Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Busbars are made of
Aluminum
Copper
Steel
Both (a) and (b)
Both (a) and (b)
Busbars are conductive metallic strips or bars used in electrical switchgear to collect and distribute current from multiple incoming and outgoing feeders. High-conductivity materials like copper and aluminum are primarily used to ensure low electrical resistance and minimal voltage drop.
Busbars are conductive metallic strips or bars used in electrical switchgear to collect and distribute current from multiple incoming and outgoing feeders. High-conductivity materials like copper and aluminum are primarily used to ensure low electrical resistance and minimal voltage drop.
R=╧БALтАЛ тАФ Resistance of the busbar where ╧Б is resistivity, L is length, and A is cross-sectional area.
J=AIтАЛ тАФ Current density requirement for material selection.
The selection of busbar material is governed by the necessity for high electrical conductivity (╧Г)and thermal stability. Copper offers superior conductivity and mechanical strength, making it ideal for compact, high-current environments. Aluminum, being lighter and significantly cheaper, is preferred for large-scale outdoor substations where space and cost are primary constraints, despite requiring larger cross-sectional areas to compensate for its higher resistivity.
Copper has higher conductivity and is used where space is limited.
Aluminum is preferred in outdoor substations for its cost-effectiveness and weight.
Busbars must withstand thermal expansion and electromagnetic forces during short-circuit conditions.
Surface treatment (e.g., silver or tin plating) is often applied to prevent oxidation.
Low impedance path for power distribution
Easily accessible for system expansion
Modular installation in switchgear
High cost of copper
Susceptibility to oxidation (especially aluminum)
Significant thermal expansion management required for long runs
Electrical Substations
Industrial Power Distribution Boards
Battery Banks and UPS systems
| Feature | Copper | Aluminum |
|---|---|---|
Conductivity | Higher (~100% IACS) | Lower (~60% IACS) |
Cost | Higher | Lower |
The choice between copper and aluminum is a trade-off between the installation footprint and the initial capital investment.
Steel is generally not used for current-carrying busbars due to its high resistivity and magnetic losses, though it may be used for mechanical supports.
D is correct тАФ Both copper and aluminum are extensively used as busbar materials based on the specific cost, space, and performance requirements of the power system.
Always remember that aluminum requires roughly 1.6 times the cross-sectional area of copper to achieve the same resistance, influencing the design of terminal connectors.