First, a distinction needs to be made between static and
reconfigurable buses. In reconfigurable buses, a given breaker
may connect a given network element (e.g., line, transformer,
capacitor bank) to multiple bus sections. Examples of
reconfigurable buses include a double-bus single-breaker or
main/transfer bus. This dynamic association of breakers
complicates the BF tripping logic because the BF protection
system must know which breakers are connected to the same
bus as the failed breaker. For this reason, the BF function is
often integrated with a low-impedance bus protection system,
or the bus protection system receives the BFT signals from
external BF elements and routes the BFT command
adequately to the appropriate breakers