Research on lightning intruding waves in 220 kV GIS substation

The lightning intruding waves in 220 kV GIS substation model was built by using ATP-EMTP software, calculate the lightning over-voltages on electric equipment in substation with different running modes, different grounding resistance and lightning shielding failure. The results show that the maximum over-voltage on electric equipment happened in single bus with single transformer; The smaller the grounding resistance, the smaller the over-voltage value on electric equipment in substation; the lightning shielding failure will not cause harm to substation. Finally, this paper used statistical methods to calculate the years of the safe operation of the substation. It is concluded that the safe running times of substation can meet the requirement when arresters were installed at the incoming lines and the entrance of transformer.