- The standards complied with are
IS 13364; IS 4722; IEC 34-1; BS 4999-5000; VDE
0530; CEI 2-3; NF 51-100, 111; OVE M-10.
- Class H insulation with the temperature
rise restricted to 100°C.
- Voltages are 380-415V at 50Hz and
440-480V at 60Hz (Y connected). Special voltages
and connections can be provided on request.
- Single phase ratings are approximately
60% of the three phase ratings.
- Permissible overloads are:
10% for 1 hour
15% for 10 minutes
30% for 4 minutes
50% for 2 minutes
followed by one hour of normal running.
- The total harmonic distortion of
the machine on no-load is less than 3%.
- The voltage regulation is 1% for
non-distorting loads between 0-100% (when the
speed is within ± 5% of the rated speed
and the power factor is between 0.8 and 1).
- Voltage can be adjusted to ±
5% at site.
- The transient voltage drop on application
of full load at 0.8 power factor is between
15 and 20%. The output recovers to within +
3% in less than 0.6 seconds.
- The short circuit current is greater
than 3 times the rated current.
- Motor starting of approximately
I HP per kVA is possible when the AVR is used.
The exact values depend on the torque characteristics,
moment of inertia of the motor and the maximum
acceptable voltage drop.
- The generators have an oversized
damper cage and are suitable for parallel operation
when equipped with a droop transformer.
- When the prime mover speed drops,
the output voltage is reduced to prevent engine
overload.
- Initial excitation is built
up using permanent magnets that are fixed on
the Exciter. This ensures that the machine does
not fail to develop voltage due to loss of residual
magnetism.
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