Transformer Rating (kVA)

Secondary Voltage (V)

Load (kW)

Load Power Factor (%)

Full Load I2R Losses in Primary (W)

Full Load Eddy Current Losses in Primary (W)

HMT Full Load Primary Losses (W)

Load Hours per Day

Operating Days per Year

Utility Energy Rate ($/kWh)

Utility Demand Rate ($/kW-mo)

>HMT Capital Cost Premium ($)

1

3

5

7

9

11

13

15

17

19

21

23

25

 

 

Current Total Harmonic Distortion (%)

Load (kVA)

Load (%)

Phase Current (@60 Hz)

K Factor

Full Load Eddy Current Losses in Primary (W)

Full Load Total Losses in Primary (W)

Load Losses in Primary at Input Load Level

Load Losses in Primary for K=1 at Input Load Level

Harmonic-related Losses in Primary (kW)

Non-Harmonic Related Savings/Losses (kW)

Total Direct HMT Savings (kW)

Avoided Cooling Power (kW)

Annual Energy Savings ($)

Annual Demand Savings ($)

Total Annual Savings ($)

Simple Payback (years)

Per-Unit
Currentb (Ih-pu)

K Factor

Notes:
a. This example assumes a completely balanced nonlinear load and that the difference in core losses between the HMT and the alternative transformer is negligible.
b. The per-unit current at any harmonic is equal to the magnitude of that current divided by the square root of the sum of the squares of the currents at all frequencies.