Transformer Energy Efficiency Improvement Plan (2021-2023)
01Main materials and processes for the development of high-efficiency transformer industry
(1) Positive progress has been made in the production and manufacturing capacity of iron core materials
During the Thirteenth Five-Year Plan period, my countrys transformer core material manufacturing technology has achieved rapid development. The core materials suitable for high-efficiency transformers mainly include high magnetic induction oriented silicon steel and amorphous alloys. High magnetic induction oriented silicon steel has achieved mass production. At this stage, my countrys high magnetic induction oriented silicon steel product specifications are relatively rich, which can basically meet the needs of the domestic market, and the domestic high magnetic induction oriented silicon steel has a high market share.
(2) The high-efficiency and energy-saving core structure has realized industrial application
The three-dimensional wound core structure transformer has experienced decades of development from the technical proposal to the full application, and the domestic technology and product development and application have reached more than 20 years. At present, the three-dimensional wound core transformer technology is becoming more and more perfect in terms of theoretical analysis, structural design, winding, core strip cutting, annealing, assembly production process and supporting manufacturing equipment, which can fully meet the current market demand for three-dimensional wound core transformer mass production.
(3) There has also been some progress in green insulating materials
Vegetable insulating oil has been widely used in various transformers of 330kV and below due to its inherent high insulating performance, high ignition point, high flash point, easy natural decomposition, strong water absorption and other excellent properties, and its technical performance fully meets the transformer insulation requirements. , and has formulated corresponding national and industry standards, and there are many companies with an annual production capacity of 2,000 tons of vegetable insulating oil.
Silicone rubber has excellent characteristics such as good hydrophobicity, excellent insulation performance, reusability, high elasticity, and good explosion-proof performance. The energy efficiency index of dry-type transformers based on silicone rubber materials can meet the requirements of the new version of energy efficiency standards, and it is safer. It can effectively improve the ability to withstand harsh operating environments such as humidity and dust. At present, the product has been successfully operated for 2 years and is in good operating condition, which expands another technical space for the application of dry-type transformers in the future.
(4) The construction of digital factories for intelligent manufacturing of transformers is accelerating
Leading domestic transformer manufacturing enterprises take Made in China 2025 as the guiding ideology, and through the application of technologies such as industrial robotics, collaborative manufacturing and virtual manufacturing, have established covering design, processing (processing), assembly, testing, quality control, logistics and services, etc. The digital workshop of the link has built a digital enterprise platform for collaborative manufacturing and collaborative services, realized the transformation of transformer manufacturing to a digital, networked, and intelligent production mode, and improved the core competitiveness of transformers in domestic and foreign markets.
(5) The concept of the whole life cycle runs through the development of the high-efficiency transformer industry
According to the whole life cycle management, high-efficiency transformers from green design, environmental protection performance of raw material selection, use of harmful substances, conformity of manufacturing process and green factory evaluation principles and judgment requirements, unit energy consumption index of production and manufacturing process, in the whole life cycle Research and improvement of indicators such as the level of energy saving, and the recyclable rate at the end of life, and provide green products.
02High-end material capacity and equipment supply capacity
(1) Production capacity of domestic high-end core materials
The development goals established by the new version of the energy efficiency improvement plan have high requirements on the performance of the core material of the transformer. Analysis of the overall development goals of the energy efficiency improvement plan in 2021-2023:
It needs to be clear here that the 10% increase in the proportion of on-grid operation mentioned in the development goals refers to the proportion of the total capacity of high-efficiency and energy-saving transformers operating on the grid, and of this 10%, more than 85% are Class 2 Energy efficiency; and the proportion of newly added high-efficiency energy-saving transformers in the current year reaches more than 75% quot; refers to the proportion of the number of transformers purchased by each user in that year, which is also dominated by level 2 energy efficiency (above 85%). Therefore, domestic power supply The production capacity of grain-oriented silicon steel and amorphous alloy strip can fully meet the development goals determined by the new version of energy efficiency.
(2) The production and sales volume of the transformer industry is sufficient to support the goal of energy efficiency improvement
In recent years, the output of transformers in China has fluctuated greatly. In 2018, the output of transformers nationwide has rebounded to about 1.76 billion kVA, an increase of 10.67% over 2017. With the successive start of UHV projects and the continuous advancement of distribution network renovation projects, the market demand for transformers is gradually picking up. It is expected that the average growth rate of transformer output will continue to maintain a growth trend of 7%-10%.
03Development level of high-efficiency transformer energy saving and control technology
(1) Compared with the traditional centralized switching compensation technology, the refined reactive power compensation technology has the advantages of high compensation accuracy, high compensation flexibility, and strong pertinence, which greatly improves the power quality and power supply efficiency. In the distribution station area and JP cabinet of the electric transformer.
(2) The wide-width arc-free voltage regulation technology can be applied to both oil-immersed transformers and dry-type transformers. Through its automatic adjustment function, it can realize the output of power supply voltage, expand the voltage constraints of the power grid after the new energy is connected, and reduce the energy of the equipment. Consumption and improve the service life of equipment, to achieve the effect of system energy saving
(3) The intelligent tap-changer technology can realize the comprehensive perception and state maintenance of the on-load tap-changer in the Internet of Things environment, comprehensively improve the reliability of the transformer, greatly improve the matching between the operating gear and the load of the transformer, and reduce the operation speed. wear and tear, and increase the operating life of the equipment.
