digital phase selector
TRANSCRIPT
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Automatic phase assortment
Digital phase selector
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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
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Hi I am DPS
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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
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Working Principle
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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.
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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.
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CIRCUIT DIAGRAM
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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
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Zener diode.
Capacitors : 25v, 100 micro F & 25v, 220 micro F.
Resistors : 10k ohm.
LED’s
Diode IN4007.
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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 :
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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
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