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Stranded conductors arc used for transmitting, power at high voltages because of
Increased tensile strength
Better wind resistance
Ease-in handling
Low cost
Ease-in handling
Stranded conductors consist of several small-diameter wires bundled together rather than a single solid conductor. They are preferred for high-voltage power transmission primarily because they are significantly more flexible, making them much easier to handle, transport, and install over long distances.
Stranded conductors consist of several small-diameter wires bundled together rather than a single solid conductor. They are preferred for high-voltage power transmission primarily because they are significantly more flexible, making them much easier to handle, transport, and install over long distances.
AtotalтАЛ=тИСi=1nтАЛaiтАЛ тАФ Total cross-sectional area of n strands
RACтАЛ>RDCтАЛ тАФ Impact of skin effect due to stranded construction
A solid conductor of large cross-section is rigid and difficult to wind onto transport drums. By twisting multiple strands into a helical shape, the assembly achieves mechanical flexibility while maintaining the required effective cross-sectional area. This structure also reduces the risk of fatigue failure caused by wind-induced vibrations.
Stranded conductors are mechanically flexible for installation.
Skin effect is slightly more pronounced in large stranded conductors compared to hollow conductors, but less of a concern than handling.
The central core often serves as the strength member (e.g., steel in ACSR).
Fatigue resistance is improved compared to solid conductors.
High flexibility for transport and stringing
Reduced risk of conductor breakage under stress
Ease of manufacturing for large cross-sections
Higher manufacturing cost compared to solid conductors
Slightly larger overall diameter for same current capacity
High Voltage Transmission Lines
Distribution Networks
Flexible leads for electrical machinery
ACSR (Aluminum Conductor Steel Reinforced) is the most common type of stranded conductor used in India.
Option A is incorrect because while stranding improves fatigue life, tensile strength is often managed by adding a central steel core rather than the act of stranding alone.
Option B (wind resistance) is not the primary reason; in fact, the larger diameter of stranded conductors slightly increases wind pressure.
C is correct тАФ Stranded conductors are used in transmission lines primarily because they are easier to handle, store, and transport due to their inherent mechanical flexibility.
Always remember that while ACSR conductors provide increased tensile strength due to the steel core, 'Ease-in handling' is the fundamental geometric benefit of using multiple strands over a single solid core.