Distribution Transformer Losses
a) No-load losses, i.e., iron losses:
No-load losses in kWh
of one distribution transformer = No load loss of transformer in kW x number of hours the transformer was in service during the month
b) Load losses, i.e., copper losses:
Copper losses in kWh = Copper loss of each transformer capacity wise in kW x (Actual load / Full load)2 x number of hours the transformer capacity wise was in service during the month x LLF