background network. Theoretically, the measured admittance is located in the first
quadrant in the admittance plane, see
.
Im(Yo)
Re(Yo)
Forward
fault,
ungrounded
network:
Yo
≈
j*(I
eTot
‐
I
eFd
)/U
ph
Forward
fault,
compensated
network:
Yo
≈
(I
rcc
+
j*(I
eTot
*(1
‐
K)
‐
I
eFd
))/U
ph
Under
‐
comp.
(K<1)
Resonance
(K=1)
Over
‐
comp.
(K>1)
Reverse
fault:
Y o
≈ ‐
j*I
eFd
/U
ph
Forward fault,
high resistance earthed network:
Yo
≈
(I
Rn
+j*(I
eTot
‐
I
eFd
))/U
ph
~
~
~
A
B
C
E
A
E
B
E
C
Io
Forward
Fault
L
cc
R
cc
I
eFd
I
eTot
(I
eTot
‐
I
eFd
)
Uo
R
n
Protected
feeder
Background network
Y
Fd
Y
Bg
VG
Vph
Vph
Vph
Vph
IG
GUID-99A93925-B7EF-4154-A90B-AE3DFC3ABFA1 V1 EN
Figure 177:
Admittance calculation during a forward fault
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
379
Technical Manual
Summary of Contents for Relion 615 series
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