基于多阶FDTD雷电感应过电压计算新方法

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Abstract Traditional empirical formula methods exist great errors and limitations of factors considering in estimating the overhead line lightning induced over-voltage. Therefore, a new numerical method based on multiple order finite difference time domain(FDTD) was proposed in this paper. The lightning electromagnetic pulse(LEMP) near the return channel is obtained by using the FDTD method; The Agrawal differential equations of coupling circuit are solved by the Second-order FDTD method. Based on the two steps, the over-voltage and over-current of overhead line excited by LEMP in different conditions can be obtained. This method achieves high stability and high precision numerical calculation by using multiple order FDTD technology, and compered with observed data from rocket triggered lightning flash, it was verified to be correct. The simulation results showed that: the effect of return stroke current amplitude on the induction voltage amplitude is significantly, and little on waveform; The effect of return stroke current wave gradient on the induction voltage waveform is obviously, and little on amplitude; There is "shielding effect" between multi-conductor, and the “effect” affected by conductor arrangement obviously.

Key words： Finite difference time domain (FDTD) 2nd FDTD lightning electromagnetic pulse (LEMP) lightning induced over-voltage

Received: 10 September 2014 Published: 14 September 2015

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