Before the accident, the No. 2 unit (rated capacity 65 MW) of a hydropower plant had an active power of 64 MW and a reactive power of 110 Mvar. According to the needs of equipment maintenance on that day, the operator switched the 400 V I section of the power supply to the III section. According to the plant operation procedures, the 400 V I section of the power supply switch for the power supply should be disconnected first, and the 400 V III section contact switch should automatically supply power by relying on the automatic standby power supply device (BZT). After the operator (under the supervision of the guardian) disconnected the 400 V I section of the power supply switch for the power supply in the 400 V distribution room, he immediately found that the 400 V III section BZT did not operate, so he manually closed the III section contact switch 4ZKK.
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