RE: Getting more input power

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Dave Halliday" <dh-at-synthstuff-dot-com> 

Considering that the power that comes into your house is 200 Amp single
phase, there should not be any reason why you could not get a second
drop or extend a 50-amp line from your primary breaker box.

The electrician probably doesn't realize that you are wanting to run
large transformers, they are probably thinking "workshop=power tools"
and thinking that you want to run large motors - in this case, 3-phase
is the way to go for size and efficiency reasons.

 > -----Original Message-----
 > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 > Sent: Friday, January 02, 2004 7:57 PM
 > To: tesla-at-pupman-dot-com
 > Subject: Getting more input power
 >
 >
 > Original poster: "Ian McLean" <ianmm-at-optusnet-dot-com.au>
 >
 > Hi all,
 >
 > I have been talking to my electrician about getting a 50A
 > feed into my workshop. He has informed me that this is
 > usually done with a 3-phase connection.  I should have
 > pressed him for some more questions, but forgot, so I'll ask
 > the knowledgeable people on this list.
 >
 > My knowledge of 3-phase power is sketchy, whilst I do
 > understand the basics.
 >
 > If the outlet is rated at 50A 3-ph, then how much power is
 > available per phase (to neutral) ?
 >
 > If it is 1/3 of 50A that is OK, I could split the power - use
 > one phase for the HV supply, and another for the RSG - but
 > this raises a major issue.  The RSG will be out of phase with
 > the HV supply by 120 or 240 degrees depending on which two
 > phases I use.  Is there any way of adjusting this with some
 > sort of phase angle adjustment.  The JF phase adjuster can
 > only manage about 90 degrees or so I believe.
 >
 > I wonder how my NST's would cope if I connected them between
 > phases ?  This way they would be getting 415VAC, not 240VAC -
 > and I wonder if the insulation in the tranformers could cope
 > with the higher voltage.  Anyone tried this ?  My guess is ..
 > no way .. we would be upping a 15kV tranformer to nearly
 > 30kV, and we all know this is about the dialectric strength
 > of air, and the first real problem point for insulation
 > breakdown and corona.
 >
 > Rgs
 > Ian
 >
 >
 >
 >