Abstract: The basic method of optimized design of substation grounding grid was introduced, and the selection of measurement points and the correct measurement method, which can reduce the influence of environment factors on measurement result, were introduced too. Taking an 110kV substation as example, the potential distribution was measured accurately, the measurement data were analyzed, and the more accurate experiment results were obtained. Based on the result analysis, in order to improve the potential distribution, some measures were proposed to improve the performance of the grounding grid effectively.

Key words: optimized design of grounding grid, potential distribution measurement, three stage method, experiment