Different types of bus – bar


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


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