Vx Under/Over Voltage (Vx 27/59); Figure 2-15 Vx Under/Over Voltage - Siemens 7SR21 Manual

2.13.3 Under/Over Voltage (Vx 27/59)
V
X
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:
If DTL setting is small, gradually increase single phase voltage applied to Vx input until element operates if the
element is Overvoltage. Alternatively, if the element is Undervoltage, increase single phase voltage applied to Vx
input until element operates.
If DTL is large, for Overvoltage elements, apply 0.9x setting, check for no operation, apply 1.1x setting, check
operation. For Undervoltage elements, apply 1.1x setting, check for no operation, apply 0.9x setting, check
operation.
Apply 2x setting voltage if possible and record operating time
Starting with the element in the operated condition, gradually increase or decrease the applied voltage until the
element resets. Measure the reset voltage level to check the 27/59 Hysteresis setting.
©2010 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)
)
)
functions are mutually exclusive
27
59
(x4)
27
47
59
(x2)
(x4)
27
59
(x4)
27
59
Optional
79

Figure 2-15 Vx Under/Over Voltage

V (V )
4 X
n/a apply zero current to stabilize other functions
Vx 27/59 - Self Reset
7SR21 & 7SR22 Argus Commissioning and Maintenance
67/ 67/ 81
51V 50 51 HBL
(x4) (x4)
67/ 67/ 81
51V 50 51 HBL
(x4) (x4)
67/ 67/ 81
51V 50 51 HBL
(x4) (x4)
60 67/ 67/ 81
60
CTS- 50N 51N HBL
VTS
I (x4) (x4) 2N
67/ 67/ 81
37G
50G 51G HBL
(x2)
(x4) (x4) 2G
67/ 67/
64 37S
50S 51S
H (x2)
(x4) (x4)
NOTE: The use of some
Note:
Example shows
81
Voltage Config =
(x6)
Van, Vbn, Vcn
59N 74
(x2) TCS
7SR22
51c
2
51c
2
51c
2
Chapter 6 Page 49 of 69