发电机绕组端部斜边电场的影响因素研究  

Research on Influencing Factors of Hypotenuse Electric Field at End of Generator Winding

作　　者：孙永鑫 冯超[1,2,3] 祝晚华 SUN Yongxin;FENG Chao;ZHU Wanhua(National Engineering Research Center Hydropower Equipment,Harbin 150040,China;State Key Laboratory of Hydropower Equipment,Harbin 150040,China;Harbin Institute of Large Electrical Machinery,Harbin 150040,China;Key Laboratory of Engineering Dielectric and Its Application,Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China;Guilin Electrical Equipment Scientific Research Institute Co.,Ltd.,Guilin 541004,China)

机构地区：[1]哈动国家水力发电设备工程技术研究中心有限公司,黑龙江哈尔滨150040 [2]水力发电设备国家重点实验室,黑龙江哈尔滨150040 [3]哈尔滨大电机研究所,黑龙江哈尔滨150040 [4]哈尔滨理工大学工程电介质及其应用教育部重点实验室,黑龙江哈尔滨150080 [5]桂林电器科学研究院有限公司,广西桂林541004

出　　处：《绝缘材料》2021年第1期50-54,共5页Insulating Materials

基　　金：国家重点研发计划项目(2017YFB0903700)。

摘　　要：发电机在电气试验和运行中,定子绕组端部斜边电场很高,是易发生电晕放电的薄弱部位。本研究建立了定子绕组端部斜边电场的解析模型和有限元模型,研究了斜边电场的影响因素和规律,分析了斜边间隙、转角和填充介质介电常数变化对最大电场的影响,提出了改善端部电场的有效方法。结果表明:同相绕组下降低定子线棒的表面电场、减小线棒宽度、增大斜边间隙、减小线棒转角,异相绕组下增大气体填充介质的介电常数和绕组斜边间隙,均能有效改善斜边电场。绕组斜边电场有限元模型能够准确地分析绕组端部最大电场及分布趋势。通过紫外成像设备的电晕试验,验证了该模型的正确性,表明该模型具有良好的工程应用价值。In the electrical test and operation of generator,the hypotenuse electric field at the end of stator winding is very high,which is a weak part that corona discharge often occurs.In this study,an analytical model and a finite element model of the hypotenuse electric field at the end of stator winding were established.The influencing factors and laws of the hypotenuse electric field were studied,and the influence of the hypotenuse clearance,rotating angle,and dielectric constant of the filling medium on the maximum electric field was analyzed.An effective method to optimize the electric field at the end was presented.The results show that under the in-phase winding,the hypotenuse electric field can be optimized by decreasing the surface electric field of stator bar,the width of bar,and the rotating angle of bar or increasing the hypotenuse clearance;Under the out-of-phase winding,the hypotenuse electric field can be optimized by increasing the dielectric constant of filling medium and the hypotenuse clearance of winding.The finite element model of hypotenuse electric field can accurately analyze the maximum electric field and the distribution trend at the end of winding.The correctness of the model is verified by corona test of UV imaging equipment,which indicate that that the model has good engineering application value.

关 键 词：发电机绕组 斜边电场 防晕计算 有限元模型 

分 类 号：TM201.3[一般工业技术—材料科学与工程]