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A Comprehensive Analysis on Transient Electromagnetic Force Behavior of Stator Windings in Turbo-Generator

机译：汽轮发电机定子绕组瞬态电磁力行为的综合分析

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摘要

This paper presents a comprehensive analysis on the transient electromagnetic force behavior of the stator windings in a QFSN-600-2YHG type turbo-generator. Different from other studies, this paper investigates not only the distribution regularities of the resultant force and the force density, but also the force harmonic characteristics, and the mechanical responses which will cause sensitive impact on the insulation wearing. The whole work is generally based on a proposed simplified model and the 3D finite element coupling calculation. The simplified model contains two parts. The first part is the theoretical model that employs the approximate solution of the image current to obtain the analytic formula of the electromagnetic force on the end windings conveniently. The second part is the FEA model that employs only the end windings and one-tenth of the stator core to save the calculating memory and, meanwhile, obtain the qualified electromagnetic force as well as the mechanical response. It is shown that the nose-top, the connection point between the line part and the end part, and the middle of the involute are the three most dangerous positions of the end winding to sustain serious insulation wearing. Moreover, the winding, which endures the maximum mechanical response, is neither always consistent with the one that has the largest resultant electromagnetic force nor directly in accordance with the winding that affords the most intensive electromagnetic force density. The findings in this paper will be beneficial for the insulation monitoring and the manufacturing improvement on the stator windings.
机译：本文对QFSN-600-2YHG型涡轮发电机中定子绕组的瞬变电磁力行为进行了综合分析。与其他研究不同，本文不仅研究合力和力密度的分布规律，而且研究力谐波特性以及对绝缘磨损产生敏感影响的机械响应。整个工作通常基于提出的简化模型和3D有限元耦合计算。简化模型包含两个部分。第一部分是理论模型，该模型采用镜像电流的近似解来方便地获得端部绕组上电磁力的解析公式。第二部分是FEA模型，该模型仅使用端部绕组和定子铁心的十分之一来节省计算内存，同时获得合格的电磁力和机械响应。结果表明，机头顶部，线路部分与端部之间的连接点以及渐开线的中间位置是端部绕组的三个最危险的位置，它们会导致严重的绝缘磨损。此外，承受最大机械响应的绕组既不总是与具有最大合力的电磁力保持一致，也不总是与提供最大强度的电磁力密度的绕组保持一致。本文的研究结果将有助于绝缘监测和定子绕组的制造改进。

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  • 来源
    《Mathematical Problems in Engineering》 |2018年第14期|4189609.1-4189609.16|共16页
  • 作者

    Jiang Hong-Chun; He Yu-Ling; Tang Gui-Ji; Xu Ming-Xing;

  • 作者单位

    North China Elect Power Univ Baoding, Sch Energy Power & Mech Engn, Beijing, Peoples R China;

    North China Elect Power Univ Baoding, Sch Energy Power & Mech Engn, Beijing, Peoples R China;

    North China Elect Power Univ Baoding, Sch Energy Power & Mech Engn, Beijing, Peoples R China;

    North China Elect Power Univ Baoding, Sch Energy Power & Mech Engn, Beijing, Peoples R China;

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