Specifications

Simplex, Inc., 5300 Rising Moon Road, Springfi eld, IL 62711-6228 • 217-483-1600 • Fax [phone]
Merlin-150-300c.indd • © 2011 Simplex, Inc. All Rights Reserved. • Printed in the USA. • www.simplexdirect.com
LOAD BANK MANUAL • Merlin 150-300 Load Bank • page 11 of 15
APPENDIX B -
C A L C U L A T I O 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 Ph a s e
1. Read all three line currents and fi nd
the average reading.
2. Read all three line-to-line voltages
and fi nd 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.
S i n g l e P h a s e
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
= 2 4 9 + 2 5 0 + 2 5 4
3
= 251A
Average Voltage = V
1-2
+ V
2-3
+ V
3-1
3
= 4 8 1 + 4 7 9 + 4 8 3
3
= 481V
Kilowatts = V o l t s x Amps x 1 . 7 3 2
1000
= 4 8 1 x 2 5 1 x 1 . 7 3 2
1000
= 209.1KW
Single Phase
Current Reading: 150A Voltage Reading: 240V
Kilowatts = V o l t s x Amps
1000
= 150 x 240
1000
= 36.1KW