Re: bad pole xmfrs

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

Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net> 

Not surprising at all..
my house has a 200A service (=48 kVA) and there are, I think, 8 houses fed
from a 50 kVA transformer.
Peak vs average is the thing...
I doubt that I ever draw 200A, except in a fault condition.
The big load is the A/C compressor starting, which is probably 40-50A for a
few seconds.
Electric oven is probably in the 20A range, which is also the run current
for the A/C.

Figure my worst case is probably around 40A (= 10 kVA), so if everyone does
the same thing at the same time (unlikely), we might hit 80 odd kVA, which
is not a huge overload.

There IS a noticeable light blink when my neighbors' a/c starts, but the SCE
engineer says that's primary impedance (MV distribution) not the
transformer.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, April 10, 2004 4:38 PM
Subject: Re: bad pole xmfrs


 > Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
 >
 > On pig over loading, heres something to keep in mind, the 37.5 KVA pig I
am
 > feed of off serves 4 houses. 200 amp service to each houses equals 192
KVA.
 > Is it just me, or does that seem a little weird?
 >
 > ---Eric
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Saturday, April 10, 2004 12:44 PM
 > Subject: Re: bad pole xmfrs
 >
 >
 >  > Original poster: Yurtle Turtle <yurtle_t-at-yahoo-dot-com>
 >  >
 >  > We actually had to "rescue" the poor thing with a
 >  > chainsaw and a handtruck. You might remember me asking
 >  > the list for ideas on how to lower it from the pole.
 >  > We finally just cut it down. After rolling it
 >  > cross-country, we pulled it into the truck with only 2
 >  > 2x12's and the handtruck. The guy really earned his
 >  > pentium 200!
 >  >
 >  > Actually, unloading it was a breeze! I simply slid it
 >  > down the 2x12's without the handtruck. The only hard
 >  > part was keeping the weight evenly distributed on the
 >  > two 2x12's.
 >  >
 >  > I have no idea what it weighs, but since it has
 >  > aluminum windings, that may reduce it a pound or two.
 >  >
 >  > The picture you probably saw with "25" was after I
 >  > repainted it and used Home Depot stickers. Here's the
 >  > "before" picture. I like the "25+":
 >  >
 >  > http://www.hot-streamer-dot-com/adam/garage/pig_14.4kV_25kVA_1.jpg
 >  >
 >  > Adam
 >  >
 >  > --- Tesla list <tesla-at-pupman-dot-com> wrote:
 >  >  > Original poster: DRIEBEN-at-midsouth.rr-dot-com
 >  >  >
 >  >  > Hi Adam, all,
 >  >  >
 >  >  > Nice find! I recall seeing pics of this pig on your
 >  >  > webpage and it
 >  >  > was clearly marked "25" on the front. I'll bet it
 >  >  > was a real challenge
 >  >  > for two people to load a 25 kVA pig (which I suppose
 >  >  > would have to
 >  >  > weigh in at 400 to 450 lbs minimum) into the back of
 >  >  > a pickup, un-
 >  >  > less you had access to an overhead hoist or a fork
 >  >  > lift to assist
 >  >  > in your lifting efforts. And UNLOADING it would be
 >  >  > an even bigger
 >  >  > challenge w/out mechanical assitance :^O.
 >  >  >
 >  >  > I'd have to agree with you 100% on the pig vs NST
 >  >  > farm issue. Even
 >  >  > with a huge NST farm that supposedly adds up to the
 >  >  > same kVA rating
 >  >  > as a single pig, the pig powered coil always seems
 >  >  > to outperform the
 >  >  > NST driven coil, espcially in the catagory of
 >  >  > streamer brightness!
 >  >  > And a pole pig dosen't even "break a sweat" running
 >  >  > a coil at or even
 >  >  > significantly above its nameplate rating. It seems
 >  >  > like I was told
 >  >  > that the utility power companies don't even consider
 >  >  > upgrading a
 >  >  > pole transformer to a larger unit unless the demand
 >  >  > on it consistant-
 >  >  > ly exceeds its rating by a factor of 80% (18 kVA
 >  >  > draw from a 10 kVA
 >  >  > pig). Someone correct me on that if I'm wrong on
 >  >  > that, but I do know
 >  >  > that a pig can be ran at 2 or even 3 times its
 >  >  > nameplate kVA rating
 >  >  > running a Tesla coil for short runs (<5 minutes -
 >  >  > not too many of
 >  >  > us are gonna run a coil for longer time intervals
 >  >  > than that, anyway).
 >  >  >
 >  >  > David Rieben
 >  >  >
 >  >
 >  >
 >  >
 >
 >