7SR224 Argus Commissioning & Maintenance Guide
©2010 Siemens Protection Devices Limited Chapter 6 Page 58 of 73
3.4 Current Transformer Supervision (60CTS)
7SR224
46
BC
46
NPS
(x2)
37
(x2)
49
50
BF
51V
V
L1
(V
A
)
V
L2
(V
B
)
V
L3
(V
C
)
V
4
(V
X
)
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
60
CTS
60
VTS
I
4
(I
G
/I
SEF
)
74
TCS
(x3)
NOTE: The use of some
functions are mutually exclusive
67/
50
(x4)
67/
51
(x4)
67/
50
(x4)
67/
50
(x4)
67/
51
(x4)
67/
51
(x4)
64
H
27
59
27
59
(x4)
27
59
(x4)
27
59
(x4)
47
(x2)
79
59N
(x2)
Note:
Example shows
Voltage Config =
Van, Vbn, Vcn
81
(x4)
67/
50G
(x4)
67/
51G
(x4)
67/
50S
(x4)
67/
51S
(x4)
27S
59S
27S
59S
27S
59S
Batt
Test
Cap.
Test
Figure 3-4 Current Transformer Supervision
Voltage Inputs: V
L1
(V
A
), V
L2
(V
B
), V
L3
(V
C
)
Current Inputs: I
L1
(I
A
), I
L2
(I
B
), I
L3
(I
C
),
Disable: 51N, 46IT, 46DT, 46BC
Map Pickup LED: 60CTS - Self Reset
The presence of NPS current without NPS voltage is used to indicate a current transformer failure.
Apply normal 3P balanced current with a crossover of any two phases at a level above 60CTS Inps setting.
Measure the delay to operation.
Apply 3P balanced voltage with a similar phase crossover to the current. Increase the applied 3P voltage until the
CTS element resets.
Reduce the 3P voltage to cause CTS operation again. Gradually reduce the 3P current until the element resets.
Setting Measured
60CTS Delay
60CTS Inps
60CTS Vnps
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