Through cause analysis, the authors believe the operational power supply failure leading to the disability of actuator of the breaker may be the possible cause.
分析了事故原因，指出操作电源故障致使操作机构不能正常动作是事故的可能起因。
It is suggested that the excitation transformer power be introduced as the operational power supply for the regulator, and the rotor overvoltage protection of the unit be modified.
为此，提出了防范此类事故的对策，建议引入励磁变压器电源作为调节器的工作电源，并对该机组的转子过电压保护进行改造。
Emergency power supply operational.
应急电源工作。
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