Automatic phase assortment

Digital phase selector

Digital phase selector which can also be known as Automatic phase selector as the name indicates automatic selection of phases when there is absent or discontinued due to fault or some other reasons of available phase.

This devices is used were there is availability of 3-ph i.e., (415v), 3-ph & 4-wire line. And you can also add many number of phases as you like.

Introduction

Hi I am DPS

Power instability in developing countries creates the need for automation sources of power to back-up the utility supply.

Most Industrial and commercial application are dependent on power supply and if the process of change over is manual, not only considerable time is wasted but also the device or machine may get damaged from human error during the change over connections, incurring massive losses.

Need of this device

Working Principle

Phase sensing & switching block :

The phase from which the power has to be taken is sensed and corresponding switching operation is performed.

Control logic block :

The control logic circuitry decides the phase priority for one out of Three lines.

Relay driver block :

The relay driver gets signal from the control logic circuit .

The relay driver section gives electrical signal

to the strip of the relay and relay

contacts closes thus the power

flows to load.

CIRCUIT DIAGRAM

Transformer ratings : 230/12 v.

Current : 5A

Relay ratings : Type: SMCU

Contact: 1.5A/230v

Coil : 12v, DC/300 ohms.

Preset resistor 5k.

Transistor : BC 548.

Ratings of components

Zener diode.

Capacitors : 25v, 100 micro F & 25v, 220 micro F.

Resistors : 10k ohm.

LED’s

Diode IN4007.

Power Interruption during running of

load can be eliminated.

Compact in size.

Economical.

No Mechanical contacts.

Can be used for all single phase loads.

Advantages of DPS :

Can be used in Apartments.

Used in EMERGENCIES i.e., in ICU ‘s, Operation Theatre’s.

Used in industries & offices.

In Shopping malls.

Can also be used engineering colleges.

Applications