over voltage protection help

Discussion in 'The Projects Forum' started by hanibal517, May 18, 2009.

  1. hanibal517

    Thread Starter New Member

    May 23, 2008
    1
    0
    hi, i am a student of diploma, currently donig a project on how to protect instrument from overvoltage ...
    i am currently using an isolating transformer 400/230V 400Va
    but each time i switch on the power i noticed that the secondary voltage is 240V, how can i correct this ?
     
  2. heavyarms666

    Member

    May 16, 2009
    20
    0
    its maybe the current rating, do you checked it?
     
  3. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    If you have the primary connected between two phases then you will have 240V on the secondary because the voltage between two phases is 415V and not 400V.
     
  4. DonQ

    Active Member

    May 6, 2009
    320
    11
    Yeah, your only options are to either change your input voltage, or change your transformer.

    Some transformers, maybe not a small one like you are using, have different taps available on the windings to allow adjustments for slightly different input voltages.
     
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