Sensitive Earth Fault (67/50S,67/51S) - Siemens 7SR224 Technical Manual

2.7

Sensitive Earth fault (67/50S,67/51S)

I
(I /I
G
V
(V
V
(V
V
(V
(V
Figure 2-8 Sensitive Earth Fault
Voltage Inputs:
Current Inputs:
Disable: 64H, 50CBF, 79
Map Pickup LED:
Other protection functions may overlap with these functions during testing, it may be useful to disable some
functions to avoid ambiguity. Measured EF, Sensitive EF & Restricted EF protections can be Enabled/Disabled
individually or as groups in the 'Function Config' menu.
If any of these elements are defined as directional the correct voltage phase direction will be required to produce
an operation of those elements.
©2010 Siemens Protection Devices Limited
37 50
49
(x2) BF
I
L1
(I )
A
37 50
49
(x2) BF
I
L2
(I )
B
37 50
49
(x2) BF
I
L3
(I )
C
46
46 60
NPS
BC CTS
(x2)
67/
64
50G
H
4 (x4)
)
SEF
NOTE: The use of some
functions are mutually exclusive
27
27S
L1
59
) 59S
A
(x4)
27
27S
L2
59
) 59S
B
(x4)
27
27S
L3
59
) 59S
C
(x4)
V 27
4
) 59
X
V (V ), V (V ), V
L1 A L2 B L3
I (I )
4 SEF
51SEF-n/50SEF-n - Self Reset
7SR224 Argus Commissioning & Maintenance Guide
7SR224
67/ 67/ 81
51V 50 51 HBL
(x4) (x4) 2
67/ 67/ 81
51V 50 51 HBL
(x4) (x4) 2
67/ 67/ 81
51V 50 51 HBL
(x4) (x4) 2
60
VTS
67/ 67/ 67/
51G 50S 51S
(x4) (x4) (x4)
Note:
Example shows
Voltage Config =
47
81 Van, Vbn, Vcn
(x2) (x4)
74
59N Batt
TCS
Test
(x2)
(x3)
Cap.
79
Test
(V ) for directional elements
C
Chapter 6 Page 29 of 73