定子匝间短路位置对发电机定子振动特性的影响

发布时间：2018-05-01 20:31

本文选题：故障诊断 + 发电机　；参考：《振动工程学报》2017年04期

【摘要】：对气隙静偏心和定子短路故障的相对位置对定子振动特性的影响进行解析分析、数值计算和实验研究。首先推导得到了包含定子绕组短路位置信息的作用于定子单位面积的磁拉力解析表达式,分析得到了定子短路位置对磁拉力的影响;然后建立了算例发电机正常运行、气隙静偏心故障、气隙静偏心与定子匝间短路复合故障下的有限元模型,对不同短路位置下的定子磁拉力进行了仿真计算。并实测了MJF-30-6型故障模拟发电机定子不同短路位置的定子振动信号,三者结果相互吻合。结果表明:气隙静偏心与定子匝间短路复合故障下,同等故障程度时,发电机定子振动幅度与短路位置有关,短路位置越接近最小气隙处,各倍频振动幅度越大,越远离最小气隙处,各倍频振动幅度越小。
[Abstract]:The influence of the relative position of air gap static eccentricity and stator short circuit fault on the stator vibration characteristics is analyzed analytically, numerically and experimentally. The analytical expression of the magnetic pull force acting on the stator unit area including the information of the short circuit position of the stator winding is derived, and the influence of the short circuit position of the stator on the magnetic pull force is analyzed. Then, a calculation example is established for the normal operation of the generator. The finite element model of air gap static eccentricity fault, air gap static eccentricity and stator interturn short circuit is used to simulate the stator magnetic pull force in different short circuit positions. The stator vibration signals at different short circuit positions of the stator of the MJF-30-6 type fault simulator are measured, and the results are in good agreement with each other. The results show that the vibration amplitude of generator stator is related to the short circuit position when the air gap static eccentricity and stator inter-turn short circuit complex fault are same, and the shorter the short circuit position is, the greater the amplitude of each frequency doubling vibration is when the short circuit position is close to the minimum air gap. The farther away from the minimum air gap, the smaller the amplitude of frequency doubling vibration.
【作者单位】：华北电力大学机械工程系;
【基金】：国家自然科学基金资助项目(51177046,51307058) 河北省自然科学基金资助项目(E2015502008,E2015502013) 中央高校科研业务费专项目基金资助项目(2015ZD27)
【分类号】：TM31

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