Yes. Those solutions were used like some technical solutions in earlier years. You have distance relay on lines and can be used on transformer. Choose one zone or distance stage in revers with adopted impedance setting, timer and some logic between all relays involved in busbar protection.

Yes. We have adopted a relevant solution for bus protection in distribution systems as part of: Article A pilot-based distance protection scheme for meshed distribu...

An issue that requires special attention regards the significant voltage drop during close-in faults (e.g. bus faults), preventing the distance relay from determining fault direction. However, this is addressed through cross-polarization (i.e. the use of healthy-phases voltage) and/or voltage memory (i.e. the use of the pre-fault memorized voltage during close-in three-phase faults), commonly adopted in commercial distance relays.

Yes you can use it, but you have to check over and under reach problems.

It is better to use the busbar differential protection relay in busbar faults.

Thanks, I have another doubt. What kind of circuit breaker can be used to protect against bus-bar faults specifically? and Where it is located?

this is unusual method. you lose both of bus-bars when occur fault in one of them.

No sir. because distance relay purely measure the impedance of line which is not possible on busbar . busbar collects the input and output current therefore there we have to use differential protection .