Electrical Failure Of Insulators
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high voltage standoff insulators Electrical faults include flashover and breakdown. Flashover occurs on the surface of high voltage epoxy, and burn marks can be seen on epoxy resin insulator, but the insulation performance is usually not lost; breakdown occurs inside high voltage epoxy resin, and discharges through the porcelain body between the iron cap and the iron foot. There may be no traces on the surface, but the insulation performance has been lost, and the arc may also cause high voltage standoff to be completely destroyed. For breakdown, attention should be paid to checking the discharge marks and burns of the iron feet.
