基于ATP-EMTP仿真软件的输电线路雷击跳闸率多因素对比分析研究

Multi-Factor Comparative Analysis of Lightning Trip Out Rate in Transmission Line Based on ATP-EMTP Simulation Software

通过电磁暂态仿真程序ATP-EMTP,建立了110 kV输电线路的雷击分析模型,主要包括:雷电流模型、杆塔模型、绝缘子串闪络模型等,该模型可以真实地反映雷电流在杆塔上的传播过程.然后分别利用规程法和ATP仿真法进行了计算与分析,得到线路在不同条件下的跳闸率;分析了杆塔高度、冲击接地电阻以及线路绝缘水平等因素对雷击跳闸率的影响.结果表明:在同等情况下,ATP-EMTP仿真计算的反击跳闸率略高于规程法的计算值;随着杆塔高度的降低、杆塔冲击接地电阻的减小、绝缘强度的增强,反击跳闸率减小.

The lightning strike analysis model of 110kV transmission line is established by using the electromagnetic transient simulation program ATP-EMTP,which mainly includes:lightning current model,tower model,and insulator string flashover model,etc.This model can truly reflect the transmission process of lightning current on the tower.The calculation and analysis on the trip rate of the line under different conditions are carried out respectively by using the rule method and ATP simulation method.The influence of the tower height,impulse grounding resistance and line insulation level on the lightning trip out rate is analyzed.The results show that:under the same circumstances,the ATP-EMTP simulation calculation of the counterattack trip rate is slightly higher than the calculation value of the regulation method;with the tower height and the tower impulse grounding resistance decreasing and the insulation strength increasing,the counterattack trip rate decreases.