Setting Example For Generator Application - ABB RELION 670 SERIES REG670 Applications Manual

Section 8
Impedance protection
8.4.3.2
290
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.

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).
ZB
IEC07000017 V1 EN-US
Figure 140: 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 141.
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
ZA
ZC
1MRK 502 071-UUS A
SEMOD172162-90 v4
en07000017.vsd
Application manual