Current Discharge Of Grounding System And Surge Arrester

The key to whether lightning surge arrester can work effectively lies in the grounding loop. The lightning protection grounding resistance of the charging station should not exceed 4Ω, and the protective grounding resistance should not exceed 10Ω. This low resistance design ensures that the overcurrent of the surge arresters can be quickly discharged into the grounding grid. When the grounding resistance increases, the surge current stays in the system for a longer period of time, which will weaken the protection capability of the 11kv lightning arrester. In areas with high soil resistivity, it is necessary to increase the number of grounding electrodes or adopt chemical resistance reduction measures to maintain the current discharge efficiency of the 15kv lightning arrester system.