With the much higher operating voltages now in use the projected voltage transients or surges due to switching i. e. the opening and closing of circuit breakers, have become the major consideration.

目前随着更高工作电压的使用，由于断路器分闸、合闸操作所引起的电压暂态过程或过电压．已成为主要考虑的方面。

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These factors including distribution of circuit breakers closing Angle, rated voltage of MOA and the insulation level of transmission line are considered.

同时还研究了断路器合闸相位角分布规律、MOA的额定电压、线路绝缘水平等因素的影响。

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Synchronous closing is an intelligent control technique. It can make the moving and stationery contact-header of circuit breaker to close on the specified phase angle of the power system voltage wave.

同步关合是指断路器动、静触头在系统电压波形的指定相角处关合，以减小合闸操作的过电流和过电压的一种智能操作技术。

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