Abstract: The function and construction of self-circulation oil system of lower combined bearing in the generator/motor were introduced which is energy-saving and high reliable. The operation status and operation data of Zhejiang Tongbai Pumped Storage Station, in which the self-circulation oil system is used, were analyzed. The analysis and comparison of operation data show that the operation status of the whole oil circulation system is well.

Key words: generator/motor, lower combined bearing, self-circulation oil system, operation status, data analysis, pumped storage unit