大型水轮发电机绝缘参数对定子线棒端部电场和 电位分布的影响  

Influence of Insulation Parameters on Electric Field and Potential Distribution at Stator Bar End of Large Hydro-generator

作　　者：李寅伟 李强 李岩 汪江昆 胡建林[3] 谭恢林 LI Yinwei;LI Qiang;LI Yan;WANG Jiangkun;HU Jianlin;TAN Huilin(POWERCHINA Chengdu Engineering Corporation Limited,Chengdu 610072,China;Yalong River Hydropower Development Corporation Limited,Chengdu 610051,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China)

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,四川成都610072 [2]雅砻江流域水电开发有限公司,四川成都610051 [3]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《绝缘材料》2022年第1期73-79,共7页Insulating Materials

摘　　要：应用COMSOL软件建立了定子线棒端部的有限元仿真模型,分析了绝缘材料电性能参数对线棒端部表面电场及电位分布的影响。结果表明:随着主绝缘相对介电常数的增大,线棒端部表面最大电场增大,主绝缘材料的相对介电常数选择偏小为佳;主绝缘材料电阻率对线棒端部表面最大电场的影响不显著。各级防晕层的相对介电常数对线棒表面最大电场变化影响很小。中阻防晕层非线性电阻系数取较大值时为佳;中高阻防晕层非线性电阻系数对线棒表面最大电场影响很小,但取值为1时最佳;高阻防晕层非线性电阻系数对线棒表面最大电场基本没有影响。不同防晕层初始电阻率对线棒表面最大电场的影响程度不同,通过偏相关分析,得到绝缘材料电性能参数对端部电场最大值的影响程度排序,其中中阻防晕层的初始电阻率和非线性电阻系数为主导因素。A finite element simulating model of stator bar end was established by COMSOL software,and the influences of electrical properties parameters of insulating material on the electric field and potential distribution of bar end were analyzed.The results show that with the increase of relative permittivity of main insulation,the maximum electric field on stator bar end surface increases,therefore it is better to choose smaller relative permittivity of main insulating material.The resistivity of main insulation material has no significant effect on the maximum electric field on bar end surface.The relative permittivity of each anti corona layer has little effect on the maximum electric field on bar surface.It is better to choose larger nonlinear resistance coefficient of medium resistance anti corona layer.The nonlinear resistance coefficients of medium and high resistance anti corona layer have little effect on the maximum electric field on bar surface,and it is best to choose 1.The nonlinear resistance coefficient of high resistance anti corona layer has no effect on the maximum electric field on bar surface.The influence degree of initial resistivity of different anti corona layers on the maximum electric field of bar surface is different.Through partial correlation analysis,the influence degree of electrical properties parameters of insulating material on the maximum electric field at bar end is ranked,and the initial resistivity and nonlinear resistance coefficient of the medium resistance anti corona layer are the dominant factors.

关 键 词：定子线棒端部 有限元分析 绝缘参数 电场强度 电位分布 

分 类 号：TM853[电气工程—高电压与绝缘技术]