• Static Excitation System

     

    In static excitation system, all components are static or stationary and a portion of the AC from each phase of synchronous generator output is fed back to the field windings of the main generator through slip rings, as DC excitations, through a system of transformers, contrilled rectifiers, and reactors. The power supply to the rectifiers is from the main generator or the station auxiliary bus. An external source of DC is necessary for initial excitation of the field windings. On engine driven generators, the initial excitation may be obtained from the storage batteries used to start the engine.