Nps Overvoltage (47); Figure 2-16 Nps Overvoltage - Siemens 7SR21 Manual

2.13.4 NPS Overvoltage (47)

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:
Where two NPS elements are being used with different settings, it is convenient to test the elements with the
highest settings first. The elements with lower settings can then be tested without disabling the lower settings.
NPS Overvoltage can be tested using a normal 3P balanced source. Two phase voltage connections should be
reversed so that the applied balanced 3P voltage is Negative Phase Sequence.
If the 47-n delay is small, gradually increased the applied balanced 3P voltage until element operates.
If DTL is large apply 0.9x setting, check for no operation, apply 1.1x setting, and check operation
Apply 2x setting current if possible and record operating time
©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 2-16 NPS Overvoltage

V (V ), V (V
L1 A L2 B
n/a apply zero current to stabilize other functions
27/59, 59N, 60VTS
47-n - Self Reset
7SR21 & 7SR22 Argus Commissioning and Maintenance
67/ 67/
51V 50 51
(x4) (x4)
67/ 67/
51V 50 51
(x4) (x4)
67/ 67/
51V 50 51
(x4) (x4)
60 67/ 67/
60
CTS- 50N 51N
VTS
I (x4) (x4)
67/ 67/ 81
50G 51G HBL
(x4) (x4) 2G
67/ 67/
64
50S 51S
H
(x4) (x4)
NOTE: The use of some
Note:
Example shows
81
Voltage Config =
(x6)
Van, Vbn, Vcn
59N 74
(x2) TCS
), V (V )
L3 C
7SR22
81
51c
HBL
2
81
HBL 51c
2
81
HBL 51c
2
81
HBL
2N
37G
(x2)
37S
(x2)
Chapter 6 Page 51 of 69