The dielectric strength of a
material is a measure of the electrical strength of an insulator. It is defined
as the maximum voltage required to produce a dielectric breakdown through the
material and is expressed in terms of Volts per unit thickness. The higher the
dielectric strength of a material the better an electrical insulator it makes.
The Dielectric Strength Test is
the third test required by the electrical safety testing standards. The
Dielectric Strength Test consists in measuring the current leak of a device
under test which has to be lower than the indicated limit from the
international standards.
A Dielectric Strength Tester
(also called hipot tester, dielectric strength tester, flash tester, high
voltage tester) is then used to measure this current.
Let’s understand with video:
How to test the Di-electric
strength of solid material as per ASTM D149 / IEC 60243: The test is conducted
in either air or oil and involves placing the test material between two
electrodes and increasing the voltage between the electrodes until an
electrical burn-through punctures the sample or decomposition occurs. Usually
the specimen is between 0.8 and 3.2mm thick. Samples which are over 2mm in
thickness are usually tested in oil to prevent flash over before breakdown.
How to test the Di-electric
strength of liquid material:
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