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首页> 外文期刊>Electric power systems research >The use of shield wires for reducing induced voltages from lightning electromagnetic fields
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The use of shield wires for reducing induced voltages from lightning electromagnetic fields

机译：使用屏蔽线降低雷电电磁场的感应电压

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摘要

The mechanisms from which lightning overvoltages can be produced on a power line depend on the system voltage. In medium voltage (MV) overhead distribution systems, lightning transients can be originated from either direct or indirect strokes. The main methods that can be adopted to improve the line lightning performance concern the increase of the critical impulse flashover voltage (CFO) of the line structures, the installation of surge arresters, and the use of one or more shield wires. This paper deals with the evaluation of the effectiveness of shield wires in reducing the magnitudes of the surges induced by nearby strokes on MV distribution lines. Such effectiveness depends on the combination of several parameters such as the relative position of the shield wire with respect to the phase conductors, the grounding interval, the ground resistance, the stroke current steepness, and the relative position of the stroke channel with respect to the grounding points. Realistic situations corresponding to typical configurations of a rural distribution line with either an overhead ground wire or a neutral conductor are considered. The analysis is carried out based on both computer simulations and test results obtained from scale model experiments, under controlled conditions.
机译：在电源线上产生雷击过电压的机制取决于系统电压。在中压（MV）架空配电系统中，雷电瞬变可能源自直接或间接行程。可以采用的改善线路雷电性能的主要方法涉及增加线路结构的临界脉冲闪络电压（CFO），安装避雷器以及使用一根或多根屏蔽线。本文旨在评估屏蔽线在降低MV配电线上附近笔触引起的电涌幅度方面的有效性。这种有效性取决于几个参数的组合，例如屏蔽线相对于相导体的相对位置，接地间隔，接地电阻，冲程电流陡度以及冲程通道相对于接地导体的相对位置。接地点。考虑了与架空接地线或中性导体的农村配电线路的典型配置相对应的实际情况。分析是在受控条件下基于计算机模拟和从比例模型实验获得的测试结果进行的。

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