基于ATP-EMTP对配电网雷击过电压的仿真研究

Simulation Study on Lightning Overvoltage of Distribution Network Based on ATP-EMTP

阐述了雷电流模型、配电网各元件计算模型、绝缘子串闪络机理,采用电磁暂态仿真软件ATP-EMTP建立仿真计算模型,比较分析杆塔冲击接地电阻对线路耐雷水平的影响,以及线路避雷器不同安装方案对线路耐雷水平的改善效果。仿真计算结果表明:雷击过电压容易导致绝缘子闪络,通过安装线路避雷器、降低杆塔接地电阻有效地提高了10 kV配电线路耐雷水平,改善了线路耐受过电压的能力。

This paper states lightning current model,calculation model of each element of the distribution network and flash-over mechanism of insulator chain. By using electromagnetic transient simulation software ATP-EMTP,simulating calcula-tion model was established,impact on lightning resistant level of the line by impulse grounding resistance of the tower was compared and analyzed and improvement effectiveness of different installation schemes of line arresters on lightning resistant level were compared and analyzed,too. Simulating calculation result indicated that lightning overvoltage was likely to result in insulator flashover,but by installing line arresters and reducing grounding resistance of the tower,it was able to effective-ly improve lightning resistant level of 1 0 kV distribution lines and overvoltage endurance capacity of lines.