The teacher taught you how to patch the faulty cable at the construction site

In the field of cable laying cable sheath surface scratches damaged phenomenon is widespread, damage only minor damage to the sheath, how to repair can guarantee quality, and repair time is short, but also to ensure that the quality of the cable has become increasingly consumption Generally concerned about the problem. And put into small, in the harsh conditions of the site and easy to achieve, so the field of patch repair technology and quality has become a user concern. The construction conditions of the cables are generally harsh. They may be located in the preliminary construction of the power plants, or may be located in the initial construction of the new railway in the wild, may be on the bridge, and may also be in the cable tunnel. As the field cable sheathing is repaired by using plastic Welding torch, and plastic welding torch heating requires 220V AC, and in the emerging construction of the field project, the general lack of power on site, or the power may be due to the location of the cable laying site immediately, to provide a certain amount of power supply Difficult, so to achieve the repair of the cable jacket, on the one hand, the staff in place, on the other hand mainly the provision of power, and only make the above two basic preparations in order to achieve the normal cable jacket repair work carried out . In order to facilitate the smooth progress of the cable repair work, the construction unit should be equipped with a small field generator. At the same time at the scene to facilitate the repair Now the quality of plastic welding torch to perfect. Sprinkler heating area to be large, and heating faster. In addition, the damaged parts of the cable laying process are random. This work is carried out well in normal cities and plains. However, in some mountainous areas, the repair of cables is actually very difficult because of the influence of complicated terrains. Therefore, to reduce the corresponding aspects of investment and solve problems quickly, a key issue is that the number of cable laying staff must be sufficient, and the use of formal laying equipment professional formal cable laying to avoid and reduce the cable laying process Damaged jacket. Cable repair field needs technology is not very high, cable laying construction units, in the event of damage to the cable, the cable must be confirmed within the premise of no damage, and then repair the cable, or cable sheath repair the actual It is not meaningful. Cable repair must be timely, or a long time outside the moisture and moisture to enter, will affect the cable's production of life. In the southern rainy season after the end of the laying of the cable is completed, the end of the cable because there is no timely sealing process, resulting in the water into the cable trench into the cable break 10-20 meters, stripping the end of the insulation found conductor Has been completely black, resulting in the laying of the cable after the waste, so the laying of the cable is still to strengthen the corresponding aspects of the inspection, maintenance and storage, to prevent the cable before the power on the site should be a variety of external factors shorten and shorten the life of the cable . Some of the tools and materials used in the field repairs of cables must be prepared. Plastic welding guns are required. High voltage insulating tapes, waterproof tapes, and plastic insulation and sheaths are peeled off from the leather, etc. Sealing materials must also be prepared because cables Insulation jacket material is 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 reused melt reuse, repair with raw materials in the field, only with high-voltage insulating tape and the United States 3M patch tape repair series. Some materials are thermoplastic materials, and can be reused with high temperature melt utilization, such as polyethylene, polyvinyl chloride and other materials, there can be drawn on the scene, the use of cable ends cut off the corner sheath material cut into thin strips, on Can be achieved on the low-voltage cable insulation and sheath repair, the quality of its repair can be achieved normal cable performance requirements. Another one for the medium voltage cable laying process jacket damage phenomenon can not be too rough, one is the cable laying process must take hold, and then a cable external damage, the internal damage is sometimes the case of insulation Not easy to say, I had on-site laying process of construction accidentally caused a number of damaged outer sheath of the cable for the factory test and found that the damaged parts of the cable there partial discharge exceeded and breakdown phenomenon, so for medium voltage power cable It is best to cut off the middle connector or replace the cable after laying the outer sheath in the process of site laying, because there may be hidden dangers of using the jacket after the damaged part of the cable is repaired. It has been proved that for the repair of low-voltage cable insulation and sheathing, the cable damage must be minor, only the insulation and sheathing are damaged, and the rest of the cable structure is intact, the insulation and sheathing can be repaired, while the medium- and high-voltage Cable requirements may be more demanding, some of the current project cable transmission in order to reduce the number of cables in the middle of the joints, the cable length of all single-core cable, due to the laying of a long distance and the terrain responsible for the construction and the number of staffing And lack of professional cable laying equipment and other factors, the construction process caused a substantial increase in the probability of cable jacket damage. Some construction in the emergence of the above problems, just use ordinary tape to pack a bag, hastily, this approach is irresponsible. For cable damage point of ignorance of the internal damage situation, the cable in the field of completion of the test process and the latter part of the operation process is likely to occur insulation breakdown or quality problems.