ANALYSIS OF INTER-TURN SHORT-CIRCUIT FAULT OCCURRED IN GENERATOR'S ROTOR WINDING
Ning Yinghui · Thermal Power Generation · 2012
During the time of repairing generator's rotor for 1 000 MW unit in one power plant,a larger deviation in a.c.impedance and power loss had been discovered,the variation of related parameters,such as excitation current,negative sequence current,and vibration value of the generator in operation,being compared.Through comparison historical values in a.c impedance and power loss tests of the rotor,and combined with the two-pole voltage balance method and the rotor voltage distribution method,a comprehensive analysis has been carried out,the inter-turn short-circuit fault existing in the rotor of generator being determined,the fault points being located in coil no1 of pole no2 and in coil no8 of pole no1.