L i f e & E n e r g y A u d i t
Sample ECO - To reallocate the loading pattern of different transformers
Present Status
Presently there are 8 numbers of transformers in the plant. Most of the transformers are underloaded.
Modification Proposed
Transformers operate with maximum efficiency when they are loaded at 50 to 70%. The transformers are loaded very much below the rated kVA i.e. 359 against 1250. It is recommended to install a lower capacity transformer of 750 kVA. The transformer (750 kVA) can be used for this purpose.
The annual savings in reallocating the loading pattern of transformer in the plant is Rs.7,410.
Transformer Loading:
Transformer Rated kVA Voltage Current Loading kVA Loading %
1 2000 440 375 285.78 22.86
2 2000 440 375 285.78 14.28
3 2000 440 1200 914.94 45.72
4 2000 440 1280 953.29 47.66
5 2000 440 725 552.50 27.62
6 2000 440 640 465.56 23.27
7 1250 440 471 358.87 28.70
8 2000 440 755 575.55 28.75
Savings obtained by reallocating transformer loads for transformer No.7 :
Existing average load = 358.87 kVA
Existing transformer rating = 1250 kVA
Percentage loading = 28.70%
Recommended T/F rating
with respect to average load = 750 kVA