Liquid-Filled Transformer and compliance with NEC

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PQexplorer

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May i use a step-down transformer(oil-filled) 480-208Y/120V of 160kVA inside a data center?...or it's a better practice use a Dry-type one?

What about reliability??

Thanks
 
Re: Liquid-Filled Transformer and compliance with NEC

Maybe. See 450.23(A). But why would you want to? It would require, at the minimum, an oil containment area (e.g., concrete curbs around the base of the transformer). If you don't use a "less-flammable liquid" in the transformer, then you will need a "vault." You probably wouldn't want to construct a vault within the data canter.

A dry-type is more likely to suit your needs. They have a good record of reliability, so long as you treat them well. A data center will be full of harmonic currents. You need to take that into account, when selecting and sizing your transformer.
 
Re: Liquid-Filled Transformer and compliance with NEC

That's a small transformer for a liquid filled. Is there a specific reason for the liquid filled?I would certainly explore the additional cost that would be encured to conform with the NEC to that of a 150kva drytype, if you don't need the additional 10kva, which you may need to go with a k13.
 
Re: Liquid-Filled Transformer and compliance with NEC

I agree with all of the replies, make sure it is K-rated for the harmonics and have it cleaned and tested every 1-3 years depending on how clean the environment is, I assume a data center would be pretty clean, so a cleaning, winding resistance, PI test, and TTR every 3 years should keep it in tip top condition for about 60 years or so. :cool:
 
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