NOVELTY - The turbine has three transformers (100, 200, 300) transforming respective primary voltages (Vp1 - Vp3) to respective secondary voltages (Vs1- Vs3). An electric circuit (106) has a switching element (108) for providing a current path (112) parallel to a primary coil (102), where a primary voltage across the primary coil is reduced, when the current path is disconnected. Three electric circuits (106, 206, 306) include three damping components, respectively for limiting the current of respective three current paths (112, 212, 312).    USE - Used with a power generator for generating power for a power line of a power grid.    ADVANTAGE - The switching element of one electric circuit provides one current path parallel to the one primary coil, where one primary voltage across the primary coil is reduced, when the current path is disconnected, thus preventing over-voltage on a power grid side from reaching through to the power generator and sensitive equipment within the turbine. The switching element enables selective activation of the parallel current path only when required, thus protecting the wind turbine from over-voltage and efficiently reducing power consumption during normal operation, and hence increasing the power generation efficiency of the wind turbine. The three electric circuits include three damping components, respectively for limiting the current of respective three current paths, thus controlling the voltage reduction of the over-voltage, and hence minimizing distortions due to the electric circuits and preventing wind turbine damage.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for operating a wind turbine.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of a wind turbine.    Primary voltages (Vp1, Vp2, Vp3)    Secondary voltages (Vs1, Vs2, Vs3)    Wind turbine (1)    Power generator (2)    Lines (2a - 2c, 3a - 3c)    Power grid (3)    Rotor (5)    Gear box (7)    Transformers (100, 200, 300)    Primary coils (102, 202, 302)    Secondary coils (104, 204, 304)    Electric circuits (106, 206, 306)    Current paths (112, 212, 312)