Abstract: The problems existed in speed regulating device of a hydropower station were analyzed, and improvement scheme was put forward. Its mechanical hydraulic speed governor was reformed into microcomputer controlled stepbystep hydroturbine governor, so the performance indicators of station regulating system reached the regulation in GB 9652—88, and the purposes of energysaving and efficiency improvement were realized.

Key words: speed regulating device, mechanical hydraulic speed governor, microcomputer controlled step-by-step hydroturbine governor