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Re: buying a pole pig



Original poster: DRIEBEN@xxxxxxxxxxxxxxx
Gerry,

I am no EE or a specialist in electrical
power distribution but it is my understanding that
the "Y" rating is only for a 3-phase delta hookup
where the input HV bushings are just crossed between
two of three phases. I agree with what Mike Marcum
also stated in that the "Y" rating is actually the
"delta" voltage rating and it seems that pigs "Y"
rating should actually be the lower of the voltages
(12470/7200Y as opposed to 12470Y/7200) since the
12470 volts would only be seen in a delta cross
phase hookup.

David Rieben

----- Original Message -----
From: Tesla list <tesla@xxxxxxxxxx>
Date: Tuesday, June 6, 2006 1:55 pm
Subject: Re: buying a pole pig
To: tesla@xxxxxxxxxx

> Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
> Hi David,
>
> Seems like he could drive it with 240 and get the 12470 rating.
Yes??
>
> Gerry R
>
>
> >Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
> >
> >Justin,
> >
> >The "Y" refers to a wyed cross phase hookup in a
> >three phase configuration. 12,470 is the sq. rt. of 3
> >x 7200 volts. In single phase configuration, the 7200
> >volt rating is all that you will be getting and 7200 is
> >a little on the low side for a 15 kVA SG driven Tes-
> >la system, but hey, if it's free, then go for it.
> >
> >David Rieben
> >
> >
> >----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> >To: <tesla@xxxxxxxxxx>
> >Sent: Monday, June 05, 2006 10:15 AM
> >Subject: Re: buying a pole pig
> >
> >
> >>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