Dry type transformer has been developed rapidly all over the world. It is only half a century since the middle and late 20th century. With the continuous development of urban and rural power grid modernization, China's power grid load is increasing. In the 1990s, < 0 > was widely used in China. With the construction and transformation of urban and rural power grids, the acceleration of the development of the western region, and the success of Beijing's bid for the 2008 Olympic Games, the Three Gorges water conservancy project of the Yangtze River has begun to generate electricity, which is facing new development opportunities, and its production and sales will have a new leap.
With the rapid development of urban rail transit, dry-type transformers suitable for urban subway and rail transit have been widely used. The voltage levels are usually 10 kV and 35 kV, and the number of rectifier pulses is 12 and 24. The harmonic pollution of the 24 pulse rectifier circuit to the power grid is 50% lower than that of the 12 pulse rectifier circuit, so the filtering device can be omitted. The capacity is 800, 2000, 2500, 3300 and 4400kva (used in Shenzhen Metro). Domestic metro and light rail projects, such as Beijing, Shanghai, Guangzhou, Shenzhen, Nanjing, Wuhan, Dalian, Changchun and so on, all use domestic traction rectifier transformers, and the operation performance of the vehicles is very good. The traction transformer made in China is also used in healthy Teheran Metro project.
Characteristics of traction power supply transformer for Urban Rail Transit
1. The harmonic pollution of the rectifier circuit to the power grid is 50% lower than that of the 12 pulse rectifier circuit.
2. The technology is more difficult. By strictly controlling the design of key structure, the balance, consistency and interchangeability of product output and parameters can be ensured.
3. When two units are running, it is 24 pulse, and a single unit can also run with 12 pulse, which improves the reliability of the system.
4. It can operate reliably under severe load conditions.
5. The output waveform is smooth, the smoothing device can be omitted, the power grid structure can be simplified, the equipment investment, land occupation and installation investment can be saved, the power grid quality and reliability can be improved, and the maintenance cost can be saved.
At present, two 2500kVA / 33kV 24 pulse rectifier transformers have been installed in Guangzhou metro line. The successful development of this product has opened up a new application field of dry-type transformer in China, and made the technology of dry-type transformer step up to a new level, setting a milestone for the development of urban rail transit in China. Being down-to-earth, people-oriented, based on science and technology, and committed to the future, Shunte electric not only provides high-quality products and services, but also focuses on the development and exploration of the future road of urban power grid electrical technology.
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