在线检测发电机转子绕组匝间短路的新方法  

New On-line Diagnosis Method for Generator Rotor Winding Inter-turn Short Circuit

作　　者：武玉才[1] 李和明[1] 李永刚[1] 赵艳军 万书亭[3] 

机构地区：[1]华北电力大学电气与电子工程学院,保定071003 [2]深圳中广核工程设计有限公司,深圳518124 [3]华北电力大学能源与动力工程学院,保定071003

出　　处：《高电压技术》2009年第11期2698-2703,共6页High Voltage Engineering

基　　金：国家自然科学基金(50677017);教育部博士点基金(20060079007)~~

摘　　要：针对转子绕组匝间短路故障频发的现场实际情况,首先分析了隐极同步电机转子绕组匝间短路后励磁磁势的变化,采用气隙磁导法分析了电机气隙磁场,指出转子匝间短路故障使电机气隙磁场不对称,从而产生不均衡的磁拉力。由力的相互作用原理可知,该磁拉力不仅作用于转子,改变转子基频振动,同时还影响定子铁心的振动。随后对不平衡磁拉力引发的定子铁心的振动模态进行了分析,得出了转子匝间短路后定子铁心基频振动幅值增大的结论。最后在MJF-30-6故障模拟发电机组上进行了转子绕组匝间短路模拟实验,实验结果表明,可以通过定子铁心基频振动诊断隐极同步电机转子匝间短路故障。Aiming at the frequent occurrence of rotor winding inter-turn short circuit fault in actual conditions, firstly, we analyze the change of concealed poles synchronization machine air-gap magnetic potential after rotor windings inter-turn short circuit fault. It is pointed out that this fault makes the machine air gap field dissymmetry, so unbalanced magnetic pull appears. According to the principles of interaction, this pull not only changes rotor fundamental frequency vibration, but also influences stator core vibration. Subsequently, the stator core vibration mode caused by unbalanced magnetic pull is analyzed, the conclusion is drawn that the value of stator core fundamental frequency vibration increases after rotor windings inter-turn short circuit fault. Finally, the rotor windings inter-turn short circuit fault simulation experiments are done on MJF-306 fault simulation generator of North China Electric Power University. We can detect rotor windings inter-turn short circuit fault of concealed poles synchronization machine by stator core fundamental frequency vibration.

关 键 词：同步电机 转子绕组匝间短路 气隙磁势 定子 振动 诊断 

分 类 号：TM311[电气工程—电机]