What happens insulators when high voltage passes through transmission lines whether it breaks or lose it's insulating property?

What happens insulators when high voltage passes through transmission lines whether it breaks or lose it's insulating property?
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Insulators have its own dielectric property.
Dielectric strength depends on voltage. If high voltage appears in transmission line an dielectric breakdown is happens.
For e.g. Transformer oil has dielectric strength if voltage is increased at this instant a spark will be produced it indicates dielectric breakdown.

1 Answer

Answer :

I think it will breaks when it crosses breakdown voltage .
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