大型发电机转子匝间短路故障特征量的理论分析  

Theoretical Analysis of the Characteristic Quantity on Rotor Winding Inter-turn Short Circuit Fault for Huge Generators

作　　者：马铁军[1] 刘念[1] 刘琨 雷浩辖[1] 徐海霸[1] 

机构地区：[1]四川大学电气信息学院,成都610065 [2]山西长治供电公司,山西长治046000

出　　处：《大电机技术》2012年第4期21-24,共4页Large Electric Machine and Hydraulic Turbine

摘　　要：针对发电机常见故障之一的转子匝间短路,本文首先分析了正常情况和匝间短路情况下的转子磁势分布,并通过转子磁势分析进一步分析了转子与定子在匝间短路情况下的谐波情况,得出了定子绕组的1/2次谐波以及转子绕组的3/2次谐波都感生于定子的二次谐波电流的结论;同时,理论分析了匝间短路对发电机定子电流、定子电压、转子电流、转子电压、发电机输出有功和无功功率的影响,并通过MATLAB/SIMULINK进行了仿真,验证了理论分析的正确性;为发电机匝间短路故障判定的特征量选取奠定了基础。This paper analyzes the rotor magnetic potential distribution under normal and inter-turn short circuit condition,and obtains the conclusion that the 1/2th harmonic current of the stator winding and 3/2th harmonic current of the rotor winding are both born from the second harmonic current of the stator through the further analysis of harmonic under inter-turn short circuit fault.At the same time,this paper analyzes the stator current,stator voltage,rotor current,rotor voltage,the active and reactive power,which are affected by the inter-turn short circuit in theory.The analysis is verified by the simulation through the MATLAB/SIMULINK,and it will lay the foundation for choosing characteristic quantity that can determine the rotor winding inter-turn short circuit fault.

关 键 词：汽轮发电机 匝间短路 特征量 

分 类 号：TM311[电气工程—电机]