Typ secondary = 240V, 400Arms. 240 x 400 = 96kVA. Of course, in "our"
applications, that becomes the primary.
-WB2WIK/6
"Each success only buys an admission ticket to a more difficult problem." --
Henry Kissinger
> -----Original Message-----
> From: K7RDX [SMTP:k7rdx@earthlink.net]
> Sent: Thursday, December 20, 2001 4:43 PM
> To: Steve Katz; 'Phil (VA3UX)'; amps@contesting.com
> Subject: Re: [AMPS] HV Pole Pigs ++
>
> The "average" pole pig is a 96 kva unit? I thought my 3 kva (136 lbs) was
> average! Are you sure about your ratings or are you just burping a figure?
> Jim,K7RDX
> ----- Original Message -----
> From: Steve Katz <stevek@jmr.com>
> To: 'Phil (VA3UX)' <phil@vaxxine.com>; <amps@contesting.com>
> Sent: Thursday, December 20, 2001 4:13 PM
> Subject: RE: [AMPS] HV Pole Pigs ++
>
>
> >
> > I'm still trying to figure why hams (including me, in my younger and
> > stupider days) feel the need to use a 96 kVA transformer to power an
> amateur
> > amplifier. Even tubes with really big handles don't need a 96 kVA
> source,
> > but that's what the average pole pig is.
> >
> > -WB2WIK/6
> >
> > "Each success only buys an admission ticket to a more difficult
> problem." --
> > Henry Kissinger
> >
> > > -----Original Message-----
> > > From: Phil (VA3UX) [SMTP:phil@vaxxine.com]
> > > Sent: Thursday, December 20, 2001 2:54 PM
> > > To: amps@contesting.com
> > > Subject: Re: [AMPS] HV Pole Pigs ++
> > >
> > >
> > > Not a bad point Jack. Ultimately most of the pigs are removed from
> the
> > > can
> > > when used for amateur service. I don't know about the standards in the
> US
> > > but here in Canada, these pole transformers had to have enough sheet
> > > insulation between winding layers to meet the electrical requirements
> > > *before* they were put in oil. The oil then just added a huge
> additional
> > > insulation factor as well as providing the required cooling. This came
> > > from
> > > a conversation I had with a design engineer at Ferranti-Packard (at
> one
> > > time, one of the largest makers of pole transformers in Canada). So at
> > > least in Canada, these things can be safely run dry. However the
> sheet
> > > insulation is still subject to the same time/temperature/aging effects
> as
> > > any other transformer so eventual failure is expected.
> > >
> > > Phil
> > >
> > > At 12:50 PM 12/20/2001 -0500, you wrote:
> > >
> > > >One thing to remember..........the oil that these transformers
> normally
> > > >operate in is not just for cooling, it is for insulation!
> > > >The oil has good dielectric properties. I used a pole pig for some
> time
> > > and
> > > >it ultimately failed after it arced internally to the core. I had
> > > removed
> > > >it from the can and allowed the oil to drain off. Probably a good
> idea
> > > to
> > > >leave the transformer in the can and keep it in oil to avoid such
> > > problems.
> > > >Unfortunately, that makes for a rather large unit!
> > > >73,
> > > >Jack, W9GT
> > > >----- Original Message -----
> > > >From: "Geo Clute W7LFD" <gclute@attbi.com>
> > > >To: <amps@contesting.com>
> > > >Sent: Thursday, December 20, 2001 12:39 PM
> > > >Subject: RE: [AMPS] HV Pole Pigs ++
> > > >
> > > >
> > > > >
> > > > >
> > > > > I like the concept of "Dial-A-Voltage". Variac and pole peg
> mounted
> > > > > in a 4 wheeled photo copier cabinet. Oh yes...an Edsel steering
> wheel
> > > > > on the Variac.
> > > > >
> > > > > Still looking for the Edsel.
> > > > >
> > > > > Geo W7LFD
> > > > >
> > > > >
> > > > > --
> > > > > FAQ on WWW: http://www.contesting.com/FAQ/amps
> > > > > Submissions: amps@contesting.com
> > > > > Administrative requests: amps-REQUEST@contesting.com
> > > > > Problems: owner-amps@contesting.com
> > > > >
> > > >
> > > >
> > > >--
> > > >FAQ on WWW: http://www.contesting.com/FAQ/amps
> > > >Submissions: amps@contesting.com
> > > >Administrative requests: amps-REQUEST@contesting.com
> > > >Problems: owner-amps@contesting.com
> > >
> > >
> > >
> > > --
> > > FAQ on WWW: http://www.contesting.com/FAQ/amps
> > > Submissions: amps@contesting.com
> > > Administrative requests: amps-REQUEST@contesting.com
> > > Problems: owner-amps@contesting.com
> >
> > --
> > FAQ on WWW: http://www.contesting.com/FAQ/amps
> > Submissions: amps@contesting.com
> > Administrative requests: amps-REQUEST@contesting.com
> > Problems: owner-amps@contesting.com
> >
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