外场激励下架空线响应分布规律的概率分析
Research on probability distribution of coupling responses of transmission lines externally excited by electromagnetic field
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摘要: 应用蒙特卡罗法和传输线耦合响应计算公式分析了瞬态外场激励下传输线耦合响应的分布规律。分析对象为二导体架空线和以大地为回路的多导体架空线。分析中将电磁波的入射参数，包括极化角、入射角和方位角作为一组随机变量，并由计算机随机产生。应用瞬态外场激励下二导体传输线终端耦合响应的解析公式和多导体传输线节点导纳方程分别分析端接传输线耦合电流和耦合电压响应绝对值的峰值，并得出响应的概率分布曲线。当传输线入射参数在［0,π/2］范围内变化时，对于二导体架空线终端电流而言，随着终端端接电阻的不同，架空线近端与远端的电流响应绝对值峰值的概率分布曲线不同。对于共地三导体架空线来说，在接相同端接电阻的情况下，远端高电压分布概率大于近端的分布概率，中间导体近远两端在高电压区域分布概率要比两边导体低。Abstract: Based on the nodal admittance method which is convenient to analyze the responses at terminals of multiconductor transmission lines excited by EM field, Mento Carlo method for the characterization of wiring-harness susceptibility to external interference was applied. Field-coupling onto two-conductor transmission line and multiconductor transmission line loaded by terminal resistances were considered. The external field was modeled by a plane wave with random parameters as polarization angle, incident angle and azimuth angle generated by computer. The response formulas of two-conductor and multiconductor line were applied, and the peak value of voltages or currents was computed for every set of random values. For incident parameter range of ［0, p/2］, the probability distributions of term
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