摘要
为了研究输电线路杆塔接地装置周边雷电散流特性,建立了典型杆塔接地装置地中散流模型,并搭建模拟雷电流发生装置和地中散流测量系统的现场实验平台,对杆塔接地装置周边地中散流进行测量,结合模拟实验和仿真数据,分析接地装置结构对地中散流特性的影响。结果表明:地中散流测量系统现场实验平台可以准确测量地中散流密度,且模拟实验数据与仿真结果一致;电流密度在距接地极3～5 m处下降约50%,距接地极7～8 m处下降约75%,距接地极10 m处下降约90%;接地装置附近的地中散流密度随水平接地极的延长而减小,且距离接地装置越近变化趋势越明显,在7 m外散流密度不再受水平接地极长度影响。
To study characteristic of lightning dispersed currentsurrounding the tower grounding device of transmission lines, a typical model of ground dispersed current was built and a field experiment platform for simulating lightning current generating device and the ground dispersed current measurement system was established. By measuring ground dispersed low surrounding the tower grounding device and combining simulated experimental data, effect of the structure of the grounding device on characteristic of ground dispersed current was analyzed. The result indicates the field experiment platform for ground dispersed current measurement system can correctly measure ground dispersed current density and the simulated experimental data is in accordance with the result of simulation. In addition, current density has reduced by about 50%, 75% and 90% respectively away from the grounding electrode 3~5 m, 7~8 m and 10 m respectively. Meanwhile, ground dispersed current density surrounding the grounding device decreases with extension of the horizontal grounding electrode, and the variation trend is more evident as it is more closer to the grounding device. Disperse current density is no longer affected by length of the horizontal grounding electrode 7 m away from the grounding electrode.
作者
陈邦发
陈斯翔
詹清华
李恒真
吴江一
CHEN Bangfa;CHEN Sixiang;ZHAN Qinghua;LI Hengzhen;WU Jiangyi(Foshan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Foshan,Guangdong 528000,China)
出处
《广东电力》
2019年第3期119-125,共7页
Guangdong Electric Power
基金
广东电网有限责任公司科技项目(GDKJXM20162390)
关键词
雷击
接地装置
地中散流特性
电流密度
模拟实验
lightning
grounding device
ground dispersed current characteristic
current density
simulated experiment
