'(& )( )'& &) ( &!& ")& &$(( $# Ć %&( $# #)" &&#$
4 - 15
Siemens AG ⋅ May 1998
Table 4.2 Allocation of a feeder to a busbar section
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
Feeder
Feeder;
Bus coupl.
(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
BBA
no
protection*)
Feeder;
Bus coupl.
Bus
coupler
Feeder
Feeder
Bus
coupler
Bus
coupler
Bus
coupler
Bus
coupler
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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