基于BLT方程的架空输电线路雷电过电压峰值快速计算研究

Research on Fast Calculation of Lightning Overvoltage Peak Value of Overhead Transmission Line Based on BLT Equation

文章根据电偶极子算法得到空间任意点的电磁场,其次通过BLT方程,从频域角度计算出线路上的感应过电压,避免了时域上计算的复杂、耗时性。首先利用规程法对文章计算模型结果进行了验证,其次研究了架空线中点与闪电通道不同水平距离处在架空线中点、端点位置处的感应过电压值,研究表明:在架空线中点位置处的过电压均为单极性的,而在架空线末端的位置处存在双极性的变化趋势,端点处的过电压峰值等于中点处50%。

In this paper,the electromagnetic field at any point in space is obtained according to the electric dipole algorithm.The induced overvoltage on the line is calculated from the frequency domain by BLT equation,which avoids the complexity and time-consuming of the calculation in the time domain.Firstly,the results of the model are verified by the method of rules.Secondly,the induced overvoltage at the middle point and the end point of the overhead line at different horizontal distances from the lightning passage is studied.The results show that the overvoltage at the middle point of the overhead line is unipolar,while at the end of the overhead line,there is a trend of bipolar change,and the peak value of the overvoltage at the end point is equal to 50%at the middle point of the overhead line.