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#13465 - 09/04/02 10:39 PM Transformer field test  
scjohn  Offline
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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#13466 - 09/04/02 11:36 PM Re: Transformer field test  
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.


#13467 - 09/05/02 12:36 AM Re: Transformer field test  
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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