目录：common problem发布时间：2019-12-16 17:27:00点击率：
[Three major problems exist in low-voltage complete switchgear]: After entering the 1920s, due to the increase in investment in infrastructure and electrical energy, the low-voltage complete switchgear industry began to have a large space for development. The development of the industry is manifested in the large increase in manufacturers, the speed of product refurbishment, the increase in varieties, and product standards ...
After entering the 1920s, due to the increase in investment in infrastructure and electrical energy, the low-voltage complete switchgear industry began to have a large space for development, and the market demand has increased year by year, which has stimulated the development of the industry, which is reflected in the large increase in manufacturers. The speed of product renovation is accelerating, the variety is increasing, and the standards of products are gradually approaching international standards.
Low-voltage complete switchgear is responsible for the control, protection, measurement, conversion, and distribution of electrical energy in the low-voltage power supply system. As the low-voltage complete switchgear goes deep into production sites, public places, residential houses and other places, it can be said that all places where electrical equipment is used should be equipped with low-voltage equipment. About 80% of China's electrical energy is supplied through low-voltage complete switchgear. The development of equipment originates from the materials industry, low-voltage electrical appliances, processing technology and equipment, infrastructure construction and people's living standards, so the level of low-voltage switchgear equipment reflects the economic strength, science and technology, and living standards of a country from one side. China's low-voltage switchgear was basically in a stagnant state before the 1970s, mainly reflected in the single product variety, poor quality, low technical parameters, backward process equipment, constant product types and backward standards (at that time There is only one standard JB617). After entering the 1980s, due to the increase in investment in infrastructure and electric energy, the low-voltage complete switchgear industry began to have a large space for development. The market demand has increased year by year, which has stimulated the development of the industry, manifested in manufacturers. With a large increase, the speed of product renovation is accelerating, the variety is increasing, and the standards of products are gradually approaching international standards. Product technical performance parameters have been significantly improved, and the factory's processing technology and equipment have been significantly improved. Hundreds of manufacturers have introduced advanced foreign CNC sheet metal processing equipment. Some factories also have flexible processing lines and their sheet metal processing technology. Has reached the international level. In addition, a number of professional manufacturers of profiles and cabinets and electrical accessories manufacturers have appeared in the industry.
1, Low-voltage switchgear
At present, the manufacturers of low-voltage power distribution products in China are mainly distributed in East China, South China, and North China, especially in Jiangsu, Zhejiang, Guangdong, Fujian, and Beijing and Tianjin. These regions have rapid economic development, and their production capacity and product level are relatively high. In the northwest and northeast regions, except for individual enterprises, the overall level is relatively poor.
At present, there are more than a dozen varieties of power distribution equipment developed in China, including fixed panel type, fixed partition type, withdrawable type, mixed type, and intelligent type. The product design level has reached the international level in the mid-1990s.
2, Busway products
The production process of busway products is relatively simple, so manufacturers that can produce low-voltage complete switchgear can produce busway, and there are also some manufacturers that specialize in producing busway. Due to the different economic conditions in various regions, the distribution and output value of enterprises are also very different. Busbar trunking production enterprises in coastal and economically developed areas started earlier, developed faster, and were more numerous. For example: Jiangsu, Zhejiang, Shanghai, Guangdong and other places, but because of the low technical content of the product, the requirements for the factory's technology, processing equipment, etc. are low, coupled with less investment and quick results, making the strength of manufacturers uneven. There is a considerable gap in product quality. In general, the level of busway products in China (except for some joint ventures) is not far from foreign products.
3. Existing problems
虽然 Although China's low-voltage complete switchgear has greatly improved in terms of output and output value, the product variety and performance are far from meeting market demand. On the one hand, there is fierce competition among several types of products, and on the other hand, some product markets are occupied by foreign manufacturers.
According to industry experts' analysis, the main problems in China's low-voltage complete switch industry are as follows:
(1) The product structure is not reasonable enough.
Low-voltage complete switchgear should have the characteristics of multiple levels and varieties. The so-called multi-level means that similar products should have high, medium and low differences in technical performance, parameters, functions, structure, installation, etc. to meet the needs of different industries. Multi-variety refers to products that meet the needs of different use environments, such as moisture-proof, dust-proof, anti-corrosion, and waterproof, which are used in the field. The vast majority of products currently available in China are products used in general environments. Fixed-spaced products with higher parameters, high protection levels and high degree of automation, and products with multiple functions are basically blank.
(2) The company's independent development capability is poor. The characteristic of the industry is that there are many manufacturers, but the scale is small. The vast majority of manufacturers have weak technical forces and do not have the ability to independently develop products. Basically, they are produced through technology transfer or imitation in the industry. Therefore, product types are concentrated and market competition is fierce. Although a few companies have the ability to develop on their own, due to the long period of market opening, and the above difficulties, and once a certain market size is formed, other factories can easily copy and enter the market, which seriously affects the company's self-developed products. Enthusiasm.
(3) There is not much difference in product quality, there is no brand-name product. In order to improve the processing and product quality of enterprises, many manufacturers have introduced high-precision sheet metal processing equipment, but they are relatively backward in terms of assembly technology, busbar processing technology and equipment, and are at the same level among enterprises. For several products, there are professional profile production plants, auxiliary parts production plants, and even casing production plants. In order to shorten the production cycle and meet the needs of diverse markets, many companies directly purchase casings for assembly. In this way, even with high-precision sheet metal processing equipment, it is difficult to exert its advantages. In this case, it is difficult to produce high-quality brand-name products.
(4) The main problems of low-voltage switchgear itself:
①Materials used in low-voltage switchgear:
At present, there are many accidents of low-voltage complete switchgear in China due to unqualified flame retardancy of insulating materials.
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