MIL-HDBK-1133
where
Average Load (kW) = total utility billed kilowatts in
billing period
Peak Load (kW)
= peak billed kilowatts from utility
billing
The (FLD) and (FDLS) factors are used to derive the energy loss
factor (FELS) shown in Equation 4. This calculation combines the
partial loading and load variation effects into one factor:
2
F ELS = F DLS ( 0 .3 F LD + 0.7 F LD )
(4)
The equations for calculating the overall contribution of
transformer losses to demand and energy consumption are given in
Equations 5 and 6:
Demand Loss (Watts ) = NLL + F DLS * LL
(5)
Energy Loss ( kWh ) = hours( NLL + F ELS * LL ) / 1000
(6)
where
NLL
= transformer no-load loss (watts) from Table D-1
in Appendix D
LL
= transformer load loss (watts) from Table D-1 in
Appendix D
hours = hours in the period being considered (month,
year)
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