Abstract: A surgical instrument for transmitting torque is described. The surgical instrument comprises a torque receiving portion at a proximal end of the surgical instrument, a torque delivering portion at a distal end of the surgical instrument, and a flexible shaft extending between the torque receiving portion and the torque delivering portion. The flexible shaft comprises torque transmitting elements coupled in series along a longitudinal direction of the shaft such that one of the torque transmitting elements is rotationally fixed and tiltable relative to an adjacent one of the torque transmitting elements, wherein each of the torque transmitting elements comprises a through-hole. The surgical instrument also comprises an elongate alignment member extending through the through-holes of the torque transmitting elements, wherein the alignment member is made from a spring-elastic material.

Abstract: A method for feeding electrical power into an electrical, three-phase supply network by means of an inverter device, wherein the electrical supply network has a three-phase line voltage with a first, second and third line voltage phase, comprising the steps: feeding the electrical power during normal operation if a fault-free operation has been identified for the electrical supply network, wherein during normal operation a positive sequence voltage and optionally a negative sequence voltage is recorded from the line voltage and a reactive current is specified at least depending on the positive sequence voltage and optionally depending on the negative sequence voltage, and changing to a fault operation if a voltage change in the line voltage meets a predetermined fault criterion, in particular if the voltage change exceeds a predeterminable minimum amount of change or a minimum amount of change gradient, wherein during the fault operation, at least directly after the change, the reactive current is specified d

Abstract: A method for feeding electrical power into an electrical, three-phase supply network by means of an inverter device, wherein the electrical supply network has a three-phase line voltage with a first, second and third line voltage phase, comprising the steps: feeding the electrical power during normal operation if a fault-free operation has been identified for the electrical supply network, wherein during normal operation a positive sequence voltage and optionally a negative sequence voltage is recorded from the line voltage and a reactive current is specified at least depending on the positive sequence voltage and optionally depending on the negative sequence voltage, and changing to a fault operation if a voltage change in the line voltage meets a predetermined fault criterion, in particular if the voltage change exceeds a predeterminable minimum amount of change or a minimum amount of change gradient, wherein during the fault operation, at least directly after the change, the reactive current is specified d

Abstract: A method for feeding electrical power into an electrical supply network by means of at least one wind farm respectively connected to the supply network via a network connection point, wherein the supply network is to be operated at a network frequency, and each wind farm has a plurality of wind power installations, comprising the steps of determining whether the electrical supply network is operating, starting the at least one wind farm in a black-start mode for the purpose of producing electrical power for feeding into the supply network if the supply network is not operating, operating the at least one wind farm in black-start operation in which electrical power is fed into the supply network and the supply network is operated thereby, wherein the network frequency is specified by the feeding-in of the electrical power in the black-start mode and/or during black-start operation.

Abstract: A method for feeding electrical power into an electrical supply network by means of at least one wind farm respectively connected to the supply network via a network connection point, wherein the supply network is to be operated at a network frequency, and each wind farm has a plurality of wind power installations, comprising the steps of determining whether the electrical supply network is operating, starting the at least one wind farm in a black-start mode for the purpose of producing electrical power for feeding into the supply network if the supply network is not operating, operating the at least one wind farm in black-start operation in which electrical power is fed into the supply network and the supply network is operated thereby, wherein the network frequency is specified by the feeding-in of the electrical power in the black-start mode and/or during black-start operation.

Abstract: A method for feeding electric power into an electric supply network by means of a wind park comprising several wind turbines. The method comprises the steps of feeding the electric power at a network connection point, recording at least one network state parameter at the network connection point by means of a park control unit, checking the supply network for the presence of a transient process and sending, and/or sending at an increased clock rate, the values measured by the park control unit and/or the control values determined by the park control unit to the wind turbines, once the presence of a transient process has been detected.

Abstract: A method for feeding electric power into an electric supply network by means of a wind park comprising several wind turbines. The method comprises the steps of feeding the electric power at a network connection point, recording at least one network state parameter at the network connection point by means of a park control unit, checking the supply network for the presence of a transient process and sending, and/or sending at an increased clock rate, the values measured by the park control unit and/or the control values determined by the park control unit to the wind turbines, once the presence of a transient process has been detected.

Abstract: According to embodiments of the invention, a method is provided for the feeding of a multiphase electric network by means of an electric generator of a regenerative energy source that is connected to the network through an inverter. In the event of the occurrence of a non-symmetrical network fault, the feed to the phases that are not affected by the fault is interrupted and a current effecting voltage back-up voltage is fed to the affected phases.

Abstract: In a method for supplying a multiphase electric network (17) by means of an electric generator (1) of a regenerative power source, the generator being connected to the network (17) via a converter (4 to 12), by which the amplitude of the fed current and the phase angle thereof relative to the voltage can be controlled, according to the invention the controls for the individual phases are carried out independently of one another.