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为了深入研究大型贯流式水轮发电机阻尼绕组的损耗和发热规律,建立了发电机二维电磁场和转子三维温度场有限元模型,考虑了电磁场时变、运动、非线性等因素对损耗的影响以及转子铁芯各向异性导热性能和磁极迎风面、背风面散热性能差异对发热的影响。在此基础上,以东方电机股份有限公司生产的36 MW贯流式水轮发电机为例,针对不同工况、结构和材料,对阻尼绕组的损耗和温度进行了综合计算和对比分析,并与实测数据进行了比较。结果表明,该模型计算精度高,发电机设计合理,研究结论对探讨大型贯流式水轮发电机阻尼绕组的损耗发热规律、改进其设计、提高发电机与电网的运行可靠性具有参考价值。
In order to study the law of loss and heat generation of damped winding of large tubular turbine generator deeply, the finite element model of two-dimensional electromagnetic field and three-dimensional rotor temperature field of generator was established. Considering the influence of time-varying, motion and nonlinear factors of electromagnetic field on loss The influence of the anisotropic thermal conductivity of the rotor core and the difference of the heat radiation performance on the windward side and the leeward side of the rotor core on the heat generation. Based on this, taking the 36 MW tubular turbine produced by Dongfang Electrical Machinery Co., Ltd. as an example, the loss and temperature of the damping winding are comprehensively calculated and compared for different operating conditions, structures and materials. Compared with the measured data. The results show that the model has high calculation precision and reasonable generator design. The conclusions of the study are of reference value for the discussion of heat loss law of damping winding of large tubular turbine generator, improvement of its design and improvement of operation reliability of generator and power grid.