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[AMPS] Transformer Current ratings

To: <amps@contesting.com>
Subject: [AMPS] Transformer Current ratings
From: 2@vc.net (2)
Date: Mon, 17 Dec 2001 11:52:12 -0800
>
>Rich says:
>
>>The total equivalent series R [ESR] is a determinant in such calculations. 
>
>???????????
>
>What I'm suggesting is that a transformer can be checked for temperature 
>rise at
>a given current by doing the short circuit test. This heats the windings 
>because
>of the copper loss (i.e. heat generated by the current in the winding 
>resistance
>of primary and secondary). If the transformer is also saturating and 
>producing core heat becasue of this, it will add to the heating. The values 
of hot and
>cold resistance of any one winding will give a measure of the temperature 
>of the windings at that current drain, from which a decision can be made as 
to 
>whether or not this is acceptable.
>
>So you need to know Rcold and Rhot for any one winding. Not the total ESR or
>anything else.
>
//  Measuring one winding is nary enough.  

>What you may wish to do, having got a winding temperature under your rated 
>load current and duty cycle, ...
> ...
//  What if said transformer is to be used for voice SSB?

-  R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.  
end


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