New transformer smoking

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LouisianaApprentice said:
This is the size of it idk what it could be its not burning the paint off its bellowing out from around the windings.
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Does that mean it was powered up with covers removed so you could see that the smoke was coming from the windings themselves?
Smoke "bellowing out" sounds like a bigger problem than just dust, especially if it appears soon after the transformer is powered up (as hillbilly1 mentioned).
Were any measurements made of the line currents into the transformer, preferably without any loading?
 
hillbilly1 said:
Judging from the picture, it looks to be a 112 kva. Doesn’t really matter, does look like it has been dropped pretty hard.
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Yes, it looks like the windings may have shifted down the legs of the core and then possibly contacted the bottom brackets (or maybe the bottom part of the core itself).
 
synchro said:
Yes, it looks like the windings may have shifted down the legs of the core and then possibly contacted the bottom brackets (or maybe the bottom part of the core itself).
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I noticed the same thing but it’s difficult to tell based on the picture. There should be blocking in between the coil and the core.
 
LouisianaApprentice said:
This is the size of it idk what it could be its not burning the paint off its bellowing out from around the windings.
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One thing that come to mind is turn-to-turn shorts from the coil shifting/compressing vertically. When you energize, take ammeter measurements and look for imbalanced readings at no load and with some load applied. Also, secondary voltage readings should be balanced. You “might” be able to catch turn-to-turn shorts with a TTR test, but the turn-to-turn short would have to be a solid connection. I’m still recommending doing a hot spot check with an IR camera, since that will show where the damage is (given that smoke is heat related). If I was tasked with evaluating/accepting, this transformer I would fail it simply for it being dropped.

(You should use wood blocks to transport that transformer so it doesn’t slide off the pallet jack)
 
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Eddie702 said:
How about blowing it out with compressed air
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While that removes surface dust, it will also drive dust into cracks and crevasses; it might be OK for a box or even some panels, but not for a transformer core. Better to start with a brush and a vacuum with a narrow nozzle.

(I also think it looks like it was dropped, the cores look lower than they should be and there's that nice bend in the bottom screen.)
 
Xptpcrewx said:
www.eaton.com

V48M28B06CU-50C | Eaton General purpose ventilated transformer | Eaton

V48M28B06CU-50C - General-Purpose Transformer, Dry Type Distribution, DT-3, Three-phase, PV: 480V, Taps: 2 at +2.5% FCAN, 4 at -2.5% FCBN, SV: 208Y/120V, 80°C, 50 kVA, Cu windings, Frame: 912B, uses WS38
www.eaton.com www.eaton.com
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Fancy that. Learn something new. Never even seen reference to odd sizes. I wonder why. From a production/stocking point, it would seem cheaper to just use standard sizes and fuse them differently.
 
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