Generator Kw

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Nxtu

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I have an AC Generator Rated 400 KW /230 V /60HZ /3Ph .If I change its voltage configuration from 220V to 460 V.
Is this change effect the KW and How it can be Calculated ....?
Thanks
 
Nxtu said:
I have an AC Generator Rated 400 KW /230 V /60HZ /3Ph .If I change its voltage configuration from 220V to 460 V.
Is this change effect the KW and How it can be Calculated ....?
Thanks
Click to expand...

KW will stay the same, your output amperage will be reduced from 1200 amps to 600amps.

If you were really setup for 208 then you were at just under 1400amps.

Is there a breaker on the unit??
 
Nxtu said:
I have an AC Generator Rated 400 KW /230 V /60HZ /3Ph .If I change its voltage configuration from 220V to 460 V.
Is this change effect the KW and How it can be Calculated ....?
Thanks
Click to expand...


In theory, real power KW it is not affected by changing the generator output voltage. The following equation is used to calculate Real power KW as follows:

Real Power KW=sqrt(3)*Voltage*Current*Power Factor

Typically, power factor for generator is between 0.8 - 0.85.

Remember, generator real power KW and power factor are constant in this equation. The relationship between voltage and current its what is affected by changing the output voltage as follows:

Current = KW/[sqrt(3)*voltage*p.f]

So, for small voltage high current and for high voltage low current.

As explained by jrannis, you should consider the breaker size of the unit and service feeders for the different connections.
 
Generators only have one thing to worry about - heat. To be more presicw heat of the windings and bearings (from the simple side).
 
fjrivera said:
In theory, real power KW it is not affected by changing the generator output voltage. The following equation is used to calculate Real power KW as follows:

Real Power KW=sqrt(3)*Voltage*Current*Power Factor
Click to expand...
Strictly that gives W, not kW.
:wink:
 
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