Analysis of a Three-Phase Delta-Connected Inductive Load Controlled by an SCR-Diode Switch

A detailed analysis is presented of a system consisting of a three-phase delta-connected inductive static load controlled by a thyrode (SCR and diode) controller. The current equations are developed for a three-phase delta-connected inductive circuit representing the steady-state model of an induction motor. The simulated and actual current and voltage waveforms of an induction motor controlled by such an SCR-Diode controller are illustrated. The frequency/power spectra of the phase and line current are also presented.