ABB RELION 670 Series Applications Manual page 373

1MRK 504 152-UEN B
IEC07000017 V1 EN-US
Figure 227: 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 228.
IEC07000015 V2 EN-US
Figure 228: Impedances to be set for pole slip protection PSPPPAM
The setting parameters of the protection are:
Z
A
Z
B
Z
C
AnglePhi
Use the following generator data:
UBase : 20 kV
SBase set to 200 MVA
X ': 25%
d
Application manual
ZB
ZC
X
Z
B
ZA
Z
A
Z
C
anglePhi
Block transformer + source impedance in the forward direction
The generator transient reactance
The block transformer reactance
The impedance phase angle
Impedance protection
en07000017.vsd
Apparent
impedance at
normal load
R
IEC07000015_2_en.vsd
Section 7
367