Need a transformer(s) to go from 21.6 kV to 34.5 kV.
Need a transformer(s) to go from 21.6 kV to 34.5 kV.
(OP)
We are looking for a transformer(s) to go from 21.6 kV to 34.5 kV. Since this is not a common transformer, we are looking at using two transformers back-to-back, a 21.6 kV / 480 V. with a 480 V / 34.5 kV and each approximately 2500 kVA. Any suggestions on where we could locate a 21.6 kV transformer as this does not appear to be a common voltage outside of Texas.






RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
You want a ratio of around 1.6:1 (i.e., 34.5/21.6). I'd look for a transformer with higher voltages than you need but with a 1.6 ratio. It's possible you might find a standard rating this way, but I'm not sure.
Also, if you find something close, you can get fixed taps to adjust the ratio further.
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
You can but I think only if the low side's insulation is rated for the high sides voltage. An open of the common winding gets you the Full Monty downstream.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
Agree with Magoo2 and you Zazmat. Used two trafos back to back.
Regards.
Slava
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
I'd try Cooper, ABB, GE-Prolec, Howard, etc. and see what they say.
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
Liquid filled, dry, or cast coil?
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
I would have to check on that, but do you know of any type that is available?
Thanks
Zeeshan
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
I think they would be happy to build you an autotransformer for the right price.
You might also look for a 20.8 kV transformer, which is a semi-standard voltage in the northwest US. The taps could probably get you to where you need to go.
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
This will probally be a custom job if you dont want to use 2 units. If you want to use 2 I can provide those also but as mentioned above, not the best idea.
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
Consiter your application for ground source. An auto transformer is a good option.
Interesting enough the phase to ground voltage for 34.5kv is about 20kv, or close to the Phase to phase voltage you are looking for.
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
As for being common, it take days to replace a commonly available one as well so if you are worried about that it needs to be addressed by redundancy in the design. I also agree that using two transformers in series is inefficent and wastes space as well.
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
I'm so sorry.
I read now again thread. My bad!!!! I meant: not used two trafo back to back.
Sorry again.
Regards.
Slava
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.
Do you have any contact info. I could forward to my folks?
RE: Need a transformer(s) to go from 21.6 kV to 34.5 kV.