menu GPC



USEFUL FORMULAS
TO OBTAIN:
SINGLE-PHASE AC POWER
THREE-PHASE AC POWER
kilowatts (kW)
Volts x Amps x PF
1000
Volts x Amps x PF x 1.732
1000
kVA
Volts x Amps
1000
Volts x Amps x 1.732
1000
Amps (kVA unknown)
kW x 1000
Volts x PF
kW x 1000
Volts x PF x 1.732
Amps (kW unknown)
kVA x 1000
Volts
kVA x 1000
Volts x 1.732
Frequency (Hertz)
# poles x rpm
120
# poles x rpm
120
Horsepower required to drive a generator
       kW       
0.746 x Generator Efficiency
       kW       
0.746 x Generator Efficiency
Reactive KVA (KVAR)
V x I x I - (P.F.)
1000
1.732 x V x I x I - (P.F.)
1000


"PF" refers to power factor, which is expressed as a decimal fraction. For example, 80% power factor = 0.8 for the purposes of calculations. In general, single-phase generator sets are rated at 100% power factor and three-phase generator sets at 80% power factor.

"Volts" refers to line-to-line voltage.

"Amps" refers to line current in amperes.

"F" refers to frequency. 0% frequency regulation is defined as isochronous.


V = Voltage
I = Amps
P.F. = Power Factor



GPC Services
517 West Ave. M
San Angelo, TX 76903
(800) 695-5159
(915) 655-4545
gpcs@gpcservices.net
gpcs2@gpcservices.net




Copyright 2004 San Angelo, Texas Chamber of Commerce.
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