R
X
Apparent
impedance at
normal load
Z
C
Z
A
Z
B
anglePhi
IEC07000015_2_en.vsd
IEC07000015 V2 EN-US
Figure 250: Impedances to be set for pole slip protection
The setting parameters of the protection is:
Z
A
:
Line + source impedance in the forward direction
Z
B
:
The source impedance in the reverse direction
Z
C
:
The line impedance in the forward direction
AnglePhi:
The impedance phase angle
Use the following data:
UBase: 400 kV
SBase set to 1000 MVA
Short circuit power at station 1 without infeed from the protected line: 5000 MVA (assumed to a
pure reactance)
Short circuit power at station 2 without infeed from the protected line: 5000 MVA (assumed to a
pure reactance
Line impedance: 2 + j20 ohm
With all phase voltages and phase currents available and fed to the protection IED, it is
recommended to set the
MeasureMode to positive sequence.
The impedance settings are set in pu with ZBase as reference:
1MRK 505 343-UEN B
Section 7
Impedance protection
383
Application manual
Summary of Contents for Relion 670 series
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