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Re: Power Transformer

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  • dirt939
    Thanks for your help. I had it hooked up wrong. I had the mains hooked up to the secondaries. And, since the secondaries were very low resistance it was
    Message 1 of 4 , Nov 29, 2002
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      Thanks for your help.

      I had it hooked up wrong. I had the mains hooked up to the
      secondaries. And, since the secondaries were very low resistance it
      was throwing my breaker everytime. It works great now. I read 26
      volts AC on my multimeter. Perfect.

      Your explaination of transformers helped.

      --- In Electronics_101@y..., "manifold" <manifold_1@y...> wrote:
      > You can always use an Ohm meter to check the DC resistance of the
      > windings. That will tell you quite a bit about the transformer. I
      > have successfully determined coil arrangements in transformers with
      > just an ohm meter so it can't be that hard.
      >
      > o How do you know that the transformer is 110VAC to 24VAC? Is it
      > stamped on the transformer somewhere?
      >
      > Once you know for sure what it is supposed to do, you can determine
      > how it does it. Check the leads and measure the resistance.
      > Generally, the high resistance leads will be the primary winding of
      a
      > step down transformer. And yes you are right, the higher voltage,
      > lower current primary wires should be of a smaller guage than the
      > high current low voltage secondary wires.
      >
      > Other arrangements of the primary winding can cause confusion. Some
      > transformers have a split primary so that it can be operated at
      120V
      > or 240V. Some secondaries may be split windings or center tapped.
      >
      > If the breaker opened, then there is a definitly a problem. A short
      > in either the primary or the secondary could cause the breaker to
      > open even if you did get it wired correctly.
      >
      >
      >
      > --- In Electronics_101@y..., "dirt939" <dirt@d...> wrote:
      > > I got a new transformer the other day from a surplus supplier,
      > > Electronics Goldmine. I do not have any specs on it, but I do
      know
      > > it is 110 Volts (1.1 Amps) on the primary and 24 Volts (4.5 Amps)
      > on
      > > the secondary at 50% Duty. I tried hooking it up the other day
      and
      > > it immediately threw my breaker switch. So, I have a couple of
      > > questions.
      > >
      > > Without specs, how can I know which leads are the primaries and
      > which
      > > ones are the secondaries? I assume the leads attached to the
      lower
      > > gauge wire is the primary.
      > >
      > > Is there any way to test this transformer to see if it is bad?
      > >
      > > Any suggestions would be greatly appreciated.
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