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2.8
Measured Earth fault (67/50G,67/51G)
I
L1
I
L2
I
L3
Voltage Inputs:
Current Inputs:
Disable:
Map Pickup LED:
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
input circuit only.
4
If any of these elements are defined as directional the correct voltage phase direction will be required to produce
an operation of those elements.
©2017 Siemens Protection Devices Limited
37
(x2)
(I
)
A
37
(x2)
(I
)
B
37
(x2)
(I
)
C
46
BC
I
(I
)
4
G
27
V
(V
)
59
L1
A
(x4)
27
V
(V
)
59
L2
B
(x4)
27
V
(V
)
59
L3
C
(x4)
Figure 2-9
V
(V
), V
(V
L1
A
L2
B
I
(I
)
4
G
50CBF, 79
51G-n/50G-n - Self Reset
7SR11 & 7SR12 Commissioning and Maintenance Guide
67/
67/
50
49
51V
50
51
BF
(x4)
(x4)
67/
67/
50
49
51V
50
51
BF
(x4)
(x4)
67/
67/
50
49
51V
50
51
BF
(x4)
(x4)
46
67/
67/
60
60
NPS
50N
51N
CTS
VTS
(x2)
(x4)
(x4)
67/
67/
50BF
50G
51G
(x4)
(x4)
NOTE: The use of some
functions are mutually exclusive
47
81
59N
(x2)
(x4)
(x2)
Optional
79
Measured Earth Fault
), V
(V
) for directional elements
L3
C
7SR12
81
HBL
51c
2
81
HBL
51c
2
81
HBL
51c
2
64H
Note:
Example shows
Voltage Config =
Van, Vbn, Vcn
74
T/
CCS
Chapter 6 Page 29 of 72
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