A torsional protection system for protecting a wind turbine , the torsional protection system characterized by : a detection processing stage for isolating energy contained within a measured signal to a frequency band of interest, the detection processing stage having at least one input for the measured signal obtained from at least one component in the wind turbine, said measured signal being representative of subsynchronous oscillations in electrical and/or mechanical portions of the wind turbine ; a protection logic stage for comparing the energy to a threshold level to get an indication of an amount of the energy that is above a predetermined threshold over time, the protection logic stage further comprising: a threshold comparison stage connected to an output of the detection processing stage ; an integrator stage or a time delay stage connected to an output of the threshold comparison stage , wherein an output of the integrator stage or time delay stage represents the amount of energy accumulated over the predetermined threshold over time; and an alarm stage connected to the output of the integrator stage or time delay stage , wherein the alarm stage is configured for monitoring measured signal so that if the output of the integrator stage or time delay stage exceeds the predetermined level, at least one of an alarm and trip signal is generated. a detection processing stage for isolating energy contained within a measured signal to a frequency band of interest, the detection processing stage having at least one input for the measured signal obtained from at least one component in the wind turbine, said measured signal being representative of subsynchronous oscillations in electrical and/or mechanical portions of the wind turbine ; a protection logic stage for comparing the energy to a threshold level to get an indication of an amount of the energy that is above a predetermined threshold over time, the protection logic stage further comprising: a threshold comparison stage connected to an output of the detection processing stage ; an integrator stage or a time delay stage connected to an output of the threshold comparison stage , wherein an output of the integrator stage or time delay stage represents the amount of energy accumulated over the predetermined threshold over time; and an alarm stage connected to the output of the integrator stage or time delay stage , wherein the alarm stage is configured for monitoring measured signal so that if the output of the integrator stage or time delay stage exceeds the predetermined level, at least one of an alarm and trip signal is generated. a threshold comparison stage connected to an output of the detection processing stage ; an integrator stage or a time delay stage connected to an output of the threshold comparison stage , wherein an output of the integrator stage or time delay stage represents the amount of energy accumulated over the predetermined threshold over time; and an alarm stage connected to the output of the integrator stage or time delay stage , wherein the alarm stage is configured for monitoring measured signal so that if the output of the integrator stage or time delay stage exceeds the predetermined level, at least one of an alarm and trip signal is generated. <EOS>