其功能设定菜单有：OM Activety(电机过热动作)、OM Ok relay open(OK 继电器断开) 6、External Fault(外部故障) 外部故障（端子15 上无24V）其主要作用是对装置外围设备的保护，如： 监控直流主回路、励磁回路、吸收回路的快熔等其他设备是否...
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external fault occurs 外部故障时
external fault removed 外部故障切除
external fault clearance 外部故障切除
External control of fault timing 外部控制故障时间
external conversion fault 区外转换故障
External unknown fault input 外界未知故障输入
Long-term run experiences make it clear that differential protection can distinguish between internal fault and external fault of transformer. So the key of transformer protection is to distinguish between magnetic inrush and internal fault currents.
长期的运行经验表明差动保护能够准确区分变压器内部故障和外部故障，所以变压器差动保护的主要问题集中在励磁涌流和内部故障电流的鉴别上。
参考来源 - 变压器暂态故障仿真及基于支持向量机的故障辨识·2,447,543篇论文数据，部分数据来源于NoteExpress
It is found that the two parameters aren't influenced by external fault and magnetizing inrush current, which ensures good selectivity.
理论上分析可以得到，这两个参数不受外部故障和励磁涌流的影响，因此具有很好的选择性。
After an external fault of transformer is cleared, the transient flux may enter into the saturation region, and a recovery inrush may be produced.
变压器外部故障切除后，暂态磁通可能超过变压器铁心的饱和点，从而产生一定的恢复性涌流。
Troubleshooting ideas: first, in principle, rule out the control circuit fault - and then ruled out engine failure itself - after the exclusion of other external fault.
排除故障思路：原则上先排除控制电路故障——再排除发动机自身故障——后排除其它外部故障。
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