摘要
接地体与土壤的接触电阻是接地网电阻的重要组成部分,但目前接地网设计中通常认为接地体和土壤是理想接触的,土壤颗粒度大时可能给地网设计带来较大误差。论文提出了一种研究接地体和土壤接触电阻的测试评估方法,建立了接地体与土壤接触电阻的测试平台,结合仿真计算对比了石墨基柔性接地材料和圆钢在不同土壤类型条件下的接触特性,并提出在仿真设计中通过等效涂层的方式模拟接触电阻。研究表明:该方法能有效评估接地体和土壤的接触电阻,石墨基柔性接地材料的接触性能在典型山石地区的土壤条件下明显优于圆钢,石墨基柔性接地材料与土壤的接触电阻占工频接地电阻的1.83%~1.95%,而圆钢占比为6.79%~7.57%。
The contact resistance between grounding materials and soil is an important part of grounding resistance of grounding grids.However,at present,the design of grounding grids usually assumes that the grounding materials and soil are in ideal contact,which may bring a large error to the design value of grounding resistance.In this paper,a method for measuring and assessing the contact resistance between grounding materials and soil was proposed.A test platform for the contact resistance between grounding materials and soil was established.Then,combined with the finite element simulation,the contact characteristics of graphite based flexible grounding material and round steel with several soil types were compared.Finally,it was proposed to simulate the contact resistance through an equivalent coating in the simulation design of grounding grids.The research results show that the method of this paper can be adopted to effectively assess the contact resistance between the grounding materials and the soil,and the contact characteristics between graphite based flexible grounding material and typical mountainous soil is significantly better than that of round steel.The contact resistance between graphite based flexible grounding material and soil accounts for 1.83%~1.95%of the power frequency grounding resistance,while the contact resistance between round steel and soil accounts for 6.79%~7.57%.
作者
张迅
曾鹏
黄道春
曾华荣
田承越
全万霖
ZHANG Xun;ZENG Peng;HUANG Daochun;ZENG Huarong;TIAN Chengyue;QUAN Wanlin(Electric Power Research Institute of Guizhou Power Grid Co.,Ltd.,Guiyang 550002,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2021年第2期687-694,共8页
High Voltage Engineering
基金
贵州电网有限责任公司科技项目(GZKJXM20160048)
湖北省自然科学基金创新群体项目(2016CFA007)。
关键词
接触电阻
石墨基柔性接地材料
圆钢
土壤类型
等效涂层电阻率
contact resistance
graphite based flexible grounding material
round steel
soil type
equivalent coating resistivity
作者简介
张迅,1981一,男,硕士,高工,从事高电压技术、防冰技术等方面的研究工作,E-mail:xunzhx@sina.com;曾鹏,1988-,男,硕士,工程师,主要从事电力设备绝缘技术、电力机器人等方面的研究工作,E-mail:191089074@qq.com;通信作者:黄道春,1976-,男,博士,研究员,博导,主要研究方向为输变电设备外绝缘、高压电器、电磁场数值计算及其工程应用。湖北省自然科学基金创新群体研究骨干,主持国家自然科学基金面上项目1项,国家重点研发计划子课题1项,教育部博士点基金1项,主持企业横向科研项目20余项,曾获湖北省科技进步一等奖1项,三等奖1项,E-mail:huangdc99@163.com。
