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Common performance parameters of insulating materials

Update:27-10-2020
Summary:

1. The current consists of three parts: instantaneous c […]

1. The current consists of three parts: instantaneous charging current, absorption current, and leakage current.

2. Insulation resistance: the quotient obtained by dividing the DC voltage between the two electrodes in contact with the insulator or sample by the total current passing through the two electrodes.

3. Volume resistance: the quotient obtained by dividing the DC voltage applied between the two electrodes placed on the two opposite surfaces of the sample by the steady-state current formed between the two electrodes, that is, the quotient between the two opposite surfaces of the insulating material resistance.

4. Volume resistivity: The quotient obtained by dividing the intensity of the DC electric field in the sample by the steady-state current density can be regarded as the volume resistance in a unit cubic volume.

5. Surface resistance: the quotient obtained by dividing the DC voltage between two electrodes on the same surface of an insulator or sample by the current between the two electrodes after a certain electrochemical time.

6. Surface resistivity: the quotient obtained by dividing the DC electric field intensity on the surface of the insulating material by the current line density.

7. Dielectric—all substances that can establish polarization under the action of an electric field. Insulating material is a kind of dielectric.

In addition to the above parameters, many other parameters are also used, which together determine the overall performance of the insulating material.

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