Typical Connection: 7Sr22 Directional Oc And Ef; Figure 7.5-1 7Sr22 Applied To Feeder - No Zero Sequence Voltage Source - Siemens 7SR210 Installation Manual
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7.5
Typical Connection: 7SR22 Directional OC and EF
L1
L2
L3
P1
S1
S2
P2
Figure 7.5-1 7SR22 Applied to Feeder - No Zero Sequence Voltage Source
©2011 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
A
B
C
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) Vee Connected VT: Phase Voltage Config:-VA,VB,VC
4) DEF elements must be NPS polarised (Vo polarising not applicable)
7SR210 & 7SR220 Installation Guide
1A
I
I
L1
5
5A
(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
17
18
19
20
21
22
23
24
25
26
27
28
Page 23 of 24
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