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From: John Woodgate
Subject: Re: Strange failure mode in switchmode power supplies: Followup
Date: Sun, 22 Sep 2002 01:26:54 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Sun, 22 Sep 2002 05:52:06 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Tony Williams
wrote (in <email@example.com.
uk>) about 'Strange failure mode in switchmode power supplies:
Followup', on Sun, 22 Sep 2002:
>In article ,
> red rover wrote:
>> I thought the UK homes
>> were fed by coax power feeds. I'm not sure I follow
>> your description. Is this transformer a Delta-Y transformer?
>> Is there an online diagram?
> There is a 3-wire overhead hv supply (11KV?)
> coming up the valley to this village, feeding
> a number of 3-phase transformers. The primaries
> are delta-wired, and the 3-phase secondaries
> are star-connected, 230V Line-Neutral, 400V
> Line-Line. Each house is fed with just one
> of those 230V Line-Neutral phases.... the other
> phases going to other houses. In urban areas
> the transformers will be large enough to feed
> a number of houses off each Line-Neutral phase.
> Only high power consumers (factories/farms) are
> fed with all three phases, and they are generally
> required to keep the loading approximately balanced.
The service cables are coaxial in later installations but there are many
indeed that are not: 2 cores and the armour is the supplier's
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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