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Eng. Waleed
Member

Join Date: Nov 2010
Posts: 6

Stability Limit

01/14/2011 4:12 AM

Hi all

Can any one explain how can I draw the stability limit in under excitation protection?

(the red line in the image)
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Anonymous Poster
#1

Re: stability limit

01/14/2011 4:27 AM

CR4 ADMIN: Deleted Post

Abuse/Attack: This post was deleted because it was an attack on another user. Please review the CR4 Site FAQ and the CR4 Rules of Conduct.
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Eng. Waleed
Member

Join Date: Nov 2010
Posts: 6
#4
In reply to #1

Re: stability limit

01/14/2011 8:40 AM

CR4 ADMIN: Deleted Post

Irrelevant This post was deleted because it is related to a deleted post and would otherwise be taken out of context.
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Anonymous Poster
#8
In reply to #1

Re: stability limit

01/16/2011 12:02 AM

There was nothing as attack. Nobody in anypart of the world use the title Engineer in front of his name.
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Anonymous Poster
#2

Re: stability limit

01/14/2011 5:19 AM

I would, but I can't get excited about it.
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TonyS
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Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
Good Answers: 181
#3

Re: Stability Limit

01/14/2011 8:07 AM

Me too, definitely under excited!

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67model
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Join Date: Dec 2010
Posts: 1686
Good Answers: 116
#5

Re: Stability Limit

01/14/2011 5:55 PM

Look in a textbook! It is usually determined by a 10% rated MW increase margin before loss of synchronism.
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Eng. Waleed
Member

Join Date: Nov 2010
Posts: 6
#6
In reply to #5

Re: Stability Limit

01/14/2011 7:05 PM

thank you for reply

but as I see this is Refracted Line, is there any equation represent it ?

thank you again
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67model
Guru

Join Date: Dec 2010
Posts: 1686
Good Answers: 116
#7
In reply to #6

Re: Stability Limit

01/15/2011 5:53 AM

You need to refer to the textbook for the value of synchronising torque and power. Why would you operate at leading power factor? A good AVR, with under-excitation limiter and correct settings, will keep you away from loss of sync. If you have a chart for the +Q area, which is properly drawn and accurate, you can graphically construct the -Q part.
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67model (2); Anonymous Poster (3); Eng. Waleed (2); TonyS (1)

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