The transformer manufacturing industry is developing towards environmental protection, miniaturization and high reliability

The transformer industry is closely related to the national grid construction policy. At present, the Chinese government and industry authorities attach great importance to the contradiction of imbalance in power grid and power supply investment, and are committed to solving the problem of lagging power grid construction and weak grid structure, so as to adapt to the rapid growth of power demand and realize the comprehensive and coordinated development of power grid and economy and society.

During the "Eleventh Five-Year Plan" period, the state increased investment in the power grid, with the investment of the State Grid Corporation of China being 1,215 billion yuan and the Southern Power Grid Corporation of 234.1 billion yuan; During the "Twelfth Five-Year Plan" period, the State Grid has invested a total of 1.8 trillion yuan in the power grid. During the "13th Five-Year Plan" period, the investment in the construction of the State Grid will reach about 2 trillion yuan. The state has also made plans for the medium and long-term development of the power grid according to the development pattern of the power industry, environmental policies, energy strategies, economic development and other factors, but if the country's medium and long-term investment in the construction of the power grid shows signs of decline and slowdown, the future business performance of transformer manufacturers will be directly affected. In recent years, the number of finished products in China's transformer manufacturing industry has been increasing. According to the data of the "Market Demand Forecast and Investment Strategic Planning Analysis Report of the Transformer Manufacturing Industry" released by the Prospective Industry Research Institute, in 2014, the finished products of the transformer manufacturing industry were 19.045 billion yuan, a year-on-year increase of 10.04%. In 2015, the finished products of the transformer manufacturing industry were 19.226 billion yuan, a year-on-year increase of 0.95%. In 2016, the finished products of the transformer manufacturing industry were 19.973 billion yuan, a year-on-year increase of 3.89%.

Analysis of the development trend of China's transformer manufacturing industry With the rapid development of China's economy and the increasing demand for electricity, transformers, as the main equipment in the power transmission and transformation system, have also made great progress. In order to adapt to and meet the market demand, many transformer manufacturers have introduced advanced production technology and equipment from abroad in order to continuously improve the product structure and improve product performance, and strengthen the exploration of new processes and new materials

(1) To the development of large capacity, high voltage and high reliabilityAt present, transformer products are divided into high-end transformers, 220-500kV transformers, 110-200kV transformers and transformers less than 110kV according to voltage levels. The higher the voltage level of the transmission and transformation line, the greater the transmission and transformation capacity, so the overall development direction of the transformer is that the voltage level will develop to 750kV and 1000kV, which is mainly used in long-distance transmission and transformation lines; The capacity is developed from 120MVA-840MVA or even 900MVA for three-phase and 250MVA-400MVA for single-phase, and even 533MVA. Since these transformers are typically used in large power stations or power transmission, their reliability is critical.

(2) With the continuous improvement of national environmental protection laws and regulations and the enhancement of people's awareness of environmental protection, the construction of substations, especially the construction of urban substations, is more and more restricted by environmental protection. Among them, the energy consumption, noise and electromagnetic field generated by transformers and reactors in operation are the environmental impact factors that should be considered in the design of substations, distribution network layout or environmental protection assessment. To this end, the transformer is required to be environmentally friendly first, which is mainly reflected in four aspects: energy saving, low noise, non-permeability and degradable recycling.

(3) The development of current power supply products to miniaturization and portability is generally characterized by "light, thin, short and small" to miniaturization and portability. For example, electronic transformers must be adapted to the volume and weight requirements of the user's power supply products. At the same time, the price of raw materials (core materials and conductive materials) for electronic transformers has risen. Therefore, how to reduce the volume and weight, and how to reduce the cost have become the main direction of the development of electronic transformers in the future. Energy-saving, miniaturized, low-noise, high-impedance, explosion-proof development of such products are mainly small and medium-sized, such as the new S9 distribution transformer that is currently recommended in the transformation of urban and rural power grids, as well as coiled core, amorphous alloy, fully sealed, combined, dry-type, high ignition point oil, SF6 gas insulated transformers.

(4) The development of urban transformers for urban power grids in the direction of high impedance, urban transformers should have the characteristics of high reliability, energy saving, environmental protection, low noise and miniaturization. Substations in cities are sometimes individually designed, affecting the structure and shape of the transformer, and even the type and type of cooling.