关键词: 水电站, 油罐接地, 跨接导线, 接地引下线, 接地反击

Abstract: The authors analyze the potential rise when the metal pipe of oil tank of hydropower station is in the condition of short-circuit current, which would cause the spark accident due to the breakdown of oil film between pipe flanges. And, the jumper wire of the metal pipe not only prevents electrostatic, but also prevents the grounding back striking accident. At the same time, the authors analyze the back striking phenomenon of the grounding down lead of main transformer to nearby secondary equipments after problem occurs. Finally, the relevant countermeasures are put forward to provide technical support for the safe operation of hydropower station.

Key words: hydropower station, grounding of oil tank, jumper wire, grounding down lead, grounding back striking