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Trying to get approximate numbers for core/iron/parasitic losses in large (50-500 kVA) distribution transformers that might serve one light-industrial building or complex, taking 13,800V to 480V 3-phase.The application is very low duty-cycle, so unloaded losses will dominate.
Have spent quite a bit of time browsing the Web; most postings either talk about standards or promote advanced tech that may not be in service yet.
Is there a general guideline our group might use?
Thanks very much for all advice.
Mike
Ldscp said:
Trying to get approximate numbers for core/iron/parasitic losses in large (50-500 kVA) distribution transformers that might serve one light-industrial building or complex, taking 13,800V to 480V 3-phase.The application is very low duty-cycle, so unloaded losses will dominate.
Have spent quite a bit of time browsing the Web; most postings either talk about standards or promote advanced tech that may not be in service yet.
Is there a general guideline our group might use?
Thanks very much for all advice.
Mike
Dear Mr. Mike ;
As I don't use these special Voltages, I can give you an idea about that I used for some special applications where the Voltages are ” 13.2 KV & 420 V ” and the manufacter is ” Zucchini – Italy “.
– 100kVA : Po : 380W, Pt(+70°C) : 1800W
– 160kVA : Po : 480W, Pt(+70°C) : 2550W
– 250kVA : Po : 750W, Pt(+70°C) : 3120W
– 315kVA : Po : 1050W, Pt(+70°C) : 4050W
– 400kVA : Po : 1320W, Pt(+70°C) : 5000W
– 500kVA : Po : 1630W, Pt(+70°C) : 5960W
Where :
– Po : the Losses without load
– Pt(+70°C) : the losses with ful load at ” +70°C “
Regards.
Thanks very much, Mr. Georges – that is very complete information, and exactly what we needed!
-Mike
Dear Mr Ghali,
Apart fom those mentioned above,
What about the losses of transformer with rating above 500kVA, i.e with the following ranges
750kVA-2000kVA
Regards.
Ally Kanyondo said:
Dear Mr Ghali,
Apart fom those mentioned above,
What about the losses of transformer with rating above 500kVA, i.e with the following ranges
750kVA-2000kVA
Regards.
Dera Mr. Ally ;
Please define the Working Voltages, are the same as above or different ?
Regards.
Spir Georges GHALI said:
Ally Kanyondo said:
Dear Mr Ghali,
Apart fom those mentioned above,
What about the losses of transformer with rating above 500kVA, i.e with the following ranges
750kVA-2000kVA
Dear Mr Ghali
For the above range, take the working voltage as 11kV and 33kV(distribution levels in my country)
Regards.
Dera Mr. Ally ;
Please define the Working Voltages, are the same as above or different ?
Regards.
Dear Mr. Ally ;
Please find below the relative information:
For ” 11 kV ” :
– 630kVA : Po : 1790W, Pt(+70°C) : 6940W
– 800kVA : Po : 2470W, Pt(+70°C) : 8370W
– 1000kVA : Po : 2940W, Pt(+70°C) : 9800W
– 1250kVA : Po : 3520W, Pt(+70°C) : 11800W
– 1600kVA : Po : 3890W, Pt(+70°C) : 14400W
– 2000kVA : Po : 4830W, Pt(+70°C) : 17100W
– 2500kVA : Po : 5990W, Pt(+70°C) : 20700W
– 3200kVA : Po : 4600W, Pt(+70°C) : 23400W
For ” 33 kV ” :
– 630kVA : Po : 2100W, Pt(+70°C) : 6750W
– 800kVA : Po : 2580W, Pt(+70°C) : 8370W
– 1000kVA : Po : 2800W, Pt(+70°C) : 9280W
– 1250kVA : Po : 3000W, Pt(+70°C) : 12350W
– 1600kVA : Po : 3600W, Pt(+70°C) : 14600W
– 2000kVA : Po : 4600W, Pt(+70°C) : 16200W
– 2500kVA : Po : 5780W, Pt(+70°C) : 19800W
– 3200kVA : Po : 6620W, Pt(+70°C) : 22500W
Where :
– Po : the Losses without load
– Pt(+70°C) : the losses with ful load at ” +70°C “
Noting that values are for ” Zucchini – Italy ” transformers, and there's some differences between manufactures.
Regards.
Spir Georges GHALI said:
Dear Mr. Ally ;
Please find below the relative information:
For ” 11 kV ” :
– 630kVA : Po : 1790W, Pt(+70°C) : 6940W
– 800kVA : Po : 2470W, Pt(+70°C) : 8370W
– 1000kVA : Po : 2940W, Pt(+70°C) : 9800W
– 1250kVA : Po : 3520W, Pt(+70°C) : 11800W
– 1600kVA : Po : 3890W, Pt(+70°C) : 14400W
– 2000kVA : Po : 4830W, Pt(+70°C) : 17100W
– 2500kVA : Po : 5990W, Pt(+70°C) : 20700W
– 3200kVA : Po : 4600W, Pt(+70°C) : 23400W
For ” 33 kV ” :
– 630kVA : Po : 2100W, Pt(+70°C) : 6750W
– 800kVA : Po : 2580W, Pt(+70°C) : 8370W
– 1000kVA : Po : 2800W, Pt(+70°C) : 9280W
– 1250kVA : Po : 3000W, Pt(+70°C) : 12350W
– 1600kVA : Po : 3600W, Pt(+70°C) : 14600W
– 2000kVA : Po : 4600W, Pt(+70°C) : 16200W
– 2500kVA : Po : 5780W, Pt(+70°C) : 19800W
– 3200kVA : Po : 6620W, Pt(+70°C) : 22500W
Where :
– Po : the Losses without load
– Pt(+70°C) : the losses with ful load at ” +70°C “
Noting that values are for ” Zucchini – Italy ” transformers, and there's some differences between manufactures.
Regards.]
Dear Mr. Ghali
Thank you very mch for your clarification.
Regards.
I think this site will help you ,
http://www.siemens.hu/htm/ajanlataink/trf/download/geafolproduct_english.pdf
I see Ghail help you but one more isnt anything :)
kusha02 said:
I think this site will help you ,
http://www.siemens.hu/htm/ajanlataink/trf/download/geafolproduct_english.pdf
I see Ghail help you but one more isnt anything :)
Dear Mr. Kusha02
Thanks for your completement
Regards.
it’s really a tough blow for me
i am on 8th semester in university, majoring electrical eng. this far i have been checking all the topics from people journals and some papers but still didnt understand where i should begin this research from, so i try to seek help from you guys if you got some way out for my problems… please share…
tq…
-hanif
university of srwijaya
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