Grounding resistance measurement method of largegrounding grids with short current wire
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Abstract:
The 0.618 method for grounding resistance measurement has long wire lead defect. By calculating and analyzing the groundpotential of a large number of grounding grids which are different in shape, area and rodarrangement style using computer numerical method, it presents that the grounding grids can be equivalent to disc shape grounding electrodes. A new method of grounding resistance measurement is presented that taking the currentelectrode wire as long as the longer side length of grounding grids and voltageelectrode wire as 0.509 times long as the currentelectrode wire. The measurement accuracy of this method is testified by experiment in field. The proposed method has much shorter wire than 0.618 method, it is suited to grounding resistance measurement of large grounding grids.
