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1.The switch oversteptrip incidents of two substations are described and the causes of its misoperation are analyzed. One is the mismatching of line overcurrent time(1 s) and switch instant trip time(0.7 s).
说明了2座变电站开关越级跳闸的事故情况,分析了西门子7SJ600装置在天津电网运行中2次拒动的原因:1次是线路的过电流时间(1s)与开关速断保护时间(0.7s)不配合,造成相应开关跳闸;收藏指正
2.Shunt Trip Shunt trip is a feature added to a circuit breaker or fusible switch to permit the remote opening of the breaker or switch by an electrical signal.
分励脱扣分励脱扣是线路断路器或可熔电闸的一个特性，可通过远程信号来进行分断或转换。收藏指正
3.According to recording data of higher level monitor and control system when main motor drive system for four-high medium plate mill is operated, and relation between armature voltage of DC electromotor and AC input voltage of inverter, trip cause of DC fast automatic switch was analyzed in detail, and specific countermeasure and measures are given.
根据中板四辊轧机主电机传动系统运行时的上级监控系统记录数据，以及直流电机电枢电压与变流器交流侧输人电压的关系，详尽地分析了直流快速自动开关跳闸故障原因，并提出具体的对策及措施。收藏指正
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