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:
2 2
400
160
1000
= = =
UBase
ZBase ohm
SBase
EQUATION1960 V1 EN-US (Equation 144)
2
400
( ) ( 2) 2 20 2 52
5000
ZA Z line Zsc station j j j ohm= + = + + = +
EQUATION1961 V1 EN-US (Equation 145)
This corresponds to:
2 52
0.0125 0.325 0.325 88
160
j
ZA j pu pu
+
= = + = Ð °
EQUATION1962 V1 EN-US (Equation 146)
Set ZA to 0.32.
2
400
( 1) 32
5000
ZB Zsc station j j ohm= = =
EQUATION1963 V1 EN-US (Equation 147)
This corresponds to:
32
0.20 0.20 90
160
j
ZB j pu pu= = = Ð °
EQUATION1964 V1 EN-US (Equation 148)
Set ZB to 0.2
This corresponds to:
2 20
0.0125 0.125 0.126 84
160
j
ZC j pu pu
+
= = + = Ð °
EQUATION1966 V1 EN-US (Equation 149)
Set ZC to 0.13 and AnglePhi to 88°
Section 8 1MRK 502 071-UUS A
Impedance protection
288 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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