ABB Relion 670 series - Setting Example for Generator Application

Set StartAngle to 110°
For the TripAngle it is recommended to set this parameter to 90° to assure limited stress
for the circuit breaker.
In a power system it is desirable to split the system into predefined parts in case of pole
slip. The protection is therefore situated at lines where this predefined split shall take
place.
Normally the N1Limit is set to 1 so that the line will be tripped at the first pole slip.
If the line shall be tripped at all pole slip situations also the parameter N2Limit is set to 1.
In other cases a larger number is recommended.
8.16.3.2 Setting example for generator application
In case of out of step conditions this shall be checked if the pole slip centre is inside the
generator (zone 1) or if it is situated in the network (zone 2).
ZC
ZA
ZB
en07000017.vsd
IEC07000017 V1 EN
Figure 238: Generator application of pole slip protection
If the apparent impedance crosses the impedance line ZB – ZA this is the detected criterion
of out of step conditions, see figure 239.
Section 8 1MRK 506 369-UUS -
Impedance protection
462 Line distance protection REL670 2.2 ANSI
Application manual