同步发电机转子匝间短路故障时励磁电流谐波特性分析  

ANALYSIS OF GENERATOR EXCITATION CURRENT HARMONICS ON ROTOR WINDING INTER-TURN SHORT CIRCUIT FAULT

作　　者：万书亭[1] 李和明[2] 李永刚[2] 侯子利[2] 许兆凤[2] 

机构地区：[1]华北电力大学机械工程学院,河北省保定市071003 [2]华北电力大学电力工程系,河北省保定市071003

出　　处：《电力系统自动化》2003年第22期64-67,共4页Automation of Electric Power Systems

基　　金：电力青年科技促进费资助项目 (SPQKJ0 2 1 0 )~~

摘　　要：发电机正常运行时 ,电枢反应磁场与转子同步旋转 ,转子绕组不会感应附加谐波电流。当发生转子匝间短路故障时 ,气隙主磁场出现谐波 ,通过分析各次谐波的电磁特性 ,得出当谐波次数与发电机极对数满足一定关系时 ,电枢反应磁场与转子不同步旋转 ,从而在转子绕组中感应附加谐波电流 ,并给出谐波频率与气隙主磁场谐波次数、发电机极对数、转子机械转数的关系表达式。实测了MJF 30 6型同步发电机转子匝间短路故障时的励磁电流数据 ,结果表明 。When generator operates normally, armature reaction magnetic field synchronously rotates with rotor, and the additional harmonic current doesn't occur in the rotor winding. When rotor winding inter-turn short circuit fault happens, the harmonics of air-gap excitation magnetic field appear. Through analyzing the electromagnetism characteristic of each harmonic, it is concluded that the armature reaction magnetic field non-synchronously rotates with rotor when the harmonics' orders and the pole pairs of generator satisfies a certain relation. So additional harmonic current emerges in the rotor winding, and the equation of the additional harmonic is given, which is the function of air-gap excitation magnetic field harmonic frequency, pole pairs of generator and rotor mechanical revolution. The excitation current of MJF-30-6 synchronous non-salient pole generator is acquired when the rotor winding inter-turn short circuit fault occurs. These results verify that the theory analysis is right.

关 键 词：故障诊断 发电机 转子匝间短路 励磁电流 谐波特征 

分 类 号：TM31[电气工程—电机]