高土壤电阻率地区500 kV变电站过电压防护复合接地研究

摘要

Lightning overvoltage is one of the main causes of power system over-voltage. The grounding method in high soil resistivity area affects the over-voltage. Aiming at the high soil resistivity area in 500kV substation, the compound grounding method was deeply explored. Then the mathematical model of grounding net with lighting condition was built and the resistance reduction scheme was designed for high soil resistivity area. ATP simulation results show that the effectiveness of the design in this paper, which has certain practical reference.%雷电过电压是造成电力系统过电压的主要原因之一,高土壤电阻率地区500kV变电站的接地方式影响过电压水平.深入探索复合接地方法,建立雷电流下复合接地网的数学模型,提出适合高土壤电阻率地区接地网降阻方案.ATP仿真结果验证了该方案的有效性,具有一定的工程应用价值.