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For a system corresponding mainly to a uniform electric field, the flashover voltage is slightly...

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Electrical Engineering

For a system corresponding mainly to a uniform electric field, the flashover voltage is slightly lower than the breakdown voltage of air alone, for the same electrode gaps. The decrease in the flashover voltage is due to the presence of small air pockets between the electrodes and solid dielectric, the influence of moisture and the non-uniformity of the electric field resulting of the difference between the permittivity of both the solid and that of air. The non-uniformity of electric field increases with the voltage because of the surface charging that takes place in this situation.

Answer & Explanation Solved by verified expert
4.0 Ratings (439 Votes)
First you need to know what is flash over voltage and puncture voltage Puncture voltage It is the volatge that appeared inside the insulating material The arc due to puncture voltage flows inside the insulating material and makes the insulator as conductor by damaging it    See Answer
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