Pole slip protection/ calculations
Pole slip protection/ calculations
(OP)
HI Folks
anyone know good websites where i can get info on pole slip and then on calculations for settings?
many thanks
anyone know good websites where i can get info on pole slip and then on calculations for settings?
many thanks
Flashover






RE: Pole slip protection/ calculations
The setting of the 78 is not simple because it protects the generator against loss of steps caused by electromechanical transients that could occur in a grid.
So a transient stability study only can give you the necessary information for the 78 setting. But usually the data of the grid are unknown.
I could describe you my thumb rule:
1- suppose that you are measuring the system impedance at the generator terminals.
2- the segment AB of the system is composed by the gen impedance AC, the step-up transformer impedance CD and the Grid (equivalent) impedance DB. AB = AC+CD+DB
3- the AC segment is in the third quadrant of the (R,X) space and its length is the transient impedance of the gen.
4- The CD segment is in the 1st quadrant and its length is the transf impedance
5- the DB segment is in the 1st quadrant and could be about 3 times CD (DB=3*CD)
now you have the representation of your system in the impedance loci.
You have to define the characteristic of the protection (lenticular, bouble bindings...) But this setting of the protection depends on the protection itself, because each manufacturer propose a different algorythm (see the differences between the GE LPSO and the ABB REG316, I prefer the last one).
Sorry, I cannot help you anymore without further information.
Alex68
RE: Pole slip protection/ calculations
This might be available on the www.areva-td.com website.
Also try the NPAG page of the same website - it has a generator protection section with information on pole slip protection too.
RE: Pole slip protection/ calculations
www.geindustrial.com