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From: "Phil Allison"
References: <email@example.com> <firstname.lastname@example.org> <8e+6RgBNico9EwL3@jmwa.demon.co.uk> <email@example.com> <firstname.lastname@example.org>
Subject: Re: Doubling wallwart power rating
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Wed, 9 Oct 2002 21:12:56 +1000
NNTP-Posting-Date: Wed, 09 Oct 2002 21:00:50 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Tony Williams" wrote in message
> In article ,
> Phil Allison wrote:
> > "Tony Williams" wrote in message
> > news:email@example.com...
> > > I do believe that this method of designing/using
> > > transformers is an attempt to get the no load
> > > iron losses near to the full load copper losses.
> > ** Seemsw to me the iron loss is small compared to copper loss.
> I used an RS 1KVA 240:120 autotransformer about
> 15 years ago. The surface temperature of the
> laminations was higher at No-load than at Full-load.
> About 55C to 60C, versus 45C to 55C.
** Hmmm, sounds like it was "engineered" for 60 Hz operation - very
The off load amps or VA must have been horrendous !!
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