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Re: buying a pole pig

Original poster: Don Murray <don@xxxxxxxxxxxxxxx>

Justin,
What the Y means is that if you are going to connect that transformer to a 12470 volt system you must connect it Y. Each end of that Y is one phase of a 12470 volt system and each leg of the Y would be one 7200 volt coil. On a delta system each corner of the triangle is one phase of a 7200 volt system and each side would be a 7200 volt coil. Draw it out and you will see. What determines if we Y or delta the high side is coil rating and primary voltage, if they are the same it will be delta, if primary is higher it will be Y or star as they are the same. And what determines if you get a delta or Y low side is the service voltage you want. If you want 120/240 it will be delta, if you want 120/208 it will be Y.
On the high side of a Y connected bank of transformers you don't always ground it. Some times you let it float. And you don't always have to have 3 transformers, you can have open delta and open Y with 2 transformers.
I have some transformer connections on my web page that I put up for a discussion on a usenet group, thought they might help some. The Scott connection at the bottom of the page is for 3 phase to 2 phase. They take special transformers and are pretty rare. 

http://murrayranch.com/Electricity.htm

Don

Tesla list wrote:

Original poster: Justin <rocketfuel@xxxxxxxxxxxxx>

Hi All,
Just an update, here are the specs on the pig:
15KVA
Rated Volts: 7200/12470Y        120/240
2.2% impedence
Orto Filled
http://jay.g-cipher.net/pig2.jpg
http://jay.g-cipher.net/pig1.jpg

I'm curious what the Y means in the "12470Y"...any ideas?

Thanks as always!
Justin


On Mon, Jun 05, 2006 at 01:45:12AM -0600, Tesla list wrote:
 > Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
 >
 > Hi Gerry,
 >
 > Certainly there's a place to dispose of hazardous waste. Look in the
 > Yellow pages for Hazardous Waste Removal or similar. A call to any of
 > the company's listed should lead you to a place that will take pcb oil.
 >
 > Take care,
 > Bart
 >
 >
 >
 > Tesla list wrote:
 >
 > >Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
 > >
 > >Hi Bart,
 > >
 > >Is there a place to dispose of PCB oil if needed???  I think Terry
 > >got rid of some radioactive stuff at a county or state site that
 > >takes toxic stuff.
 > >
 > >Gerry R.
 > >
 > >
 > >>Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
 > >>
 > >>Hi Justin,
 > >>
 > >>It may very well have pcb's. As long as you don't intend on bathing
 > >>in the oil, I don't see a problem. The only problem is if you tried
 > >>to dispose of the oil. As long as you leave it in the case and use
 > >>the pig as intended, it's fine. If the pig doesn't work, well, then
 > >>your stuck with a case full of pcb oil. So verify it works or get a
> >>written guarantee from the seller to buy back the pig if it doesn't work. 
 > >>
 > >>Take care,
 > >>Bart
 > >>
 > >>Tesla list wrote:
 > >>
 > >>>Original poster: Justin <rocketfuel@xxxxxxxxxxxxx>
 > >>>
 > >>>Hi All,
 > >>>
 > >>>The opportunity to buy a pole pig just landed in my lap.
 > >>>This pig was in service recently and was taken down a couple of years
 > >>>ago when a new road went in.
 > >>>
 > >>>Do you all think there's any chance it would contain PCBs?
 > >>>
 > >>>I'm a bit wary of even messing with this sucker, but for $50 I can't
 > >>>pass it up...unless it's full of PCBs in which case it doesn't seem
 > >>>like a good idea.
 > >>>
 > >>>
 > >>>Anything else I should look for?  I'll bring a meter with me to test
 > >>>continuity, but if there's anything else I can try I'd appreciate any
> >>>tips. Not sure what the KVA rating it yet, but it's about 3.5 feet tall 
 > >>>so I imagine it's "big".
 > >>>
 > >>>
 > >>>Regards,
 > >>>
 > >>>Justin
 > >>>
 > >>>
 > >>>
 > >>
 > >>
 > >
 > >
 > >
 > >
 > >
 > >
 > >
 >
 >