Specifications

Overcurrent Protection SIPROTEC 7SJ80
4/27SIPROTEC Compact · SIEMENS SIP 3.01 · Edition 3
Connection examples
Fig. 4/25 Residual current circuit without directional element
Fig. 4/26 Residual current circuit with directional element
Fig. 4/27 Sensitive ground current detection without directional element
Connection of current
and voltage transformers
Standard connection
For grounded networks, the ground
current is obtained from the phase
currents by the residual current
circuit.
For power systems with small earth
currents, e.g. isolated or compen-
sated systems, the earth current is
measured by a zero-sequence current
transformer.
S2
S1
IA
P1
P2
IB
IC
ABC
IN
F2F1
F4F3
F6F5
F8
F7
A
B
C
SIPROTEC
Surface-/Flush Mounting Housing
5252 52
k
l
IA
K
L
IB
IC
ABC
IN
a
b
VC-N
VB-N
A
B
C
B
A
F2F1
F4F3
F6F5
F8
F7
E9
E11
E13 E14
E12
VA-N
SIPROTEC
Surface-/Flush Mounting Housing
5252 52
F2F1
F4F3
F6F5
F7
F8
k
l
IA
K
L
IB
IC
ABC
k
l
K
L
INs
A
B
C
SIPROTEC
Surface-/Flush Mounting Housing
5252 52
4_25_LSA4789-en.pdf
4_26_LSA4791-en.pdf
4_27_LSA4790a-en.pdf
1
2
3
4
5
6
7
8
9
10