屏蔽输电线路设计中最佳屏蔽角的确定

R. Holt, T. Nguyen
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引用次数: 3

摘要

本文提出了传输线导体在直击雷击下的暴露距离的一般表达式,包括击距、导体高度、横臂长度和屏蔽角。表达式适用于不同的电几何模型(EGM)。为地线设计中确定最佳屏蔽角提供了依据。暴露距离的约束最小化给出了屏蔽角的最佳值。表达式使用发布的字段结果进行验证。利用所建立的一般表达式,进行了研究,以确定最佳屏蔽角所依赖的因素,并量化其依赖程度。本文评价了最佳屏蔽角对不同电磁干扰的灵敏度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Determination of optimal shielding angles in shielded transmission line design
The paper develops a general formulation that gives expressions for the exposure distance of transmission line conductors to direct lightning strikes in terms of striking distances, conductor heights, cross-arm lengths and shielding angles. The expressions are applicable to different electrogeometric models (EGM). They provide the basis on which optimal shielding angle is determined in the design of earthwires. Constrained minimisation of the exposure distance gives the optimal value for shielding angle. The expressions are validated using the published field results. Using the general expressions developed, investigations are carried out to identify the factors on which optimal shielding angle depends and to quantify the degree of dependencies. Sensitivity of the optimal shielding angle to different EGMs is evaluated in the paper.
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