Advanced Single Phasing Preventer without Microcontroller

Abstract

For three phase induction motor, it is necessary that all the three phases of supply should present. While it is on load
when any one of the fuse goes out, or missing, the motor will continue to run with two phases only, but it will start drawing huge
current for the same load. This high current may run the motor unless switched of immediately. A single phasing preventer avoids
such a mishap with this circuit; the motor will not run unless all the three phases are present. 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 myself is very less expensive and protects reliably the motor which is very costly. In addition to this Single Phase Preventer we
had added a Blown Fuse Indicator circuit. Generally, when equipment indicates no power, the cause may be just a blown fuse. Itis
a circuit that shows the condition of fuse through LEDs. This circuit will give indicationwhen the fuse is blown due to over current.
This compact circuit is very useful and reliable. Ituses very few components, which makes it inexpensive too.