Abstract:For the hydro turbine of Xiaolangdi Hydropower Station, a large amount of fatlute was formed in the operation of cylindrical valve hydraulic system of speed governor, which caused the phenomena of operation delay and jam of control valve group and influenced the safe and stable operation of unit. This paper analyzed the composition of fatlute and its causes, and selected equilibrium charge type oil filter for the online fatlute filtration by comparing two types of electrostatic oil filter, which had good using effect and the jam phenomenon of control valve group did not occur any more.

Keywords:Xiaolangdi Hydropower Station, hydro turbine, hydraulic system of speed governor, fatlute, equilibrium charge type oil filter, online fatlute filtration