Operating Zones - ABB REG670 Applications Manual

Section 8
Impedance protection
8.9.2.1
310

Operating zones

Z3Fwd
Z2Fwd
ImpedanceAn
g
ImpedanceAn
Z3Rev
g
Z2Rev
IEC11000308 V3 EN
Figure 165: Zone characteristics and typical power system model
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Zone3
Zone2
Zone1
Y/Y
REG670
A) Power system model
ImpedanceAn
Z1Rev
B) Typical setting of zones for under
impedance relay
1MRK 502 071-UEN -
D/Y
Z1Fwd
g
R(ohm)
IEC11000308-3-en.vsd
Application manual