Abstract: In Guangdong Huizhou LNG Power Plant, it was founded that the DC resistance of three gas turbine generator rotors increased during overhaul. The contact surfaces of the rotor windings were treated, the defect was eliminated, and the generators can operate safely. According to practical site state, a new method to treat the defect of DC resistance increase of rotor winding was proposed, in which it does not necessary to extract the rotor from the generator. By the method, a lot of time and materials was saved, and the overhaul risk was reduced.

Key words: gas turbine, generator, DC resistance of rotor winding, defect, treatment