Indispensability in all economic activities and social life
In modern society, where there are crowds of people living, where there is production, transportation, and all the economic activities of the occasion, where the cosmic space, the underground, the ocean and other needs to be explored, developed all the activities, as well as any one of the development of scientific and technological development of innovative projects in the research and development activities, can not be separated from the power and electromagnetic waves. Application. And electricity and electromagnetic wave generation, transmission and application must be used wire and cable as a connection, transmission components or as a host of winding materials. In fact, all industrial production, transportation, construction and facilities, modern agriculture and scientific research, military equipment or military facilities, space, ocean exploration and social life (including every family and people's daily life) are closely related to wire and cable products.
So in this industry has been used in the power system wire and cable than the human body as blood vessels (home and office power lines than as "microvascular"); electromagnetic wave information transfer wire and cable (fiber-optic cable) than the human body's nerves; will be made into motors, instrumentation windings (coils) with the electromagnetic wire than as an important part of the heart. Important parts of the heart. To illustrate the indispensability of wire and cable in all economic activities and social life.
Timely to meet the system or device upgrades in various fields, the development of innovative supporting
Since the mid-twentieth century, with the science and technology to mutate, innovative way of leaping forward, the content of human economic activity from the depth of the breadth of a step-by-step comprehensive development has occurred. At the same time, the people's living standards and quality of life continue to improve, are prompted as a supporting or connecting parts of the wire and cable varieties continue to update the development of the amount continues to increase. If the supporting development can not be completed in a timely manner, it will delay the development of the main system or the main equipment, resulting in a great impact. For example, the exponential increase in electricity consumption requires the transmission voltage level by level, the voltage of China's power transmission grid has been increased from 220kV to 500kV, may be further increased; build highly intelligent buildings, there will be for hundreds, thousands of electronic computers hierarchical networking computer network cables; to build the city's public **** cable television network, the city and even the country all the bank's pass through the exchange of funds to carry out on-line Economic transactions and information exchange, etc., there must be a high speed, low loss and high reliability transmission of broadband cable (or fiber optic cable) network; in order to ensure the reliability of communications and data transmission and privacy, the world's continents between countries, through the Pacific Ocean, the Atlantic Ocean, and other major oceans between the construction of a number of up to a few thousand nautical miles long fiber optic cable trunk line; to achieve the military artillery or anti-aircraft gun group of remote-control procedures for launching, there must be suitable for harsh environments in the field. There must be suitable for the harsh environment of the field control, signaling, measuring cables; artificial satellites in the wires and cables must be resistant to high temperatures, resistance to electronic radiation in space, and even its instrumentation to be used in the diameter of micron-level micro-fine insulated wires; aircraft or high-temperature furnaces occasions require the use of temperature 500 ℃, 1,000 ℃ level of ultra-high-temperature measurement and control of wires; medical X-ray machines, CT machines must be DC ± 100kV, ± 200kV level of high-voltage flexible cable, the cable must be used to ensure the safety of the equipment, and to provide the best possible protection. 200kV level of high-voltage flexible cable; cardiac pacemaker must be inserted into human blood vessels, very fine but harmless to the human body of the special wire; modern agriculture, the rapid development of factory, prompted the development of a variety of special cables, such as soil heating cable, self-control temperature cable.
As for all the need for fire prevention occasions and must have a variety of grades of flame-retardant (non-flame retardant) or fire-resistant wires and cables; there are also a variety of biological damage - such as anti-rodent, anti-termite, anti-mildew, anti-bird pecking wires and cables; for the need to prevent the safety of public **** occasions, such as finance, hotels, security residential areas As well as museums and so on, to be installed on the automatic detection head and centralized display of the monitoring system, you have to install a special radio frequency cable network, and so on, the list goes on.
