架空输电线不同位置处雷电感应入射、散射电压数值模拟

Lightning Induced Incidenceand Scattering Voltage Numerical Simulationof Different Positions of Overhead Transmission Lines

利用时域有限差分算法和Agrawal耦合模型,分析计算了架空输电线中点和端点处感应入射、散射电压变化特征。结果表明:1)在线路中心位置处,模拟出的雷击过电压波形呈正极性变化趋势,且中心位置处的过电压峰值要大于线路端点位置峰值;2)架空线上感应出的雷击过电压主要分为散射电压和入射电压两个部分,通过数值计算得出,在线路中点位置处,散射、入射电压峰值相接近,但波形极性相反。在线路端点位置处的耦合过电压主要为散射电压。

The finite difference time domain algorithm and the Agrawal coupling model, the charac- teristics of the lightning induced incidence and scattering voltage at the middle and end points of the over- head transmission line are analyzed and calculated. The results showed that： 1 ） the midpoint in the over- head line position, The waveform of the simulated lightning overvoltage is positive change trend, the peak overvoltage at the center position is greater than the peak value of the line end point; 2） the over- head line induced lightning overvohage is mainly divided into two parts scattering voltage and the inci- dent voltage, through numerical calculation that the midpoint of the overhead line position, scattering, the peak voltage is close to the incident, but the waveform of opposite polarity. At the end of the overhead line, the lightning overvohage is mainly the scattering voltage.