基于EGM的引雷塔对邻近110kV线路的屏蔽保护效应

雷击是威胁电力系统安全运行的重要因素,引雷塔作为一种新型防雷措施在广东地区已开始试点应用。为研究引雷塔对邻近110kV线路的雷电屏蔽特性及引雷塔的屏蔽保护范围,以已建设的引雷塔及其相邻110kV双回输电线路为例,建立了电气几何模型,计算间隔距离、引雷塔高度、地形等因素影响下引雷塔对邻近110kV线路的雷电屏蔽效应,并总结得到其屏蔽保护范围。计算结果发现,引雷塔对相邻110kV线路存在绕击和反击屏蔽效应,两者距离越近,其雷电屏蔽效应越显著;当引雷塔高为60 m时,其在平地和山地情况下,对相邻110kV线路的临界保护距离分别达到623、3674 m。研究结果可为引雷塔选址及推广应用工作提供指导。

Study on Lightning Shielding Characteristic of Lightning Tower for Adjacent 110 kV Transmission Line Based on EGM

Lightning strike is an important factor threatening the safe operation of power systems. As a new type of lightning protection measure, lightning tower has been applied in Guangdong Province. In order to study the lightning shielding characteristics and the protection range of the lightning tower for adjacent 110 kV lines, this paper calculates the lightning shielding effect on adjacent 110 kV lines from the lightning tower at different intervals, different height of the lightning tower and different terrain, and summarizes the shielding protection range of the lightning tower for the adjacent 110 kV double-circuit transmission lines. It is found that there is shielding effect of lightning tower on adjacent 110 kV transmission lines, and the closer the distance between them, the more significant the shielding effect is. When the height of the lightning tower is 60 m, the shielding protection range of the lightning tower for the adjacent 110 kV transmission lines reaches 623 m and 3 674 m in the flat and mountainous areas, respectively. The calculation results can provide guidance for the location of the lightning tower and the lightning protection transformation of nearby lines.