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Power Factor Correction for
a Single, Three Phase Motor
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Select horsepower, insert motor efficiency, select motor power factor
percentage,
select desired power factor percentage. The required
kVAR is then displayed.
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Select
hp
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Insert
motor
efficiency
(Note 4)
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Motor
power
factor %
(Note 4)
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Desired
power
factor %
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| The formula to calculate is: [("A" x 0.746) divided by ("B" divided by 100)] multiplied
by "E" (which is the value from array of "C" and "D") = "F". "G" is the value from the range that "F" falls into which are the
standard sizes of kVAR capacitors.
("C" divided by "D") multiplied by the nameplate FLA = corrected current amps. |
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Overload current correction for motor used above
(Maintain previous values,
insert nameplate FLA and press the calculate button.)
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| Nameplate FLA
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| Corrected current
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Notes:
- If power factor correction is needed on a motor controlled by a variable frequency drive or a soft start, contact the device manufacturer for a solution.
- Do not try to overcorrect power factor. This can cause unintended problems that should be avoided.
- This calculator rounds down to the lower value for correct capacitor sizing.
- Full load power factor and efficiency data on the motor needing correction can be found in product data sheets, on the manufacturer's web site or from the motor's supplier.
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© 2008 Mortenson Corporation
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