Patent ID: 8405237
Filing Date: 2013-03-26
Classification: F03D,F05B,H02H,H02J,Y02B,Y02E

Abstract:
1. A wind energy installation, comprising: a rotor with rotor blades, the angle of incidence on which can be changed using a pitch adjustment device, and a servomotor connected to a pitch circuit and an emergency circuit, the rotor blades during normal operation being actuated by the pitch circuit and during emergency operation being actuated by the emergency circuit, and the emergency circuit comprising an electric energy store, a switching device, connection lines to the servomotor and a protection device, wherein the protection device comprises a power flow detector module configured to determine that electric power flowing from the electric energy store into the servomotor reverses direction and a discharge module configured to limit a voltage or a current response to the determination that the power flow from electric energy store into the servomotor reversed direction.