线路故障过电压下变电站内空间电场的分析

Analysis of the Electric Field in Substation on Power Line Faults Overvoltage

本文提出了一种分析计算变电站内空间电场强度的方法。该方法基于矩量法和复电阻率的概念,以导体上的漏电流为未知量,利用导体上的电位连续性建立方程组,最终可以求解得出空间各点的电场强度。该方法可以在考虑架构等复杂导体结构情况下分析架空线路上产生的空间电场,使计算结果更加准确。本文的计算方法适用于较低频率时的空间电场分析,结合傅里叶变换,可以用于线路故障过电压情况下的空间电场分析。

Based on method of moment and complex resistivity, a method to analyze the electric field in substation was presented. With the leak currents on conductors as unknown variables, the equation group was established based on the potential continuity on conductor. To make the resulting electric field intensity in space more reasonable, the complicated conductor structure was also treated. The presented method is applicable to the electric field of lower frequency. Combined with FFT, the electric field under the case of fault overvoltage can also be analyzed.