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A bus bar is a solid copper or aluminium bar that is used in switch gear and motor control centers. Smaller bus bars are used in central distribution panels and seen in everyday use, the bars that the household breakers plug or bolt into in a homes distribution panel. The bars in switch gear and MCC's are rated to carry a rated current. To bend a wire into the back of these types of equipment would be next to impossible due to the constraints of limited space.
Additional InformationThe word 'busbar' is derived from the word, 'omnibus', meaning to 'serve all', which is exactly what a busbar does -it serves all the circuits connected to it.
Occasionally, you see the word, 'busbar', spelt as 'bussbar' -this is an incorrect spelling which indicates a lack of knowledge of the origin of the word.
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ViviThe term, 'bus', in 'busbar', comes from the word, 'omnibus', meaning 'to serve all'.
A busbar, then, is a copper bar that connects several independent circuits together. For example, a generator might be connected to a busbar, serving several circuits all connected to that same busbar.
There are separate busbars for line, neutral, and earthing (grounding) connections.
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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.
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...
Compressed air system for bus bar?
To avoid accumulation of moisture.
What is an infinite bus bar?
A theoretical bus that can provide infinite amounts of current. This is often used in distribution level load studies - the distribution source bus is often modelled this way. The majority of voltage drop is due to the modelled distribution lines, and the step down transformers to the distribution bus often use load tap changers to keep the source voltage at the desired level anyway.It's a electrical term relating to power grids. See the Related Link below.
