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Overhead lines generally use
S.R. conductors
Copper conductors
Aluminum conductors
Any of the above
S.R. conductors
Overhead lines typically use ACSR (Aluminum Conductor Steel Reinforced) conductors. These combine the high conductivity of aluminum with the high tensile strength of a steel core, making them suitable for long-span overhead transmission.
Overhead lines typically use ACSR (Aluminum Conductor Steel Reinforced) conductors. These combine the high conductivity of aluminum with the high tensile strength of a steel core, making them suitable for long-span overhead transmission.
RACтАЛ=RDCтАЛ├Ч(1+╬▒╬ФT) тАФ Resistance variation with temperature
TtotalтАЛ=TsteelтАЛ+TalтАЛ тАФ Composite tensile strength model
ACSR works by utilizing a multi-strand structure where aluminum wires provide the electrical path while a central stranded steel core acts as a mechanical support member. Because aluminum has a lower tensile strength than steel, the steel core allows for larger transmission spans with less sag, significantly reducing the number of towers required.
ACSR stands for Aluminum Conductor Steel Reinforced.
Aluminum is used for its high conductivity and low weight.
Steel is used to increase the mechanical strength against wind and ice loads.
Steel core prevents sag for long transmission spans.
High strength-to-weight ratio
Reduces sag, allowing for longer spans
Economical for long-distance power transmission
Heavier than all-aluminum conductors (AAC)
Subject to corrosion in coastal areas (requires grease or specialized alloys)
High Voltage (HV) transmission lines
Extra High Voltage (EHV) overhead lines
Long-span distribution lines
S.R. stands for Steel Reinforced.
Copper conductors were historically used but are now avoided in overhead lines due to high cost and high weight compared to ACSR.
Aluminum is preferred due to low cost and high specific conductivity.
A is correct тАФ Overhead transmission lines primarily utilize ACSR conductors to balance electrical conductivity with the mechanical strength required for long spans.
Always remember that in transmission line economics, ACSR is chosen because it allows a reduction in the number of towers, which is the most expensive component of an overhead line project.