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End 1
Direction
of load
power flow
test
M
P
S
S/C
1
1
L
P
S
2
2
A phase fuse
removed
A phase fuse
removed
L
P
S
2
2
test
M
P
S
1
1
S/C
End 2
Direction
of load
power flow
LOAD
Figure 4-8
Resultant Applied Voltages and Currents for a Simulated Earth Fault Condition using
©2013 Siemens Protection Devices Limited
test
S/C
test S/C
-ve
test S/C
-ve
test
S/C
Load Current
I
a
53
A phase I/P
54
49
B phase I/P
50
45
C phase I/P
46
25
I
a
Earth-fault I/P
26
dn
79
V
da
80
+ve
81
82
83
dn
79
V
da
80
+ve
81
82
83
26
Earth-fault I/P
25
I
a
46
C phase I/P
45
50
B phase I/P
49
54
A phase I/P
53
I
a
Note that the terminal numbers in this diagram
refer to an Argus AG2-4x5/4x6. The terminals
available on other models may be different,
however, the principle remains the same.
7SG11 Argus User Manual
3 pole directional phase-fault
and directional earth-fault
forward
I
a
reverse
phase-fault element
reverse
forward
= V
+ V
pol
bn
cn
I
a
earth-fault element
3 pole directional phase-fault
and directional earth-fault
= V
+ V
pol
bn
cn
forward
reverse
I
a
phase-fault element
reverse
I
a
forward
earth-fault element
P20006 Page 34 of 37
V
ref
V
pol
V
ref
V
pol
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