Abstract: Provided is a detecting device and a method for detecting a fault in a transformer of a wind turbine, wherein the transformer transforms a lower voltage, which is output from a generator of the wind turbine to a low voltage side of the transformer, to a higher voltage, which is output from the transformer at a high voltage side, the detecting device including: a voltage detection device configured to detect a voltage at a first node at the low voltage side of the transformer; a current detection device configured to detect a current at a second node at the high voltage side of the transformer. The detecting device is configured to detect the fault in the transformer based on the detected voltage and the detected current.

Abstract: Provided is a detecting device and a method for detecting a fault in a transformer of a wind turbine, wherein the transformer transforms a lower voltage, which is output from a generator of the wind turbine to a low voltage side of the transformer, to a higher voltage, which is output from the transformer at a high voltage side, the detecting device including: a voltage detection device configured to detect a voltage at a first node at the low voltage side of the transformer; a current detection device configured to detect a current at a second node at the high voltage side of the transformer. The detecting device is configured to detect the fault in the transformer based on the detected voltage and the detected current.

Abstract: Control method for a wind farm connected to a power grid (1) and comprising a plurality of generating units (2). The presence or absence of a voltage disturbance in the grid (1) is determined with the method, and when the presence of a disturbance is determined, the generating units (2) are controlled during said presence so that they generate the required power and the wind farm (100) thereby participates in stabilizing the grid (1). Furthermore, in the method, when the disappearance of said disturbance is determined, the required power continues to be generated with the generating units (2) for a limited time interval in order to provide a smooth and controlled transient until the voltage of the grid (1) stabilizes. Wind farm connected to a grid (1) and comprising a plurality of generating units (2).