ABB Relion 670 series - Page 462

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 234: Settings for the Pole slip detection function
The ImpedanceZA is the forward impedance as show in figure 234. 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 425.
3
Base
UBase
Z
IBase
=
EQUATION1883 V1 EN
(Equation 425)
Section 8 1MRK 506 369-UUS -
Impedance protection
456 Line distance protection REL670 2.2 ANSI
Application manual