Research On Grounding Mode Of Medium-Voltage Station Service Power System At Hydro Electric Power Station

This research mainly aims at the hydroelectric power station(including pumped storage)power system grounding mode selection for medium-voltage plants of different grounding modes,by theoretical analysis of different grounding modes,Summarizing its characteristics,finding the differences of fault current and non-fault phase voltage in different grounding modes.By fault simulation,comparing the fault current and overvoltage times in different grounding modes three different grounding modes,.analyzing the advantages and disadvantages of medium voltage station service power system neutral grounding mode at hydropower station,at the same time,selecting the medium-voltage station service power system of one pumped storage power station for example,forecasting the development trend of medium-voltage station service grounding mode at hydropower station;In the end,taking the Zhanghewan pumped storage power station as the reforming example,setting out the reforming method,providing feasible plan which contains wiring and equipment,even in the protection devices,indicating the direction of the selection of medium-voltage station service power system grounding mode in the future.