Siemens SIPROTEC 7SS52 User Manual

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4 - 16
Siemens AG ⋅ May 1998
Feeder Bus coupler
BBA
BBB
BPB
Busbar allocation
CT
location
BBA BBB
Check
zone
BPB
external
internal
Bus
coupler
Bus
coupler
Feeder
Feeder
(a) Bypass (transfer) bus under voltage
BBA
BBB
BPB
Busbar allocation
CT
location
BBA BBB
Check
zone
BPB
external
internal
FeederFeeder
(b) Feeder simultaneously on bypass (transfer) bus and main bus
BBA
BBB
BPB
Busbar allocation
CT
location
BBA BBB
Check
zone
BPB
external
internal
Bus
coupler
Bus
coupler
-
-
Feeder
Feeder;
Bus coupl.
(c) Final condition, bypass (transfer) operation
Feeder;
Bus coupl.
BBA
no
protection*)
Feeder;
Bus coupl.
Bus
coupler
Feeder;
Bus coupl.
Feeder;
Bus coupl.
-
-
-
-
no
protection*)
*) The current being fed by the feeder or into the feeĆ
der cannot be measured.
The BPB is protected by the feeder protection!
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Siemens SIPROTEC 7SS52 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SS52
Category	Protection Device
Language	English