Single Phase Transformer Standards

[gunnarhole]

Can you tell me what IEEE Standards would apply to a oil-filled, single phase, pad mounted transformer with a 480 VAC Primary and 12,500 and 16,500 VAC Secondaries. Power rating of 200 – 500 kVA. The standards I find appear to be limited to lower voltage primaries.

Regards

 

[gepman]

Lower primary than 480V? I don't think that it makes any difference if the high voltage or the low voltage is the primary, the same standards apply.

It seems a rather large rating for a single phase transformer but I would assume IEEE C57.XX.XX still apply or at least it could be built to those.

See

http://ieeexplore.ieee.org/xpl/stan...57&opentree=on&imageField.x=14&imageField.y=8

for listing.

 

[gepman]

I think that I misinterpreted your question and I now realize that you were referring to the single phase standards which reference 120/240V.

The IEEE standards are written for standard commercial and industrial products. The typical oil-filled padmount single phase transformer is used in URD (Underground Residential Distribution). Your application is not a standard one, in fact the only thing that I can think of is that you have some type of generation at 480V single phase (solar?) and must get it back on the grid. IEEE is only going to write standards for more typical applications not very unusual ones (I found this out when I tried to find a standard for liquid rheostats for starting wound rotor motors).

You can reference the single phase transformer standards (IEEE C57.12.(00),(21),(23),(25),(26)) etc. and make the changes for 480V (I doubt that there will be much difference between 240V and 480V) or you can reference the three phase standards ((00), (22), (24), (25), (26)) and change them to single phase. If you are up in the 500kVA range I would do the latter but if you were at the 200 kVA range I would consider the former. The kVA limit on the single phase transformers is 167 kVA so the manufacturer would probably have a hard time squeezing the coil into a small single phase tank.

 

[stevenal]

C57.12.00

 

[Cajun62234]

Why am I thinking this is a 'buck 'n boost' situation....maybe I'm not digesting the problem?

 

[waross]

The little utility that I service in the Caribbean uses 333 KVA 480 V:7620 V (13,200 volt system) transformers. We never have a problem ordering replacements out of the US.
We generate at 480 V and distribute at 13,200 V.
Try the Cooper Power Systems web site.

Bill
--------------------
"Why not the best?"
Jimmy Carter