鋼芯鋁絞線(xiàn)與鋁絞線(xiàn)都是沒(méi)有外絕緣的電線(xiàn)，也就是我們俗稱(chēng)的“裸電線(xiàn)”，而不懂電纜行業(yè)的人可能不知道如何區分鋼芯鋁絞線(xiàn)與鋁絞線(xiàn)，外觀(guān)上它們都是鋁線(xiàn)。那么，如何區分鋼芯鋁絞線(xiàn)與鋁絞線(xiàn)呢?ACSR and AAC are both non insulated wires, commonly known as "bare wires". Those who are not familiar with the cable industry may not know how to distinguish between steel cored aluminum stranded wire and aluminum stranded wire, as they are both aluminum wires in appearance. So, how to distinguish between ACSR and AAC?
1. Distinguish by cross-sectional color: In the cross-section of ACSR, we can clearly see that one or more conductors in the middle have a heavier color than the outer layer of aluminum wire, so it is ACSR. The colors of AAC are all the same;
2. Distinguish based on the softness and hardness of the wires: ACSR has much stronger overall hardness than AAC due to the presence of steel wires inside, which can be distinguished by hand grip, while aluminum stranded wire is softer;
3. Distinguish by the weight of the conductor: ACSR has steel wires inside, and we all know that steel is heavier than aluminum, so it can also be distinguished by weighing.
4. Difference in model: ACSR, abbreviated as "LGJ", is made up of aluminum wire and steel wire twisted together, and is mainly suitable for overhead transmission lines compared to ordinary aluminum wire "L J". The interior of ACSR is a steel "core", and the exterior is wrapped around the steel core with aluminum wire twisted together; Steel core mainly serves to increase strength, while AAC mainly serves to transmit electrical energy. Both belong to bare wires and have essentially the same purpose, but differ in their model and specification representation methods.
Ordinary AAC: The model is represented by "L J" and belongs to bare wire. At present, aluminum clad steel stranded wire (LGJ) is widely used as the conductor in China, with the steel core mainly used to increase strength and AAC mainly used for transmitting electrical energy. The cross-sectional area of the wire varies depending on the voltage. For example, currently, LGJ-400/35 conductors are commonly used for 500 kV transmission lines. Among them, L is the abbreviation for aluminum wire, G is the abbreviation for steel core, J is the abbreviation for stranded wire, 400 is aluminum 400 square millimeters, and 35 is steel 35 square millimeters.
5. Main application: ACSR is a reinforced conductor made by twisting single-layer or multi-layer aluminum stranded wires outside of galvanized steel core wires. Mainly used in the power and transmission line industries. ACSR has the characteristics of simple structure, easy installation and maintenance, low line cost, large transmission capacity, conducive to laying across special geographical conditions such as rivers and valleys, good conductivity and sufficient mechanical strength, high tensile strength, and expandable tower distance. Therefore, it is widely used in overhead transmission and distribution lines of various voltage levels.
Generally, for high-voltage transmission lines, due to the limited path of the line and the inability to install multiple lines on one path, people have come up with the method of using one path, one set of iron towers, and hanging multiple wires, that is, one line is equivalent to installing multiple lines. For example, for 500KV transmission lines, China mostly adopts the method of hanging four wires, which is called the same tower parallel installation. This is the main reason why some poles are used for both "L J" and "LGJ".
