Specifications

NAIROBI OPERATIONAL HUB
UNOPS Building, UN Lane, Off UN Avenue Tel: [phone]
P.O Box 783,Village Market, 00621 E-mail: [e-mail]
Nairobi, Kenya Website: www.unops.org
UNOPS is ISO 9001 certified
4. Distortion of no-load voltage waveform at alternator terminals
shall be within 5% from the sinusoidal waveform.
5. Voltage adjustable range of the output voltage by adjusting the
exciter shall be not less than 3% of rated voltage at rated load and
not less than + -5% of rated under no-load conditions. This
adjustment shall be able to be performed from panel mounted
handle or knob.
6. The voltage of the alternator shall be automatically controlled by
electronic static circuits.
7. The alternator shall not be switched on the load until terminal
voltage has reached at least 90% of the nominal value. It is
essential that the voltage regulation equipment shall have sufficient
fast response time so that the alternator is ready to accept load in
the shortest possible time.
8. The voltage regulator shall be designed to maintain the alternator
terminal voltage constant within + -1% of the nominal value from
no load to full load within normal variations of engine speed with
change in load.
9. The exciter shall be brushless, self-excited, rotor mounted type.
The rectifying elements shall be silicone.
10. The unit shall be suitably protected so that when there is a sudden
variation of load, the sudden increase of field current in the rotor
shall be curtailed and thus the speed build up of the engine and the
voltage build up of generator shall vary proportionately.
11. Terminals with cable end boxes shall be provided respectively for
the alternator and exciter.
12. The cooling air for alternator and exciter shall be drawn through
openings at the non-drive end and exhausted sideways at the
driving end.
13. The alternator shall be fitted with air-condensation heater to keep
the winding in good, dry and safe condition. The air-condensation
heater shall be automatically cut-of when the machine is running.
Necessary on-off switches shall be provided on the control panel
and the operation status of the heater shall be indicated.
14. Temperature Rise