Measuring electrode arrangement for grounding resistance measurement of grounding system in vertical-layered soil

How to precisely measure the grounding resistance of a substation is the fundamental factor to guarantee the safe operation of power system. The arrangement rules of measuring electrodes for the grounding resistance measurement of grounding system in vertical-layered soil were analyzed by numerical method. The demanded correct site for the potential rod under different directions is obtained when the grounding system is arranged in different soil model. The analysis states that scientific and suitable measurement method is to correctly choose the site for the potential rod according to the soil and grounding system structures in order to precisely measure the grounding resistance, and realizes the difference between the measuring results and actual grounding resistance.