Cable sheath repair method and site management

The repair method and on-site management of cable sheaths are very extensive due to the wide application of cables, and the on-site construction conditions are uncertain. They may be located in the preliminarily constructed power plant, or they may be located in the newly built field railways, which may be on the bridge, and may also be In cable tunnels... In many cases, the field conditions are very poor. In this case, the phenomenon of scratches on the surface of the cable sheath during the cable laying process is common. In many cases, the damage is minor and only the protection is impaired. Set, the cost of replacing the cable at this time is very large. In fact, we can completely repair the cable as it was.

How to repair can ensure quality, and repair time is short, but also to ensure that quality is increasingly becoming a cable consumer's general concern. And the small investment, and easy to implement under the harsh conditions of the site, so the repair technology and quality of the field jacket has become a user concerned. Here, according to my own experience, the author discusses the problem of repairing the damage caused by the laying of wire and cable on site.

Cable sheath repair method Cable must be repaired in a timely manner, otherwise over time, external moisture and moisture will enter, will affect the cable's production life. After the laying of cable ends in Meiyu rain in the south, the end of the cable was not sealed in a timely manner, causing the moisture in the cable channel to enter the end of the cable 10-20 meters. The conductors of the insulation were found to be peeled off. All blackened, resulting in the waste of the cable after laying, so the laying of the cable should still strengthen the appropriate aspects of inspection, maintenance and storage, to prevent the cable before the use of electricity on the scene should be a variety of external factors caused by shortening the cable life and end .

For different types of wires, the repair method is not the same. For the repair of low-voltage cable insulation and jacket must be a minor damage to the cable, only damage to the insulation and jacket, the other cable structure is intact, can be carried out Insulation and sheath repair, while the requirements of medium and high voltage cables may be more stringent, and now some of the project's cable transmission in order to reduce the number of intermediate connectors of the cable, the cable all use large-length single-core cable, due to the laying of the line a longer distance Responsibility for the terrain and the number of construction staff and the lack of professional cable laying equipment have greatly increased the chance of damaging the cable jacket during the construction process. In some constructions, after the above-mentioned problems occur, it is irresponsible to use a common tape to pack a bag casually. There is no knowledge about the damage inside the cable breakage point, and the cable is likely to have insulation breakdown or quality problems in the on-site completion test process and the later run process.

Some of the tools and materials used for field repair of cables must be prepared. For example, high-voltage insulating tapes for plastic welding torches, waterproof tapes, and peeled-off skins for plastic insulation and jackets, and other sealing materials are all necessary because of cable insulation protection. Sets of materials are mainly divided into cross-linked polyethylene, polyethylene, polyvinyl chloride and other materials. Some materials are thermosetting materials, such as cross-linked polyethylene insulation can not be repeated melting and reuse, in the field with raw materials for repair, can only be repaired with high-voltage insulating tape and repair tape series provided by the United States 3M company. And some materials are thermoplastic materials, which can be completely melted and used again with high temperature, such as polyethylene, polyvinyl chloride and other materials, and can be obtained on site. The edge sheath cut from the cable ends is cut into thin strips. It can achieve the repair of low voltage cable insulation and sheathing, and its repair quality can fully meet the requirements of normal cable performance.

Specifically, the repair of cables mainly refers to the process of the use of wires and cables. It is easy to cause damage to the outer sheath due to objective reasons. First repair of large joints in the production process: In the production process, due to other reasons in the temporary parking, the jacket is disconnected, continuous joints can be. The method is to cut the plastic sheath into a 45-degree-circular slope shape, retreat to the machine head, extend into the mouthpiece of the mold core for three centimeters, run the glue, run the glue, and drive it by hand. Connect the plastic layer and then plastic repair.

Second, the repair of the general large joints: the two sides of the broken plastic with a knife in the plastic layer along the circumference of a 45-degree angle cut, take a clean, consistent color and thickness, length and diameter consistent with the broken plastic The plastic pipe is cut on the axis of the pipe to an angle of forty-five degrees with each other and is placed on the broken rubber, and the fine copper wire is equidistantly clamped, and then the same plastic bar is used to weld the hot air welding torch. Under the bond welding, and then use copper compaction, compression, flattening.

Finally, there is a quality defect in the length of the cable jacket that is longer than one end of the cable jacket. The other jacket of the other end is well-sealed and the length of the cable is fixed. The method of repairing large joints in the production process can also be used. Only after removing the end cap with quality defects, select a larger die on the extruder. Press the process to squeeze the sheath on one end first. Gradually increase the traction speed at the large joint to gradually make the sheath at the interface. Thinned and covered on the original sheath cut into the slope shape, after the next machine and plastic repair.

From a technical point of view, from the point of view of the above repair methods, the field repair technology for cables is not very high, but some precautions are very important. For example, after the cables are damaged, they must be Make sure that the cables are not damaged inside, and then repair the cables. Otherwise, the practical significance of cable jacket repair is not significant.

The harsh conditions of the on-site construction of the cable bring about other problems, which are the limitations of objective conditions. Because field cable jackets are repaired with plastic welding torches, and the heating of the plastic welding torch needs 220V AC, but in the field of new construction projects, the site generally lacks power, or there may be due to the location of the cable site The supply of power has brought certain difficulties, so to achieve the cable jacket repair, on the one hand is the place of personnel, on the other hand is mainly the supply of power, only to do a good job of the two basic preparations in order to achieve The cable sheath repair works normally and proceeds.

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