ACSR conductor or aluminum conductor steel reinforced is used as bare overhead transmission and as primary and secondary distribution cable. The outer strands are high-purity aluminium, chosen for its good conductivity, low weight, low cost, resistance to corrosion and decent mechanical stress resistance. The centre strand is steel for additional strength to help support the weight of the conductor. Steel is of higher strength than aluminium which allows for increased mechanical tension to be applied on the conductor. Steel also has lower elastic and inelastic deformation (permanent elongation) due to mechanical loading (e.g. wind and ice) as well as a lower coefficient of thermal expansion under current loading. These properties allow ACSR to sag significantly less than all-aluminium conductors. As per the International Electrotechnical Commission (IEC) and The CSA Group (formerly the Canadian Standards Association or CSA) naming convention, ACSR is designated A1/S1A.
The aluminium alloy and temper used for the outer strands in the United States and Canada is normally 1350-H19 and elsewhere is 1370-H19, each with 99.5+% aluminium content. The temper of the aluminium is defined by the aluminium version’s suffix, which in the case of H19 is extra hard. To extend the service life of the steel strands used for the conductor core they are normally galvanized, or coated with zinc to prevent corrosion. The diameters of the strands used for both the aluminum and steel strands vary for different ACSR conductors.
ACSR cable still depends on the tensile strength of the aluminium; it is only reinforced by the steel. Because of this, its continuous operating temperature is limited to 75 °C (167 °F), the temperature at which aluminium begins to anneal and soften over time. For situations where higher operating temperatures are required, aluminium-conductor steel-supported (ACSS) may be used
Lay of a conductor is determined by four extended fingers; “right” or “left” direction of the lay is determined depending if it matches finger direction from right hand or left hand respectively. Overhead aluminium (AAC, AAAC, ACAR) and ACSR conductors in the USA are always manufactured with the outer conductor layer with a right-hand lay. Going toward the center, each layer has alternating lays. Some conductor types (e.g. copper overhead conductor, OPGW, steel EHS) are different and have left-hand lay on the outer conductor. Some South American countries specify left-hand lay for the outer conductor layer on their ACSR, so those are wound differently than those used in the USA.
ACSR manufactured by us can meet ASTM, AS, BS, CSA, DIN, IEC, NFC etc standard
Post time: Sep-09-2024