So whats my actual generator rating?

[Knobhead]

I can’t understand this argument.
640KVA 415V @ unity PF = 890A
520KVA 415V @ 0.8 PF = 868A
As near as damn it 900A

 

[sheephat]

The altitude and the ambient tempurature must surely be irrelevant how can it affect the generator rating that much, beside lets pretend we have ideal conditions.

@Rockingit - I wanted to turn the load bank up and take over the whole testing process but they wouldnt let me lol.

 

[1capybara]

640 kva @ 80% pf = 520 kw, actual usable power.
but I like the duel at dawn method with alternator plates. or the rock and roll method

 

[Engineer54]

640 kva @ 80% pf = 520 kw, actual usable power.
but I like the duel at dawn method with alternator plates. or the rock and roll method

No-ones trying to dis you...

But i can assure you, that if an alternator has a a current value stated on it's data plate, then that alternator should be expected to be able to provide that current.. You can play with KW and KVA designations all day, but they will both be based on the capability on what the alternators current output has been designed to deliver. As stated previously, the generator will not care a jot what that current is made up from, it will still provide that stated current, ...be it useful current or otherwise.

As for the ambient temperature and altitude, were talking about an in-situ generator installation in a UK City, so the altitude can be ruled out. As for ambient temperature, ...well that is clearly fine going by the test report readings... So let's take it that in this case, both are well within the manufacturers design thresholds, and that no de-rating factors need to be applied.