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MICROSTAR + SYSTEM MANUAL • page 9 of 21
Simplex, Inc., 270 Riverside Parkway Suite G Austell, GA 30168 • 678-214-6575 • Fax 678-214-6670
Printed in the USA. • www.simplexdirect.com
APPENDIX B -
CA
L
CU
L
A
TIO
N
S
& 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
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