石墨接地体添加火花刺的冲击降阻特性研究  

Impulse Resistance Reduction Characteristics of Graphite Grounding Device with Spark Spikes

作　　者：赵德辉 张国锋 朱毅男 丁卫东[4] 务孔永 路渊博 ZHAO Dehui;ZHANG Guofeng;ZHU Yinan;DING Weidong;WU Kongyong;LU Yuanbo(Construction branch of State Grid Inner Mongolia Eastern Power Co.,Ltd.,Hohhot 010020,China;Henan STAR Electric Power Equipment Co.,Ltd.,Xuchang,461500;Shijiazhuang Power Supply Branch,State Grid Hebei Electric Power Corporation,Shijiazhuang 050000,China;Xi'an Jiaotong University,Xi'an,710049,China)

机构地区：[1]国网内蒙古东部电力有限公司建设分公司,呼和浩特010020 [2]河南四达电力设备股份有限公司,河南许昌461500 [3]国网河北省电力有限公司石家庄供电分公司,石家庄050000 [4]西安交通大学,西安710049

出　　处：《电瓷避雷器》2023年第4期120-128,共9页Insulators and Surge Arresters

摘　　要：石墨接地体添加火花刺可以有效降低冲击接地电阻,为研究方框带外延线型石墨接地装置添加火花刺的降阻规律,从电磁场角度出发,建立了考虑电感效应、集肤效应和火花效应有限元分析模型,系统分析了火花刺的长度、位置和间距对方框带外延线石墨接地体冲击接地电阻的影响,并设计试验进行了验证。结果表明:方框带外延线型石墨接地装置射线端添加火花刺可以增加散流通道进而有效降低冲击接地阻抗。该试验条件下,受端部效应的影响,火花刺应布置在射线长度的1/3-7/10处;受屏蔽效应的影响,火花刺长度的最优值约为射线长度的0.1-0.25倍,火花刺间隔的最优值为火花刺长度的0.9-1.1倍。Adding spark spikes to graphite grounding body can effectively reduce impulse grounding resistance.In order to study the resistance reduction law of square strip epitaxial graphite grounding device with spark spikes,a finite element analysis model considering inductance effect,skin effect and spark effect are established from the perspective of electromagnetic field.The influence of location and spacing on the impulse grounding resistance of graphite grounding body with square strip epitaxial line is analyzed and verified by design tests.The results show that adding spark spikes at the ray end of the square strip epitaxial graphite grounding device can increase the dispersion channel and effectively reduce the impulse grounding impedance.Under the experimental conditions,the spark spikes should be arranged at 1/3-7/10 of the ray length due to the end effect;Affected by the shielding effect,the optimal length of the spark spike is about 0.1-0.25 times of the ray length,and the optimal interval of the spark spike is 0.9-1.1 times of the spark spike length.

关 键 词：集肤效应 屏蔽效应 火花刺 冲击接地电阻 石墨接地 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM75