110kV高压输电线路杆塔分流系数的研究

Research of Lightning Distribution Coefficient of the Tower on High-voltage Transmission Line of 110kV

高压输电线路是电力系统的薄弱环节,为解决如何防止输电线路雷击闪络、避免雷击跳闸的难题,研究了关键参数雷电流分流系数及影响它的两个重要方面雷电流幅值和最大陡度。用EMTP软件和不同的雷电流模型仿真模拟,分析不同幅值和不同波头的雷电流对杆塔分流系数影响的结果表明,相同波形雷电流,幅值改变对杆塔分流系数影响较小,而雷电流陡度改变的影响较大。最后用金属磁带测量实验验证了仿真结果的正确性。

The coefficient of tower lightning distribution affects the reliability of the lightning protection of the transmission lines, so it is necessary to research the parameters that affect the coefficient of tower lightning distribution. In this paper, the coefficient of tower lightning distribution as well as two factors of the max. lightning steepness and the lightning which affect the coefficient of lightning distribution is researched. And the simulation is given by means of the calculation program with the electromagnetic transient with different lightning sources models. The influence of the lightning current with the same wave form and the different maxium on the coefficient of tower lightning distribution is analyzed. Then obtained the lightning currents in the same shape and the different maxium have a little effect on the tower coefficient of lightning distribution. But the lightning steepness affects the coefficient of tower lightning distribution more. Finally the result was tested using the measurement method of the magnetic tapes and the result accuracy is confirmed.