基于雷电放电选择性的配电线路差异化防雷措施研究

Differentiated Lightning Protection Measures for Distribution Lines Based on Lightning Discharge Selectivity

文中研究了雷电放电选择性对配电线路的影响,包括配电线路走向、配电线路所处地形、地质的关系,为重点防雷区域的辨识提供理论依据。对近年连续发生雷害事故的配电线路进行了数据统计,分析了其所具有的共同特征,并建立了雷云模型与配电线路模型进行理论论证。针对频繁遭受雷击事故的配电线路提出差异化防雷改进建议。包括提高防雷重点配电线路的绝缘水平;为线路加装防雷保护间隙并设计合理的招弧距离;对易发生雷电区域的配电线路进行入侵波重点防护等。有别于雷害事故频繁发生后再对配电线路进行防雷改进措施,该研究是在雷害事故发生前,区分易受雷害事故影响的配电线路,从而形成配电线路预防性防雷保护。

The author studies the influence of lightning discharge selectivity on distribution lines,including the direction of distribution lines,the relationship between topography and geology where distribution lines are located,providing a theoretical basis for the identification of key lightning protection areas.Data statistics were conducted on distribution lines that have experienced consecutive lightning accidents in recent years,and their common characteristics are analyzed.And thundercloud model and distribution line model for theoretical demonstration are established.Dfferentiated lightning protection improvement suggestions are put forward for distribution lines that suffer from frequent lightning strikes,including improving the insulation level of key lightning protection distribution lines;adding lightning protection gaps to the lines and designing a reasonable arcing distance;key protection against intrusion waves for distribution lines in areas prone to lightning.Different from lightning protection improvement measures for distribution lines after frequent lightning accidents,this research is to distinguish the distribution lines that are easily affected by lightning strikes before the occurrence of lightning accidents,so as to form preventive lightning protection for distribution lines.