电流加热伏安法测量石墨基柔性接地体的电阻-温度特性  

Measurement of resistance temperature characteristics of graphite based flexible grounding body with current heating voltammetry

作　　者：胡松江 陈四甫 刘礼琴 李付磊 丁卫东[2] 王洋 曹雯[3] HU Songjiang;CHEN Sifu;LIU Liqin;LI Fulei;DING Weidong;WANG Yang;CAO Wen(Henan Star Electric Power Equipment Co.Ltd.,Xuchang 461500,Henan,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;School of Electronics and Information,Xi’an Polytechnic University,Xi’an 710048,China)

机构地区：[1]河南四达电力设备股份有限公司,河南许昌461500 [2]西安交通大学电气工程学院,陕西西安710049 [3]西安工程大学电子信息学院,陕西西安710048

出　　处：《西安工程大学学报》2022年第4期127-134,共8页Journal of Xi’an Polytechnic University

基　　金：陕西省自然科学基础研究计划项目(2021JM-450)。

摘　　要：研究石墨基柔性材料电阻温度特性和热稳定性。采用电流加热与恒温保护配合的方法,利用伏安法分别测量各温度下接地体的电阻,推导出平均电阻温度系数;运用实验得到的接地体电阻温度特性参数,迭代计算出石墨基柔性接地体在工频接地故障电流和雷电冲击电流下的最大温升,结合热稳定系数的计算给予验证。实验结果表明:石墨基柔性接地体具有负的温度系数。在石墨基柔性接地体的最高允许使用温度为450℃时,0.5 s工频电流下的最大允许的电流约为1.4 kA;在8/20μs高频雷电流冲击下,石墨基柔性接地体的最高允许通过电流为287.9 kA。The resistance temperature characteristics and thermal stability of graphite based flexible grounding materials were studied.With the method of current heating and constant temperature protection,the resistance of grounding body at each temperature was measured by voltammetry,and the average resistance temperature coefficient was derived.With the resistance temperature characteristic parameters of the grounding body obtained from the experiment,the maximum temperature rise of the graphite based flexible grounding body under the power frequency grounding fault current and lightning impulse current was calculated iteratively,which is verified by the calculation of the thermal stability coefficient.The experimental results show that the graphite based flexible grounding body has a negative temperature coefficient.When the maximum allowable service temperature of the graphite based flexible grounding body is 450℃,the maximum allowable current under 0.5 s power frequency current is about 1.4 kA,which is 8/20μs the maximum allowable passing current amplitude of graphite based flexible grounding body under the impact of high frequency lightning current is 287.9 kA.

关 键 词：石墨基柔性接地体 电阻温度特性 电流加热伏安法 电阻-温度曲线 热稳定校验 

分 类 号：TM862[电气工程—高电压与绝缘技术]