考虑气隙偏心时转子匝间短路因素对同步发电机端部绕组振动的影响

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (14) : 112-121.

论文

考虑气隙偏心时转子匝间短路因素对同步发电机端部绕组振动的影响

徐明星1,2，何玉灵1,2,3，张文1,2，代德瑞1,2，刘翔奥1,2，唐贵基1,2

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Impact of short circuit factors on end winding vibrations in generators considering air-gap eccentricity

XU Mingxing1,2，HE Yuling1,2,3，ZHANG Wen1,2，DAI Derui1,2，LIU Xiang’ao1,2，TANG Guiji1,2

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摘要

端部绕组振动是导致绝缘磨损和退化的关键因素之一。本文研究了同步发电机在转子匝间短路下的端部绕组振动特性。不同于以往的研究，本文不仅考虑了转子匝间短路程度，还研究了转子匝间短路位置和气隙偏心程度对端部绕组振动的影响。首先理论推导得出定子端部绕组的受力表达式；然后基于电磁-结构耦合模型得到了绕组电磁力及其力学响应特性，如变形、应变和应力；最后在CS-5故障模拟发电机进行实验验证。实验结果与理论分析、有限元计算结果基本一致。结果表明，转子匝间短路会给绕组电磁力带来额外的50Hz（基本频率）、150Hz和200Hz的谐波。随着气隙偏心程度/转子匝间短路程度/短路位置与大齿之间距离增大，端部绕组电磁力/振动加剧。此外，复合故障对端部绕组振动影响更为严重。在定子绕组电磁力作用下，定子绕组鼻端部位为最大变形位置，同时绕组直线段与端部的连接处易发生绝缘磨损，在制造及后期维护中应重点关注。

Abstract

End winding vibration is one of the key factors that lead to the insulation wearing and degrading. This paper presents a comprehensive study on the end winding vibration properties in synchronous generators under rotor interturn short circuit cases. Different from other studies, this work investigates not only the influence of rotor interturn short circuit degrees, but also the rotor interturn short circuit positions and the air-gap eccentricity on the end winding vibrations. Firstly, the expression of the end winding electromagnetic force is obtained through theoretical derivation. Then, the winding electromagnetic forces and response characteristics, such as deformation, strain and stress, are based on a coupled electromagnetic-structural model. Finally, experimental verification at the CS-5 fault simulator generator. The experimental results are basically consistent with the theoretical analyses and finite element calculations. It is shown that the rotor interturn short circuit will bring in extra 50Hz (fundamental frequency), 150Hz and 200Hz harmonics to the electromagnetic force. Moreover, with the increment of either the air-gap eccentricity/rotor interturn short circuit degree or the distance between the short circuit position and the big tooth, the end winding electromagnetic force/vibrations will be increased. In addition, compound faults have a more severe effect on the end winding vibration. Due to the electromagnetic force of the stator winding, the nose part is the location of maximum deformation, while the joint to connect the end part and the linear sections is prone to insulation wear, which should be a key concern in the manufacture and later maintenance.

导出引用

徐明星1, 2, 何玉灵1, 2, 3, 张文1, 2, 代德瑞1, 2, 刘翔奥1, 2, 唐贵基1, 2. 考虑气隙偏心时转子匝间短路因素对同步发电机端部绕组振动的影响[J]. 振动与冲击, 2024, 43(14): 112-121

XU Mingxing1, 2, HE Yuling1, 2, 3, ZHANG Wen1, 2, DAI Derui1, 2, LIU Xiang’ao1, 2, TANG Guiji1, 2. Impact of short circuit factors on end winding vibrations in generators considering air-gap eccentricity[J]. Journal of Vibration and Shock, 2024, 43(14): 112-121

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