Siemens SIPROTEC 7SS525 V3.3

Functions
106
7SS52 V4 Manual
C53000-G1176-C182-3
Figure 5-13 Switching states in bypass operation (Feeder and bus coupler on the same bus
zone)
PROT TR
BUS
(5401/CU)
Meas.
system
Bay/
CT
BZA TB
Check
zone
Yes Line side Feeder,
bus coup.
Bus
coupler
Feeder
Bus side Feeder,
bus coup.
Bus
coupler
Feeder
No Line side Feeder,
bus coup.
unpro-
tected
Feeder,
Coup
Bus side Feeder,
bus coup.
unpro-
tected
Feeder,
Coup
PROT TR
BUS
(5401/CU)
Meas.
system
Bay/
CT
BZA TB
Check
zone
Yes Line side Feeder
connect.
to BZA
Feeder
Bus side Feeder,
bus coup.
no
1)
protect.
Feeder,
Coup
No Line side Feeder
connect.
to BZA
Feeder
Bus side Feeder,
bus coup.
unpro-
tected
Feeder,
Coup
1)
The current being fed by the feeder or into the feeder
cannot be measured.
PROT TR
BUS
(5401/CU)
Meas.
system
Bay/
CT
BZA TB
Check-
zone
Yes Line side coupler Feeder,
Coup.
Feeder
Bus side coupler no
1)
protect.
Bus
coupler
No Line side coupler
connect.
to BZA
Bus
coupler
Bus side coupler unpro-
tected
Bus
coupler
1)
The current being fed by the feeder or into the feeder
cannot be measured.
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