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Transformer field test #13465
09/04/02 09:39 PM
09/04/02 09:39 PM
S
scjohn  Offline OP
Member
Joined: Jul 2002
Posts: 74
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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Re: Transformer field test #13466
09/04/02 10:36 PM
09/04/02 10:36 PM
G
George Corron  Offline
Member
Joined: May 2001
Posts: 717
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.

Re: Transformer field test #13467
09/04/02 11:36 PM
09/04/02 11:36 PM
T
TE  Offline
Member
Joined: Aug 2002
Posts: 36
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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