改进型电荷法的变电站电场计算模型设计

Design of Calculation Model of Electric Field for Substations Using Modified Charge Simulation Method

常规电荷法适用于单串导线空间电场强度计算。变电站导线电压等级高档距小,考虑连续三串三相导线对空间电场有叠加效应,引入每串导线的档距和弧垂参量,改进常规电荷法,建立连续三档距三相导线的电场强度计算模型,以适用于变电站空间电场强度计算。通过仿真结果表明,改进型电荷法所得到的电场为连续电场,不像常规电荷法会在导线连接处出现突变。与实测数据对比,改进型电荷法比常规电荷法所得到的数值更接近于实测数据且更准确。

The conventional electric charge simulation method is applied to field strength calculation of single transmission lines.To improve the conventional electric charge method for the substations with each span between lines and line sag,a newly-developed calculation method to adopt the characteristics of higher voltage class and smaller spans are introduced.Thus,the serial three spans and three phases possessing overlay effect are considered to the calculation of the space electric field.The modified electric charge simulation by using the parameters of the span and sag is proposed to set up the electric field model for the transmission lines in serial three spans in substations.Through the simulation comparisons,the proposed method can obtain the continuous electric field unlike sudden change appearing at the nodes of lines.Moreover,the calculated values of the electric field by the proposed method are closer to the actual measured values and more precise.