DC deep well grounding electrode has high engineering value due to it’s small footprint and easy site selection. Because a single deep well grounding electrode’s maximum diagonal distance is less than one meter

it is obviously not appropriate to measure the grounding resistance directly by using the manual recommended 5 times diagonal distance from the manual wiring. Therefore

we built a DC deep well grounding electrode model and calculated its grounding resistance. And studied the law of the surface potential distribution under the action of current field created by current electrode

combining the calculated grounding resistance value

we analyzed the layout requirements for voltage electrode. By changing the position of current and voltage electrode

we studied the relationship between measurement error and wiring distance

and put forward a scheme of current and voltage electrode layout for the measurement of the grounding resistance. The scheme of the research was used to measure the grounding resistance of the deep well grounding electrode

which verified it’s validity and accuracy. Finally

we analyzed the similarities and differences of resistance measurement between deep well grounding electrode and horizontal and vertical grounding

which provides a reference for the measurement of deep grounding resistance and related standards revision.