Auto Selection of any Available Phase, in 3 Phase Supply System - PowerPoint PPT Presentation

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Auto Selection of any Available Phase, in 3 Phase Supply System

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The basic idea for the development of the project is to provide supply to the single phase load if any of the phases, out of the 3 phases misses. – PowerPoint PPT presentation

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Title: Auto Selection of any Available Phase, in 3 Phase Supply System


1
Auto Selection of any Available Phase, in 3 Phase
Supply System
2
Auto Selection of any Available Phase, in 3 Phase
Supply System
  • Introduction
  • The basic idea for the development of the project
    is to provide supply to the single phase load if
    any of the phases, out of the 3 phases misses.
  • The three transformers are connected to the 3
    phases supply. It automatically switch to next
    phase while one phase is misses.
  • For monitoring the phase shifting we are using
    NAND gate logics.
  • The relay driver IC to change the load to the
    next phase through the contacts those are fed
    from all the three phases.
  • At final condition it works on inverter.


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3
Auto Selection of any Available Phase, in 3 Phase
Supply System
  • Working
  • Three phase supply are given to three independent
    transformers connected in together with another
    transformers from receiving supply, an inverter.
  • The secondary of the transformers are used to
    develop DC by half wave rectification and then
    deriving four number of opto isolators
    individually.
  • The DC supply from all the three phases and
    inverter supply are combined and then fed to the
    regulator IC 7805 for the circuit operation
    power.
  • The relays connected drive the load with
    interlocking logic from the NO/NC contact such
    that the 1st phase load automatically changes
    over to any available phase in the event


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4
Auto Selection of any Available Phase, in 3 Phase
Supply System
  • Description of power supply
  • The basic idea for the development of the project
    is to provide supply to the single phase load if
    any of the phases, out of the 3 phases misses.
  • The three transformers are connected to the 3
    phases supply.
  • It automatically switch to next phase while one
    phase is misses.
  • For monitoring the phase shifting we are using
    NAND gate logics.
  • The relay driver IC to change the load to the
    next phase through the contacts those are fed
    from all the three phases.
  • At final condition it works on inverter.


http//www.edgefxkits.com/
5
Auto Selection of any Available Phase, in 3 Phase
Supply System

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6
Auto Selection of any Available Phase, in 3 Phase
Supply System
  • Hardware Requirements
  • Transformers
  • Logic Gates
  • Resistors
  • Capacitors
  • Relay Driver
  • Relays
  • Lamp
  • Diodes


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7
Auto Selection of any Available Phase, in 3 Phase
Supply System
  • And Gate description
  • The 4000 Series CMOS range, and contains four
    independent CMOS AND gates each with two inputs.
  • Pin Description
  • Pin 7 is the negative supply
  • Pin 14 is the positive supply
  • Pins 12, 56, 89, 1213 are gate inputs
  • Pins 3, 4, 10, 11 are gate outputs


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8
Auto Selection of any Available Phase, in 3 Phase
Supply System
  • Relay
  • A relay is an electrically operated switch.
  • Current flowing through the coil of the relay
    creates a magnetic field which attracts a lever
    and changes the switch contacts.
  • The coil current can be on or off so relays have
    two switch positions and have double throw
    (changeover) switch contacts as shown in the
    diagram.


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9
Auto Selection of any Available Phase, in 3 Phase
Supply System
Resistor
Capacitors

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10
Auto Selection of any Available Phase, in 3 Phase
Supply System
  • Relay driver
  • The ULN2003 is a monolithic high voltage and high
    current Darlington transistor arrays.
  • It consists of seven NPN Darlington pairs that
    features high-voltage outputs with common-cathode
    clamp diode for switching inductive loads.
  • The ULN functions as an inverter.
  • If the logic at input 1B is high then the output
    at its corresponding pin 1C will be low.


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11
Auto Selection of any Available Phase, in 3 Phase
Supply System
  • Applications
  • In this work, an automatic three phase changer
    comparator has been designed, built and tested.
  • The system operates smoothly as expected. It is
    reliable, durable and portable. The cost involved
    in developing it, makes it much more affordable
    than comparable product.


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12
Auto Selection of any Available Phase, in 3 Phase
Supply System
  • Conclusion
  • Further the project can be enhanced by
    incorporating power semiconductor devices such as
    thyristors/IGBTs for instantaneous changeover to
    the next available phase.
  • This overcomes the drawback of the changeover
    time generally witnessed by relay switching
    operations.


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