分析同步带常见故障成因，从安装和使用等方面制定相应的预防措施，减少故障发生。
The paper analyzes the cause of the broken-down timing-belt, and finds the ways from the fields of installation and operation etc. to prevent and reduce the faults.
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。
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.
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