杆塔接地体冲击电位分布特性的模拟试验  

Simulation Experiment on Potential Distribution for Grounding Electrode of Transmission Tower Under Impulse Current

作　　者：韩学民[1,2] 夏长征[1] 喻剑辉[1] 徐斌[2] 蒲兵舰[1] 周文俊[1] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]安徽省电力公司,合肥230022

出　　处：《高电压技术》2011年第10期2464-2470,共7页High Voltage Engineering

基　　金：中国-苏格兰博士生教育及科研基金(留金欧[2010]6044)~~

摘　　要：为研究雷击杆塔时经接地体泄散的雷电流在杆塔周围地面产生的电位分布及其影响,采用模拟试验的方法,在半球形接地池中对不同幅值冲击电流作用条件下几种典型形状杆塔接地极周围的地面电位分布特性进行了试验研究,测得了相应的等电位分布曲线。将所得电位分布曲线按模拟比进行换算后,估算出接地极附近地面可能作用于人体的暂态跨步电压。通过对比现有雷电流幅值概率分布的研究结果得到:雷击杆塔时有较大概率在杆塔周围地面形成可能危及人身安全的暂态跨步电势。该结论对杆塔接地体的结构设计、改进及人口密集的城市地段的杆塔安全防范措施的制定具有指导意义。We researched the potential distribution of grounding electrode under impulse current and its influence by simulation. The test area was in a hemispherical grounding pool, the impulse current of different amplitudes was ap plied to the grounding electrodes of some representative structures, and the potential distribution curves around the grounding electrodes were measured to understand the characteristics of potential distribution. Converting the potential distribution curve by simulation scaling factors, the transient step voltage near the grounding electrodes could be estimated. According to the existing probability distribution of lightning current amplitude, the conclusion can be drawn that there is a larger probability to form a dangerous transient step potential on the surroundings ground of tower stroke by lightning, which is useful for the design and improvement of grounding electrodes and for formula ting security protection measures of grounding electrodes in the urban areas.

关 键 词：杆塔接地体 模拟试验 冲击电流 冲击电位分布 电位换算 暂态跨步电势 

分 类 号：TM862[电气工程—高电压与绝缘技术]