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Breakdown Voltage and Permittivity

05/14/2009 2:19 PM

tell me pls if there is a relation between breakdown voltage rating of a material with permittivity of that material, as far as i know the dielectric constant is matter which has to do with making capacitors and i wonder the insulation level and permitivity...

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#1

Re: Breakdown Voltage and Permittivity

05/14/2009 10:40 PM

No across the range of materials, but if it is a single material, relationships are there , but to be experimentally found (no formula) as far as I know.

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#2

Re: Breakdown Voltage and Permittivity

05/15/2009 11:35 AM

The dielectric constant, also called relative permittivity, is the ratio of flux density to the electric field intensity in a gas, solid, or liquid dielectric.

For a vacuum, the value of ε0 = 8.85 x 10-12 farads / meter. Thus, the ratio of the permittivity of any dielectric to that of a vacuum is called the relative permittivity, or εr = ε/ε0. The value of ε for any material then is ε = εrε0. The relative permittivities of various dielectrics are published in many texts, handbooks, etc.

Having said all that, and as pointed out in an earlier post, dielectric constant is only one important aspect, the other is dielectric strength, and that is a function of the specific dielectric, shape of the electrodes, distance between the electrodes, electrical field, voltage waveshape, and environment (temperature and pressure).

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