Dielectric Strength

An insulator or dielectric is a substance within which there are no mobile electrons necessary for electric conduction. However, when the voltage applied to such an insulator exceeds a certain value, and then it breaks down and allows a heavy electric current to flow through it. This means that the dielectric loses its in insulating properties.

Dielectric Strength of an insulator or dielectric medium is given by the maximum potential is given by the maximum potential difference which a unit thickness of the medium can withstand without breaking down. Its unit is kV/mm.


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