration
- criteria of breakdown
- dielectric breakdown voltage
- dielectric failure
- dielectric strength
- electrodes
- flashover
- power frequency
- process-control testing
- proof testing
- quality-control testing
- rapid rise
- research testing
- sampling
- slow rate-of-rise
- step-by-step
- surrounding medium
- voltage withstand
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