汽轮发电机转子匝间短路对定子热响应特性的影响  

Impact of rotor interturn short circuit on stator thermal responsecharacteristics in turbo generator

作　　者：张文[1] 何玉灵[1,2,3] 徐明星 代德瑞 王晓龙 李俊卿[4] ZHANG Wen;HE Yuling;XU Mingxing;DAI Derui;WANG Xiaolong;LI Junqing(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 of North China Electric Power University,Suzhou 215123,China;Department of Electrical Engineering,North China Electric Power University,Baoding 071003,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 [4]华北电力大学电力工程系,河北保定071003

出　　处：《电机与控制学报》2024年第6期13-24,共12页Electric Machines and Control

基　　金：国家自然科学基金(52177042);河北省自然科学基金(E2022502003);中央高校基本科研业务费专项基金(2023MS128);河北省第三批青年拔尖人才支持计划([2018]-27);河北省高层次人才资助项目(B20231006);苏州市社会发展科技创新项目(SS202134);河北省研究生创新能力培养资助项目(CXZZBS2023149)。

摘　　要：本文分析了汽轮发电机转子匝间短路故障前后定子热响应特性,不仅考虑转子匝间短路引起电压下降对发电机强励动作的影响,还研究了热分布不平衡而引起的定子力学响应。首先推导了正常情况和转子匝间短路故障后加强励磁电流下的气隙磁通密度,得到了铁心损耗和绕组铜耗的解析表达式;然后建立了发电机故障前后的三维有限元仿真模型,对不同短路程度故障下的铁心损耗、绕组铜耗与定子温度进行了求解计算;最后实测了CS-5型故障模拟发电机在正常运行和不同短路程度故障下的定子温度,实验结果与理论分析、有限元仿真结果基本一致。结果表明,转子匝间短路故障后由于励磁电流的增强,发电机铁心损耗和绕组铜耗均会增加,定子温度明显上升,并且随着短路程度的增加而加剧;定子端面边缘位置的变形和应力幅值最大并且为热响应下的危险位置。The thermal properties of the stator were studied before and after the rotor interturn short circuit fault(RISC)in the turbo generator.Different from the other research,not only the impact of voltage sag caused by the RISC fault was analyzed on the reinforcement of exciting current action but also the mechanical response of the stator was studied due to the unbalanced thermal distribution.Firstly,the air gap magnetic flux density expression in the normal case and the RISC condition with reinforced exciting current were deduced to obtain the core loss and copper loss formulas.Then the 3D finite element simulated model was established to calculate the core loss,copper loss and stator temperature in different RISC degrees.Finally,the experiment was taken on the CS-5 prototype generator to obtain the stator temperature.The experiment result is consistent with the theoretical analysis and the finite element calculation.It shows that the core loss and copper loss will increase as well as the stator temperature due to the reinforced exciting current after RISC happens.As RISC increases,the stator temperature will increase more obviously.The edge of the stator end face has the largest amplitude of deformation and stress,making it the most vulnerable position under thermal response.

关 键 词：汽轮发电机 转子匝间短路 强励动作 损耗特性 定子 热响应 

分 类 号：TM311[电气工程—电机]