气隙偏心对同步发电机定子绕组温升特性的影响  

Impact of Air-gap Eccentricity on Stator Winding Temperature in Synchronous Generators

作　　者：何玉灵[1] 张文浩[1] 孙凯[1] 杨培杰 王世云 唐玲 HE Yuling;ZHANG Wenhao;SUN Kai;YANG Peijie;WANG Shiyun;TANG Ling(Hebei Key Laboratory of Electric Machinery Health Maintenance Failure Prevention(North China Electric Power University),Baoding 071003,China)

机构地区：[1]河北省电力机械装备健康维护与失效预防重点实验室(华北电力大学),河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2024年第5期74-84,共11页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52177042);河北省自然科学基金资助项目(E2020502032);中央高校基本科研业务费专项资金资助项目(2020MS114,2018YQ03);河北省第三批青年拔尖人才支持计划([2018]-27).

摘　　要：为了分析同步发电机气隙偏心对定子绕组的铜耗及温升的影响规律。首先理论推导了正常情况和偏心下的磁通密度及相应的铜耗,分析了绕组的温升特性;然后建立了CS-5型故障模拟发电机的三维有限元模型,计算得到了发电机在不同负载和不同故障程度下定子绕组的铜耗和温度变化规律;最后在CS-5型故障模拟发电机上对定子绕组温度进行了实测,所得实验结果和仿真数据与理论分析结论基本一致。研究发现:定子绕组直线段温度高于端部温度;定子绕组的铜耗和温度在气隙偏心工况下均高于正常情况,且随着偏心量和负载的增加呈现升高趋势;在静偏心下靠近小气隙一侧的绕组温度高于其他部位。In order to explore the copper loss and the temperature of the stator winding under normal conditions and different air-gap eccentricity forms in synchronous generators,firstly,we derived the corresponding expressions of magnetic flux density.Then,we established the three-dimensional finite element model of the CS-5 generator and calculated the copper loss and the temperature of stator winding under different loads and fault degrees.Finally,we measured the stator winding temperature on the CS-5 prototype generator.The results of simulation and experiments are generally consistent with the theoretical analysis conclusions.It is shown that the temperature of the straight section is higher than that at the end.The stator winding temperature in normal conditions is lower than that in the air-gap eccentricity conditions.And with the increase of eccentricity and load,the loss and the temperature show an increasing trend.In addition,the stator winding temperature in the minimum air-gap point is higher than other parts under static air-gap eccentricity.

关 键 词：同步发电机 气隙偏心 气隙磁密 损耗 定子绕组温度 

分 类 号：TM31[电气工程—电机]