A wind energy installation can include a generator which is driven by a rotor and generates electrical power in a multiphase manner for feeding into a network, a converter which is connected to the generator and to the network, and a control system which interacts with the converter and includes a negative sequence system regulation mechanism. A working gas flows along the slit. The reservoir is located above the root level of a plant to be watered. Fastening means is fastened between the connection members in order to enable the clamp members to clamp the grout layer. The data processing system 110 is configured to receive data output from the line camera 106 and further configured to calculate and provide substantially contemporaneous information relating to a quality parameter of the material 102, 107. In the manipulator, a fluid is supplied to the space of the fixing member to inflate the fixing member so that a flexible cover for covering the end effector is fixed to the support member.