The protection of high-voltage insulators from power-arc damage

This paper summarizes the results and conclusions of an experimental investigation into the reduction of damage by power-follow-through arcs on various types of high-voltage insulators. Where normally used, protective fittings of the usual type have been tested, and suggestions have been made for modifications to the fittings so as to give greater protection. The effects of wind have been taken into account. Only 11 and 33 kV insulators have been tested, but the investigation has been designed to obtain information which can be applied to the larger units at the highest voltage. Since any application in service of these results must depend upon economic considerations, some information is included on the amount of arc damage occurring in service to high-voltage insulators, both in this country and abroad.