Abridgment of calculation of mechanical performance of oil circuit breakers

This paper describes the methods of calculating mechanical performance of a typical rotary type oil circuit breaker, operated by a spring-actuated motor control. For a given spring characteristic, the motion of the breaker is predicted, and time required to reach any position, and the speed at that position, calculated. General formulas are set up. A mechanical test is performed on a specific breaker and a comparison made between calculated and tested results.