ZC
ZA
ZB
en07000017.vsd
IEC07000017 V1 EN-US
Figure 252: Generator application of pole slip protection
If the apparent impedance crosses the impedance line ZB – ZA this is the detected criterion of
out of step conditions, see figure
R
X
Apparent
impedance at
normal load
Z
C
Z
A
Z
B
anglePhi
IEC07000015_2_en.vsd
IEC07000015 V2 EN-US
Figure 253: Impedances to be set for pole slip protection PSPPPAM
The setting parameters of the protection are:
Z
A
Block trans source impedance in the forward direction
Z
B
The generator transient reactance
Z
C
The block transformer reactance
AnglePhi
The impedance phase angle
Use the following generator data:
UBase: 20 kV
SBase set to 200 MVA
X
d
': 25%
Section 7
1MRK 505 343-UEN B
Impedance protection
386
Application manual
Summary of Contents for Relion 670 series
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