Relationship between grounding resistance connected to surge arresters and lightning surge behavior observed in low-voltage equipment

We have clarified the relationship between the grounding resistance of surge arresters and the lightning surge behavior observed in low-voltage equipment by Electro-Magnetic Transients Program analysis. The result shows that the grounding resistance of surge arresters installed on a pole with a pole transformer can be increased to some extent without decreasing the lightning protection level of the low-voltage equipment by the installation of an overhead ground wire and the shortening of the interval between concrete poles with surge arresters. A reduction in the cost of grounding construction can be expected.