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负序电流对同步发电机的危害同步发电机带不对称负荷运行时,根据对称分量法分析:在定子绕组中,除原有正序电流分量随负荷不对称度的增大而减少外,还出现随不对称度增大而增大的负序电流。由于负序电流产生的负序气隙旋转磁场和转子旋转方向相反,便在同步发电机的磁极绕组中感应出二倍工频电流,此二倍工频电流产生的磁场又在定子绕组中感应出三倍工频电流。如此相互感应,于是在转子绕组中出现偶次谐波(2、4、6……)电流;在定子绕组中出现奇次谐波(3、5、7……)电流。上述效应不仅使发电机电势波波形发
Negative sequence current hazards of synchronous generators Synchronous generator with asymmetric load operation, according to the analysis of symmetrical components: In the stator windings, in addition to the original positive sequence current component decreases with increasing load asymmetry Appear with increasing asymmetry increased negative sequence current. Due to negative sequence current, negative-sequence air-gap rotating magnetic field and rotor rotate in the opposite direction, a double frequency current is induced in the pole winding of the synchronous generator, and the magnetic field generated by the double frequency current is induced in the stator winding Three times the power frequency current. So mutual induction, so appear in the rotor winding even harmonics (2,4,6 ......) current; in the stator winding appear odd harmonics (3,5,7 ...) current. The above effect not only makes the generator potential waveform wave form