Protecting 3 phase motors from single phasing

Abstract

For proper working of any 3 phase appliance, it must be connected to a 3 phase alternating current (ac) power supply of rated voltage and load. Once these three-phase appliances for example induction motors are started, they will continue to run even if one of the three-phase supply lines gets disconnected. The loss of current through one of these phase supplies is described as single phasing. Even though the motor will continue to operate in this condition, the motor will heat up very quickly, and it is essential that the motor be removed from service. Our methodology included; research and study of single phasing, simulate and implement an electronic circuit that switches off motors when single phasing occurs and we had to compare our solution to the available ones. We managed to do all the above.