circuit interruptor

Discussion in 'The Projects Forum' started by hazelle, Feb 20, 2011.

  1. hazelle

    Thread Starter New Member

    Feb 19, 2011
    2
    0
    i have a project in microprocessor about circuit interrupters, which the main switch will automatically trip to off when it can detect an electrocuted person or leakages. Do you have any suggestion on how we will connect the ammeter to our 220V supply from the outlet? i really need suggestions... please... :(
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    Google: ground fault circuit interrupter

    Ken
     
  3. Adjuster

    Well-Known Member

    Dec 26, 2010
    2,147
    300
    You may also want to look up "residual current device". The terminology used to describe these devices varies between different regions of the world.

    Most commonly, leakage is detected in terms of an imbalance in the circuit conductor currents, rather than by sensing current in the protective ground. This technique allows leakage to be detected even if it returns (for instance) to a damp floor rather than to the mains ground.
     
  4. hazelle

    Thread Starter New Member

    Feb 19, 2011
    2
    0
    actually, our project is quite complicated... we are planning to make a circuit breaker, using a PIC, where when a person is electrocuted, the breaker would automatically trip off... we need idea on how to use the PIC without converting AC to DC... and how would the PIC read the 220V source from the outlet...

    anyway, i am from the Philippines, and GFCI is not available here
     
  5. Dyslexicbloke

    Active Member

    Sep 4, 2010
    420
    19
    Based on your question I would respectfully suggest you import one, a GFCI that is before going anywhere any power ......
    Google 'Current transformerr' RE sensing and dont even think of supplying the uP witout using an isolation transformer.

    Sorry to be blunt but this project could kill you if you go about it the wrong way.
    It may also kill someone else if it dosnt work as intended and isnt fail safe.
    My advice ..... DONT GO THERE unless its purly accademic research.
    Al
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Use a current transformer, but what is the utility of metering current? Or of metering without conversion to DC?

    Can you state how you intend to detect a possible electrocution?
     
  7. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    What's the point? If a person is "electrocuted" he or she is dead! If you meant to say "Detect when a person is receiving an electric shock", how will your circuit know the difference between current flow through a human vs a legitimate load?

    FYI, GFIs don't protect humans from electric shock received between the 'Hot' and 'Neutral' (also called the 'Return').
     
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