Motor-driven exciters for turbine generators

THE PURPOSE OF this article is to point out the important factors involved and describe a reasonably simple method of calculating the required characteristics of motor-driven exciters for turbine generators. Such calculations are required to insure that the performance of the motor-generator set exciter will be comparable to that of a directly connected exciter during system disturbances. Although the method can be applied to any type of auxiliary supply system, the material in this article applies specifically to the auxiliary system in the Elrama Station of the Duquesne Light Company, Pittsburgh, Pa. A schematic diagram of this station is shown in Figure 1.