by detecting an abnormal variation that is out of the operating range of any of the measured variables the shunt protection circuit 13 is connected by activating the switches installed in this circuit using switching command 14 and at the same time cancelling the switching commands 12 of the inverter switches the connection of the shunt protection circuit 13 and the disconnection of the inverter 6 are therefore synchronous a voltage gap in the grid to which the generator 1 is connected is an example of abnormal operation in which the switching commands 12 14 will be governed as described in this situation when the inverter 6 is disconnected and the shunt protection circuit 13 is connected the asynchronous wound rotor generator functions as an asynchronous squirrel cage machine in which the rotor currents as shown in fig4 are closed by the resistor circuit imposed by the shunt protection circuit 13 thus the electrical disturbance that appears in the generator 1 due to the grid voltage gap will be absorbed by the shunt protection circuit 13 which due to its resistive nature will in turn dampen the disturbance the shunt protection circuit 13 must be duly dimensioned in order to be able to absorb the electrical disturbances that may appear in the generator 1 to which it is connected these disturbances may be especially strong when they start and may mean that large amplitude currents are circulating through the elements that compose the protection circuit 13 the protection shunt circuits 13 prevent the converter 4 from being affected by the generator 1 disturbances which allows the current peaks that may appear to circulate through circuits expressly designed for this sort of load instead of circulating these.