Choosing a bus protection scheme requires several key considerations. The complexity of bus protection varies considerably depending on such factors as the bus layout, allowed bus switching scenarios, availability of suitable current transformers (CTs), and maintenance issues. Buses with statically assigned zone currents are well suited for the use of high-impedance bus relaying (if suitable CTs are available) and do not require disconnect status inputs. For substations with terminals capable of switching between different buses, it is necessary to dynamically assign input currents to the bus zones of protection based on the disconnect auxiliary contact status.
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