The development direction of dry-type transformers in recent years
Dec 13,2024
The annual output of dry-type transformers has reached 10,000MVA, making China one of the countries with the largest dry-type transformer production and sales in the world. With the promotion and application of the low-noise (noise of distribution transformers below 2500kVA has been controlled within 50dB) and energy-saving (no-load loss reduced by 25%) SC(B)9 series, the performance indicators and manufacturing technology of my country's dry-type transformers have reached the international advanced level. With the promotion and application of dry-type transformers, its production and manufacturing technology has also made great progress. It can be predicted that the future dry-type transformers will make further progress in the following aspects.
(1) Energy saving and low noise: With the introduction of new low-loss silicon steel sheets, foil winding structure, stepped core joints, environmental protection requirements, in-depth noise research, and computer optimization design and other new materials, new processes, and new technologies, the future dry-type transformers will be more energy-saving and quieter.
(2) High reliability: Improving product quality and reliability will be people's unremitting pursuit.
(3) Environmental performance certification: Based on the European standard HD464, the research and certification of the weather resistance (C0, C1, C2), environmental resistance (E0, E1, E2) and fire resistance (F0, F1, F2) characteristics of dry-type transformers are carried out.
(4) Large capacity: From 50~2500kVA distribution transformers to 10000~20000kVA/35kV power transformers, as the urban power load continues to increase, urban grid regional substations are increasingly penetrating into urban central areas, residential areas, large factories and mines and other load centers, 35kV large-capacity community central power supply transformers will be widely used.
(5) Multifunctional combination: From a single transformer to a multifunctional combined transformer with air cooling, protective housing, temperature computer interface, zero-sequence transformer, power metering, closed busbar and side outlet.
(6) Development in multiple fields: from distribution transformers to power plant transformers, excitation transformers, subway traction rectifier transformers, high current electric furnace transformers, nuclear power plants, special transformers for ships and oil platforms, and multi-purpose fields. Among them, dry-type traction transformers used in urban subways and rail transit have three voltage levels of 10, 20 and 35 kV, and capacities of 800, 2500 and 3300 kVA. In order to reduce harmonic pollution, they have been developed from 12-pulse rectification to 24-pulse rectification; the excitation transformer of the world-renowned Yangtze River Three Gorges International's largest 840,000 kW generator has been successfully developed by Shunte Factory and passed the national acceptance. It can be predicted that the distribution transformers in the 21st century will be resin-insulated dry-type transformers with superior performance, low noise and energy saving.
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