耦合地线在10kV架空线路中的应用研究  

Research on Application of Coupled Ground Wire in 10kV Overhead Line

作　　者：杨鑫[1] 王延夫 唐国栋 祝欢欢 胡嘉宴 仇炜 YANG Xin;WANG Yanfu;TANG Guodong;ZHU Huanhuan;HU Jiayan;QIU Wei(College of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China;Zhuhai Power Supply Bureau of Guangdong Power Co.,Ltd.,Guangdong Zhuhai 519000,China)

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410114 [2]珠海供电局有限公司,广东珠海519000

出　　处：《高压电器》2022年第12期92-101,108,共11页High Voltage Apparatus

基　　金：国家自然科学基金青年基金项目(51407013);广东电网有限责任公司科技项目资助(GDKJXM20161905)。

摘　　要：10 kV架空线路雷击跳闸率高,适用的防雷措施少。相比于架空地线,加装耦合地线的方法具有更好的适用性。文中分析了耦合地线在10 kV架空线路中的防雷机理、安装方式和适用性,认为在现有杆塔和线型条件下应仅加装1根耦合地线。利用ATP-EMTP分别搭建了单回三角形排列和双回直线排列方式的模型,分析了在直击雷和感应雷的作用下,耦合地线对10 kV架空裸导线和绝缘导线耐雷水平的影响。结果表明,对于裸导线,安装耦合地线后的反击耐雷水平和感应雷耐雷水平可提高36.2%~86.3%,雷击导线的耐雷水平可提高4%~13.6%。对于绝缘导线,反击耐雷水平和感应雷耐雷水平可提高44.7%~112.7%,雷击导线的耐雷水平可提高7%~13.6%。还发现杆塔接地电阻越高,感应雷和雷击横担时耦合地线对线路耐雷水平的提升效果越明显。安装耦合地线具有适应性好、效果明显和免维护的特点,是10 kV架空线路可供使用的重要防雷措施。10 kV overhead lines have a high lightning strike and trip rate as well as less applicable lightning protection measures. Compared with ground wires,the method of installing coupled ground wires has better applicability.In this paper,the lightning protection mechanism,installation method and applicability of the coupled ground wire in the 10 kV overhead line are analyzed,thinking that only one piece of coupled ground wire shall be installed under the existing tower and line conditions. The ATP-EMTP is adopted to set up the models of single-circuit triangular configuration and double-circuit linear configuration respectively,and the influence of coupled ground wire on the lightning resistance level of 10 kV overhead bare and insulated wires under the action of direct lightning and induced lightning is analyzed. The results show that for bare wires,the lightning resistance level of counter-strike and of induced lightning after installing the coupling ground wire can be increased by 36.2%~86.3%,and the lightning resistance level of the lightning-struck wire can be improved by 4%~13.6%. While,for insulation wires,the lightning resistance level of counter-strike and of induced lightning can be improved by 44.7%~112.7%,and the lightning resistance level of the wire can be improved by 7%~13.6%. In addition,it is also found that the higher the grounding resistance of the tower is,the more obvious the improvement effect of coupling ground wire on the lightning resistance level of the line is during induced lightning and lightning strike crossarm. Installation of coupled ground wire has such characteristics as good adaptability,obvious effect and maintenance-free. It is an important lightning protection measure for 10 kV overhead lines.

关 键 词：差异化防雷 耦合地线 绝缘导线 10KV架空线路 配电网 耐雷水平 

分 类 号：TM863[电气工程—高电压与绝缘技术]