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It provides stability in case of problems with disconnectors auxiliary contacts (stuck contacts or wiring problems). Ir relies on the feeder currents in the busbar.
Disconnectors positions are not required.
There is no selectivity using check zone. It's usefully because it prevents external faults to be considered as a busbar fault.
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The purpose of the bus bar protection unit is to isolate any bus by tripping its contactor or isolate a faulty bus in the variable ac system?
The Bus Bar is (usually 3, or 4) solid copper bars that run through an MCC (Motor Control Center) and just supply power to the individual 'buckets' (compartments that contain the individual motor starters). The only protection for a bus bar would be from the 'Panelboard', or 'Switchboard' breaker that feeds the bus bar mounted in a separate MCC. Make Sense???, let me know if not...
What is the bus bar size for 6000A?
5-6x150 Cu. BUS BAR PER PHASE
Why the impedance of infinite bus bar is zero?
...because it is an infinite bus bar, meaning it can supply infinite current. By Ohm's law, since the voltage at the bus bar is fixed, to have infinite current, you must have a zero impedance.
Compressed air system for bus bar?
To avoid accumulation of moisture.
Bus bar differential protection relay?
SEL-387 (4 current sets), SEL-387B (6, can be combined with three units for total of 18), CA-16 is an older electromechanical type bus dif relay. I'm not familiar with other brands, but there are many others made by ABB, GE, etc.
