![]() The voltage is applied to the test electrodes at the preferred starting voltage in steps and duration until breakdown occurs. In this test method, the voltage is applied to the test electrodes from the starting voltage 50% of the breakdown voltage until breakdown occurs. Breakdown is defined as when an electrical burn- through punctures the sample or decomposition occurs in the sample. In this method, the voltage is applied across the two electrodes and increased continuously at a uniform rate (500 V/sec) until the breakdown occurs. The measurement of dielectric strength is usually carried out either by the: The most generally used standard tests to calculate dielectric strength are ASTM D149 or IEC 60243-1 (ofcourse there exist several other methods as well, but they are not discussed here). » How to Calculate the Dielectric Strength of Plastic ![]() » Dielectric Strength Values of Several Plastics Unit for Dielectric Strength is kV by mm of thickness (customary units sometimes refer to in V/mil). » The medium that surrounds the insulator » The rate with which the field is increased, and » The shape of the plastic and electrodes » Thin films in high speed digital circuitry » Development of materials for energy storage applications It is an important property sought for materials used in applications where electrical field is present and is a vital parameter for electrical industry applications. The higher the value, the more electrically insulating a material is. In other words, it is the voltage per unit thickness at which a material will conduct electricity. It is an indicator of how good an insulator a material is. Or it can be defined as the measure of dielectric breakdown resistance of a material under an applied voltage and is expressed as Volts per unit thickness. ![]() Dielectric Strength reflects the electric strength of insulating materials at various power frequencies.
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