Measured Earth Fault (67/50G,67/51G) - Siemens 7SR224 Technical Manual

2.6

Measured Earth fault (67/50G,67/51G)

I
(I /I
G
V
(V
V
(V
V
(V
(V
Figure 2-7 Measured Earth Fault
Voltage Inputs:
Current Inputs:
Disable: 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.
The operating current source for these elements is selectable and may be either measured directly on current
input I or the calculated residual current derived from the sum of current inputs I
4
by the 50/51G Measurement setting in the Measured E/F sub-menu of the Current Prot'n menu. Tests must be
applied using the correct analogue inputs.
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
50S
H
4 (x4)
)
SEF
*
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 (I -I ) or I (I ) (selectable)
L1 L3 A c 4 G
51G-n/50G-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
* *
67/ 67/
60
50G 51G
VTS
(x4) (x4)
* *
67/ 67/ 67/
51S 50G 51G
(x4) (x4) (x4)
NOTE: The use of some functions are mutually exclusive.
67/51G(x4) can be selected as I or derived from I -I
4 L1 L3
Note:
Example shows
Voltage Config =
47
81 Van, Vbn, Vcn
(x2) (x4)
74
59N Batt
TCS
(x2) Test
(x3)
Cap.
79
Test
(V ) for directional elements
C
–I
L1 L3
. This selection is specified
Chapter 6 Page 25 of 73