Derived Earth Fault (67/50N, 67/51N) - Siemens Argus 7SR21 Technical Manual

2.3

Derived Earth Fault (67/50N, 67/51N)

I
L1
(I )
A
I
L2
(I )
B
I
L3
(I )
C
I
4
(I )
G
I
5
(I )
SEF
V
L1
(V )
A
V
L2
(V )
B
V
L3
(V )
C
V
4
(V )
X
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.
Derived EF elements can be separated from Measured EF and sensitive EF by arrangement of the secondary
injection circuit by shorting/disconnecting I
If any of these elements are defined as directional the correct voltage phase direction will be required to produce
an operation of those elements.
© 2013 Siemens Protection Devices Limited
37 50
49
(x2) BF
37 50
49
(x2) BF
37 50
49
(x2) BF
46
46 60
NPS
BC CTS
(x2)
50
37
BF
50
37
BF
NOTE: The use of some
functions are mutually exclusive
27
59
(x4)
27
47
59
(x2)
(x4)
27
59
(x4)
27
59
Optional
79 25
Figure 2.3-1
V (V ), V (V ), V
L1 A L2 B
I (I ), I (I ), I
L1 A L2 B L3
37, 46, 49, 60CTS, 50BF, 60CTS, 46BC, 79
51N-n/50N-n - Self Reset
and I inputs.
4 5
7SR210 & 7SR220 Commissioning & Maintenance Guide
7SR22
60 67/ 67/
50
CTS- 51V 50 51
AFD
I (x4) (x4)
67/ 67/
60
50
51V 50 51
CTS-
AFD
I (x4) (x4)
67/ 67/
60
50
51V 50 51
CTS-
AFD
(x4) (x4)
I
67/ 67/
60
50N 51N
51c
VTS
(x4) (x4)
67/ 67/
50G 51G
(x4) (x4)
67/ 67/
64
50S 51S
H
(x4) (x4)
81
(x6)
59N 74
(x2) TCS
Derived Earth Fault
(V )
L3 C
(I ),
C
81
51c HBL
2
81
51c HBL
2
81
51c HBL
2
81
HBL
2N
37G
(x2)
37S
(x2)
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