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万安水电站采用六氟化硫气体绝缘变电站（简称ＧＩＳ）。结合万安水电站的实际情况，对于按地开关的运用进行了分析。分析认为，快速接地开关（ＦＥＳ）对保护ＧＩＳ内部故障尚存在问题．故对变电站线路侧按地开关的选型进行了论证，提出了将ＦＥＳ改型为维修型接地开关（ＥＳ）的依据。此外，设计还提出了将接地开关的接地体与外壳绝缘的要求，这对主导电回路的通流能力的判断、绝缘电阻测量等均提供了方便。
Wan An hydropower plant using sulfur hexafluoride gas insulated substation (referred to as GIS). Combined with the actual situation of Wanan hydropower station, the switch for the use of an analysis. Analysis, rapid earthing switch (FES) protection of GIS internal problems still exist problems. Therefore, the selection of on-line switches in substation line side is demonstrated, and the basis for retrofitting FES into maintenance-type grounding switch (ES) is proposed. In addition, the design also proposed the ground switch grounding body and the shell insulation requirements, which determine the flow through the main circuit to determine the flow resistance, insulation resistance measurements provide a convenient.