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7SR11 & 7SR12 Commissioning and Maintenance Guide
3.2
Voltage Transformer Supervision (60VTS)
I
L1
I
L2
I
L3
Voltage Inputs:
Current Inputs:
Disable:
Map Pickup LED:
3.2.1
1 or 2 Phase VT fail
Apply 3P balanced nominal current and voltage. Reduce 1 phase voltage until VTS operates, record voltage
reduction level.
60VTS V Setting
Increase the voltage until VTS resets. Increase current on 1 phase by 110% of 3x the 60VTS I setting. Reduce
voltage as above and check for no operation. Return voltage to nominal. Increase current on 1 phase by 90% of
3x the 60VTS I setting. Reduce voltage as above and check for VTS operation
60VTS I Setting
©2017 Siemens Protection Devices Limited
37
(x2)
(I
)
A
37
(x2)
(I
)
B
37
(x2)
(I
)
C
46
BC
I
(I
)
4
G
27
V
(V
)
59
L1
A
(x4)
27
V
(V
)
59
L2
B
(x4)
27
V
(V
)
59
L3
C
(x4)
Figure 2-23
Voltage Transformer Supervision
V
(V
), V
(V
L1
A
L2
B
I
(I
), I
(I
), I
L1
A
L2
B
27, 47, 59N
60VTS - Self Reset
Setting x 3
Setting x 3
67/
67/
50
49
51V
50
51
BF
(x4)
(x4)
67/
67/
50
49
51V
50
51
BF
(x4)
(x4)
67/
67/
50
49
51V
50
51
BF
(x4)
(x4)
46
67/
67/
60
60
NPS
50N
51N
CTS
VTS
(x2)
(x4)
(x4)
67/
67/
50
50
51
BF
SEF
SEF
NOTE: The use of some
functions are mutually exclusive
47
81
59N
(x2)
(x6)
(x2)
Optional
79
), V
(V
)
L3
C
(I
),
L3
C
110% of Setting x 3
No VTS □
7SR12
81
HBL
51c
2
81
HBL
51c
2
81
HBL
51c
2
64H
Note:
Example shows
Voltage Config =
Van, Vbn, Vcn
74
T/
CCS
Measured Voltage Reduction
90% of Setting x 3
VTS operation □
Chapter 6 Page 62 of 72
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