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ACSR: ALUMINUM CONDUCTOR STEEL REINFORCED


What is an ACSR? 
Aluminum conductor steel reinforced (or ACSR) cable is a specific type of high-capacity, high-strength stranded cable typically used in overhead power lines. The outer strands are aluminum, chosen for its excellent conductivity, low weight and low cost. The center strand is of steel for the strength required to support the weight without stretching the aluminum due to its ductility. This gives the cable an overall high tensile strength..continue..



Overhead transmission line conductors are usually ACSR or AAC to B.S. 215, although the aluminium alloy conduc­tors to B.S. 3242 are also being used. Aluminium wires used in the AAC and ACSR are hard drawn and of 99.5% purity aluminium with a specific resist­ance of 2.8264 microhm cm. This gives a conductivity of 61 % I.A.C.S. ..continue..


Datasheet of ACSR and all the types of such construction. This can be use as reference for conductor different size and resistance ..continue..


ACSR is a concentric-lay-stranded conductor consisting of a single core wire or a stranded steel central core with one or more layers of 1350 H19 stranded aluminum wires. Steel core wires are protected from corrosion by galvanizing, aluminum-clad alloy or zinc – 5% aluminum mischmetal alloy coating. Standard, High, Extra and Ultra High strength steel are also available. All ACSR cables are also available in a non-specular finish. ..continue..


The rated continuous current carrying capacity of the conductor at a referenced ambient temperature, allowable temperature rise, geometry and installation.  For bare overhead conductors an ambient air temperature of 40°C is typical.  For underground insulated power cables an ambient earth temperature of 20°C is typical.  Temperature correction factors are then given to adjust the base ampacity for other ambient temperature levels. If a cable is loaded continuously above rated ampacity the insulation temperature design limits will be exceeded.  This will lead to loss of insulation life, not instantaneous failure. If a bare overhead conductor is loaded continuously above rated ampacity the mechanical strength of the conductor is reduced.  This will lead to a loss of mechanical life, not instantaneous failure. ..continue..


ACSR conductors are also known for its aluminum to steel ratio (i.e. 18/1, 26/7, 45/7). This also describes the stranding of every ACSR cable. ACSRs are also known to have code words which individual has different intrisic characteristics and they are usually taken from the names of birds others are from animals.

The table below shows a simple listing of different types of ACSR conductors with its respective resistance and reactance. This parameters affect the value of impedance of the wires thus also affects the power flow when it is put into service. Knowing these is very important in System's Loss Analysis especially in analyzing voltage drop in transmission lines...continue..

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