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#13465 - 09/04/02 07:39 PM Transformer field test
scjohn Offline
Member
Registered: 07/04/02
Posts: 76
Loc: charleston, SC, USA
Bidding a job with an older exisiting 480-277/208-120, 112.5 kva transformer is to be used. The specs. ask for a field test to be performed to see if the xfrmr is functionig properly before submitting a bid. Problem is there is no power to the building. Is there anyway to test the unit without powering it up??
Thanx, John.
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#13466 - 09/04/02 08:36 PM Re: Transformer field test
George Corron Offline
Member
Registered: 05/16/01
Posts: 728
Loc: Lorton, Va USA
John,
Megger test, TTR (Transformer turns ratio) can be performed prior to energizing. Most any testing company performs these tests on a normal basis.
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#13467 - 09/04/02 09:36 PM Re: Transformer field test
TE Offline
Member
Registered: 08/26/02
Posts: 37
Loc: USA
John,
If you don't have the equipment and aren't familiar with the procedures, I would definitely do as George suggests and have a testing co preform the checks.

However, I wouldn't incurr these costs at the bid stage as they suggest. I would include the cost to test in my bid and state the additional cost to replace the xfmr should it fail at the bottom of my proposal.
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