Turbine Global Products Integration Division Turbomachinery Headquarters Mitsubishi Power Ltd.
On the collector ring of a generator rotor, carbon brushes slide along the ring surface in order to carry direct current to the rotor. Therefore, the sliding surface of the collector ring wears over time and needs to be machined for reconditioning. However, this machining work can only be performed after the turning start becomes possible, near the end of the periodic inspection schedule, so if it is determined that machining is necessary during the periodic inspection, the inspection schedule needs to be extended. Such extension of the periodic inspection schedule is a significant problem for electric power companies and they may even abandon the implementation of machining. Reflecting such customer feedback, Mitsubishi Power, Ltd. developed generator rotor collector ring machining equipment that does not require turning and applied it to actual machines. This report presents the features of this machining equipment and examples of its application to actual machines.
(This article is written in Japanese and only the abstract is written in English.)
