Guys
As a change from whimsical vermin control discussions, I have a different
question. A few weeks ago - and around a year ago - there were threads asking
all about use of 3 phase transformers on single phase. Did we ever reach a
reasoned conclusion? This question has banged around in my head and like the
proverbial terrier (oops nearly onto rats and snakes again) I don't like to
give up....
An RF/power engineer I know in Bradford (Paul Whitely of bowler hat and
pinstriped suit at the Friedrichshafen fleamarket fame) told me that - assuming
a delta primary and star secondary - that I'd get (input voltage / design
voltage) times (root 3). Again the assumption is that I wire two primaries in
parallel and take two secondaries in series. This is from memeory so I could
have got it wrong. So: a 380v 3P input with a 5kv 3P output run this way on a
1P 230v input would give me: (230 / 380) * 1.73 = about 5.2kv. RIGHT OR WRONG?
Does anyone have a rigorous calculation to prove this along with the reasoning
behind it? I'm just curious. When I first asked the question of the group, I
thought I may be able to scrounge an old pole pig transformer off the local
power company. Sadly bureaucracy, SAP (the same thing really) and the dreaded
'Elf 'n' Safety seem to have taken over and I doubt that one will come my way.
Also, what's the likely current handling capacity compared to spec? Does
anyone have G3RZP's email address? I bet he'd know.
cheers
Dave G0OIL
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