Standard Test Method for
Dielectric Breakdown Voltage and Dielectric Strength of
Solid Electrical Insulating Materials Using Impulse Waves1
This standard is issued under the fixed designation D 3426; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
a superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1.1 This test method covers the determination of dielectric
strength of solid electrical insulating materials under
simulated-lightning impulse conditions.
1.2 Procedures are given for tests using standard 1.2 by 50
µs full-wave impulses.
1.3 This test method is intended for use in determining the
impulse dielectric strength of insulating materials, either using
simple electrodes or functional models. It is not intended for
use in impulse testing of apparatus.
1.4 This test method is similar to IEC Publication 243-3. All
procedures in this test method are included in IEC 243-3.
Differences between this test method and IEC 243-3 are largely
1.5 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 precaution
statements are given in Section 9.
2. Referenced Documents
2.1 ASTM Standards:
D 149 Test Method for Dielectric Breakdown Voltage and
Dielectric Strength of Solid Electrical Insulating Materials
at Commercial Power Frequencies2
D 374 Test Methods for Thickness of Solid Electrical Insulation2
D 2413 Test Methods for Preparation and Electrical Testing
of Insulating Paper and Board Impregnated with a Liquid
2.2 American National Standard:
C 68.1 Techniques for Dielectric Tests (IEEE Standard No.
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