考虑气隙偏心时短路因素对发电机端部绕组振动的影响  

Impact of short circuit factors on end winding vibrations in generators considering air-gap eccentricity

作　　者：徐明星 何玉灵[1,2,3] 张文 代德瑞[1,2] 刘翔奥 唐贵基 XU Mingxing;HE Yuling;ZHANG Wen;DAI Derui;LIU Xiang’ao;TANG Guiji(Hebei Engineering Research Center for Advanced Manufacturing&Intelligent Operation and Maintenance of Electric Power Machinery,North China Electric Power University,Baoding 071003,China;Hebei Key Laboratory of Electric Machinery Health Maintenance&Failure Prevention,North China Electric Power University,Baoding 071003,China;Suzhou Research Institute,North China Electric Power University,Suzhou 215123,China)

机构地区：[1]华北电力大学电力机械装备先进制造与智能运维河北省工程研究中心,河北保定071003 [2]华北电力大学电力机械装备健康维护与失效预防重点实验室,河北保定071003 [3]华北电力大学苏州研究院,江苏苏州215123

出　　处：《振动与冲击》2024年第14期112-121,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金(52177042);河北省自然科学基金(E2020502032);中央高校基本业务费专项基金(2023MS128);河北省第三批青年拔尖人才支持计划([2018]-27);河北省研究生创新能力培养资助项目(CXZZBS2023149);河北省高层次人才资助项目(B20231006);苏州市社会发展科技创新项目(SS202134)。

摘　　要：端部绕组振动是导致绝缘磨损和退化的关键因素之一,因此对同步发电机在转子匝间短路下的端部绕组振动特性进行了研究。不同于以往,该研究不仅考虑了转子匝间短路程度,还考虑了转子匝间短路位置和气隙偏心程度对端部绕组振动的影响。首先理论推导得出定子端部绕组的受力表达式;然后基于电磁-结构耦合模型得到了绕组电磁力及其力学响应特性,如变形、应变和应力;最后在CS-5故障模拟发电机进行试验验证。试验结果与理论分析、有限元计算结果基本一致。结果表明,转子匝间短路会给绕组电磁力带来额外的50 Hz(基本频率)、150 Hz和200 Hz的谐波。随着气隙偏心程度/转子匝间短路程度/短路位置与大齿之间距离增大,端部绕组电磁力/振动加剧。此外,复合故障对端部绕组振动影响更为严重。在定子绕组电磁力作用下,定子绕组鼻端部位为最大变形位置,同时绕组直线段与端部的连接处易发生绝缘磨损,在制造及后期维护中应重点关注。End winding vibration is one of the key factors that leads to the insulation wearing and degrading.A comprehensive study was presented on the end winding vibration properties of synchronous generators in rotor interturn short circuit cases.Different from other studies,this work investigates the influences of not only the rotor interturn short circuit degree,but also the rotor interturn short circuit position and the air-gap eccentricity on the end winding vibration.Firstly,the expression of the end winding electromagnetic force was obtained through theoretical derivation.Then,the winding electromagnetic forces and response characteristics,such as deformation,strain and stress,were obtained based on a coupled electromagnetic-structural model.Finally,an experimental verification was carried out on the CS-5 fault simulator generator.The experimental results are basically consistent with those of the theoretical analyses and finite element calculations.It is shown that the rotor interturn short circuit will bring extra 50 Hz(fundamental frequency),150 Hz and 200 Hz harmonics into the electromagnetic force.Moreover,with the increment of either the air-gap eccentricity/rotor interturn short circuit degree or the distance between the short circuit position and the big tooth,the end winding electromagnetic force/vibrations will be increased.In addition,compound faults have a more severe effect on the end winding vibration.Due to the action of electromagnetic force of the stator winding,the nose part is the location of maximum deformation,while the joint to connect the end part and the linear sections is prone to insulation wearing,which should be a key concern in the manufacture and later maintenance.

关 键 词：同步发电机 转子匝间短路 气隙偏心 电磁力 绕组振动 

分 类 号：TM311[电气工程—电机]