Re: potential transformers

> Anybody know what these (potential transformers) are normally used 
> for and where one might be able to obtain one and how much.

As it was explained to me, potential transformers are used to monitor 
line conditions and power things at substations, as opposed to the pole 
transformers which are used to distribute the current to the masses.  

As to where you can get them, that's a good question.  R. Hull got his 
from their Richmond salvage yard (about $5 each for his two 8kV, 3kVA 
series-connected puppies he was using to power his magnifier in 
October), and I would imagine that you could probably obtain them from 
the same place you would get your pole transformers from (this is pure 
conjecture, I haven't been able to find a local source for either on my 
own).  At the TCBOR Teslathon, Richard Hull was selling 250 pound 
35kV, 3kVA potential transformers for $35 (also collected from the 
Richmond salvage yard), so I would think that if you could find a local 
surplus source, the price could fall in the $0 to $50 range for the lower 
voltage transformers.

Steven Roys (sroys-at-radiology.ab.umd.edu)