AC ammeter circuit

Discussion in 'The Projects Forum' started by ninjamafiakhan, May 23, 2009.

  1. ninjamafiakhan

    Thread Starter New Member

    May 8, 2009
    5
    0
    Hi!
    I need a circuit design for measuring one of the AC line currents of a three phase system. The circuit MUST have the following charecteristics:

    1. Must have a series electrical connection with the line. Not something like a magnetic field sensor etc.

    2. Must provide a voltage output proportional to the current flowing through it. I need it to measure accurately upto 0.7-0.8 Amps.

    3. Must not be a simple resistive circuit, as there are power and loading issues etc.

    Please help. Thanks in advance.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Have you done any research? What, besides a resistor in series with the line, will satisfy condition #2? How do you expect to get around condition #3?
     
  3. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    Since (1) is verboten then (3) is your only option. Just make R as small as you can. After all, that's what a Shunt does.
     
  4. Regected

    Active Member

    May 24, 2009
    30
    0
    How about a one or two loop inductor and a hall effect sensor? The stronger the magnetic field, the more the current is present.
     
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