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Re: [Amps] questions on my transformer test

To: <>, "Will Matney" <>
Subject: Re: [Amps] questions on my transformer test
From: "kenw2dtc" <>
Date: Tue, 14 Jun 2005 01:09:49 -0400
List-post: <>
I agree with you on measuring the wire size; however, upon investigation the
secondary terminals are fed with , thick flat copper bus which has much more
area then the actual secondary wires, so I'm not going to tear open the
beast to find the wires.   A couple of other gentlemen suggested that maybe
the transformer has a 2 amp rating, so for the heck of it I ran the test for
6 hours at 2.0 amps and the internal temperature was 144.   The first few 
did yield about 110 degrees as you suggested.


----- Original Message ----- 
From: "Will Matney" <>
To: <>
Sent: Tuesday, June 14, 2005 12:03 AM
Subject: Re: [Amps] questions on my tranformer test

> 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.
> Best,
> Will
> ----- Original Message -----
> From: kenw2dtc <>
> To:
> 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
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