Computation of power line structure surge impedances using the electromagnetic field method

2001 IEEE/PES Transmission and Distribution Conference and Exposition. Developing New Perspectives (Cat. No.01CH37294) Pub Date : 2001-10-28 DOI:10.1109/TDC.2001.971317

F. Dawalibi, W. Ruan, S. Fortin, J. Ma, W. K. Daily

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引用次数: 16

Abstract

The power line structure surge impedance is computed using an electromagnetic field approach for various transmission and distribution line structure configurations (ranging from a single wood pole to lattice steel towers) including their grounding systems. The influence of the soil resistivity and different grounding system configurations on the structure surge impedance has been studied. The structure surge impedances are computed for three impressed surge current waveforms: (a) step current wave; (b) ramp current wave; and (c) typical double-exponential lightning surge current. The computed surge impedances using the electromagnetic field approach are compared with those obtained using formulae based on a geometrical model of the power line structure. It is shown that the computed values based on the electromagnetic field theory are, to various degrees, different from the values computed using the formulae based on the geometrical model of the structure. The study also reveals that: (a) the surge impedance of a lattice steel tower decreases only slightly when the soil resistivity is increased from 0.1 /spl Omega/-m to 500 /spl Omega/-m; and (b) when the footing resistance is held constant, the surge impedance of a single pole changes by about 5%, when counterpoises instead of rod clusters are used.

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用电磁场法计算电力线结构浪涌阻抗

电力线结构浪涌阻抗使用电磁场方法计算各种输配电线路结构配置(从单木杆到格子钢塔)及其接地系统。研究了土壤电阻率和不同接地系统配置对结构浪涌阻抗的影响。计算了三种外加浪涌电流波形的结构浪涌阻抗:(a)阶跃电流波形;(b)斜流波;(c)典型双指数雷电浪涌电流。将电磁场法计算的浪涌阻抗与基于电力线结构几何模型的公式计算的浪涌阻抗进行了比较。结果表明，基于电磁场理论的计算值与基于结构几何模型的公式计算值有不同程度的差异。研究还表明:(a)当土壤电阻率从0.1 /spl ω /-m增加到500 /spl ω /-m时，格构钢塔的浪涌阻抗略有下降;(b)当基脚电阻保持不变时，当使用平衡器而不是棒簇时，单极的浪涌阻抗变化约5%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2001 IEEE/PES Transmission and Distribution Conference and Exposition. Developing New Perspectives (Cat. No.01CH37294)

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