Abstract: A condition monitoring device for a lightning protection system (LPS) of a wind turbine blade, wherein the condition monitoring device is mountable to a wind turbine. The device includes, a signal generation unit configured to generate and input probe signals into a protection unit of the LPS and/or to at least one tower conducting unit. The device includes a measurement unit configured to detect response signals, which are a system response of the probe signals via a wireless coupling between the LPS and the tower conducting unit. A control unit is configured to control the signal unit and the measurement unit and to process the response signals.

Abstract: Embodiments according to the invention describe a method for monitoring the state of the powertrain or tower of a wind turbine (10), said method having the steps of: detecting data of a state monitoring system which is provided for a structure of the wind turbine (10), said structure being mechanically coupled to the powertrain or tower; processing the detected data of the state monitoring system which is provided for the structure of the wind turbine (10), said structure being mechanically coupled to the powertrain or tower; and determining the state of the powertrain or tower from the processed data of the state monitoring system which is provided for the structure of the wind turbine (10), said structure being mechanically coupled to the powertrain or tower.