Motor-driven exciters for turbine alternators

THIS PAPER presents a study of the performance of a motor-driven excitation set designed for large turbine alternators connected to modern power systems. This excitation set has been so designed that its performance, both steady state and transient, is essentially comparable with the usual direct-connected (shaft-driven) exciter even when the driving motor is receiving its voltage from the alternator to which the generator is supplying excitation.