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The function of steel wire in a ACSR conductor is
To take care of surges
To prevent corona
To reduce inductance and hence improve power factor
To provide additional mechanical strength.
To provide additional mechanical strength.
ACSR (Aluminum Conductor Steel Reinforced) conductors are constructed with a central core of galvanized steel wires surrounded by strands of aluminum. The steel core provides the necessary mechanical tensile strength, allowing the conductor to span longer distances between transmission towers with reduced sag.
ACSR (Aluminum Conductor Steel Reinforced) conductors are constructed with a central core of galvanized steel wires surrounded by strands of aluminum. The steel core provides the necessary mechanical tensile strength, allowing the conductor to span longer distances between transmission towers with reduced sag.
TtotalтАЛ=TAlтАЛ+TSteelтАЛ тАФ represents the total tension handled by the composite conductor
RACSRтАЛ=╧БAAlтАЛLтАЛ тАФ highlights that the resistance depends on the aluminum cross-section only
Aluminum has high conductivity but poor tensile strength, making it prone to stretching under its own weight or external loads (wind/ice). By placing high-strength steel wire at the center, the steel bears the majority of the mechanical tension, while the outer aluminum layers handle the electrical current conduction. This composite structure optimizes both electrical efficiency and structural integrity.
ACSR stands for Aluminum Conductor Steel Reinforced.
Steel core bears mechanical loads, preventing sag.
Aluminum layers provide high electrical conductivity.
The steel core is galvanized to prevent rust and corrosion.
High strength-to-weight ratio
Allows for longer spans between transmission towers
Reduced sag compared to all-aluminum conductors
Higher weight compared to all-aluminum conductors of similar conductivity
Requires specialized connectors for termination
High Voltage (HV) transmission lines
Extra High Voltage (EHV) overhead lines
Long-span distribution feeders
Option A: Surges are handled by surge arresters/insulation, not conductor composition.
Option B: Corona is minimized by increasing the overall diameter (e.g., using bundled conductors), not by the steel core itself.
Option C: Steel actually increases the internal inductance slightly due to its magnetic nature, though it is negligible.
D is correct тАФ The steel core is primarily included in ACSR conductors to enhance mechanical tensile strength, enabling the conductor to withstand greater tension and support longer spans.
Always remember that in ACSR, the aluminum is for electrical performance (conductivity), while the steel is for mechanical performance (tensile strength).