ABB RELION 670 SERIES REG670 - Page 290

IEC06000548_2_en.vsd
IED
B A
E
B
E
A
X’
d
X
T
Z
S
Zone 1 Zone 2
jX
R
ZB
ZA
Pole slip
impedance
movement
Zone 2
Zone 1
WarnAngle
TripAngle
f
ZC
IEC06000548 V2 EN-US
Figure 136: Settings for the Pole slip detection function
The ImpedanceZA is the forward impedance as show in figure
136. ZA should be the
sum of the transformer impedance XT and the equivalent impedance of the external
system ZS. The impedance is given in % of the base impedance, according to
equation 143.
3
Base
UBase
Z
IBase
=
EQUATION1883 V1 EN-US (Equation 143)
Section 8 1MRK 502 071-UUS A
Impedance protection
284 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual