7.16.3
Setting guidelines
SEMOD167596-1 v1
SEMOD167582-4 v4
GlobalBaseSel: Selects the global base value group used by the function to define (IBase),
(
UBase) and (SBase).
Operation: With the parameter Operation the function can be set On or Off.
MeasureMode: The voltage and current used for the impedance measurement is set by the
parameter
MeasureMode. The setting possibilities are: PosSeq, L1-L2, L2-L3, or L3-L1. If all
phase voltages and phase currents are fed to the IED the
PosSeq alternative is recommended
(default).
Further settings can be illustrated in figure
.
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 248: Settings for the Pole slip detection function
The
ImpedanceZA is the forward impedance as show in figure
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
1MRK 505 343-UEN B
Section 7
Impedance protection
381
Application manual
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