Abstract: Based on analysis of the insufficiency of mechanical braking, the common generator electrical braking method by shorting of stator three phase windings was discussed. According to this, two new braking methods were proposed and schematic diagrams were given. The features and applicable occasions of several electrical braking methods were analyzed and compared. The feasibility and practicability of high voltage side short circuit braking of generator transformer set and reverse connection braking for medium and small unit were pointed out. The discussion in this paper provides the groundwork for the rational selection of electrical braking method in hydropower plant.

Key words: hydroelectric generator set, electrical braking method, other braking methods, study and analysis