Siemens 7SR12 Argus - Measured Earth Fault (67;50 G,67;51 G)

7SR11 & 7SR12 Commissioning and Maintenance Guide
©2017 Siemens Protection Devices Limited Chapter 6 Page 29 of 72
2.8 Measured Earth fault (67/50G,67/51G)
7SR
12
46
BC
46
NPS
(x2)
37
(x2)
49
50
BF
51V
V
L1
(V
A
)
V
L2
(V
B
)
V
L3
(V
C
)
I
L1
(I
A
)
81
HBL
2
37
(x2)
49
50
BF
51V
I
L2
(I
B
)
81
HBL
2
37
(x2)
49
50
BF
51V
I
L3
(I
C
)
81
HBL
2
I
4
(I
G
)
74
T/
CCS
NOTE: The use of some
functions are mutually exclusive
67/
50
(x4)
67/
51
(x4)
67/
50N
(x4)
67/
50
(x4)
67/
50
(x
4)
67/
51
(x
4
)
67/
51
(
x4)
67/
51N
(x4)
67/
50G
(x4)
67/
51G
(x4)
27
59
(x4)
27
59
(x4)
27
59
(x4)
79
Optional
Note:
Example shows
Voltage Config =
Van, Vbn, Vcn
60
CTS
60
VTS
50BF
64H
51c
51c
51c
47
(x2)
59N
(x2)
81
(x4)
Figure 2-9 Measured Earth Fault
Voltage Inputs: V
L1
(V
A
), V
L2
(V
B
), V
L3
(V
C
) for directional elements
Current Inputs: I
4
(I
G
)
Disable: 50CBF, 79
Map Pickup LED: 51G-n/50G-n - Self Reset
Other protection functions may overlap with these functions during testing, it may be useful to disable some
functions to avoid ambiguity. Derived EF, Measured EF, Sensitive EF & Restricted EF protections can be
Enabled/Disabled individually or as groups in the ‘Function Config’ menu.
Measured EF elements can be separated from Derived EF and Sensitive EF by secondary injection of current
through the I
4
input circuit only.
If any of these elements are defined as directional the correct voltage phase direction will be required to produce
an operation of those elements.