Substation buses are usually heavy conductors, often made of ________, and may be hollow or solid.

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Multiple Choice

Substation buses are usually heavy conductors, often made of ________, and may be hollow or solid.

Substation buses must carry large currents reliably while balancing conductivity, weight, and cost. Aluminum is commonly used for these heavy conductors because it provides a very favorable conductivity-to-weight ratio and is less expensive than copper at large cross-sections. Its lighter weight makes it easier to support in the substation and reduces structural requirements, while its corrosion resistance and ease of fabrication suit the bulky bus shapes needed. Buses can be hollow or solid to meet mechanical and electrical needs. Hollow sections offer high stiffness with less weight, which helps resist bending, vibration, and short-circuit forces, while solid sections can provide maximum strength where required. Copper could offer slightly better conductivity, but its higher cost and greater weight make aluminum the preferred choice for large bus applications.

Substation buses must carry large currents reliably while balancing conductivity, weight, and cost. Aluminum is commonly used for these heavy conductors because it provides a very favorable conductivity-to-weight ratio and is less expensive than copper at large cross-sections. Its lighter weight makes it easier to support in the substation and reduces structural requirements, while its corrosion resistance and ease of fabrication suit the bulky bus shapes needed.

Buses can be hollow or solid to meet mechanical and electrical needs. Hollow sections offer high stiffness with less weight, which helps resist bending, vibration, and short-circuit forces, while solid sections can provide maximum strength where required. Copper could offer slightly better conductivity, but its higher cost and greater weight make aluminum the preferred choice for large bus applications.

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