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Re: [Amps] questions on my tranformer test

Subject: Re: [Amps] questions on my tranformer test
From: "Will Matney" <>
Date: Mon, 13 Jun 2005 23:03:41 -0500
List-post: <>
Ken, the watt rating can be determined by the core size and then the current 
found from that. But, that dont hold true if they didn't wind the coil with the 
right size wire for its duty cycle. The only way you can tell for sure is find 
the wire size used in the coil. If you knew what the wire insulation was, so to 
know its temperature rating, you could snake a  thermostat wire down in the 
center of the winding and run it under load to see what the coils innards are 
heating to. Or do the hope-so test and see how hot the core and coil gets by 
touch which isn't accurate. If its right for the load, the core and coil should 
just be warm to the touch, and not close to hot enough as you couldn't keep 
your hand on it. 180 degrees is way too hot for any to run. Something in the 
order of 100 degrees to maybe 110 is about maximum for one in open air.



----- Original Message -----
From: kenw2dtc <>
Subject: [Amps] questions on my tranformer test
Date: Sun, 12 Jun 2005 14:39:52 -0400

> Hi,
> I'm trying to figure out the current rating of a plate transformer.  This is
> my test setup:
> Questions:
> 1.  Is this a valid way to find the secondary current capability?
> 2.  Is the internal temperature of 180 degrees F too high for a transformer
> under load for 5 hours?
> 3.  Is there a problem running this center tapped beast in a full wave
> capacitive input configuration?
> Thanks and 73,
> Ken W2DTC
> _______________________________________________
> Amps mailing list

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