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saqqaf48
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Join Date: Oct 2011
Posts: 2

Generator Excitation Current & Power Factor

10/05/2011 6:45 AM

Our Steam Tubine Generator Exciatation current suddenly drops and Power factor variation occurred from 0.96 to -0.99 . Excitation current automatically restores after Manually power factor adjustment.

Please let me know what type of is like problems.

I have replaced AVR , DRoop CT, Diode and all related Relays. If there is any thing Generator side to check as I have done Megger Generator parts. But fault still persists. Could anyone guide me to check any thing else in the cicrcuit.
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hithuanand
Power-User
India - Member - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Apr 2010
Location: Asia/India
Posts: 365
Good Answers: 1
#1

Re: Generator Excitation Current & Power Factor

10/05/2011 10:44 AM

What kind of powerfactor noload or full load?
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saqqaf48
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Join Date: Oct 2011
Posts: 2
#3
In reply to #1

Re: Generator Excitation Current & Power Factor

10/11/2011 7:27 AM

Power factor at Load , Parallel with Grid..
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RAMConsult
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Engineering Fields - Power Engineering - New Member

Join Date: May 2007
Location: NYC metropolitan area.
Posts: 3230
Good Answers: 444
#2

Re: Generator Excitation Current & Power Factor

10/05/2011 1:09 PM

We need more info.

1. Isolated generator or grid-connected,

2. Size and type of load in relation to generator rating,

3, Is load relatively constant or do they switch on and off randomly,

4. Are there any long feeds to the loads?

Please note that the AVR (Automatic Voltage Regulator) is not a PFC (Power Factor Controller), the AVR is there to keep the generator terminal voltage at a fixed level by varying the excitation current, not the other way around. Also it is the nature of the load(s) that determine the power factor that the generator sees.

__________________
 “Tell me and I forget. Teach me and I remember. Involve me and I learn.” Ben Franklin.
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