Typical Connection: 7Sr22 Directional Oc/Ef And Nvd; Figure 7.3-1 7Sr22 Applied To Feeder Including Nvd Protection - Siemens Argus 7SR21 Installation Manual
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7.3
Typical Connection: 7SR22 Directional OC/EF and NVD
L1
L2
L3
P1
S1
S2
P2
Figure 7.3-1 7SR22 Applied to Feeder Including NVD Protection
©2010 Siemens Protection Devices Limited
1A
1
2
5A
3
4
1A
5
6
5A
7
8
1A
9
10
5A
11
12
1A
13
14
5A
15
16
V
L
V
N
NOTES
1) CT circuits are shown connected to 1A tap – use alternative tap for 5A rated CTs.
2) CT and Earth connections are typical only.
3) Application shows use of V
4) Star Connected VT: Phase Voltage Config:-V
7SR21 & 7SR22 Argus Installation Guide
I
I
L1
5
(I
)
(I
)
A
SEF
I
V
L2
L1
(I
)
(V
)
B
A
V
L2
(V
)
B
I
L3
(I
)
C
V
L3
(V
)
C
V
I
4
4
(V
)
(I
)
X
G
A
B
C
as an NVD input.
4
,V
,V
an
bn
cn
1A
17
18
5A
19
20
21
22
23
24
25
26
27
28
Chapter 5 Page 19 of 22
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