Re: bad pole xmfrs

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

Original poster: Sean Taylor <sstaylor-at-uiuc.edu> 


>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

I asked a utility worker about this, and they told me that a distribution 
transformer is rated to run at double the nameplate rating for 24 hours, so 
for our purposes, a 10 kVA pig is basically a 20kVA transformer . . .

Sean Taylor
Urbana, IL