Automatic phase changer

2,1393,802

Project kit PriceQuantity
Professional 2,139
Assembled 2,733
Combo 3,445
Learning 3,802

Description

Abstract:

In three-phase applications, if low voltage is available in any one or two phases, and you want your equipment to work on normal voltage, this circuit will solve your problem. However, a proper-rating fuse needs to be used in the input lines (R, Y and B) of each phase. The circuit provides correct voltage in the same power supply lines through relays from the other phase where correct voltage is available. Using it you can operate all your equipment even when correct voltage Is available on a single phase in the building. The circuit is built around a transformer, comparator, transistor and relay. Three identical sets of this circuit,

one each for three phases, are used. Let us now consider the working of

the circuit connecting red cable (call it ‘R’ phase).The mains power supply phase R is stepped down by transformer X1 to deliver 12V, 300 MA, which is rectified

By diode D1 and filtered by capacitor C1 to produce the operating

Voltage for the operational amplifier (IC1). The voltage at inverting pin 2 of

operational amplifier IC1 is taken from the voltage divider circuit of resistor

R1 and preset resistor VR1. VR1 is used to set the reference voltage according

to the requirement. The reference voltage at non-inverting pin 3 is fixed to

5.1V through zaner diode ZD1. Till the supply voltage available in

phase R is in the range of 200V-230V, the voltage at inverting pin 2 of IC1

remains high, i.e., more than reference voltage of 5.1V, and its output pin 6

also remains high. As a result, transistor T1 does not conduct, relay RL1 remains

De-energized and phase ‘R’ supplies power to load L1 via normally closed

(N/C) contact of relay RL1.  As soon as phase-R voltage goes below 200V, the voltage at inverting pin 2 of IC1 goes below reference voltage

of 5.1V, and its output goes low. As a result, transistor T1 conducts and

Relay RL1 Energizes and load L1 is disconnected from phase ‘R’ and

connected to phase ‘Y’ through relay RL2. Similarly, the auto phase-change of

the remaining two phases, vise, phase ‘Y’ and phase ‘B,’ can be explained.

Switch S1 is mains power ‘on’/’off’ switch . Use relay contacts of proper rating

and fuses should be able to take-on the load when transferred from other

phases. While wiring, assembly and installation of the circuit, make sure that

you:

1.     Use good-quality, multi-strand insulated copper wire suitable for your

current requirement.

2. Use good-quality relays with proper contact and current rating.

3. Mount the transformer(s) and relays-on a suitable cabinet. Use a Tag

Block (TB) for incoming/outgoing current requirement.

2. If the input voltage is low in two phases, loads L1 and L2 may also be

connected to the third phase. In that situation, a high-rating fuse will be required

at the input of the third phase which is taking the total load.

Additional information

Weight 1 kg
Project kit

Professional, Assembled, Combo, Learning

Component list

 

Basic HTML Table

Component Name Value Quantity
Transformer 12-0-12/500ma 3
Resistance 10k 3
Resistance 3.3k 6
Transistor Bc557 3
Zenerdiode 5.1v 3
Diode 1N4007 9
Zinerdiode 5.1v 3
Relay 12v 3
Capacitor 1000/35v 3
Capacitor 470/35v 3
Potentiometer 10k 3
Switch on/off 3
Lamp 15w 3
Holder —— 3
PCB 6×4 inch Copper 3

 

7 reviews for Automatic phase changer

  1. FISEL

    We REQUIRED AN PCP BOARD FOR AUTOMATIC PHASE CHANGER.PLEASE CONFIRMRD WHETHER YOU CAN SUPPLY THE REQUIRED ITEAM.

    THANKS & REGARDS,
    FISEL
    9941924431

    • Author

      yes we can send you required items which you need

  2. accepremy

    Ignorance is never out of style. It was in fashion yesterday, it is the rage today and it will set the pace tomorrow.

  3. automatic phase changer

    we want to buy this projct,and also want theory about this projet…we are from greater noida.

    • Author

      my contact no is 09828379647 call me

  4. google

    I liked your article is an interesting technology
    thanks to google I found you

  5. vivek soni

    I want to buy this project with its all available report and if possible ppt too.But how should i contact u…
    Plz sir give us reply as soon as possible..!

  6. Ernest

    I want to know the difference between Automatic phase changer and automatic phase control if there is any.

    • IQBAL SINGH

      Automatic 3 phase controller has some advance functions. It also control frequency and voltage along with phase changing.

  7. Nitesh gupta

    We REQUIRED AN PCP BOARD FOR AUTOMATIC PHASE CHANGER.PLEASE CONFIRMRD WHETHER YOU CAN SUPPLY THE REQUIRED ITEAM.

    THANKS & REGARDS,

    • IQBAL SINGH

      yes
      you can contact us for detail at
      M0bile: +91 8955512356
      +91 9829379647

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