Siemens Argus 7SR21 Technical Manual page 581
Overcurrent relay
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3.3
Current Transformer Supervision. (60CTS)
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:.
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.
© 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 3.3-1
Current Transformer Supervision
V
(V
), V
(V
), V
L1
A
L2
B
I
(I
), I
(I
), I
L1
A
L2
B
L3
51N, 46IT, 46DT, 46BC
60CTS - Self Reset
7SR210 & 7SR220 Commissioning & Maintenance Guide
7SR22
60
67/
67/
21
CTS-
51V
50
51
FL
I
(x4)
(x4)
67/
67/
60
21
51V
50
51
CTS-
FL
I
(x4)
(x4)
67/
67/
60
21
51V
50
51
CTS-
FL
(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
(V
) for directional elements.
L3
C
(I
),
C
81
51c
HBL
2
81
51c
HBL
2
81
51c
HBL
2
81
HBL
2N
37G
(x2)
37S
(x2)
Page 69 of 82
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