RE: 12740Y/7200

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Godfrey Loudner" <ggreen@xxxxxxxx>

Nice article: http://www.answers.com/topic/three-phase-electric-power.

Godfrey Loudner

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Saturday, December 30, 2006 12:21 AM
To: tesla@xxxxxxxxxx
Subject: Re: 12740Y/7200


Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi David,

When a two bushing single phase PIG is marked 7200/12470Y,  are the
two bushings suppose to be connected across two of the three phases
and subsequently see 12470 across the two bushings, or are the  two
bushings suppose to be connected from one phase to neutral and thus
see only 7200V?? If the former connection is allowed, it would seem
like there would be a common mode voltage on the two bushings and
this would be a problem.  If only the latter connection is allowed,
then why two HV bushings??

Also, does the latter connection result in 120/240 on the LV side,
and if so then would the 12470V connection result in 208/416 on the LV
side??

(just when I thought I understood it)

Gerry R.