Re: Pig Question AND current limiting method

[LTM-at-SUBSONIC-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Your question   "And what is the 'up-to-date' current limiting method? arc
welders and 
resistive ballast (oven elements)?"  
   I used rebar tie wire (could use baling wire also) pulled it taught for
straight pieces, cut it to the desired length, also cut a piece slightly over
twice the others length to bend in half to fashion a loop for pulling purpose,
and coated them with varnish. Note: Each piece is individually coated. After
adequate drying time, placed all coated rods in a PVC pipe for tight bundling
and forced all rods out at the same time so they could be taped as a bundle.
One could also keep these rods in a non metallic pipe and fill with resin. 
   I wound a 8 Awg bare copper wire around the full length of the bundle making
sure it wasn't too tight, enough for the core bundle to freely slide within the
coil. I coated the coil with  polyester resin AKA fiberglass resin for a tough
surface. 
   The way this works, when the core is in the coil, the core saturates and
limits the current. Pull the core slowly out of the coil, and the current
rises. 
   It was easy to locate the supplies, and rewarding to make. Also it's
infinitely variable.
Hope this helps for part of your questions.
   
      Shawn T. Ferrell
            COIL ON



At 10:01 PM 08/01/2000 -0600, you wrote:
>
> Original poster: "Dan Kunkel" <dankunkel-at-hotmail-dot-com> 
>
> Coilers,
>
> I went to the power company today to see if I could procure for myself a 
> pole pig. The company only runs 7,620 volt lines and there 10 kva-ish 
> transformers are all single bushing. I was wondering if anyone esle has had 
> experience with these kind of transformers. They are upgrading their load 
> capabilities are getting rid of the smaller trannies at scrap cost 
> (awesome).
>
> I was wondering if it is possible/nessecary to buy two trannies and wire 
> them in series to produce 15,240 volts in order to reduce amperage and still 
> keep the wattage the same. I would want to reduce the amperage so i don't 
> have nightmarish spark gap quench problems.
>
> Also when wiring the these transformers in series, do you just connect the 
> ground (the case) together and draw the HV off each bushing?
>
> And what is the 'up-to-date' current limiting method? arc welders and 
> resistive ballast (oven elements)?
>
> thanks
>
> Dan
> ________________________________________________________________________
> Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail-dot-com