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wangotango01@yahoo.com
Participant

Join Date: Oct 2009
Posts: 1

Pad Mounted Transformer

10/26/2009 3:27 PM

Needing a little help I have a 480v 3 wire delta padmount transformer wanting to float b phase. I talked to the transformer comany they said no problem. When I look in metering book it only shows grounded b phase 2 cts 5s meter. What will happen if I dont ground b phase? Any help would be greatly appreciated. Chip
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Carl Pugh
Power-User

Join Date: Jun 2009
Posts: 134
Good Answers: 11
#1

Re: Pad Mounted Transformer

10/27/2009 12:57 PM

What would happen if there was a short from primary to seconday.

These shorts do happen.
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CJMcGill
Guru

Join Date: Jul 2008
Location: SoCal USA
Posts: 556
Good Answers: 23
#2

Re: Pad Mounted Transformer

10/27/2009 1:29 PM

Dear Wango,

The grounding is a safety issue, not a metering issue, unless of course the power provider has a requirement about grounding B phase.

As long as you use B phase as the ending potential, with CT's in A and C phases, your meter will have what it needs to register correctly.

I strongly recommend that you have alarms to reveal grounding of one of the phases so you can correct the condition before a second phase grounds, either that or a current limiting grounding system.

Regards, CJM

__________________
 I do not 'know it all', but i will admit that I would like to. CJM
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