基于蒙特卡罗法的500 kV同杆双回线路雷电反击跳闸率计算和分析

Calculation & Analysis on Lighting Back Strike Trip Rate of 500 kV Transmission Lines with Double-circuits on Same Pole Based on Monte Carlo Method

针对雷击现象随机性大的特点,选用蒙特卡罗法并结合电气几何模型和行波法对500 kV同杆双回线路的雷电反击跳闸率进行计算。利用电气几何模型计算绕击率,并分析了接地电阻、绝缘配合等因素对杆塔雷电反击跳闸率的影响。计算结果表明,随着接地电阻的增大,雷电反击跳闸率随之升高;不平衡绝缘较之平衡绝缘对双回线路同时跳闸率的抑制效果更明显;对于同杆双回输电线路,其导线排列相序对反击跳闸率也有影响,不应忽略。

In the light of the randomness of lightning phenomena,Monte Carlo method is used to calculate the back strike trip rate of 500kV double-circuit transmission line combined with EGM and Bergeron-method.EGM is used to calculate the lightning shielding failure rate.Effect of grounding resistor,insulation coordination upon back strike trip rate is analyzed.Calculated results show that the ground resistor is increased with the back flashover trip rate.Non-balance high insulation has more obviously suppression effect than balance effect.Phase order of the tower can also effect the back strike trip rate.