基于有限元法的汽轮发电机转子绕组匝间短路时的电磁场分析

根据汽轮发电机发生转子匝间短路时其电磁特性和相关电气量的变化特征，采用有限元法对汽轮发电机转子匝间短路故障进行研究。运用有限元程序对汽轮发电机电磁场进行了仿真计算，得到了汽轮发电机正常情况下以及不同程度、不同位置转子绕组匝间短路时的电磁场分布图。对故障前后气隙磁密及谐波进行了比较分析，找出了故障特征，从而为进一步分析转子绕组匝间短路故障奠定了基础。

Electromagnetic Field Analysis on Inter-turn Short Circuit of Rotor Winding for Turbogenerator Based on Finite Element Method

According to the variable characteristics of electromagnetic speciality and the related electrical quantities when inter-turn short circuit of rotor winding occurs in turbogenerators, the finite element method is proposed to be used for short circuits fault. The electromagnetic field of turbogenerator is simulated and calculated by the finite element procedure. Consequently, the electromagnetic distribution diagram is achieved under the normal state of turbogenerator and rotor winding inter-turn short circuit with different degrees and positions. Through the comparison of the air gap magnetic flux density and the harmonics before and after fault conditions, the fault features can be identified, which establishes the foundation for further analysis of rotor winding inter-turn short circuit fault.