改善冲击散流时地中电场分布的接地降阻试验  

Experimental Study on Grounding Resistance Reduction Based on Improved Grounding Electric Field Distribution Induced by the Diffuser of Impulse Current

作　　者：司马文霞[1] 雷超平[1] 袁涛[1] 杨庆[1] 樊尊金 苟智军 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [2]四川达州电业局,达州635000

出　　处：《高电压技术》2011年第9期2294-2301,共8页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724504)~~

摘　　要：已有的冲击接地试验研究表明,冲击电流入地后地中电场分布决定了接地装置的散流性能。从改善冲击散流时地中电场分布的角度进行冲击接地模拟试验研究,可提高接地装置冲击散流效率,降低接地装置冲击接地阻抗,为高土壤电阻率地区的防雷降阻措施提供新的解决思路。因此基于相似准则,对单根水平接地体和星型水平接地体在两种土壤电阻率下的冲击散流规律进行了模拟试验,并根据试验结果利用针刺状导体改善了接地体冲击散流时的地中电场分布。改善后的冲击接地试验结果表明,基于冲击散流时地中电场分布的接地装置改善措施,能够起到较明显降低冲击接地阻抗的效果,且冲击降阻的效果受冲击电流幅值和接地体结构布置的影响。The simulative impulse grounding research aiming at improving the electric field distribution induced by the grounding current can increase the impulse current dispersion efficiency of the grounding devices,reduce the impulse grounding impedance,and provide a new solution for resistance reduction in areas with high soil resistivity.Consequently,based on the similarity principle,the simulation experiment is carried out to analyze the impulse current diffuser regulation of the single and star horizontal electrodes under the condition of two different soil resistivity,thereby,from the tests results,the electric field distribution induced by the grounding current is improved by the implementation of needle-shaped conductors.The impulse grounding experiment demonstrates that the improved grounding solution based on electric field distribution induced by the dispersion of the grounding current has a positive effect on reducing the impulse ground impedance.Furthermore,amplitude of impulse current as well as configuration of grounding device have a significant impact on the effect of impulse impednace reduction.

关 键 词：接地体 冲击模拟试验 电场分布 火花击穿 端部效应 降阻 

分 类 号：TM862[电气工程—高电压与绝缘技术]