220/11kV Transformer- Minimum Rating?
220/11kV Transformer- Minimum Rating?
(OP)
I'm looking at a small waste to energy plant where the generator output will be around 20MW at 11kV. Unfortunately the only possible utility connection is at 220kV. Is it possible to build a 220/11kV transformer with such a small rating?
Regards
Marmite
Regards
Marmite






RE: 220/11kV Transformer- Minimum Rating?
- figure out the right tx configuration (Y-Y, D-Y, Yg-Yg, D-Yg, and so on) because this will affect the zero sequence currents, harmonics transfer between generator and utility system;
- what are your local distribution utility requirements at the connection point;
- any protection requirements?;
- applicable tx standard for %Z, fusing, construction design, and so on; and
- the minimum efficiency standard you would need to go by (whether it follows minimum efficiency standards or TOC)
RE: 220/11kV Transformer- Minimum Rating?
Have seen 275/11kV at 24/36MVA ONAN/ONAF, they were our station service transformers at Teesside. They came from the old ABB works at Dundee, but the capability exists to build them elsewhere.
RE: 220/11kV Transformer- Minimum Rating?
Now to dispatch your 20 MW power, you may also need a transformer of 25/35 MVA rating. You should be able to buy from the competitive market.
RE: 220/11kV Transformer- Minimum Rating?
Thanks & regards
Marmite
RE: 220/11kV Transformer- Minimum Rating?
RE: 220/11kV Transformer- Minimum Rating?
Another change coming is increaed rating for subtransmission transformers.Earlier 220/33 kV rating was limited to 60 or 80 MVA due to the limitaion in rupturing capacity of 33kV breakers. Today there are applications of 180MVA 220/33kV units at high power density areas eg. high capacity oil refineries.
RE: 220/11kV Transformer- Minimum Rating?
However, if you need only a few hundreds kVA at 11 kV, another solution could be to use SF6 insulated station power transformers (available from 25 kVA to 1 MVA): https://library.e.abb.com/public/76941f54e79c84bcc...
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