A 10 MW co-generation plant is operating at a daily load factor of 85 %. Power is generated at 11 KV.
➢ 35 % of the power generated, is exported to grid, through a 7.5 MVA Transformer with 99 % efficiency.
➢ 32 % power generated, is supplied to mill motors, at 600 Volts, through a 5 MVA step down transformer, with 98 % efficiency.
➢ The balance power generated is supplied to other LT Loads and auxiliaries, at 415 Volts, through a 2 MVA transformer, with 98 % efficiency.
Calculate the following:
1) Daily energy exported to grid at 33 KV.
2) Daily mill motors consumption at 600 V.
3) Daily LT loads and auxiliary consumption at 415 V.
4) Daily transformers losses in kWh and % transformers losses
CALCULATION:
1.
Daily generation = (10,000 x 0.85 x 24)
= 2,04,000 kWh
Daily energy generation for export purpose = (2,04,000 x 0.35)
= 71,400 KWh
7.5 MVA transformer loss = [ 71,400 - (71,400 x 0.99) ]
= (71,400 – 70,686)
= 714 kWh
Net energy export to the Grid at 33 KV level = (71,400 kWh - 714 kWh)
=70,686 KWh
2.
Daily energy generation for mill motor consumption = (2,04,000 x 0.32)
= 65,280 kWh
5 MVA Transformer loss = [ 65,280 - (65,280 x 0.98 ) ]
= (65,280 - 63,974.4)
= 1,306 kWh
Net mill Consumption = 63,974 KWh
3.
Daily generation for LT loads & Auxiliary consumption = (2,04,000 x 0.33)
= 67,320 kWh
2MVA Transformer loss = [ 67320 - (67320 x 0.98) ]
= 67,320 - 65,974
= 1,346 kWh
Net LT loads & Auxiliary Consumption = 65,974 kWh
4.
Transformers losses = (714 +1306 +1346)
= 3,366 kWh day
% transformers losses = (3,366 / 2,04,000) x 100
= 1.65 %
(Or)
To meet the plant LT loads and co-gen auxiliary load, the transformer capacity should be more than 2 MVA.
Very good to
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