As one of the effective energy-saving methods, energy-saving transformers have very good prospects on some large-scale power networks. However, due to the low-cost energy-saving transformers, many unqualified products have flowed into practical applications, causing some economic losses. .
Power transformers are the key electrical equipment for power transmission. Transformer losses account for 30% to 40% of grid losses, while all transformers in China account for more than 2% of national power generation. Reducing transformer losses and improving power transmission and transformation efficiency are the current concerns of all countries in the world. They are also the focus of government agencies and power units at all levels to grasp the energy conservation of industrial products. On November 6, 2012, Zhang Lingyu, head of the EU-China Energy Saving Transformer Promotion Project Team, said at the 2012 International Forum on Transformer Energy Efficiency. At the same time, many companies in the forum reflected that problems such as backward standards, overcapacity and market chaos have also arisen. How to continue to promote the development of energy-saving transformers has become the focus of the industry.
During the 11th Five-Year Plan period, benefiting from the vigorous development of the power industry, the transformer industry maintained a steady and steady growth trend. According to data released by the China Electricity Council, in 2010, the nation's infrastructure new power generation capacity was 91.27 million kilowatts, and the national power generation equipment capacity was 96,219 kilowatts. During the 11th Five-Year Plan period, the nation's power installations continued to cross the 600 million, 700 million, 800 million, and 900 million kilowatts, with an average annual growth rate of 13.22%, meeting the strong demand for electricity from economic development. At the same time, China's power construction is developing rapidly, and the demand for transformers is rapidly increasing. As a result, a considerable number of domestic transformer companies are rapidly expanding their production capacity, and even individual enterprises have doubled their production capacity. According to statistics, there are about 1,500 transformer manufacturing enterprises in China with an annual production capacity of about 3 billion kVA. In the past three years, the annual demand for transformers in China is at most 1.5 billion kVA.
At the same time as the investment in power infrastructure construction has increased, the construction speed of China's power grid has also accelerated significantly, and its scale has continued to expand. By the end of 2011, the total number of distribution transformers in China was approximately 13.5 million units, of which 2.94 million were energy-saving distribution transformers of S11 and above, accounting for 21.8% of the total; the total number of public distribution transformers was about 2.975 million, of which S11 The above energy-saving distribution transformers are 1 million units, accounting for 33.6% of the total; the total number of dedicated distribution transformers is about 10.525 million units, of which 1.94 million are energy-saving distribution transformers of S11 and above, accounting for 18.4% of the total; The total number of amorphous alloy distribution transformers is about 110,000, accounting for 0.8% of the total. Among them, urban distribution network accounts for 70,000 units, and rural distribution network accounts for 40,000 units.
However, at present, overcapacity has led to fierce competition. Many enterprises have gone to the vicious circle of low-price bidding. The quality of transformer products has dropped, and the accident rate has been repeatedly criticized by the industry. In the fierce competition environment, the economic benefits of domestic transformer enterprises have dropped significantly. At the same time, the energy-saving distribution transformer market is scattered, and the quality supervision of some products is not enough. As a result, some enterprises with poor quality and small capacity are arbitrarily promised, and they are arbitrarily quoted. Through the method of cutting corners and reducing materials, the quality of the products is mixed, which disrupts the normal market order and the bidding order. Many companies are on the verge of loss or bankruptcy, facing the fate of mergers and acquisitions; some companies have begun to take overseas routes, export products, and build factories abroad; some companies have begun to develop new, energy-saving, environmentally friendly, and intelligent products.
At present, there is a lack of uniform definition and definition standards for energy-saving distribution transformers. There is an urgent need to unify the definition of energy-saving distribution transformers and define their substantive technical indicators. These indicators should be quantified and refined as much as possible, especially with operability. Further improve the national standards for energy-saving transformers and keep up with the international pace
