Transient-stability studies of d.w.r. synchronous generator

Some transient-stability studies of a divided-winding-rotor (d.w.r.) synchronous generator equipped with regulators for controlling the voltage, torque angle and speed are described. It has been observed that the machine is quite capable of withstanding severe forms of load shedding, and that the angle regulator is quite effective in checking the magnitudes of rotor-angle swings. Other abnormalities, such as opening of excitation circuits, with and without external faults, have also been studied. The reversal of reactive-field current following a 3-phase short circuit has been found to be not absolutely essential for maintaining the stability of the machine. The torque-field excitation has been observed to be a major stabilising factor especially under leading-power-factor conditions.