Negative Phase Sequence Overcurrent (46Nps) - Siemens 7SR224 Technical Manual

2.9 Negative Phase Sequence Overcurrent
I
(I /I
G
V
(V
V
(V
V
(V
(V
Figure 2-10 Negative Phase Sequence Overcurrent
Voltage Inputs:
Current Inputs:
Disable: 51, 51V, 51C, 37, 49, 50CBF, 60CTS, 46BC
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.
The Thermal withstand limitations of the current inputs, stated in the Performance Specification should always be
observed throughout testing.
NPS Overcurrent can be tested using a normal 3P balanced source. Two phase current connections should be
reversed so that the applied balanced 3P current is Negative Phase Sequence. For relay applications on non
standard networks with positive phase sequence A-C-B, NPS current is provided by a 3 phase source with
conventional A-B-C phase sequence
©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
4 (x4)
)
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
n/a
I (I ), I (I ), I (I ),
L1 A L2 B L3 C
46IT/46DT - Self Reset
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
(46NPS)
Chapter 6 Page 35 of 73