RATINGS DEFINITION
The power ratings of Emergency Standby and Prime are in accordance with the
standard of IS08528. Fuel Stop power in accordance with the standard of ISO3046.
Electric power (kW) should be estimated by considering generator efficiency,
cooling fan power loss and power derating due to altitude and temperature.
STANDBY POWER RATING is applicable for supplying emergency power for the
duration of the utility power outage. No overload capability is available for this
rating. A standby rated engine should be sized for a maximum of a 70% average
load factor and 200 hours of operation per year, this includes less than 25 hours per
year at the Standby Power rating.
PRIME POWER RATING is available for an unlimited of hours per year in variable
load application. Variable load should not exceed a 70% average the Prime Power
rating during any operating period hours., The Total operating time at 100% Prime
Power shall not exceed 500 hours per year.
10% overload capability is available for a period of 1 hour within a 12 hours period
of operation. Total operating time at the 10% overload power shall not exceed 25
hours per year,
CONTINUOUS POWER RATING is the power that the engine can continue to use
under the prescribed speed and the specific environment condition in the normal
maintenance period stipulated in the manufacturing plant. And continuous power
applicable for supplying utility power at a constant 100% for an unlimited number of
hours per year. No overload capability is available for this rating.
Two radiator options are provided, based on allowable maximum Air temperature On radiator inlet ( Air On 40 °C) Air On 50 °C
- ATB (Ambient Temperature before Boiling ) of generator set varies depending on the engine room ventilation design, even if the same radiator applied. Adequate selection of
radiator options by means of the cooling test is highly recommended, and generator set makers are responsible for the selection.
