Is ACSR without rubber insulation safe?

The advantages of ACSR mainly include excellent electrical conductivity, thermal conductivity and corrosion resistance. Anti-corrosion performance: When the surface of the steel-reinforced aluminum strand is in contact with the air, a thin and strong oxide layer is formed immediately. This oxide layer is particularly resistant to various forms of corrosion. Aluminum has the characteristics of withstanding relatively harsh environments, so the power of aluminum as a tray is much better than other wires.

The mechanical properties of the steel-cored aluminum stranded wire are small rebound, high flexibility, good bending performance, and easier terminal connection. The special formula and heat treatment process greatly reduce the creep tendency of metal under heat and pressure. The coefficient of thermal expansion is slightly higher than other types of cables, expanding or contracting a little more.

ACSR has greatly improved the connection performance of traditional aluminum cables, which is the fundamental reason for its popularity. Especially when the conductor is exposed to fire, it will produce high-strength anti-creep performance, which can ensure connection stability even under long-term overload and overheating. There are many advantages of twisted wire, it is worth choosing by users.

First of all, before answering the question in the title, you must first know what is a steel-cored aluminum stranded wire. The so-called steel-cored aluminum stranded wire is a product made by twisting aluminum wire and steel wire. This hybrid stranded wire is suitable for overhead transmission lines. The steel core can provide strength and increase its mechanical strength, and the aluminum wire mainly provides the function of electric energy transmission.

So what is the appearance quality of ACSR?

1.The appearance of the aluminum-clad steel-reinforced aluminum stranded wire should be smooth, and no exposed steel is allowed. Stranding should be even and tight, there should be no missing wires, broken wires, loose strands, broken skins, etc., and it should not be loose after cutting.

2.The surface of the steel wire of the galvanized steel-reinforced aluminum stranded wire should be coated with a layer of uniform and continuous zinc. The steel wires in the galvanized steel-reinforced aluminum stranded wire should be tightly twisted without interlacing, breaking and bending. The diameter and lay length of the steel-reinforced aluminum stranded wire should be uniform and not loose after cutting.

3.The surface of the prestressed aluminum stranded wire should not contain lubricants, oil stains and other substances that reduce the adhesion between the aluminum stranded wire and concrete. Slight floating rust is allowed on the surface of the steel-reinforced aluminum stranded wire, but it must not be corroded into pits visible to the naked eye.

There has always been a problem with high-voltage transmission lines, that is, the path of the transmission line is limited, but it is impossible to put multiple lines on one path, so the solution people adopt is to use one path, a set of iron towers, hang Multiple wires, that is, one line is equivalent to multiple lines. We can see these iron towers in the open suburbs of cities, mountains, and wastelands. They are a common way of modern high-voltage power transmission.

For 500KV transmission lines, four wires are often used. The electrical industry calls it the “four-split method”. In fact, the so-called four-split method is four ordinary steel-cored aluminum stranded wires. , convenient erection and maintenance, low cost, large output and many other advantages, and because it is suitable for laying in places such as rivers and valleys, it has good electrical conductivity and strong mechanical strength, because it is widely used in overhead transmission of various voltage levels in the distribution line.

ACSR we are talking about is actually a bare wire. Corresponding to the bare wire, there are also overhead insulated wires. It has been widely used in domestic cities and power distribution systems that require high power supply reliability, although the price is relatively high. , but because of its better performance, it will also be the direction of future distribution line development.

The steel-cored aluminum stranded wire is a bare conductor, which is a special wire specially used for overhead power. As long as the relevant specifications are followed, the operation is strictly in accordance with the operation manual, and various safety distances are guaranteed. Under normal circumstances, the steel-cored aluminum stranded wire is It is safe and will not cause harm, because there is no need to worry too much about the problem of exposed wires.