R
X
Apparent
impedance at
normal load
Z
C
Z
A
Z
B
anglePhi
IEC07000015_2_en.vsd
IEC07000015 V2 EN-US
Figure 241: Impedances to be set for pole slip protection PSPPPAM (78)
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:
VBase
: 20 kV
SBase set to 200 MVA
X
d
': 25%
1MRK 504 163-UUS A Section 8
Impedance protection
Transformer protection RET670 2.2 ANSI 477
Application manual
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