气隙静态偏心与定子短路复合故障对发电机定子振动特性的影响

发布时间：2019-01-22 18:57

【摘要】：分析了汽轮发电机在正常运行、气隙静态偏心故障、定子匝间短路故障、气隙静态偏心与定子匝间短路复合故障下的定子径向振动特性,以及各故障参数发展对定子振动特性的影响。首先对各情况下的气隙磁密进行了推导,得到引发定子振动的单位面积磁拉力表达式。然后分析了复合故障下定子径向振动特性及其与对应故障参数的变化关系。最后实测了SDF-9型故障模拟发电机的定子振动数据,结果与理论分析基本吻合。研究表明,正常情况和气隙静态偏心故障下发电机定子只有二倍频振动,但静偏心对应的二倍频振动幅值较正常情况要大;定子短路故障与复合故障下发电机定子都将产生二倍频、四倍频与六倍频径向振动,但复合故障所对应的振动幅值较大;复合故障下随着定子短路或气隙静态偏心程度的加剧,定子径向变形趋势及二倍频、四倍频与六倍频振动幅值均将增大;随着电机励磁电流的增大,定子径向变形趋势及二倍频、四倍频振动将增大,而六倍频振动则基本不变。
[Abstract]:The stator radial vibration characteristics of turbogenerator under normal operation, static eccentricity fault of air gap, short circuit fault between stator turns, combined fault of air gap static eccentricity and stator interturn short circuit are analyzed. And the influence of the fault parameters development on the stator vibration characteristics. Firstly, the air-gap magnetic density in each case is deduced, and the expression of magnetic pull force per unit area of stator vibration is obtained. Then, the radial vibration characteristics of the stator and the relationship between the radial vibration characteristics and the corresponding fault parameters are analyzed. Finally, the stator vibration data of SDF-9 type fault simulator are measured, and the results are in good agreement with the theoretical analysis. The results show that under normal condition and static eccentricity fault of air gap, the generator stator only has double frequency vibration, but the amplitude of frequency doubling vibration corresponding to static eccentricity is larger than that of normal condition. Under the stator short circuit fault and the complex fault, the generator stator will produce double frequency, four times frequency and six times frequency radial vibration, but the vibration amplitude corresponding to the complex fault is larger. With the increase of stator short circuit or the static eccentricity of air gap, the radial deformation trend and the frequency doubling, the amplitude of the fourth harmonic and the sixth harmonic vibration of the stator will increase under the complex fault. With the increase of the excitation current of the motor, the stator radial deformation trend and double frequency will increase, the fourth harmonic vibration will increase, but the sixth frequency vibration will not change.
【作者单位】：华北电力大学机械工程系;华北电力大学电力工程系;
【基金】：中央高校基本科研业务费专项资金资助项目(13QN49) 河北省自然科学基金资助项目(E2011502024) 国家自然科学基金资助项目(51307058,51177046,51107039)
【分类号】：TH165.3;TM311

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