Studies Related to the Operation of Solid Rotor Alternator

Abstract

Indian electrical industries supply industrial alternators for rectifier loads, arc furnace loads and thyristor load applications to various customers. These synchronous machines along with rectifier newlineloads are also used in HVDC system and AC exciters. In such cases the harmonics will be injected in from the supply side of the alternator making the generator line current distorted to trapezoidal waveform. newlineThese harmonics increases the losses in stator conductors. Negative-sequence currents which are due to load imbalance, will also induce 100Hz components in the field and damper windings. The solid iron rotor in case of large synchronous machines will have induced currents due to harmonic and unbalanced loads which cause additional losses and consequently temperature rise. This thesis emphasizes about the design aspects, constructional features and newlineexperimentation on Solid Rotor Alternator (SRA) to study its behavior under harmonic loads and unbalanced loads. newline