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300KVA Transformer photos #163767 05/16/07 03:24 PM
Joined: Oct 2000
Posts: 3,636
Admin Offline OP
Administrator
Member
Quote
All,

I have viewed your website a lot of times and watched in amazement at some of what is posted. I'd rather watch, however, a transformer started making some funnny noise when I was on site, and I de-energized it without permission. Attached are some of the photos, pay close attention to phase A.

Dennis W.
Minneapolis

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

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Re: 300KVA Transformer photos [Re: Admin] #163768 05/16/07 04:41 PM
Joined: Feb 2002
Posts: 840
C
CTwireman Offline
Member
There could be a slight problem with that. wink


Peter
Re: 300KVA Transformer photos [Re: CTwireman] #163780 05/16/07 08:04 PM
Joined: Feb 2003
Posts: 939
F
frenchelectrican Offline
Member
Ahh good catch there.

i am suprised that it did not trip the OCPD yet shocked

Merci, Marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

Re: 300KVA Transformer photos [Re: frenchelectrican] #163790 05/17/07 06:49 AM
Joined: Dec 2005
Posts: 860
R
RODALCO Offline
Member
Good call to shut it down.

Looks like a loose connection in that jumper, overheated and arced away the flat tab of the lug and terminal of the TX.

Cheers

Raymond


The product of rotation, excitation and flux produces electricty.
Re: 300KVA Transformer photos [Re: RODALCO] #164109 05/25/07 12:48 AM
Joined: Oct 2004
Posts: 803
mxslick Offline
Member
Dennis W:

A question: Can you describe the "funny noise"? I have a theatre with a similar Tx that makes a peculiar high-pitched buzz/whine..didn't notice any burning smells but it sure is loud!

Re: 300KVA Transformer photos [Re: mxslick] #164494 06/04/07 05:56 PM
Joined: Feb 2003
Posts: 288
Y
yaktx Offline
Member
Good call. I'd say that transformer would be pretty noisy anyway, what with the hard-piped connections. I'd guess the funny noise would be something other than 60Hz plus harmonics, no?

Re: 300KVA Transformer photos [Re: yaktx] #164503 06/04/07 06:47 PM
Joined: Apr 2002
Posts: 7,233
HotLine1 Offline
Member
For a 300KVA xfr, the secondary conductors seem a little on the wimpy side??

300KVA is usually 800 amp secondary MOCP @ 208 volt, 3 phase.

Oversized xfr?? Not that it matters now, but I'm curious.
John


John
Re: 300KVA Transformer photos [Re: HotLine1] #164553 06/06/07 02:36 AM
Joined: May 2003
Posts: 2,876
E
e57 Offline
Member
Ah, I have seen this before - the "Melti-tap" transformer.

When I was younger and far stupider than I am today. I did a service call for mixed voltages at a supermarket, and went all over trying to find the place that had a neutral - all the way back to the transformer and pulled the cover off (LIVE - DUMB) to find a glimering molten pool of Aluminum. Do ya know that feeling like you're looking at a nest of angry hornets close up? "I'll just put this cover back on with 2 screws, and get away from this fast..."


Mark Heller
"Well - I oughta....." -Jackie Gleason

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