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50-AMP remote meter needed

Discussion in 'Electronic Basics' started by ltj, Nov 14, 2003.

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  1. Sorry, but this makes no sense at all. The maximal voltage a trafo's
    secondary can produce at a point in time is proportional to its number of
    turns times the first derivative of the primary's current. It is quite
    obvious that none of these factors can be infinite (apart from spikes when
    that thingie is switched on and off, but 2 zeners or this like will handle
    that). The assumption that 50A in the primary will (in this case) try to
    induce 50mA in the secondary is completely wrong. It will induce a limited
    maximal voltage (depends on the transformer, the limit may be higher than
    guessed, so take care) at zero current. It will go down a little with a
    substantial load, but a DMM will hardly make any change (at least not in the
    range it can measure). The 50 mA you mentioned will be there if (and only
    if) the secondary is shorted, it will be the maximal current ever reachable
    in the secondary with this setup at zero V out. You can easily test it by
    connecting any trafo with a very small number of turns on the primary in
    series to a lightbulb and checking the secondary's voltage. It will never
    exceed a certain limit that is proportional to the primary's current
    (Warning: This limit may be high!).

    Dimitrij
     
  2. ltj

    ltj Guest

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