Nps Overvoltage (47) - Siemens 7SR224 Technical Manual

2.12.4 NPS Overvoltage (47)

I
(I /I
G
V
(V
V
(V
V
(V
(V
Figure 2-15 NPS Overvoltage
Voltage Inputs:
Current Inputs:
Disable: 27/59, 59N, 60VTS
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. For relay applications on non
standard networks with positive phase sequence A-C-B, NPS voltage is provided by a 3 phase source with
conventional A-B-C 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, check operation
Apply 2x setting current if possible and record operating time
Phas 27/59 U/O
e setting
(Volts)
NPS
©2010 Siemens Protection Devices Limited
37 50
49
(x2) BF
I
L1
(I )
A
37 50
49
(x2) BF
I
L2
(I )
B
37 50
49
(x2) BF
I
L3
(I )
C
46
46 60
NPS
BC CTS
(x2)
67/
64
50G
H
(x4)
4
)
SEF
NOTE: The use of some
functions are mutually exclusive
27
27S
L1
59
) 59S
A
(x4)
27
27S
L2
59
) 59S
B
(x4)
27
27S
L3
59
) 59S
C
(x4)
V 27
4
) 59
X
V (V ), V (V ), V
L1 A L2 B L3
n/a apply zero current to stabilize other functions
47-n - Self Reset
DTL Hyst. D.O.
(sec) (calculated)
7SR224 Argus Commissioning & Maintenance Guide
7SR224
67/ 67/ 81
51V 50 51 HBL
(x4) (x4) 2
67/ 67/ 81
51V 50 51 HBL
(x4) (x4) 2
67/ 67/ 81
51V 50 51 HBL
(x4) (x4) 2
60
VTS
67/ 67/ 67/
51G 50S 51S
(x4) (x4) (x4)
Note:
Example shows
Voltage Config =
47 81 Van, Vbn, Vcn
(x2)
(x4)
74
59N Batt
TCS
(x2) Test
(x3)
Cap.
79
Test
(V )
C
P.U. D.O Op. Time
Volts Volts 2x Vs
NOTES
Chapter 6 Page 47 of 73