RE: Using 240VAC on 140VAC Varic

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

Original poster: "Mccauley, Daniel H" <daniel.h.mccauley-at-lmco-dot-com> 

Actually, from what it appears, my 0-240VAC (280VAC) 3-phase variac is
only rated for 0-140VAC per single
unit.  I think its wired in such a way that you can use 0-240VAC 3-phase
on the entire stack, but each single
variac only sees the phase-to-phase voltage, as opposed to phase to
neutral.

Make any sense???

Dan






thats strange, i bought one of them,
480v input, 0-560v out 9.8Amp rating
on the spec plate.
same current draw specs as yours on 240v
but at 320ma i left it on for a while and there
was no percievable temperature rise in the core
and i was able to get 272v at the ouput.
at 0-140v your's must be different to mine.
i thought the batch he got were all the same.

regards
richard
aus.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, February 10, 2004 11:48 AM
Subject: RE: Using 240VAC on 140VAC Varic


  > Original poster: "Ian McLean" <ianmm-at-optusnet-dot-com.au>
  >
  > Hi Dan,
  >
  > Yes.  I bought a variac from Oatley Electronics here in Australia
that came  > from the U.S.  It was rated for 0-140AC.  It was part of a
3 phase stack.  > It workes fine up to 2kVA on 240VAC, as long as you do
not try and use the  > step-up winding.  If you wire it without the
step-up, the variac draws about  > 30mA without load, which is fine -
but if you try and use the step-up  > winding, the variac draws about
320mA, so I suspect the core is saturating.  >  > PS: The variac only
cost me Aus$40 ;)  >  > Rgs  > Ian.  >  >  > -----Original Message-----
 >  > From: Tesla list [mailto:tesla-at-pupman-dot-com]  >  > Sent: Tuesday, 10
February 2004 2:03 am  >  > To: tesla-at-pupman-dot-com  >  > Subject: Using
240VAC on 140VAC Varic  >  >  >  >  >  > Original poster: "Mccauley,
Daniel H" <daniel.h.mccauley-at-lmco-dot-com>  >  >  >  > Has anyone tried
running 240VAC on a variac rated for 0-140VAC ?  >  > I know there are
issues, but just curious if anyone actually tried it.  >  >  >  > Thanks
 >  > Dan  >  >  >  >  >  >  >