Reducing the transmission line tower impulse grounding resistance is an important measure to improve the lightning withstand level and the stability of power system. This paper adopts the method of simulation experiments

research the influence of branch type

branch location

branch number and branch length on the box with radiation grounding devices’ impulse characteristics in high soil resistivity model. Results of the experiments showed that vertical branch is better than horizontal branch on reducing the impulse grounding resistance; the branches have a best location and an effective use of length that can reduce the impulse grounding resistance ineffectively. According to the results of the experiments

add vertical branches reasonably can effectively reduce the impulse grounding resistance in high soil resistivity area.