Abstract: In order to decrease the operation power consumption of electro-static precipitator and to further raise the dust collecting efficiency, the original control system of electro-static precipitator in Wangting Power Plant unit No.11 was overall technically reformed by using “Energy-saving and Effect-raising type EP Power Supply and Control System”. After the reformation, the dust collecting power decreases by a factor of 81.2%， average dust collecting efficiency increases by a factor of 0.29%, and dust discharge amount at outlet decreases by a factor of 28.9%, so an obvious energy-saving and effect-raising result is obtained, and the operation automation level of electro-static precipitator is raised also. This affords useful experience for similar projects.

Key words: electro-static precipitator (EP), reformation, energy-saving, effect-raising