Abstract: The invention relates to an assembly and a method of fixing a rotor blade of a wind power plant. The wind power plant comprises a rotor blade, a pitch adjustment means, a bearing for the rotor blade and a brake disk. There is an electro-mechanical brake configured to apply a controlled brake force to the brake disk that is a function of the pitch angle of the rotor blade.

Abstract: The invention relates to a method and an arrangement for avoiding stray currents in a wind power plant. There is an insulating power source having a galvanic decoupled secondary side, an electrical load coupled to the secondary side of the insulating power source through an electrical conductor and a stray current sensitive mechanical component of the wind power plant. The insulating power source is located at a first side of the stray current sensitive mechanical component and the load is located at a second side of the stray sensitive mechanical component. The electrical conductor is coupled to a common ground potential at the second side.

Abstract: An emergency power supply device for a rotor blade adjustment system of a wind turbine is disclosed. The emergency power supply device includes a plurality of electric power accumulators and a plurality of electric charging units. The number of charging units corresponds to the number of electric power accumulators. An electric circuit is operable to electrically couple each of the electric charging units to a plurality of the electric power accumulators and each of the electric power accumulators to a plurality of the charging units.

Abstract: A method of operating a rotor-blade pitch controlling drive of a wind turbine comprising supplying electrical energy to an electrical working load by a primary electrical energy supply, charging an electrical energy storage device by means of a charger, supplying electrical energy to the electrical working load by the electrical energy storage device if the primary electrical supply fails, and temporally disconnecting the electrical energy storage device from the charger in successive intervals, while applying an electric test load to the electrical energy storage device and observing the electrical discharge of the electrical energy storage device.

Abstract: The invention relates to an assembly and a method of fixing a rotor blade of a wind power plant. The wind power plant comprises a rotor blade, a pitch adjustment means, a bearing for the rotor blade and a brake disk.

Abstract: The invention relates to a method and an arrangement for avoiding stray currents in a wind power plant. There is an insulating power source having a galvanic decoupled secondary side, an electrical load coupled to the secondary side of the insulating power source through an electrical conductor and a stray current sensitive mechanical component of the wind power plant. The insulating power source is located at a first side of the stray current sensitive mechanical component and the load is located at a second side of the stray sensitive mechanical component. The electrical conductor is coupled to a common ground potential at the second side.

Abstract: Disclosed is a method for operating a rotor blade adjustment drive for a wind turbine, in which an electric working load (23) is powered by an electric primary power supply (26) and, in case of a failure of said primary power supply (26), by an electricity accumulator (20). The accumulator (20) is charged by an electric charger (22). Furthermore, the accumulator (20) is temporarily disconnected from the charger (22) at successive intervals, and an electric test load (30) is applied thereto, the resulting electric discharge of the accumulator (20) being observed.

Abstract: The invention relates to an emergency power supply device for a rotor blade adjustment system (10) of a wind turbine (1), comprising a plurality of electric power accumulators (16, 17, 18), an electric charging unit (20) and an electric circuit arrangement (19) by means of which the charging unit (20) can be electrically coupled to a plurality of the power accumulators (16, 17, 18), one or more additional charging units (21, 23) being provided such that the number of charging units corresponds to the number of power accumulators. The circuit arrangement (19) can be used to electrically couple each of the charging units (20, 21, 22) to a plurality of power accumulators (16, 17, 18) and each of the power accumulators (16, 17, 18) to a plurality of charging units (20, 21, 22).

Abstract: A functionality test method for a technical system having at least one technical component to be regularly tested. The method including the steps of defining a test interval by setting a minimum time interval and a maximum time interval between two successive tests of the technical component, defining a test range for a decision parameter, sensing an actual value of the decision parameter, and performing a functionality test of the technical component if the minimum time interval between two successive tests of the technical component has elapsed and the sensed actual value of the decision parameter is within the predefined test range, or the maximum time interval between two successive tests of the technical component has elapsed.

Abstract: A functionality test method for a technical system having at least one technical component to be regularly tested. The method including the steps of defining a test interval by setting a minimum time interval and a maximum time interval between two successive tests of the technical component, defining a test range for a decision parameter, sensing an actual value of the decision parameter, and performing a functionality test of the technical component if the minimum time interval between two successive tests of the technical component has elapsed and the sensed actual value of the decision parameter is within the predefined test range, or the maximum time interval between two successive tests of the technical component has elapsed.

Abstract: A wind turbine. The wind turbine includes a blade pitch control system to vary a pitch of one or more blades and a turbine controller coupled with the blade pitch control system. A first power source is coupled with the turbine controller and with the blade pitch control system to provide power during a first mode of operation. Uninterruptible power supplies coupled to the turbine controller and with the blade pitch control system to provide power during a second mode of operation. The turbine controller detects a transition from the first mode of operation to the second mode of operation and causes the blade pitch control system to vary the pitch of the one or more blades in response to the transition.

Abstract: A wind turbine. The wind turbine includes a blade pitch control system to vary a pitch of one or more blades and a turbine controller coupled with the blade pitch control system. A first power source is coupled with the turbine controller and with the blade pitch control system to provide power during a first mode of operation. Uninterruptible power supplies coupled to the turbine controller and with the blade pitch control system to provide power during a second mode of operation. The turbine controller detects a transition from the first mode of operation to the second mode of operation and causes the blade pitch control system to vary the pitch of the one or more blades in response to the transition.