PREPARATION TO SUPPLY THE ELECTRIC POWER
8
ENGLISH
Power factors of commonly used devices are listed in the
following table.
C
Ordinarily, a motor is rated in kW. This does not
refer to motor output.
Motor input (kVA)
= Motor output (kW) / (Motor efficiency x power factor)
A
If a lighting system is employed together with some
types of computers and inverter air-conditioners and /
or the regulated power supply for TV sets, the lights
might suffer flickering. This phenomenon does not
indicate a fault of the generator: it is caused by poor
matching between the above-mentioned regulated
power supply and the generator's automatic voltage
regulator. In such a case, modify the load combination
to eliminate the flickering.
Load type
Power factor
Single - phase induction motors
0.4 to 0.75
Electric heaters, incandescent lamps
1.0
Commutator motor
0.8 to 0.95
Fluorescent lamps, mercury lamps
0.4 to 0.9
AC arc welder
0.4 to 0.6
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