Depiction of New Static - Starting and Excitation Systems to start Short Circuit Generators

Short circuit plants are used mainly for testing and R&D activities. These plants are faced with high maintenance and down time due to the excitation system. Motor driven rheostats, rotating exciter failures, Commutator and carbon brushes deterioration, and disturbances in bearing location are just a few of the typical problems of these aged short circuit plants. The result is long down time of the generator system. The replacement of the rotating exciter and associated equipment for static excitation systems provides the positive solutions to these problems. The static exciter offers the design flexibility of easy retrofit for both small and larger rotating exciter systems. Additionally, it eliminates the maintenance overhead common to the brush type exciter. This paper will discuss the static excitation system of 1500 MVA, 12.5 kV, 3000 rpm, 50 Hz Short Circuit (S.C) Generator. Also explain how the S.C.Generator reaches 3000 rpm and its resultant wave form. This generator is functional at Bhopal unit of Central Power Research Institute.