Specifications

Overcurrent Protection SIPROTEC 7SJ80
4/28 SIPROTEC Compact · SIEMENS SIP 3.01 · Edition 3
Connection examples
Fig. 4/28 Sensitive directional ground-fault detection with directional
element for phases
Fig. 4/29 Sensitive directional ground-fault detection
Connection for compensated
networks
The fi gure shows the connection of
two phase-to-ground voltages and
the V
E
voltage of the broken delta
winding and a phase-balance neutral
current transformer for the ground
current. This connection maintains
maximum precision for directional
ground-fault detection and must be
used in compensated networks.
Sensitive directional ground-fault
detection.
k
l
IA
K
L
IB
IC
a
b
VA-B
VN
VC-B
A
B
C
B
da
dn
A
F2F1
F4F3
F6F5
E9
E11
E13 E14
E12
ABC
k
l
K
L
INs
F7F8
SIPROTEC
Surface-/Flush Mounting Housing
5252 52
k
l
IA
K
L
IB
IC
ABC
k
l
K
L
VN
A
B
C
B
dn
INs
A
da
F2F1
F4F3
F6F5
F7F8
E13 E14
SIPROTEC
Surface-/Flush Mounting Housing
5252 52
LSA4792a-en.pdf
4_29_LSA4793a-en.pdf
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