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Re: 12740Y/7200
Original poster: Bert Hickman <bert.hickman@xxxxxxxxxx>
Tesla list wrote:
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.
Hi Gerry,
The maximum intended voltage across the HV winding will always be the
LOWER of the two faceplate numbers. With two bushings, the
transformer can be driven directly off two phases within a 7200 volt
delta system.
Bert
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