Cable construction quality but the consequences will lead to the consequences

First, the outline of cable accessories

1 Characteristics of cable accessories

At present, during the cable construction in China, the cable accessories mainly use chemical synthetic materials as the insulator material of the cable terminal. This material is mainly based on the method of applying high-quality rubber insulation, and it is scientifically processed so that it originally has The good hydrophobic rubber material is further developed, and it also greatly improves its self-healing properties. When water droplets appear on the rubber material, it will automatically generate a layer of film to prevent long-term use. Causes the material to age. Therefore, we can see that the cable accessories have these characteristics: insulation properties, anti-corrosion, water resistance, and some materials also have anti-ultraviolet characteristics, so it has a long service life.

2 The role of cable accessories

In fact, the action near the cable is actually very simple, which is to play a role in connection and stability, so that the voltage from the high voltage to the bottom of the cable to a certain degree, so as to achieve a stable state, the shaft stress of its various terminal power plants And to develop certain changes to the stress, so as to achieve the continuity of the cable.

At present, in the cable construction, the cable is mainly composed of three parts: conductor, insulation, sheath, and shielding. The cable attachment, through its own connection and stability, makes its cable function continuous. In order to achieve a good contact between the conductor and the reliable implementation of the insulation outer layer, thus ensuring the reliability of power supply, so that people's quality of life is not affected, so that the economy can be rapid development.

When we are conducting cable construction, there is a certain degree of uniqueness in the manufacturing process of cable accessories and other electrical components. In addition to ensuring its own stability, we must also ensure the insulation of cable accessories to ensure that There will be no problems in the long-term use of electricity, and the superior waterproofness can also significantly increase the service life of the cable.

Second, the general provisions

1 Cable terminal and street production should be trained by skilled workers.

2 When manufacturing cable terminals and their joints, the production process flow shall be strictly observed, and the oil-filled cable shall comply with the relevant provisions of the oil service and its vacuum process.

3 The three-core power cable is located at the middle of the cable joints. The cable armouring and metal shielding layers shall have good electrical connection and be insulated from each other. At the cable end, the cable armouring and metal shielding shall be led out by the bottom line connection. And should be a reasonable grounding analysis.

4 Corresponding fire-fighting equipment shall be available at the construction site of the interior and its oil-filled cable. Indoor or tunnel construction should have appropriate temporary power supply.

5 In the cable connection, due to the variety of cable terminals and connectors, the rubber roller cable and its accessories are developed in comparison with SHA. In the process of installation, various joint types often affect each other, resulting in unreasonable connection and specification. Incomplete and other influencing factors.

Third, the installation requirements

1 If the single-core cable is shielded by copper wire, the shielded copper wire is turned back after the binding with bare copper wire and left as a bridge line.

2 For single-phase direct laying, ferromagnetic materials should not be used as a protective box. It is recommended to use glass steel or hard plastic protection boxes.

Different from the traditional cable attachment construction process, the construction technology of the prefabricated cable attachment is complicated and the workmanship and technology are difficult. Its installation procedures and process requirements are not easily grasped by the construction personnel. There are generally such problems in the construction and are the impact. The main factors for proper installation and safe operation of cable branch boxes.

When installing the cable, it is necessary to determine the length of the cable accessory through various technical means. The length of the retest is appropriate and flush to prevent the excessively long or short-phase cable from generating a large thrust or pulling force, resulting in a fixed T-type cable connector. Poor contact with the outlet casing of the cable or cable distribution box to prevent leakage of the cable outlet casing due to force.

The cable fixing bracket must be installed in the cable distribution box foundation. The cables are fixed on the brackets at the center of the cable and the following three points should be taken. Measures should be taken to ensure that the three prongs are directly below the terminal to ensure that the cables and accessories in the distribution box are not affected. The pull-down force can effectively avoid the occurrence of air leakage due to stress caused by the outlet box of the cable distribution box.

(3) Put the conductor connecting pipe on the core conductor of stripping long-end cable, crimp it first, remove the burr and flash, remove the metal chips, wipe the cable insulation surface, semi-conductive layer surface and conductor connecting pipe with a cleaning cloth. surface.

4 pre-joint prefabricated parts. Firstly, apply a layer of silicon grease to the insulation surface of the long-end cable, the surface of the semi-conductive layer and the inner hole of the joint preform, and then apply it on the core until the cable insulation is exposed from the other end of the preform.

5 crimp the other end of the core. The joint outer sheath tube is sheathed on the stripped short end-4 cable, and the E shielded copper mesh is respectively placed on the core of each phase core, and the short end cable is inserted into each phase of the core conductor and crimped at the long end. In the connection pipe of the 9-～～core of each phase of the cable, crimping is performed to remove the flash and the burr. Clean the surface of the cable insulation, the surface of the semiconductive layer, and the surface of the conductor connection pipe with a cleaning cloth.

6 Move the joint preform to the joint position. Apply a layer of silicone grease to the insulation surface of the short-end cable, and then pull the connector preform on the long-end cable core to the joint position. Ensure that the stress cone semi-conducting layers at the two ends of the preform are just overlapped. At the ends of the cable insulation outer semiconducting layers at both ends, the specific dimensions are specified in the installation instructions provided by the manufacturer.

The cable attachment is a very important process in the cable construction. The quality problem of the cable attachment directly affects the construction quality of the entire electrical engineering construction. Therefore, during the cable construction process, we must conduct a comprehensive analysis of the various cable countries in order to The guarantee cable can work stably for a long time, which is also the main role of the cable accessory work. At present, in the cable construction process, we mainly use the high voltage to move the cable to the bottom of the cable to maintain the balance of the electric field distribution area at the middle of the cable, in order to ensure the stable operation of the cable, so as to make it reasonable Stable release voltage, improve the quality of power for people to use.