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An aluminum or copper conductor supported by insulators that interconnects the loads and the sources of electric power in an electric power system. A typical application is the interconnection of the incoming and outgoing transmission lines and transformers at an electrical substation. Bus-bars also interconnect the generator and the main transformers in a power plant. In an industrial plant such as an aluminum smelter, large bus-bars supply several tens of thousands of amperes to the electrolytic process. See also Electric power substation.
Major Type of Busbar
The major types are
(1) Rigid bus-bars, used at low, medium, and high voltage
The rigid bus-bar is an aluminum or copper bar, which is supported by porcelain insulators.
(2) Strain bus-bars, used mainly for high voltage
The strain bus-bar is a flexible, stranded conductor which is strung between substation metal structures and held by suspension-type insulators.
(3) Insulated-phase bus-bars, used at medium voltage
The insulated-phase bus-bar is a rigid bar supported by insulators and covered by a grounded metal shield. The main advantage of this system is the elimination of short circuits between adjacent phases.
(4) Sulfur hexafluoride (SF6)-insulated bus-bars, used in medium- and high-voltage systems
The sulfur hexafluoride-insulated bus-bar is a rigid aluminum tube, supported by insulators and installed in a larger metal tube, which is filled with high-pressure sulfur hexafluoride gas.
According to size 3 types
* tubular bus bar
* solid bus bar
* flat bus bar
According to capacity 4 type
* Extra high voltage bus
* high voltage bus
* medium voltage bus
* low voltage bus