Trip-free reclosing circuit-breaker mechanism

THE DEMAND FOR ever higher interrupting capacities and ever shorter interrupting and reclosing times of power circuit breakers has presented a challenge to the designer of the circuit-breaker operating mechanism. The gauge of this challenge is the achievement of interrupting times as short as 3 cycles and successive reclosing times, without intentional time delay, as short as 15 cycles, all without sacrifice of simplicity and reliability.