The ±1100 kV line has 4 base towers with DC arresters installed, 3 bases are located in Gansu, and the other is located in Haiyuan County, Ningxia. The DC arresters installed on the towers are the only set of high-voltage line arresters in Ningxia Power Grid. Since a single lightning arrester weighs 3 tons and the tower is in a cornfield, the cost of using a crane to experiment is relatively high and there are significant safety hazards. For this reason, State Grid Ningxia Electric Power tried for the first time to carry out DC reference voltage and leakage current tests without removing the arrester at high altitudes.
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