Product Information

Specification

ACSS TW Aluminum Conductor Steel Supported Bare Concentric Lay Stranded Conductors Trapezoidal Wire

Application:

ACSS TW (Aluminum Conductor Steel Supported Trapezoidal Wire) is an overhead conductor used for electrical power transmission. It consists of aluminum wires surrounding a steel core for added strength and durability. The trapezoidal wire configuration allows for improved current-carrying capacity and resistance to high temperatures, making it suitable for long-distance transmission lines in harsh environments. Its concentric lay stranded construction ensures optimal mechanical performance and flexibility.ACSS/TW conductors are manufactured in accordance with
the ASTM specification B857.

Also Known As:

ACSS TW conductor, Aluminum conductor steel supported, Trapezoidal wire conductor, Bare concentric lay stranded wire, ACSS conductor application, High temperature transmission wire, Overhead power transmission conductor.

Construction:

• ACSS/TW, a nonhomogeneous conductor, is a trapezoidal shaped wire compact concentriclay-stranded conductor made from aluminum 1350-O wires and
round, coated steel core wire(s).
• ACSS/TW conductors with equal area or equal diameter as compared to ACSS conductors are available for overhead lines. Steel wires are coated with Class A coating of zinc – 5% aluminum mischmetal alloy. Other Classes of coatings are also available for additional protection from corrosion. Standard, High, Extra and Ultra High Strength steel are also available

Features:

ACSS conductors are preferred over ACSR conductors for
• With zinc – 5% aluminum mischmetal alloy coating on steel wires, ACSS conductors can be operated up to 250 °C.
ACSS conductors carry more current than ACSR conductors due to:
– Minimum average conductivity of 63% IACS for 1350-O aluminum wires vs. an average
conductivity of 61.2% for 1350-H19 aluminum wires in ACSR.
– ACSS conductors can be operated up to 250 °C vs. the maximum operating temperature for an ACSR conductor does not exceed 100 °C.
• ACSS conductors are prone to resist the effects of aeolian vibration due to very
little or no mechanical load on the annealed aluminum wires.
• Long term creep is not a factor when designing with ACSS conductors.
In addition, use of ACSS/TW with the equal area design allows equal ampacity in a conductor with approximately 10% smaller diameter over a standard ACSS
with same area. This smaller diameter of equal area ACSS/TW conductors helps reduce the effects of ice and wind loading on the conductor.
Alternatively, use of ACSS/ TW with equal diameter design provides a conductor in which
the aluminum area is increased by approximately 20% – 25% over a standard ACSS with
same diameter. This increase in the cross-sectional area of the conductor reduces its ac
resistance by about 15% – 20% and thus, increases its current carrying capacity by about 10%.

*Data provided on this page is subject to change based on different manufacturers' variances

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