In the national economy occupies a considerable proportion, a large number of broad product categories
Because wire and cable has been widely used in the operation of the economic system in the facilities, equipment, equipment, especially the huge power transmission system and information transfer system, and serves all the social activities and in-depth into the daily life of every family and individual, so the wire and cable products have reached the Ubiquitous state. And still with the content of socio-economic activities from the depth to the breadth of the development of step jump; coupled with people's standard of living and quality of life requirements continue to improve, and still continue to promote the development of wire and cable product varieties and increase in production. Therefore, in the mid-twentieth century nineties, a futurist had predicted: the twenty-first century will be the line (wire and cable) of the world.
China's cable industry in 1949 after the founding of New China, from scratch, developed by leaps and bounds. So far, both the level of technology and equipment or product technology level have reached and close to the world's advanced level. Especially from the amount of copper (including aluminum conversion value) and the total output value will be, the scale of China's cable industry in the world within the top three. For example, in 2000, the total output value of China's cable industry has reached 90 billion yuan, accounting for about 1% of the country's gross national economic output value, accounting for about 4% of the total output value of the electromechanical industry, electrical machinery and electrical appliances industry 17%. In the electromechanical industry, 135 industries, the output value of the second largest after the automobile industry and ranked second.
It should be noted that the demand for cable products and the national economic growth rate and the improvement of people's living standards are closely related to the amount of inputs with the basic construction of a more direct relationship, which is the conclusion of decades of statistical analysis.
In 1995, the country's third industrial census counted the number of wire and cable production enterprises for 4752 (including non-independent accounting units), of which small enterprises accounted for about 95.7% of the total. In 1997, the National Bureau of Statistics announced the number of independent accounting enterprises was 2,738, of which the annual output value of more than 5 million yuan of enterprises there are 1,591. The statistics show that the industry is characterized by many small and medium-sized enterprises, many new enterprises and unreasonable geographical distribution. There are about 60 to 70 enterprises with an annual output value of more than 100 million yuan, and the largest enterprise has an annual output value of more than 2 billion yuan. The number of employees in the industry is more than 400,000 people.
The scale of products, for example, the annual output of power cables has reached about 25 million kilometers (of which 6-35kV medium-voltage cables up to more than 50,000 kilometers, 110kV and above the high-voltage cables up to more than 200 kilometers), the annual output of general-purpose insulated wires (plastics, rubbers) more than 10 million kilometers, the copper telephone cable 80 million pairs of kilometers, all kinds of fiber-optic cables of 10 million core kilometers, and the enameled wire more than 300,000 tons. Enameled wire about more than 300,000 tons. These illustrate the large volume of wire and cable products and the characteristics of the national economy occupies a considerable proportion.
Requirements for the safe and reliable operation of the product is particularly important for wire and cable
In the power or information system network, wire and cable products are distributed according to the size of the system, high and low graded set up and extend the degree of continuous extension of the building blocks. That is, in a system from high to low, from large capacity to small capacity are "connected", once any failure will affect the whole system. Of course, from the principle of system protection facilities, if the end of the problem, can be isolated locally (i.e., the scope of the accident is small), but if the high-end (front-end) or the middle of the wires and cables, once due to external forces (such as road construction) or aging of the product caused by accidents, it is necessary to affect a large area. Especially the trunk line, as if the human body's aorta (power lines), the main nerve (information transmission lines). For example, from a large power station to a region to send power to the 500kV transmission line, up to hundreds of kilometers, thousands of kilometers (such as the Three Gorges - Shanghai), if any one of them occurred in the electric breakdown or mechanical fracture, will cause a large area of the region's power outages, bringing incalculable losses. There are many examples of this at home and abroad.
Also, wire and cable is distributed along the length of the entire region, it is not like a motor, transformer or information transmission equipment, program-controlled switches, etc. mounted on a "node", easy to control and maintain; if a "node" Failure, generally does not involve other "nodes". Coupled with the wire and cable products generally can not be repaired, can only be replaced. Therefore, the long-term safe and reliable operation of wire and cable products is particularly important.