7SG11 Argus User Manual
©2013 Siemens Protection Devices Limited
P20006 Page 23 of 37
V
RES
I
RES
C.A.
Apply residual voltage either directly to input or
by reducing voltage of faulted phase.
Adjust the phase angle of the residual current
relative to the voltage:
Verify directional pick-up and drop off at points
A, B, C and D
Alternatively,
Verify correct directional indication at points a,
b, c and d (C.A +80
0
, +100
0
, -80
0
, -100
0
)
A
B
D
C
a
d
b
c
FWD
REV
-30
0
-60
0
-90
0
180
0
+90
0
+120
0
+150
0
0
0
Figure 4-1
Directional Earth Fault Boundary System Angles
V
C
V
B
V
A
I
A
90
0
- C.A.
With balanced 3-phase system quantities:
Adjust the phase angle of the currents
relative to the voltages:
Verify directional pick-up and drop off at
points A, B, C and D
Alternatively,
Verify correct directional indication at points
a, b, c and d (C.A +80
0
, +100
0
, -80
0
, -100
0
)
A
B
D
C
a
d
b
c
FWD
REV
-30
0
-60
0
-90
0
180
0
+90
0
+120
0
+150
0
0
0
Figure 4-2
Directional Phase Fault Boundary System Angles
Table 4-3
Limits of Operate Pick-up Relay Angle Boundaries
Pole CA
Direction
Operate (PU)
limits (I wrt V)
Pole CA
Direction
Operate (PU)
limits (I wrt V)
forward lag
-37.5
-47.5
forward lag
-127.5 -137.5
forward lead
127.5
137.5
forward lead
37.5
47.5
reverse lead
-42.5
-52.5
reverse lead
-132.5 -142.5
+45
reverse lag
132.5
142.5
-45
reverse lag
42.5
52.5
forward lag
-52.5
-62.5
forward lag
-147.5 -157.5
A,B,C
+30
forward lead
112.5
122.5
E/F
-65
forward lead
17.5
27.5