Automatic Phase Changer (PowerPoint) by pawan2002

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									SUBMITTED BY:                                                              Guided by:
TASLIM AHAMAD (0913090128)                                           Mr. U.MATHUR
MOH. SALIM ANSARI (0913090115)                                  (Head of Department)

                Department of Electronics Engineering
                      Govt. Polytechnic, Shaktifarm
                       Camp Sitarganj, (U.S.Nagar)
                              Uttarakhand

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INDEX
   Introduction
   Component required
   Brief idea about component
   Circuit diagram
   Working
   Features
   Application
   Problem faces during circuit designing
   Testing
   Scope of the project
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INTRODUCTION
 In three phase application ,if low voltage available in
  any one or two phases, and we want our equipment to
  work on normal voltage, this circuit will solve our
  problem .

 The circuit provides correct voltage in the same power
  supply lines through relays from the other phase where
  correct voltage is available.
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COMPONENT REQUIRED
 Transformer (230v ac primary to 12-0-12, 500mA
    secondary transformer.)
   Comparator(IC741)
   Transistor (BC557)
   Relay (12v SPDT)
   Diode (IN4007)
   Zener diodes(5.1v)
   Fuses

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BRIEF IDEA ABOUT COMPONENTS
USED IN CIRCUIT
                 TRANSFORMER
 Transformer is an ac machine that.

 Transformer electrical energy from one electrical circuit to
    another .
 Does so without change of frequency.

 Does so by the principal of electromagnetic induction.

 It has electric cricuit which is linked by a common
    magnetic circuit
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               COMPARATOR
 In electronics , a comparator is a device that compares
 two voltages or currents and switches its outputs to
 indicate which is larger.

 It is used in Analog-to-Digital converter(ADCs ).




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                   TRANSISTOR
 A transistor is a semiconductor device use to amplify
  and switch electronic signals.

 It is made of a solid piece of semiconductor material,
  with at least three terminals for connection to an
  external circuit.

 A voltage or current applied to one pair of the
  transistor terminals changes the current following
  through another pair of terminals.
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                              RELAY
 A relay is an electrically operated switch.

 Relay are used where it is necessary to control a circuit
  by a low power signal (with complete electrical
  isolation between control and controlled circuit).




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                               DIODE
 It is a two terminal semiconductor(rectifying) device
  that exhibits a nonlinear current voltage
  characteristic.

 The function of a diode is to allow the current in one
  direction.



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                  ZENER DIODE
 A zener diode is a type of diode that permits current
 not only in the forward direction like a normal diode ,
 but also in the reverse direction if the voltage is larger
 than the breakdown voltage known as “Zener knee
 voltage “ or “Zener voltage”.




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                               FUSES
 In electronics and electrical engineering a fuse is a
  type of sacrificial over current protection device .



 A fuse interrupts excessive current(blow) so that
  further damage by overheating or fire is prevented



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              PRESET RESISTOR
 A preset is a three lagged electronic component which
  can be made to offer varying resistance in a circuit .

 The resistance is varied by adjusting the rotary control
  over it.

 The adjustment can be done by using a small screw
  driver or a similar tool.

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BLOCK DIAGRAM




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                      FEATURES
 Compact design.

 Easy to install.

 Low maintenance required.

 Rugged.

 Reliable.



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               APPLICATIONS
 Indoor & outdoor Application.

 In industries where continuous supply is needed.

 Factories.

 Commercial offices.

 In Bank/ATMs for voltages change over.



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SCOPE OF THE PROJECT
 This cricuit automatically changes the phase when one or two
  phases are lost in three phase supply .
 Therefore the cricuit is very useful in those industries ,factories ,
  home spaces and offices where continuous supply of electricity is
  needed.
 No need of human for change over the phase during phase loss
  in incoming 3-phase supply.
 Therefore increase production in through providing continuous
  supply.
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