Abstract
Operating overvoltage appears when a circuit breaker, especially a high-voltage circuit breaker, opens and closes, which causes strong electromagnetic interference (EMI) and even damage to power and electrical equipment near the circuit breaker We analyze the factors which create operating overvoltage. Based on the breakdown theory of critical electric strength, the sensitivity of the gap between open contacts to the non-uniform coefficient of electric field is considered, the characteristics of dielectric recovery are calculated, methods of reducing or avoiding the operating overvoltage are put forward. They are realized by changing the simple moving characteristics of the circuit breaker, such as the initial phase confirmed in closing, the current phase selected and the diameter of the drain oil aperture of the operating mechanism being adjusted in the opening of an intelligent operation circuit breaker.
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