大型核电汽轮发电机定子内部短路故障部电磁力分布研究

doi:10.19595/j.cnki.1000-6753.tces.170163

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Abstract The stator winding inter-turn short-circuit fault in nuclear power turbo-generator is one of the typical faults. It may cause rotor damage, slot wedges damage, windings fracture and some other serious problems. Therefore, it is important to know the distribution of electromagnetic force and the location in which the electromagnetic force concentration appears when the short circuit fault happens. First, a 2-D field-multi-loop circuit-motion coupled time-stepping finite element mathematical model for calculating the local electromagnetic force of giant nuclear power turbo-generator post-fault is presented, which combine the Maxwell stress and Lorentz formula. And then, a 1407MV·A nuclear turbo-generators is taken as an example, the radial and tangential force on rotor surface, the electromagnetic force on slot wall of stator and rotor, and the radial and tangential force on winding of stator and rotor under the giant nuclear power turbo-generator post-fault condition are calculated and analyzed. At the same time, the electromagnetic force distribution characteristics and relatively concentrated area in stator and rotor are achieved. Finally, the accuracy and rationality of calculation results are discussed. The research results of electromagnetic force in this paper can be applied to structure deformation analysis and fatigue analysis of the fault motor as a load. The proposed analysis idea for electromagnetic force can also provide a good reference for soling stator winding internal short-circuit fault, as well as other type motor.

Key words： Nuclear power turbo-generator internal short-circuit fault 2-D field-multi-loop circuit-motion coupled electromagnetic force

Received: 20 February 2017 Published: 12 April 2018

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TM311

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.170163 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I7/1497

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