汽轮发电机内部故障振动特性分析及在线监测方法研究

发布时间：2018-02-13 19:22

本文关键词： 汽轮发电机转子短路端部绕组振动分析监测系统　出处：《华北电力大学》2014年博士论文　论文类型：学位论文

【摘要】：本文以汽轮发电机转子绕组匝间短路故障为研究对象,分析了发电机在正常运行状态和转子匝间短路故障状态下的转子受力特性和不平衡电磁力特性,并对电机定子端部绕组的受力特性和振动特性进行了研究。本文的主要研究成果如下： (1)根据实验电机的具体参数,建立了发电机有限元分析模型,对发电机转子绕组短路故障下的不平衡电磁力进行精确求解,分析比较了工程实际中用于计算不平衡电磁力的等效磁通法和磁势叠加法。并对实际机组进行了转速特性试验,对机组的一些常见事故进行机理分析。 (2)分析了发电机端部绕组在各种内部故障下的磁场情况及端部绕组线棒在各内部故障下的电流、电压变动情况,进而分析端部绕组在各故障磁场下受到的洛伦磁力、不平衡电磁拉力情况,并在此基础上分析端部绕组在交变径向力、切向力和轴向力作用下的振动情况。 (3)根据端部绕组的受力变化,自行编制了端部绕组振动故障分析及监测系统,并在电厂机组中投入试用,取得很好的效果,为实时故障监测提供有益的参考。
[Abstract]:In this paper , the rotor winding turn - to - turn short - circuit fault of steam turbine generator is studied . The characteristics of rotor ' s stress and unbalanced electromagnetic force in the fault condition of rotor turn - to - turn short - circuit fault are analyzed , and the stress characteristics and vibration characteristics of stator end windings are studied . ( 1 ) According to the specific parameters of the experimental motor , the finite element analysis model of the generator is established , and the unbalance electromagnetic force in the short - circuit fault of the rotor winding of the generator is accurately solved , and the equivalent magnetic flux method and the magnetic potential superposition method for calculating the unbalanced electromagnetic force in the engineering practice are compared and compared . ( 2 ) The magnetic field of the end windings of the generator and the current and voltage fluctuation of the end winding bars under various internal faults are analyzed , and the Lorentz magnetic force and the unbalanced electromagnetic tension of the end windings under each fault magnetic field are analyzed , and the vibration conditions of the end windings under the action of alternating radial force , tangential force and axial force are analyzed . ( 3 ) According to the stress change of the end winding , the vibration fault analysis and monitoring system of the end windings are compiled , and the test is put into the power plant unit to achieve good effect , which can provide beneficial reference for real - time fault monitoring .

【学位授予单位】：华北电力大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM311

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