Complex Geographical Environment Substation Grounding System Design And Research

In our design of grounding system in substation, compound grounding network is adopted widely which is composed of horizontal grids and vertical grounding rods. This method apply to even soil structure and general substation. But with the increasing of electric power system short-circuit capability and the reduction of grounding resistance demand, and with the increasing of diminutive and various substations in the new situation, this ordinary grounding system and calculation method can't suit the new demand.Because of the problem mentioned above, we analyses the substation grounding resistance theory and factors which affect the substation grounding resistance. This paper first lists steps which can decrease the grounding resistance, then chooses the best grounding ways of different substations in different geographical environments, last shows different grounding ways being practiced in electric power system.This paper analyzed and compared several grounding system projects in different geographical environment of Wenzhou. Adopting suitable and different ways of decreasing grounding resistance in different substations or adopting comprehensive ways in the same sudstation can meet the demands of different substation grounding resistance and can also meet the technical and economical demands. Those practical applies have very important significance for electric network construction and operation.