Fireproof cable As the nerve and blood vessel for the normal operation of the national economy, it is the basic material for power transmission, information transmission and various instrument motor manufacturing, and also an important foundation for China's electrification. Nowadays, the wire and cable industry has achieved rapid development with the construction of power and energy networks. Although it is a supporting industry in the electrical field, it accounts for a quarter of the output value in the electrical field. Wires and cables have broad market applications, involving construction, communication, power, manufacturing and other major industries, and are closely linked with all sectors of China's economic activities.
Wire and cable sweat occupies an important position in China's gross national product, second only to the automobile industry. In terms of the gross production value of wires and cables, China has surpassed the United States to become the first in the world. At the same time, China has a complete range of wire and cable products, which have occupied about 90% of the domestic market. With the continuous development of China's wire and cable industry, more and more enterprises have entered this field, and the technical level has also been greatly improved. With the expansion of China's communication industry, power, rail transit, and automobile industries, the market demand for wires and cables is also increasing, and there will be greater development potential in the future. According to the statistics of the "China Wire and Cable Industry Report" of the Prospective Industry Research Institute, the output of wires and cables in China has been increasing in recent years, which has reached nearly 60 million kilometers. Moreover, this trend of rapid growth will continue in the future.
However, unlike the rapid increase in the output of the wire and cable industry, there are still many problems in the whole industry. The development level is not high, the quality level is low as a whole, and the quality qualification rate has been at a low level during the random inspection of products, resulting in the current situation of large but not strong wire and cable industry in China. In addition, although China's wire and cable production ranks first in the world, the overall overcapacity is also serious. At the same time, the concentration of the industry is low. Although there are many enterprises, their business scale is generally small, which also affects the innovation ability of enterprises and the progress of the industry. Therefore, most products are concentrated in low-end fields.
Due to the lack of access threshold in the wire and cable industry, some entrepreneurs failed to keep up with their ideas, had a strong sense of competition, blindly expanded production scale, lacked the sense of peer cooperation, and failed to create a reasonable product structure, resulting in repeated investment, serious homogenization and other phenomena. In the production link, the whole industry is short of technical talents, and enterprises do not invest too much in talent training, but tend to poach people from each other, resulting in too fast flow of skill person times, and it is difficult for enterprises to form technology precipitation and other problems. Moreover, another factor hindering the development of the wire and cable industry is the sales link. The soft constraints and weak organization of the sales department have also become obstacles to the development of the industry.
Low pressure power cable : It is applicable to the power transmission and distribution lines with AC 50Hz and rated voltage of 3kv and below; Usage characteristics: the maximum rated temperature of cable conductor is 90 ℃. The maximum duration of short circuit shall not exceed 5 seconds. The maximum temperature of cable conductor shall not exceed 250 ℃. Medium and low voltage power cables generally refer to 35kv and below: PVC insulated cable , polyethylene insulated cable, cross-linked polyethylene insulated cable, etc. High voltage power cables are generally 110 kv and above: polyethylene cables and cross-linked polyethylene insulated cables; Extra high voltage cable 275-800kV; UHV cables 1000 kV and above.
