Aluminium Conductors Steel Supported Acss

1. GENERALITIES:
ACSS/TW is a Trapezoidal Aluminum Conductor Steel-Supported concentric-lay-stranded conductor. The aluminum strands are S trapezoidal in shape.
The wedge-shaped aluminum strands enable a more-compact alignment of the aluminum wires.
Conductor designs that maintain the same cross-sectional area of aluminum as a conventional round conductor result in a TW conductor that is 10 to 15 percent smaller in overall diameter.
Conductor designs that maintain the same overall diameter as a conventional round conductor result in a TW conductor that has 20 to 25 percent more aluminum cross-sectional area packed in.
The ACSS/TW conductors are manufactured in accordance with the requirements of the latest issue of ASTM B857.
The steel strands form the central core of the conductor, around which is stranded two, three or four layers of aluminum 1350 O temper (annealed) wires. The steel core may consist of a concentric stranded cable of 7, 19 or more wires. Numerous combinations of aluminum and steel strands and layers are possible. The sizes and constructions listed on the following pages are common examples used in overhead lines.
The steel core wires are protected from corrosion by galvanizing. For ACSS/TW conductors the standard Class A galvanized coating is usually adequate for ordinary environments.

2. FEATURES AND BENEFITS:
ACSS/TW conductors are similar to conventional ACSR/TW conductors but have some very important additional advantages. ACSS/TW conductors can operate continuously
At high temperatures (200° C) without damage;
It sags less than ACSR/TW under emergency electrical loadings; It has self damping properties; And its final sags are not affected by long-term creep of the aluminum.
ACSS/TW conductors constructed of equivalent aluminum crosssectional area provide a conductor that is smaller in overall diameter than the equivalent conventional round wire ACSS conductor. The reduced conductor diameter is advantageous in reducing the effects of ice and wind loading on the conductor.
ACSS/TW conductors constructed to equivalent overall diameter enable a greater cross-sectional area of aluminum within the conductor, allowing a significant increase in conductor currentcarrying capacity.

3. APPLICATIONS:
Trapezoidal Aluminum Conductors, Steel-Supported (ACSS/TW) are extensively used for overhead distribution and transmission lines.

4. ELECTRICAL PARAMETERS:
The electrical parameters for the Trapezoidal ACSS equivalent cross-sectional area, and equivalent overall diameter conductors may be found in the last table of this section.

5. OPTIONS:
High-Strength Class A galvanized steel core (/HS).
Extra-High-Strength Class A galvanized steel core (/EHS).
Ultra-High-Strength Class A galvanized steel core (/UHS).
Regular-Strength Class A zinc-5% aluminum misch-metal alloy-coated steel core (/MA).
High-Strength Class A zinc-5% aluminum misch-metal alloycoated steel core (/MS).
Extra-High-Strength Class A zinc-5% aluminum misch-metal alloy-coated steel core (/EMS).
Ultra-High-Strength Class A zinc-5% aluminum misch-metal alloy-coated steel core (/UMS).
Aluminum-clad steel core (/AW).
High-Strength aluminum-clad steel core (/HSAW)
Extra-High-Strength aluminum-clad steel core (/EHSAW).
Ultra-High-Strength aluminum-clad steel core (/UHSAW).
250° C Operating Temperature rating utilizing either the zinc-5% aluminum misch-metal alloy-coated steel core wires, or the aluminum-clad steel core wires.

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