In dry type transformer, on the basis of independent development, the introduction of Germany, Switzerland, Italy, Portugal and other countries more than about 10 kv, 35 kv < 0 > series of design, manufacturing, and other technology, and already the batch production of 10 kv, 35 kv < 0 >, now can produce a maximum voltage level of 110 kv, single phase for dry type transformer of 10500 kVA capacity, product quality has reached the introduction of the technical level of similar products abroad.
In the high voltage, ultra-high voltage design, in addition to carrying out scientific and technological research, independent development, since entering the 1980s has also introduced Hitachi, Toshiba, ABB, Mitsubishi, Siemens and other companies manufacturing technology. At present, in the ultra-high voltage 500kV transformer manufacturing, from the initial majority of the dependence on imports, developed to today can be quite competitive with imported products. With the construction needs of the Three Gorges Project, the introduction of Siemens transformer manufacturing technology, in the left bank of the Three Gorges Hydropower Station application of 84KVA three-phase transformer manufacturing, China has cooperated with foreign companies, each set to undertake about 30% of the manufacturing share; The key parts of Siemens' design and manufacturing technology have been fully mastered. The manufacturing of transformers used in the right bank of the Three Gorges Project is required to be contracted in China by applying Siemens technology, which creates conditions for participating in the bidding.
All these show that, after the reform and opening up, in the power transformer science and technology, technology introduction, digestion and absorption, science and technology innovation and other aspects have achieved positive results; It has played a positive role in mastering the manufacturing technology of various types of transformers, improving product performance, improving product quality, shortening product development cycle, expanding product output and increasing product variety.
Manufacturing enterprises through years of capital construction and technical transformation, the power transformer industry has been greatly improved, China's transformer manufacturing industry will gradually approach the world's advanced level. With the development of the power industry, the domestic power transformer manufacturers have carried out construction and transformation according to the requirements of the plan. According to incomplete statistics, there are about 2000 power transformer manufacturers in the country. According to the statistics of 900 large-scale manufacturers at the end of the "Eight-Five" period, the capacity of transformer production is about 150 million KVA every year. In 2000, a total of more than 300,000 transformers were produced, with a capacity of about 180 million KVA (among which 10kV and 35kV voltage levels account for more than 90% of the total number), equivalent to more than 1/5 of the world's total output. It can be said that China is the world's power transformer production country, is also the application of power transformer power.
There are 7 manufacturers with 500KV production capacity in China, among which 5 are capable of mass production. The annual production capacity has exceeded 30 million KVA. In recent two years, the annual production capacity is about 20 million KVA, accounting for about 11% of the total output. There are about 25 manufacturers that can produce 220KV level. In the last two years, about 30 million KVA are produced annually, accounting for nearly 18% of the total capacity. There are about 100 manufacturers that can produce 110KV class. In the last two years, about 1000 sets are produced each year, with a capacity of 30 million KVA, which also accounts for nearly 18% of the total capacity. Among them, there are 5 manufacturers with an annual output of more than 100 sets, such as Xinjiang TBEA Electric Company, Heng Transformer, Shen Transformer, Baoshan Transformer and Huapeng. There are about 100 manufacturers of dry-type distribution transformers, and there are 4 manufacturers with production capacity of more than 100KVA, such as Shunde, jinxiang, Xuji and Huapeng.
According to the statistics in 2000, the national production of dry transformer 16 million KVA accounted for nearly 9% of the total output of power transformer (the national production of dry transformer capacity of 30 million KVA); There are 3 manufacturers of SF6 insulating dielectric transformers, mainly producing 10kV voltage grade products, and the output is very small, and higher voltage grade is being developed. Adapt to the requirements of urban network and residential areas, there are also some manufacturers began to produce buried transformers; There are many manufacturers of box-type transformers. According to incomplete statistics, there are about 600 manufacturers with an annual production of about 7,000 sets, among which about 20 have an annual production capacity of more than 200 sets.
Electronic transformer demand exuberant in recent years, electronic transformer technology development goal is light weight, high efficiency, high density, chip products will also be further developed. Due to the continuous development of household appliances and electronic equipment, the demand for low-voltage electronic transformers is growing, therefore, high-definition TV and high-frequency display with sweeping transformers become the main areas of concern for manufacturers, among which the demand for acycleless sweeping transformers will have a greater growth; High frequency, low loss, small size, low price of power transformers will also occupy a large market; The market outlook for high voltage power transformers is encouraging.
At present, the market size of the world's electronic transformers is basically maintained at about $6 billion ~ $7 billion, accounting for about 7.5% of the world's total electronic component market. Among them, the production and consumption of Japan accounted for 43% and 40% of the world market respectively, while the production and consumption of the United States accounted for 17% and 22% respectively. The production and consumption share of other Asian countries and regions rose rapidly to about 13% and 8% respectively.
Since China's accession to the WTO, the domestic electronic transformer market competition is basically in a stable state, no greater impact, this is because the electronic transformer products are labor-intensive and custom-made products based on user requirements. With many varieties and specifications, many production batches and large quantities, it is not suitable for automation and large-scale production. With the increasingly fierce competition in the market, in order to reduce costs, production is shifting to areas with low labor costs.
At present, the production of electronic transformers in China presents the following characteristics:
Medium frequency transformer production is large, the price is low, and mainly to export, export to drive its rapid development. At present, the industry average price of intermediate frequency transformer in China's electronic system enterprises is 0.626 yuan/piece, but the average ex-factory price of most enterprises is between 0.20 ~ 0.30 yuan/piece, and the highest is about 1 yuan/piece. Since the product is mainly exported, its price is completely determined by the international market. With the increasing popularity of digital audio electronic products and the wider adoption of integrated circuits, audio transformers are no longer used in new color TV sets, and the market share of audio transformers is constantly declining.
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