There are four common types of standard conductors that have been used for many years in the utility industry: All-aluminium conductor (AAC), Aluminium conductor steel-reinforced (ACSR), and all Aluminium alloy conductor (AAAC). Regardless of the type of metal used in the make-up of the conductor, the strands always are round and have a concentric lay.These conventional conductors have long, proven track-records of performance under specified conditions and certain typesof applications.
It is a kind of concentric-lay-stranded conductors made from round aluminium (extra hard) wires and round, coated steel core wires. The core can be single wire or stranded depending on the required size. Steel core is available in Class A, B or C galvanization for corrosion protection and different tensile requirements. Additional corrosion protection is available through the application of grease to the core or infusion of the completed conductor with grease.
With simple structure, ACSR is easy to set up and maintain, Low cost and high transmission capacity, high mechanical strength, high tensile strength. The principal advantage are their high tensile strength and light weight, covering longer spans with less supports. Due to the greater diameter of an ACSR conductor much higher limit can be obtained, giving a big advantage on high and extra high voltage overhead lines.
ACSR is available in a range of steel strengths varying from 6% up to 40% mainly for power transmission and distribution line. The higher strength ACSR conductors are used for river crossings, overhead earth wires,and installations involving extra long spans. Against any given resistance of conductor,ACSR conductor may be manufactured to have different tensile strengths as per requirement.