摘要
采用模拟试验的方法得到了水平射线的电流分布,包括不同电阻率土壤中的纵向传导电流及相应各段接地导体的横向流散电流,结果显示杆塔接地体水平射线上的横向流散电流呈现出"两端大、中部小"的分布特点,具有明显的端部效应。基于这一分布规律,提出分支呈120°的三段式结构的水平射线改型方案,模拟试验证实这一结构改型最大可使方框接地体的冲击接地电阻降低22%,降阻效果显著。
To research reducing resistance measures of tower grounding electrodes, current distribution on horizontal ray conductors are achieved by small-scale tests in this paper including longitudinal conduction current and transverse diffusing current of every section conductors in different resistivity soil. The testing results show that the distribution of transverse diffusing current presents distribution features of ＂Large current of two ends artd small current of middle＂ and notable end effect. Based on the distribution law, thel20~ three branches structure modification program is put forward according to horizontal ray conductors. Test results show that the impulse grounding resistance of square grounding electrode reduces by 22% after adopting this program, and pronounced reducing resistance effect is acquired. The research results could offer guidance for optimum design of tower grounding electrodes in high resistivity area.
出处
《电瓷避雷器》
CAS
北大核心
2015年第5期128-133,共6页
Insulators and Surge Arresters
关键词
冲击电流
杆塔接地体
冲击特性
电流分布
降阻措施
优化设计
impulse current
tower grounding reducing resistance measures
optimum design electrodes
impulse characteristics
current distribution
