Bus Bars and Transmission Line Conductors

Introduction:
Bus bars and transmission line conductors are essential components used in electrical power systems. They are used to carry electric current from one point to another efficiently and safely. The choice of material for bus bars and transmission line conductors depends on various factors such as conductivity, cost, weight, mechanical strength, and resistance to corrosion.

Options:
a) Lead
b) Aluminium
c) Nichrome
d) Cadmium

Correct Answer: b) Aluminium

Explanation:
1. Conductivity:
- Aluminium has a relatively high electrical conductivity, making it suitable for the transmission of electric current.
- The electrical conductivity of aluminium is approximately 61% that of copper, which is commonly used for conductors.

2. Cost:
- Aluminium is more cost-effective compared to other metals such as copper or silver.
- The lower cost of aluminium makes it a preferred choice for large-scale power systems where a significant amount of conductive material is required.

3. Weight:
- Aluminium is lightweight compared to other metals.
- This lightweight property of aluminium allows for easier installation and reduces the overall weight of power systems, making it more economical.

4. Mechanical Strength:
- Aluminium has good mechanical strength, allowing it to withstand the mechanical stresses experienced during the operation and installation of bus bars and transmission line conductors.

5. Resistance to Corrosion:
- Aluminium has a high resistance to corrosion, making it suitable for outdoor applications where the conductors are exposed to environmental elements.
- The oxide layer formed on the surface of aluminium provides protection against corrosion.

Conclusion:
In conclusion, aluminium is commonly used for bus bars and transmission line conductors due to its high electrical conductivity, cost-effectiveness, lightweight, mechanical strength, and resistance to corrosion. These properties make aluminium a suitable choice for efficient and reliable power transmission in electrical power systems.