Construction Of Automatic Phase Changer

Table 1 shows the variation in D.C voltage against the input public supply voltage.
    The normall open and close of the relay were identified with the and of  a digital metre to avoid wrong connection of the relay contact.
    Fig .5 is the detail circuit diagram of the system.
The output of the power supply unit which powers the relays was tested by making the relays to change – over immediately the power supplied. With a generator, the system was tested with public supply source. A single electric bulb was used for the testing. When the supply of public supply source is ON and the source of generator OFF the bulb whi9ch is the load lights, when the source of public supply sources is OFF and the generator switched ON the load, which is the bulb light.
PLANNING OF WORK
     Choose project.
     Collect information about project.
     Arrange the component
     Testing the component
     Design the circuit
     Cconnect the component according to circuit
     Testing circuit
     Checked by guide
     Final testing by project in change.
APPLICATION
Automation plays a predominant role in the modern scientific world. Automatic phase changer finds application in
     Residential
     Commercial offices
     Factories
     Hospitals/Banks
     Institutions
     It automatically supplies voltage in case of power failure or low voltage in up to 2 of the 3 incoming phases.
Automatic phase changer automatically cuts supply during low voltage thus, protects equipment from the hamful affects of unhealthy low voltage.
This unit automatically take the available phase lines and distribute to the non- available phase lines.