In electric power distribution, a bus bars (also bus bar) is a metallic strip or bar, typically housed inside switch gear, panel boards, and bus way enclosures for local high current power distribution. They are also used to connect high voltage equipment at electrical switch yards, and low voltage equipment in battery banks. They are generally un insulated, and have sufficient stiffness to be support in air by insulated pillars. Meanwhile,These features allow sufficient cooling of the conductors, and the ability to tap in at various points without creating a new joint.
Moreover, The bus bar system consists the isolator and the circuit breaker. On the occurrence of a fault, the circuit breaker is trip off and the faulty section of the bus bar is easily disconnect from the circuit.
The electrical bus bar is available in rectangular, cross-sectional, round and many other shapes.Therefore, The rectangular bus bar is mostly use in the power system. The copper and aluminium is use for the manufacturing of the electrical bus bar.
The most common of the bus-bars are 40×4mm (160 mm2); 40×5 mm (200 mm2) ; 50×6 mm (300mm2) ; 60×8 mm (480 mm2) ; 80×8 (640 mm2) and 100×10 mm (1000 mm2).
The various types of bus bar arrangement is use in the power system. The selection of the bus bar is depend on the different factor likes reliability, flexibility, cost etc. The following are the electrical considerations governing the selection of any one particular arrangement.
- The bus bar arrangement is simple and easy in maintenance.
- The maintenance of the system did not affect their continuity.
- The installation of the bus bar is cheap.
Therefore, The small substation where continuity of the supply is not essential uses the single bus bar. But in a large substation, the additional bus bar is use in the system so that the interruption does not occur in their supply.
Single Bus-Bars Arrangement
The arrangement of such type of system is very simple and easy. The system has only one bus bar along with the switch. All the substation equipment like the transformer, generator, the feeder is connect to this bus bar only. The advantages of single bus bar arrangements are
- low initial cost.
- It requires less maintenance
- It is simple in operation
Drawbacks of Single Bus-Bars Arrangement
- The only disadvantage of such type of arrangement is that the complete supply is disturb on the occurrence of the fault.
- The arrangement provides the less flexibility and hence use in the small substation where continuity of supply is not essential.