How Does CAT Genset Work
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Engine KW Generator KVA
Brake Kilo Watt Electrical Kilo watt
Synchronous AC Generator
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Based on ISO 8528-1 VS CAT it self
ISO rating
LTPLimited time running power
COPContinuous operating power
PRPPrime running power
CAT rating
Standby
Continuous
Prime
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StandbyOutput available with varying load for the duration of the interruption for the normal power source
PrimeOutput available with varying load for an unlimited time
Continuous Output available without varying load for an unlimited time
Prime + 10 %Output available with varying load for the duration of theinterruption for the normal power source
CAT rating definitions
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StandbyOutput available with varying load for the duration of the interruption for the normal power source
PrimeOutput available with varying load for an unlimited time
Continuous Output available without varying load for an unlimited time
Prime + 10 %Output available with varying load for the duration of theinterruption for the normal power source
CAT rating definitions
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StandbyTypical load factor 60 % or lessTypical hours per year 100 hoursTypical peak demand 80 % of standby rated ekW with 100 %
of rating available for the duration of anemergency outage
Typical application Building services standby and enclosedor sheltered environment
Standby rating definitions
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Prime + 10 %Typical load factor 60 % or lessTypical hours per year Less than 500 hoursTypical load demand 80 % of rated ekW with 100 % of rating
available for duration of an emergencyoutage
Typical application Uncovered standby, rental, power moduleUnreliable utility
Prime + 10 % rating definitions
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Prime rating definitionsPrimeTypical load factor 60 % to 70 %Typical hours per year No limitTypical peak demand 100 % of prime rating used occasionallyTypical application Industrial, pumping, construction, peak
saving or cogeneration
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Continuous rating definitionsContinuousTypical load factor 70 % to 100 %Typical hours per year No limitTypical peak demand 100 % of continuous rating used 100 %
of the timeTypical application Base load, utility, cogeneration, parallel
operation
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Load factor = % of time X % of load
% of time = --------------------------Time at specific load
Total operating time
% of load = -----------------Specific load
Rated load
LOAD FACTOR
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LOAD FACTOR
Sample Genset rated at 550 KWRuns two hours a weekDuring two hours it runs at 400 KW for 1.5 hours
% of load = ------------400 Kw550 Kw
= 0.73 %
% of time = ----------------90 minutes
120 minutes= 0.75 %
Load factor = 0.73 X 0.75 = 54.75 %
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Rating
Generator name plate
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CAT generator rating is based on temperature riseRefer to NEMA ( National Electric Manufactures Association )And IEC ( International Electro-technical Commission )
Generator class Temp. rise Gen-set rating
F 80 ContinuousH - -
F 105 PrimeH 125 Prime
F 130 StandbyH 150 Standby
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How to define total temperature limit ?
Temperature rise + 40oC + 10oC
As table shownAmbient temp
Hot spot margin
Sample:Prime power F class has 105OC riseThe total temp rise is 155OC
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Field common operating rpm1000 rpm1200 rpm1500 rpm1800 rpm
Basic generator
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Three phase generation
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