同步发电机偏心与绕组短路故障对磁场及电磁振动的影响

发布时间：2018-08-07 15:27

【摘要】：以1台6 MW汽轮同步发电机为例,对转子静偏心、定子匝间短路及其联合故障下的磁场、电磁力和电磁振动进行研究。在气隙磁场不对称情况下,以等效电路为基础的经典算法将不再适用,为此建立发电机的有限元模型,基于瞬态磁场的计算结果,给出不同故障类型下的气隙磁场变化特征,并得到发电机不同运行状态下的径向电磁力及其与对应故障参数的变化关系。将电磁力作为载荷,对发电机的电磁振动进行研究,通过比较正常运行和故障运行状态下的位移曲线,定性分析不同故障对电磁振动的影响。研究结果表明:且该振动特征可以为发电机偏心和绕组短路故障诊断提供理论依据。
[Abstract]:Taking a 6MW turbo synchronous generator as an example, the magnetic field, electromagnetic force and electromagnetic vibration of the rotor under static eccentricity, stator inter-turn short circuit and its combined fault are studied. In the case of asymmetric air-gap magnetic field, the classical algorithm based on equivalent circuit is no longer applicable. For this reason, the finite element model of generator is established. Based on the calculation results of transient magnetic field, the variation characteristics of air-gap magnetic field under different fault types are given. The radial electromagnetic force and its relationship with the corresponding fault parameters are obtained. Taking electromagnetic force as load, the electromagnetic vibration of generator is studied, and the influence of different faults on electromagnetic vibration is analyzed qualitatively by comparing the displacement curves under normal operation and fault operation. The results show that the vibration characteristics can provide theoretical basis for the fault diagnosis of generator eccentricity and winding short circuit.
【作者单位】：哈尔滨理工大学电气与电子工程学院;
【基金】：国家自然科学基金资助项目(51107022) 黑龙江省杰出青年科学基金资助项目(JC2016010) 哈尔滨市科技创新人才研究专项资金(青年后备人才)资助项目(RC2014QN007005)~~
【分类号】：TM31

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