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汽轮发电机转子匝间短路对定子热响应特性的影响

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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.
Impact of rotor interturn short circuit on stator thermal response characteristics in turbo generator
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 me-chanical 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 cur-rent 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 de-grees.Finally,the experiment was taken on the CS-5 prototype generator to obtain the stator tempera-ture.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 rein-forced 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.

turbo generatorrotor interturn short circuitreinforced exciting current actionloss charac-teristicstatorthermal response

张文、何玉灵、徐明星、代德瑞、王晓龙、李俊卿

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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

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

华北电力大学苏州研究院,江苏 苏州 215123

华北电力大学 电力工程系,河北 保定 071003

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汽轮发电机 转子匝间短路 强励动作 损耗特性 定子 热响应

国家自然科学基金河北省自然科学基金中央高校基本科研业务费专项基金河北省第三批青年拔尖人才支持计划河北省高层次人才资助项目苏州市社会发展科技创新项目河北省研究生创新能力培养资助项目

52177042E20225020032023MS128[2018]-27B20231006SS202134CXZZBS2023149

2024

10.15938/j.emc.2024.06.002

电机与控制学报
哈尔滨理工大学

电机与控制学报

CSTPCD北大核心
影响因子：1.014
ISSN：1007-449X
年,卷(期)：2024.28(6)