线路杆塔的放射形接地体防雷特性优化与设计  

Optimization and Design of Protection Characteristics for Radial Grounding Conductors of Line Towers

作　　者：漆思怡 赵洪峰[1] QI Siyi;ZHAO Hongfeng(College of Electrical Engineering,Xinjiang University,Urumqi 830017,Xinjiang,China)

机构地区：[1]新疆大学电气工程学院,新疆乌鲁木齐830017

出　　处：《电网与清洁能源》2022年第1期1-6,共6页Power System and Clean Energy

基　　金：国家自然科学基金(51762038)。

摘　　要：减小雷击对输电设施造成的损害,降低接地体的冲击接地电阻是现今接地设计的重中之重,其中选择不同的接地体分布形状对杆塔的防雷特性有巨大影响。该文利用CDEGS对于两种放射形接地体进行仿真,对比研究两者的冲击特性,发现低土壤电阻率区域更宜使用标准放射形接地体;高土壤电阻率区域更宜装设人字形接地体。对于两种放射形接地体,进一步施加"树枝状"短导体,分析对比其补充"树枝状"短导体的降阻效果,发现放射形接地体补充"树枝状"短导体效果更好。使用ATP-EMTP考虑火花效应的影响进行仿真后发现,使用导体材料长度相同的情况下,单接地极上施加两个树枝状短导体效果最好。在进行杆塔接地设计时,该研究结果能够为线路杆塔选择接地体提供理论支持和实测结果。Reducing the damage caused by lightning to transmission facilities and reducing the impact grounding resistance of grounding conductors are of top priority to the grounding design.The selection of different grounding conductor distribution shapes has a great influence on the lightning protection characteristics of towers. This paper simulates two kinds of radial earthing through CDEGS,and compares their impact characteristics. It is found that the standard radial earthing is more suitable for low soil resistivity area,while it is better to install herringbone earthing conductor in areas with high soil resistivity. It further applies "dendritic" short conductor to two kinds of radial grounding conductors,analyzes and compares the resistance reduction effect of the supplementing "dendritic" short conductor,which is found to have better effects with the radial earthing. After the simulation with ATP-EMTP considering the influence of spark effect,it is found that when the conductor material length is the same,the effect of applying two dendritic short conductors on a single grounding conductor is the best. The research results can provide theoretical support and analytical thinking for the selection when designing tower grounding for line towers.

关 键 词：CDEGS 放射形接地体 冲击接地电阻 ATP-EMTP 

分 类 号：TM862[电气工程—高电压与绝缘技术]