11PREPARATION TO SUPPLY THE ELECTRIC POWER
ENGLISH
A Connecting a motor.
When starting the motor, the voltage drops
immediately. The circuit may be opened if an
electromagnetic switch is connected to the same
circuit. When connecting two motors or more, make
sure the total current capacity of the motors does not
exceed the total rated current.
A Connecting to lights and electric heaters.
When connecting to lights or electric heaters, the
generator can be used up to the rated capacity.
When using a single phase, it can be used up to the
rated current.
A Power factor calculations.
The power factor calculation is used to determine
input of the electrical devices.
AC devices
Electric power (W)
= Voltage (V) × Current (A) ÷ Power factor
Power factors of commonly used devices are listed in
the following table.
A Ordinarily, a motor is rated in kW. This does not refer
to motor output.
Motor input (kVA)
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
=
Motor output (kW)
Motor efficiency × power factor
To Next Page
Loading...
Need help?
General
