CableDataSheet, Cable and Wire Technical Consulting Service

What are dielectrics?

Dielectrics are materials, which are generally non-metallic, that have high resistivity, due to which the circulation of current through them is very weak (forward or  leakage current). Taking advantage of this characteristic, they are used as insulators to halt electrons, or to delimit the path they should take.

DIELECTRIC STRENGTH

This is the maximum voltage gradient that a material can withstand before being destroyed by breakdown; it is expressed in kilowatts per millimetre. Its value is
influenced by the conditions of the test. Even supposing that a field free of distortion (and consequently perfectly uniform) is obtained, and that the properties of the materials to be assayed are stabilized by eliminating all impurities and moisture, there is still the influence of the time of the test. The breakdown mechanism in long test times is a thermal phenomenon (heating up due to dielectric loss and charging currents), while in short times, these phenomena do not play a role and we find physical breakdowns due to the electrical forces that are present. In general, dielectric strength decreases as the test time increases, in accordance


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