Required Load Bank

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Besoeker said:
No.
Not if it is rated at 0.8 pf.
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I am flat out gobsmacked by that comment.
100V, 10A at 1.0 PF is 1000W and 1000VA.
100V, 12.5A at .8 PF is 1000W and 1250VA.
All that I am saying is that 12.5 is greater than 10!
And if you wish to exercise the generator to 12.5 A you either have to provide 1250W of prime mover input or use a real reactive load and 1000W of prime mover input.
 
One riddle is if the alternator in a genny operates at lower than its name plate pf 0.8,it is likely to overheat. But this hardly happens in the field.
 
Sahib said:
One riddle is if the alternator in a genny operates at lower than its name plate pf 0.8,it is likely to overheat. But this hardly happens in the field.
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My answer to that riddle is that as long as the limit kVA is respected, increasing the PF of the load should affect only the prime mover, not the generator/alternator. At least to first order anyway.
 
The riddle is concerned with a pf lower than generator name plate pf of 0.8 and not higher and to get first a clarification of it, generator capability curves have to be invoked.
 
Required Load Bank

:) Thanks for all the response, I gained more ideas based on your given information.

We are using IEC standards.

So, therefore load bank is more concerned on the prime mover, which is I think the prime objective of the periodic maintenance is wether the gen set is ready or able to run when it is needed to be during emergency situation that is fault on the main supply.

Appreciate all the comments.

Best regards
 
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