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Smooth Body Conductors

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Concept of Smooth Body Low Drag Factor conductors
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    SMOOTH BODY CONDUCTORS   www.sreedharclt.webs.com [Pick the date]   Conventional conductors type ACSR  is more popular and being used extensively in transmission lines because of their simplicity in design , reliability and cost effectiveness. However one of the main disadvantages of this type of conductor is their bulkiness. For getting the required current carrying capacity, the overall diameter of the conductor goes up as compared to other alternates like ACAR. This is due to the presence of the strength contributing steel member within the conductor which does not play much role in the electrical characteristics of the conductor. On the other hand the higher physical dimensions ends up in heavy wind and ice load related issues in the field. Nevertheless the inherent advantages overweigh all these drawbacks and ACSR still remains as one of the favorite choices of transmission line designers due to its ruggedness. Concept of Smooth Body Low Drag Factor conductors :  Conventional conductor designs have traditionally used round wires. The use of technology to design and produce trapezoidal wires (TW) provides conductor designers with an alternative to conventional round strand conductor designs. The use of trapezoidal wire designs yields compact conductors with less void area and a reduced outside diameter. With conventional ACSR stranding, the number of aluminum and steel strands uniquely define the ratio of steel area to aluminum area. For example, all 26/7 ACSR constructions have the same ratio of steel area to aluminum area of about 16%. However, with TW strands the number of aluminum and steel strands do not necessarily define a unique steel to aluminum ratio. Therefore the designation of type has replaced the stranding designation to more accurately identify TW conductors. For example a 795 kcmil-26/7 ACSR Drake has a TW counterpart designated 795 kcmil Type 16, ACSR/TW. The aluminum area and steel area of both conductors are identical. The use of TW shaped aluminum strands will cause the ACSR/TW to have a smaller diameter. Advantages of ACSR/TW  An equivalent area ACSR/TW has the same aluminum cross-sectional area as the conventional conductor, but with a smaller overall diameter. The smaller diameter means lower ice and wind loading factors. This enables a reduction in the design strength requirements for the towers and poles, which for new line construction will save money in construction costs. The “equivalent area” ACSR/TW is approximately 10% smaller in OD.    SMOOTH BODY CONDUCTORS   www.sreedharclt.webs.com [Pick the date]   Another option is to have “equivalent diameter” ACSR/TW that has the same diameter as the conventional conductor, but with a much larger aluminum cross-sectional area. You can increase the aluminum content by 20-25%, decrease the AC resistance by 15-20% and significantly increase the current-carrying capacity of the line. “Equivalent diameter” TW conductors can provide energy-saving advantages for consideration in reconductoring projects. ACSR/TW conductors are recognized  for their record of economy, dependability and favorable strength-to-weight ratio. ACSR/TW conductors constructed of equivalent aluminum circular mil cross sectional area provide a conductor that is smaller in overall diameter than the equivalent conventional round wire ACSR conductor. The reduced conductor diameter is advantageous in reducing the effects of ice and wind loading on the conductor. ACSR/TW conductors constructed to equivalent overall diameter enable a greater circular mil cross-sectional area of aluminum within the conductor, allowing a significant increase in conductor current-carrying capacity. The use of trapezoidal wires provides a more compact conductor design with mechanical properties equal to that of conventional ACSR. Since ACSR/TW designs have the same steel-to-aluminum ratios as their equivalent ACSR constructions, stress-strain and creep data developed for conventional stranding of ACSR can be used to predict sag and tension design data for ACSR/TW conductor constructions. ACSR/TW installation requires no special tools, equipment or training.
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