发电机三次谐波电压接地保护的误动分析

Analysis of Motor Third Harmonic Voltage Grounding Protection False Tripping

发电机在正常运行的情况下,其有功和无功变化时三次谐波电压的幅值与相位均发生变化,造成三次谐波电压保护误动现象时有发生。对此,介绍了发电机三次谐波电压的特点和主要特征,并按三次谐波电压构成定子接地保护的原理作分析探讨。

Under the normal operation of motor,the amplitude and phase of third harmonic voltage both changes when the active and reactive change,which resulting in the third harmonic voltage protection false tripping occurs.In this regard,the features of third harmonic voltage motor are introduced.The main features of stator grounding protection principle constituted of third harmonic voltage are discussed and analyzed.