The Detecting Method Study Of Turbo-generator Rotor Winding Fault

It is very necessary to monitor and diagnose the rotor winding inter-turn short circuit,which is one of the common generator faults. Through introducing the rotor basic structures and the fault reason of rotor winding inter-turn short circuit, the electromechanical combined diagnosis study is carried for rotor winding inter-turn short circuit. By analyzing the parameters changing under normal operation condition and rotor winding inter-turn short circuit fault condition,the rotor vibration characteristics and the stator winding parallel branches circulating current characteristics are investigated. Multi-resolution analysis and Wavelet Energy spectrum are used to analysis the signals of difference voltage and circular current when the rotor winding are faulty .and using wavelet packet to reduce noise of signals. Mallat's decomposition algorithm is applied to decompose the signals, in the end, the wavelet energy of the 6th detail is adopted to extract feature of the rotor wingding fault .