柔性石墨复合接地体电感效应与火花放电效应研究  

Study on Inductance Effect and Spark Discharge Effect of Flexible Graphite Composite Grounding Conductors

作　　者：冯建源 安韵竹[1] 姜志鹏 胡元潮[1] 高晓晶 周蠡 FENG Jianyuan;AN Yunzhu;JIANG Zhipeng;HU Yuanchao;GAO Xiaojing;ZHOU Li(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China;State Grid Hubei Power Supply Limited Company Ezhou Power Supply Company,Ezhou 436000,China;State Grid Hubei Power Supply Limited Company,Economic&Technology Research Institute,Wuhan 430000,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255000 [2]国网湖北省电力有限公司鄂州供电公司,湖北鄂州436000 [3]国网湖北省电力有限公司经济技术研究院,武汉430000

出　　处：《电瓷避雷器》2021年第3期112-118,共7页Insulators and Surge Arresters

基　　金：国家自然科学基金(编号:51807113);山东省自然科学基金(编号:ZR2016EEQ20)。

摘　　要：柔性石墨复合接地体是一种具有良好的导电性、耐腐蚀性且非铁磁性的非金属接地体。为研究电感效应与火花放电效应对石墨复合接地体冲击特性的影响规律,笔者搭建了频域电网络模型及其迭代算法对接地体的冲击接地特性进行仿真计算,通过与CDEGS仿真结果及文献的试验结果进行对比,验证了仿真计算方法的有效性及准确性。在此基础上,对不同土壤和雷电流参数下石墨复合接地体的冲击特性进行仿真计算。研究结果表明:高土壤电阻率作用下,石墨复合接地体的冲击系数较小,火花放电效应较强,相反的,当土壤电阻率较低时,电感效应较强。火花放电效应强度在高幅值雷电流作用下增强,且与土壤临界击穿场强有关,而电感效应受两者的影响不大。雷电流波前时间越短,接地体的长度越长,电感效应的影响就越强,尤其是在低土壤电阻率条件下影响更为显著。本研究仿真结论可为杆塔接地施工与材料选型提供参考。The flexible graphite composite grounding conductors is a non-metallic grounding conductors with good electrical conductivity,corrosion resistance and non-ferromagnetic properties. In order to study the influence of inductance effect and spark discharge effect on the impact characteristics of graphite composite grounding conductors,this paper builds a frequency domain electrical network model and its iterative algorithm to simulate the grounding characteristics of grounding conductors. By comparing with the CDEGS simulation results and the experimental results of the literature,the validity and accuracy of the simulation calculation method are verified. On this basis,the impact characteristics of graphite composite grounding conductors under different soil and lightning current parameters are simulated. The results show that: under the action of high soil resistivity,the impact coefficient of the grounding conductors is small,and the spark discharge effect is strong. On the contrary,when the soil resistivity is low,the inductance effect is strong. The spark discharge effect intensity is enhanced by the high amplitude lightning current and is related to the critical breakdown field strength of the soil,and the inductance effect is not affected by the two factors. The shorter the lightning current wavefront time,the longer the length of the grounding conductors,the stronger the influence of the inductance effect,especially under the condition of low soil resistivity. The simulation conclusions in this paper can provide reference for grounding construction and material selection of towers.

关 键 词：冲击特性 电感效应 火花放电效应 石墨复合接地体 频域电网络模型 

分 类 号：TQ127.11[化学工程—无机化工] TM862[电气工程—高电压与绝缘技术]