What do overhead insulated wires differ from steel core aluminum strand

July 06,2021

Do you know the difference between insulated wire and ACSR? They have many standards, AS3607/ IEC 61089 /BS EN50182/GB/T1197/ASTM B549 and so on. Now let's take a look at the difference. 


Overhead insulated wire


Overhead insulated wires are mainly composed of some insulating materials, and the insulating protective layer is also divided into thin and thick insulating layers; it is suitable for areas with more lightning, and the overhead insulated wires have a layer of insulation protection, which can reduce line lead. Thunder, even if there is lightning, the impact will be much smaller;


Steel core aluminum stranded wire


The steel core aluminum stranded wire is composed of cold drawn aluminum wire and galvanized steel wire. The galvanized steel wire is used as the core to twist evenly and tightly. The strands of each layer are opposite, and the direction of the outer strands is right. The steel core is arranged naturally.


After the steel core is cut, the steel core is easy to reset, and the same is required for the aluminum wire. The stranding coefficient of the wires must be the same, and the pitch diameter ratio of the stranding must also comply with the standard; the usability is that the core of the cross-section of the steel core aluminum stranded wire is a galvanized steel wire, surrounded by 6 (or a total of 19 in two layers) ) The bare aluminum wire is twisted into a transmission bare overhead line, because it has a steel wire core to withstand tension, it is used for field transmission circuits, and the distance between the poles and towers can reach hundreds of meters.


Choose ASTM B549 aluminum plate steel core aluminum stranded wire


Compared with ordinary, why choose ASTM B549 aluminum plate steel core aluminum stranded wire


1. Stranded wire is 5% lighter, the load rate is increased by 2 to 3%, and the power loss is reduced.

2. Good anti-corrosion performance and longer service life

3. Easy to install and maintain

4. Good conductivity, good energy saving effect

Most overhead cables have been developed very maturely in power transmission lines. But there are still issues in the use of insulated wires. The aluminum steel core strand commonly used in high-voltage power transmission lines are equipped with high conductivity, good thermal stability, low slalom, self-damping and other characteristics, and it also has sub-damping characteristics, which is conducive to reducing breeze vibration and reducing the line loss of transmission lines.


What are the requirements for the ACSR fuse device?


1. There should be rated voltage and current on the fuse, and try to indicate the size and specification of the melt.

2. The fuse should be intact and undamaged, with close and reliable contact, and should be installed vertically.

3. The melt of the porcelain plug-in fuse should use qualified lead alloy wire or copper fuse.

4. Do not use multiple fuses to replace a larger fuse.

5. The incoming wire of the screw fuse should be connected to the center end of the base, and the outgoing wire should be connected to the threaded shell.


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