IEC TC 82 WG2 and already have contributed with data of which some is . test development. – Test method to be based on IEC and IEC ;. IEC Electric strength of insulating materials – Test methods – Part 2: Additional requirements for tests using direct voltage. Buy IEC ELECTRIC STRENGTH OF INSULATING MATERIALS – TEST METHODS – PART 2: ADDITIONAL REQUIREMENTS FOR TESTS USING .
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Dielectric Strength ASTM D, IEC
Dielectric Strength is a measure of the electrical 660243-2 of a material as an insulator. Dielectric strength is defined as the maximum voltage required to produce a dielectric breakdown through the material and is expressed as Volts per unit thickness.
A higher dielectric strength represents a better quality of insulator. There are three basic procedures that can be used to determine 60243-22 dielectric strength of an insulator. These procedures are the short-time method, the slow rate-of-rise method and the step-by-step method.
BS EN 60243-2:2014
Each of these three methods has the same basic set-up, which consists of the test specimen placed between two electrodes in air or oil. For the most common test, the short-time method, voltage is applied across the two electrodes and raised from zero to dielectric breakdown at a uniform rate. Breakdown is when an electrical burn-through punctures the sample, or decomposition occurs in the specimen. The rate of voltage rise is determined by the time it takes the sample to reach dielectric breakdown.
The test is sometimes performed in oil to prevent arcing from the electrode to the ground. The recommended specimen type for this test is a 4 inch plaque or larger. Any specimen thickness can be used; however the most common thickness is between 0. Specimens over 2 mm thick are typically tested in oil to decrease the chance of flashover before breakdown.
Dielectric strength is calculated by dividing the breakdown voltage by the thickness of the sample. The location of the failure is also recorded.
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