D.W.R.-synchronous-machine response to unbalanced faults

This short paper describes an investigation into the behaviour of a divided-winding-rotor (d.w.r.) synchronous generator, equipped with regulators for controlling the terminal voltage, torque angle and speed, when subjected to unbalanced short circuits at its terminals. The performance of the machine has been compared with that of a conventionally wound rotor arrangement. It has been observed that the d.w.r. arrangement exhibits exceptionally superior transient-performance characteristics compared with the c.w.r. machine, even under unbalanced-fault conditions, which the machine has to encounter more often in practice than balanced faults.