Sequence Component Based RMS Computation for the Detection of Single Phasing of SVPWM Fed Induction Motor

Abstract

Industry uses three phase induction motors (IMs) extensively because of its durability, low maintenance costs, high efficiency, self-starting torque, and other features. These days, industry also makes extensive use of ‘space vector pulse width modulation (SVPWM)’ and ‘pulse width modulation (PWM)’ fed induction motors for smooth control of IM. In all those situations, a strong protection plan is very necessary. Induction motor defects, if quickly identified, can minimize industry downtime. In this work, the root mean square (rms) value of the negative-sequence-component current was analysed to identify the single phasing condition of the SVPWM fed induction motor. ‘A-phase’ input current of the induction motor has been captured and recorded first, then negative sequence component's root-mean-square (rms) value was calculated. Comparing these values to the ideal situation, single phasing is detected. This suggested method thus allows for extremely early protection of induction motors.