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WeiKeru Cable Co., Ltd. is the original Renqiu Hualong Cable Factory, which was founded in 1998. It is located in the Beijing-Tianjin-Baojiao Trade Fair, adjacent to the Beijing-Kowloon Railway... -
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After many years of support from users and friends from all walks of life, and the unremitting efforts of all employees, the original low-voltage power cables, control cables, overhead insulated cables... -
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Obtained China's compulsory product CCC certification on July 27, 2015, and is currently recognized as an AAA credit enterprise, and has obtained quality management system certification, environmental management system... -
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All employees have always followed the company philosophy of "scientific and technological innovation, customer satisfaction, and service to the society", making friends, cultivating the market, improving product quality... -
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The market share is increasing year by year, and the products are sold in 26 provinces, cities and regions across the country. High-quality products and sound after-sales services have been selected by key projects...
Do you know what problems are prone to occur in the operation of wires and cables?
Release Time:
Jun 02,2023
As my country's industrial level is getting higher and higher, it can be said that wires and cables are everywhere. In recent years, the construction of cables into the ground has also developed very rapidly. However, with the increasing number of cable lines and the increase in operating life, cable faults Gradually increasing, the faults of the cable body, cable accessories, and cable auxiliary equipment that occurred during the cable operation also increased significantly. The reasons for these faults will now take everyone to take a look.
As my country's industrial level is getting higher and higher, it can be said that wires and cables are everywhere. In recent years, the construction of cables into the ground has also developed very rapidly. However, with the increasing number of cable lines and the increase in operating life, cable faults Gradually increasing, the faults of the cable body, cable accessories, and cable auxiliary equipment that occurred during the cable operation also increased significantly. The reasons for these faults will now take everyone to take a look.
With the increase and accumulation of cable service time, the cable is most likely to have problems with insulation aging. The reason for this may be that the cable was not selected for the appropriate model when it was laid, resulting in the long-term work of the cable under overvoltage or the cable line. There are close to heat sources around, so that part of the cable or the entire cable line is heated for a long time and prematurely aged. The working environment of the cable is also a factor that affects the life of the cable insulation layer. If it is used in an environment with adverse chemical reactions, or multiple cables run in parallel but one or several of them are in poor contact, it will also cause other parallel cables to overheat. The load operation causes failure. When the cable accessories are made, the cable connection tube is not crimped firmly, resulting in an increase in contact resistance and causing overheating. These are the causes of insulation failure and must be avoided reasonably.
Accessories are also very prone to problems, and this ratio is also very high. The reason is that the cable intermediate joints and terminals are usually completed by the installers on the laying site. Problems with accessories will affect composite interface discharge and material aging of accessories. The problem of accessories is often due to the poor production process and poor product quality. During the production process, defects such as air bubbles, moisture, and impurities appear inside the accessories, which cause partial discharge and cause insulation breakdown. Not only must you choose high-quality accessories, but also Nor can it be neglected.
The problem of the outer sheath is also relatively common. In the medium and high voltage power grid, the outer sheath of the wire and cable is the first line of defense to protect the cable. Whether it is intact or not is directly related to the safety of the internal structure and the length of the cable's service life. The reasons for the problems of the outer sheath are: there are hard objects on the top and bottom of the direct-buried cable, and the sharp corners directly contact the outer sheath, especially in the section where vehicles pass, and the road vibrates for a long time, and the sharp corners of the hard objects may pierce the outer sheath. As a result, the internal structure is damaged, coupled with the change of the cable load, the thermal expansion and contraction of the cable itself and the uneven distribution of the electric field at the damaged part, resulting in damage to the insulation layer; It may cause damage to the outer sheath; mechanical construction or pipe jacking operations around the cable path may cause damage to the outer sheath.
During the laying construction process of the cable, the outer sheath is pulled and the cracked part is in the pipe, so it will not be found in time; after a period of operation, cracks will occur, the insulation of the outer sheath will be reduced, the metal sheath will be grounded at multiple points, and the circulation will increase. Large, eventually lead to thermal aging breakdown of insulation. Termite erosion is also one of the reasons for the appearance of the outer sheath. Once a termite erosion site is found, there should be multiple corrosion areas on the cable line, and we should pay enough attention to it. Termites are dangerous to eat and eat, relatively speaking, they rarely appear in the north.
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