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Generator protection : Loss Of Field

Generator protection : Loss Of Field

Generator protection : Loss Of Field

(OP)
G'Day,

I am dealing with setting schedule for generator protection.
For LOF (ANSI 40) one customer request to get the protection locus among the P/Q capability diagram.

What I get used to is to compute and draw the characteristic within the R/X diagram.

Do you have experience with the P/Q diagram for LOF?
Any reference to share regarding LOF and P/Q diagram?

Thank you.

 

RE: Generator protection : Loss Of Field

I believe J. L. Blackburn's Protective Relaying book covers translation between P/Q and R/X representations.   

 

David Castor
www.cvoes.com

RE: Generator protection : Loss Of Field

(OP)
Thank you David.
I will refer to Blackburn when back in Office.
Is such kind of drawing usual in US ?

Regards.

RE: Generator protection : Loss Of Field

Generally the generator manufacturer provides a P-Q diagram.  The relays are usually set by R-X, so sometimes we have to correlate the two.  

 

David Castor
www.cvoes.com

RE: Generator protection : Loss Of Field

Here's an example of a rotor winding failure i.e. a total loss of excitation. This is from a real fault of an 18 MVA generator. Just the P, Q and f were recorded with 50 samples per second. There is no change in the active power at the moment the field diappears!

http://files.engineering.com/getfile.aspx?folder=50f3ec3a-b585-43b2-a500-f248c6e16a7f&file=RotorWindingFailure.ppt
 

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