Considerations in Establishing Standard of Meckanical Loads on Oil-Circuit-Breaker Bushings

The present bushing standards which cover electrical and major dimensional requirements provide a considerable degree of interchangeability. A standard of mechanical bushing load requirements is needed for oil-circuit-breaker applications. A standard of static loads has been proposed. This paper deals with an extension of this proposal and offers considerations for establishing adynamic loading standard. It also presents a method of producing, by the use of explosive charges, dynamic forces similar to those recorded under actual interrupting conditions.