Study on Closing Spring Fatigue Characteristics of High Voltage Circuit Breaker

Abstract

Abstract One of the most causing closing fault of high voltage circuit breaker is closing spring failure. In order to avoid such closing fault, this paper analyzed the relationship between energy of closing spring and its load, as well as the experiment carried out to get the minimum energy when closing. The time-varying static stress relaxation curve of closing spring force was obtained by analogy the real working condition of high voltage circuit breaker which closing spring is compressed for a long time, the operation time-varying dynamic stress relaxation curve of closing spring force was also obtained by carrying mechanical endurance test. In the end, established the model of closing spring storage life and fatigue life, closing spring life prediction and fault early warning of high voltage circuit breaker was then realized.