Abstract
This paper investigates the effects of surge wave, giving an exmple of the spring operating mechanism of the SF6 circuit breaker when the helical spring operates as an actuator at high speed. It is proven by the dynamic analysis on the model of spring-mass system that the force of the helical spring decreases due to surge wave during operation. The force of the spring is a function of time in the model and not of its displacement. As the mass on the spring decreases, the force of the spring decreases. The spring characteristics are similar during surge time even if the turns of the coil are changed. High-speed mechanisms should be designed taking account of these characteristics.
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