温度对高压电机用防晕材料非线性电阻特性的影响  

Influence of Temperature on Nonlinear Resistance Characteristics of Stress Grading Materials for High Voltage Rotating Machine

作　　者：张跃 刘枰 刘学忠[2] 胡波 梁智明 ZHANG Yue;LIU Ping;LIU Xuezhong;HU Bo;LIANG Zhiming(Dongfang Electric Machinery Co.,Ltd.,Deyang 618000,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]东方电气集团东方电机有限公司,四川德阳618000 [2]西安交通大学电力设备与电气绝缘国家重点实验室,陕西西安710049

出　　处：《绝缘材料》2021年第9期86-91,共6页Insulating Materials

摘　　要：为研究温度对不同防晕材料非线性电阻特性的影响规律,提出并应用预置低阻带作为电极的测量方法,测试4种防晕材料在不同温度下的非线性伏安特性,同时采用函数拟合方法研究了温度对不同防晕材料非线性电阻特性的影响程度,进一步通过仿真研究对比额定相电压和耐压试验电压下及不同温度下的24 kV水轮发电机定子绕组端部防晕结构沿面电场的分布差异。结果表明:4种防晕材料的非线性伏安特性与表面电阻率均表现出明显的温度依赖性,初始表面电阻率和非线性系数均随温度的升高呈减小的趋势;不同温度下24 kV水轮发电机防晕结构的沿面电场分布差异较小。In order to study the influence of temperature on the nonlinear resistance characteristics of different stress grading materials,a measurement method using the presetting low resistivity tape as the electrode was proposed and applied.The nonlinear volt-ampere characteristics of four stress grading materials under different temperatures were tested.At the same time,the influencing degree of temperature on the nonlinear resistance characteristics of different stress grading materials were studied by function fitting method.The distribution differences of surface electric field along the stress grading structure at stator winding end of 24 kV hydro generator under the withstand voltage test voltage and the rated phase voltage at different temperatures were further simulated and compared.The results show that the nonlinear volt-ampere characteristics and surface resistivity of four stress grading materials show obvious temperature dependence,with the increase of temperature,both the initial surface resistivity and nonlinear coefficient decrease,there is little difference among the surface electric field distributions along the stress grading structure of 24 kV hydro-generator under different temperatures.

关 键 词：高压电机 防晕 非线性 温度 

分 类 号：TM851[电气工程—高电压与绝缘技术]