New transformer smoking

[Strathead]

Sorry not 5kva 50 i think its for a 200 amp 3 phase 208 panel

that would be 45 or 75 or 30

 

[xptpcrewx]

that would be 45 or 75 or 30

Those are standard sizes, but other ratings do exist.

 

[hillbilly1]

This is the size of it idk what it could be its not burning the paint off its bellowing out from around the windings.

Judging from the picture, it looks to be a 112 kva. Doesn’t really matter, does look like it has been dropped pretty hard.

 

[synchro]

This is the size of it idk what it could be its not burning the paint off its bellowing out from around the windings.

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?

 

[synchro]

Judging from the picture, it looks to be a 112 kva. Doesn’t really matter, does look like it has been dropped pretty hard.

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).

 

[xptpcrewx]

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).

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.

 

[xptpcrewx]

This is the size of it idk what it could be its not burning the paint off its bellowing out from around the windings.

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)

 

[Eddie702]

How about blowing it out with compressed air

 

[Besoeker3]

How about blowing it out with compressed air

Not a good idea.

 

[Strathead]

Those are standard sizes, but other ratings do exist.

Really? I have never seen reference to a three phase wye wound secondary in between those. Please cite a part number.

 

[xptpcrewx]

Really? I have never seen reference to a three phase wye wound secondary in between those. Please cite a part number.

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

 

[zbang]

How about blowing it out with compressed air

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.)

 

[Strathead]

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

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.