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2
2
400
160
1000
=
=
=
UBase
ZBase
ohm
SBase
EQUATION1960 V1 EN-US
(Equation 450)
2
400
(
)
(
2) 2
20
2
52
5000
ZA Z line
Zsc station
j
j
j ohm
=
+
= +
+
= +
EQUATION1961 V1 EN-US
(Equation 451)
This corresponds to:
2
52
0.0125
0.325
0.325 88
160
j
ZA
j
pu
pu
+
=
=
+
=
Ð °
EQUATION1962 V1 EN-US
(Equation 452)
Set ZA to 0.32.
2
400
(
1)
32
5000
ZB
Zsc station
j
j ohm
=
=
=
EQUATION1963 V1 EN-US
(Equation 453)
This corresponds to:
32
0.20
0.20 90
160
j
ZB
j
pu
pu
=
=
=
Ð °
EQUATION1964 V1 EN-US
(Equation 454)
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 455)
Set ZC to 0.13 and
AnglePhi to 88°
The warning angle (
StartAngle) should be chosen not to cross into normal operating area. The
maximum line power is assumed to be 2000 MVA. This corresponds to apparent impedance:
2
2
400
80
2000
U
Z
ohm
S
=
=
=
EQUATION1967 V1 EN-US
(Equation 456)
Simplified, the example can be shown as a triangle, see figure
Section 7
1MRK 505 343-UEN B
Impedance protection
384
Application manual
Summary of Contents for Relion 670 series
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