Reigh Walling is the principal of Walling Energy Systems Consulting, LLC, where he provides his expertise in transmission, Type III Wind-Turbine Generator Fault Response: For the Type III WTG, severe faults cause excessive voltage to be induced onto the machine’s rotor, which are, in turn, imposed on the power converter. It is not economical to design the converter to withstand the voltages and currents imposed by the most severe faults. Thus, a crowbar function is used in practice to divert the induced rotor current. There are various approaches to achieving this crowbar functionality, including: