ABB REG670 - Page 272

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
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 150.
3
Base
UBase
Z
IBase
=
EQUATION1883 V1 EN
(Equation 150)
The ImpedanceZB is the reverse impedance as show in figure 136. ZB should be equal
to the generator transient reactance X'd. The impedance is given in % of the base
impedance, see equation
150.
Section 8 1MRK 502 071-UEN -
Impedance protection
266 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual