ABB REL670 2.2 IEC - Page 439

R
X
Apparent
impedance at
normal load
Z
C
Z
A
Z
B
anglePhi
IEC07000015_2_en.vsd
IEC07000015 V2 EN-US
Figure 237: Impedances to be set for pole slip protection PSPPPAM
The setting parameters of the
protection are:
Z
A
Block transformer + 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%
Use the following block transformer data:
UBase : 20 kV (low voltage side)
SBase set to 200 MVA
e
k
: 15%
1MRK 506 369-UEN B Section 8
Impedance protection
Line distance protection REL670 2.2 IEC 433
Application manual