The research of the power plant and substation grounding network reconstruction Inner Mongolia region

As the further growth in electricity using of Chinese urban residents, in order to meet the requirements of the city, more and more 220kV transformer substations have been constructed in the city as distribution substations. the character of such substations are: 220kV and 110kV high-voltage electrical equipment use GIS; substation area is small; the increasing power system capacity caused short circuit current of grounding fault growing. The outstanding issues of substation grounding design is that the ground area is small (5000 ∼ 10000m2), and soil resistance rate is high (normally 500 ∼ 1200Ω · m or higher). There is no external ground conditions laid and local geological conditions are poor, and soil receptivity is high. Substation using reducing agent make the grounding grid of substation corroded very serious; soil around the net salinity and soil moisture make serious corrosion of the grounding.