RE: Getting more input power

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

Original poster: "Lau, Gary" <gary.lau-at-hp-dot-com> 

Applying more than about 140VAC to a 120V NST will only result in core
saturation, overheating, and tripped circuit breakers.  One simply
cannot increase the output voltage from an NST by applying more input
voltage.

Gary Lau
MA, USA

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, January 02, 2004 10:57 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