EXCITATION SYSTEMS REQUIREMENTS
a. Meet specified response criteria.
b. Provide limiting and protective functions are required to prevent damage to itself, the generator, and other equipment.
c. Meet specified requirements for operating flexibility
d. Meet the desired reliability and availability, by incorporating the necessary level of redundancy and internal fault detection and isolation capability.
Ø provides dc power to the synchronous machine field winding constituting the power stage of the excitation system.
Ø Process and amplifies input control signals to a level and form appropriate for control of the exciter.
Ø This includes both regulating and excitation system stabilizing function.
Ø Senses generator terminal voltage, rectifier and filters it to dc quantity, and compares it with a reference which represents the desired terminal voltage.
Ø provides an additional input signal to the regulator to damp power system oscillation.
Ø These include a wide array of control and protective function which ensure that the capability limits of the exciter and synchronous generator are not exceeded.