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Nipper01
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Join Date: Oct 2010
Posts: 7

Power Factor of Induction Generator

10/18/2010 10:06 AM

The power factor of a 3 phase induction motor improves significantly with load. If the same motor is driven by a prime mover above synchronous speed becoming a generator does the power factor improve as the generator load increases?
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kvsridhar
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#1

Re: Power Factor of Induction Generator

10/18/2010 10:53 AM

This is a generator you are talking about isn't it ? Its PF will be decided entirely by the type of load on it ... yes? A pure resistor will make PF=1 while a capacitor will make it zero ....

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Nipper01
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Join Date: Oct 2010
Posts: 7
#2
In reply to #1

Re: Power Factor of Induction Generator

10/18/2010 2:46 PM

I am not an electrical engineer (obviously) but I understand that an induction motor excited by the utility grid and mechanically driven above synchronous speed acts as a generator but has a bad power factor due to the fact that the grid utility must supply the reactive kvars to magnetise the rotor while the generator supplies power to the grid. This bad pf will incur a penalty from the utility company purchasing the electricity.
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PWSlack
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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#3
In reply to #2

Re: Power Factor of Induction Generator

10/19/2010 4:07 AM

If it's uneconomic, don't do it, then.

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Nipper01
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Join Date: Oct 2010
Posts: 7
#4
In reply to #3

Re: Power Factor of Induction Generator

10/19/2010 5:15 AM

I was hoping for a serious technical response, so far none received! It is not uneconomic to do this but choosing the correct size and type of induction motor obviously has a large effect on the yield. Please read the question or do not bother to respond with meaningless one liners.
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kvsridhar (1); Nipper01 (2); PWSlack (1)

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