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首页> 外文会议>2011 7th Asia-Pacific International Conference on Lightning >The Effectiveness of Shield Wires in Reducing Induced Voltages from Lightning Electromagnetic Fields
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The Effectiveness of Shield Wires in Reducing Induced Voltages from Lightning Electromagnetic Fields

机译：屏蔽线在减小雷电电磁感应电压中的有效性

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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 by either direct or indirect strokes. The main methods that can be adopted to improve the line lightning performance concern the increase of the critical flashover voltage (CFO) of the line structures, the installation of surge arresters, and the use of one or more periodically grounded 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 performed under controlled conditions.
机译：在电源线上产生雷电过电压的机制取决于系统电压。在中压（MV）架空配电系统中，雷电瞬变可以由直接或间接的行程引起。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闪络电压（CFO），安装电涌放电器以及使用一根或多根定期接地的屏蔽线。本文旨在评估屏蔽线在降低MV配电线上附近的行程引起的电涌幅度方面的有效性评估，其有效性取决于多个参数的组合，例如屏蔽线相对于电缆的相对位置。相导体，接地间隔，接地电阻，行程电流陡度以及行程通道相对于接地点的相对位置。实际情况对应于带有架空接地线或接地导线的农村配电线路的典型配置考虑中性导体。分析是基于计算机模拟和从在受控条件下进行的比例模型实验获得的测试结果进行的。

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