Re: Getting more input power

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

Original poster: "Richard Modistach" <hambone-at-dodo-dot-com.au> 

hi ian,

the 50 amp 3 phase supply equals :-
50 amps between each leg of any two phases at 415v,
50 amps from any leg to neutral at 240v.
you will have a total of 150 amps at 240 volts at your disposal,
a correct pfc on one line should align any two phases correctly
if required,
in the case of running a 3 phase motor off single phase power
a pfc is used to misalign the phases correctly. however i think
from memory an inductance is used as well to achieve better
than 90 degree correction.
but by the looks the 50A off one leg at 240 v is going to meet your
requirements without phase combining and alignment.

regards
richard
aus.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, January 03, 2004 2:26 PM
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
 >
 >
 >