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®
LOAD BANK MANUAL • Saturn 3000 DV • W.O. 63798/2 • page 14 of 20
APPENDIX B -
CALCULATIONS
& FORMULAS
The following calculations are used to
determine the actual kilowatt load being
applied by the Load Bank, when line
voltages and currents are known (at 1.0
power factor).
3 Phase
1. Read all three line currents and find
the average reading.
2. Read all three line-to-line voltages
and find the average reading.
3. Multiply the average current times
the average voltage.
4. Multiply the answer of step #3 times
the square root of 3 (1.732).
5. Divide the answer of step #4 by 1000.
The answer is the actual kilowatts of
load being applied by the Load Bank.
Single Phase
1. Determine the line current.
2. Determine the line-to-line voltage.
3. Multiply the line current times the
line-to-line voltage.
4. Divide the answer of step #3 by 1000.
5. The answer of step #4 is the actual
kilowatts being applied by the load
bank.
EXAMPLES
Using line voltages and currents:
3 Phase
Current Readings
Voltage Readings
A
1
= 249A
V
1-2
= 481V
A
2
= 250A
V
2-3
= 479V
A
3
= 254A
V
3-1
= 483V
Average Current =
A
1
+ A
2
+ A
3
3
=
249+250+254
3
=
251A
Average Voltage =
V
1-2
+ V
2-3
+ V
3-1
3
=
481 + 479 + 483
3
=
481V
Kilowatts
=
Volts x Amps x 1.732
1000
=
481 x 251 x 1.732
1000
=
209.1KW
Single Phase
Current Reading: 150A
Voltage Reading: 240V
Kilowatts
=
Volts x Amps
1000
=
150 x 240
1000
=
36.1KW
