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基于多阶FDTD雷电感应过电压计算新方法

, PP. 336-343

Keywords: 时域有限差分,二阶时域有限差分,雷电电磁脉冲,雷电感应过电压

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Abstract:

传统的经验公式法估算架空线雷电感应过电压误差大且存在影响因素考虑不全面的局限性.对此提出一种基于多阶时域有限差分的数值计算新方法.该方法采用一阶时域有限差分(FDTD)法计算回击电流所引发的雷电电磁脉冲(LEMP);采用二阶时域有限差分(FDTD2nd)法求解耦合电路的Agrawal微分方程,计算不同工况时LEMP激励下架空导线的感应过电压.该方法采用多阶FDTD技术实现了高稳定性和高精度的数值计算,与火箭引雷试验对比证明计算准确性.仿真计算表明回击电流幅值对感应电压幅值影响明显,对波形影响小;回击电流波头陡度对感应电压波形影响较大,对幅值影响较弱;多导线之间有“屏蔽效应”,该效应受导线排布方式影响明显.

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