prime-standby-continious powers

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hello,there are three definition for a genset so what are the differences between them?
prime power is said to be running a genset for all the time true? so if a generator is sized to be 100 KVA it means it can run 100 kva all the time?
or it is something working under for example 70 KVA in avarage and the maximum power it can for a limited time is 100 kva in maximum?? is there any standart definitions? a genset manufacturers claims in its catalogue (not english but) it is defined as the second one cited above( avaragely % 70 load of its prime power)
how can we distinguish prime and continuous power? i especially want to learn the difference of these two also thanks in advance best regards my precious friends..
 
I'm not an expert in all this terminology; I've only ever been offered the choice between standby and prime power. The difference has always been about duty cycle; the prime stuff can run 24/7, but standby is only suited to patch over local power failures.

I can assure you that when you use standby rated plant as prime then they tend to catch fire.

New Zealand found this out in a big way when in June 2006 Auckland CBD lost power for weeks.

The organisations which do have generators are finding that, although you can run them for the usual smoke test every few months, they can't supply power for any extended period of time. Other companies have found that their generators have problems with fuel tanks placed too close to the generator or inadequate cooling and exhaust ducting. On the first full day without power, there were four fire service callouts to generators which caught fire because they weren't used to running for
extended durations
Click to expand...

From Peter Gutman. The generator fires continued for several days thereafter...
 
what i want to learn is this, if i have a 1000 KVA genset can i feed 1000 KVA load continously? ( as i mentioned beforehand, there some manufacturers cite that the variabla load must be % 70 and i cant get why?) if prime power is the one which a genset can handle without time limitation so it could give this power all the time, so what does this % 70 avarage mean?
 
From the Cat document:

Emergency Standby Power (ESP)​
Output available with varying load for the duration of an emergency
outage. Average power output is 70% of the emergency standby
power rating. Typical operation is 50 hours per year with maximum
expected usage of 200 hours per year. Standby power in accordance
with ISO8528. Fuel stop power in accordance with ISO3046.​
Standby Power​
Output available with varying load for the duration of the interruption
of the normal source power. Average power output is 70% of the
standby power rating. Typical operation is 200 hours per year, with
maximum expected usage of 500 hours per year. Fuel stop power in​
accordance with ISO3046.
Prime Power​
Output available with varying load for an unlimited time. Average
power output is 70% of the prime power rating. Typical peak demand
of 100% of prime-rated ekW with 10% of overload capability for
emergency use for a maximum of 1 hour in 12. Overload operation
cannot exceed 25 hours per year. Prime power in accordance with
ISO8528. Fuel stop power in accordance with ISO3046.​
Continuous Power​
Output available without varying load for an unlimited time. Average
power output is 70 - 100% of the continuous power rating. Typical
peak demand is 100% of continuous rated ekW for 100% of operating
hours. Continuous power is in accordance with ISO8528. Fuel stop​
power in accordance with ISO3046.

Very good link. Thanks Dbuckley.
Steve
 
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