35 kV配电线路直击雷防护计算

Simulation on direct lightning strike protection of 35 kV power distribution line

山区配电线路运行时存在雷电直击现象,而目前35 kV配电线路的直击雷过电压研究相对较少。本文采用仿真计算的方法,研究35 kV配电线路耐雷水平变化规律并优化避雷器布置方式。仿真计算结果表明:线路无避雷器时耐雷水平低,装设避雷器可明显提升线路耐雷水平;采用每2至3基杆塔安装1组避雷器的安装方式,只有当雷击发生在安装了避雷器的杆塔附近的导线上时,才能显著提高线路耐雷水平;在易遭雷击的档距的两个杆塔上装设避雷器,线路耐雷水平能明显提升,且当雷击档距中央时耐雷水平最高。研究结论为35 kV配电线路直击雷过电压的防护及差异化防雷提供理论参考。

There′s direct lightning strike to distributing line in mountain area.But only a few researches were conducted on direct lightning stroke over voltage of 35kV distributing line.Simulation method is used to study lightning withstand level of 35kV distributing line.Arrester arrangement form is optimized.The simulation results indicated that lightning withstand level is small without the arresters and it increased obviously with them.If one group of arresters is installed for every 2 or 3 towers,lightning withstand level increased obviously when lightning strike occurred on the line near the tower with the arrester.Lightning withstand level increased obviously if the arresters are installed on two towers of span vulnerable to lightning strikes.The lightning withstand level is maximum when lightning strikes on the middle span.This paper provides a theoretical reference for the protection and differential protection of lightning overvoltage of 35kV power distribution lines.