13-11-2014, 12:21 PM
Abstracts: In India there are so many industries in different fields. For example steel sector, Oil sector, Irrigation etc., All industries have many drives and equipment’s like conveyor belts, pumps, Mills etc., All the drives of industries use electrical motors. Most of the electrical motors are designed for three phase, 50Hz (in India) supply. These three phase motors are less expensive than starting of DC motors. Starting of AC 3-phase induction motors is less expensive than starting of DC motors as they require simple D.O.L or Star/delta starters. D.O.L or Star/delta starters generally have only over load protection. Three phase induction motors are very sensitive and get damaged, when they are subjected to Single phasing. In this context we need to design a preventer which prevents these mishaps and protects the costly motor under such conditions. The single phase preventer designed by my self is very less expensive and protects reliably the motor which is very costly.