Operation and application scheme I of the hottest

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Dry type transformer (operation) application scheme (I)

Abstract: with the development of society, we have more pressure on the demand for infrastructure such as more shopping areas, subway stations, industrial comprehensive buildings, commercial areas and high-density residential areas with a large number of people. This in turn requires the use of more complex power distribution to improve the safety of people living and working in these areas. This has become particularly important for Asia, the world's most densely populated place

conventional power distribution is provided through oil immersed distribution transformers. For more than 100 years, these transformers have been using cellulose based materials impregnated with mineral oil as the cooling medium. In addition to being an excellent cooling and insulating medium, mineral oil is also very flammable and may burn when encountering flames. Therefore, when residents are located close to this level of transformer, they put forward the requirement of safer power distribution. These growing demands for the safety, efficiency and environmental protection of power supply equipment that can supply energy in the 21st century with the same output and melt quality can be met with reliable technologies that have been verified in the past 40 years. Class H dry-type transformers are increasingly replacing oil immersed transformers and are often used for power distribution. This kind of transformer can work under harsh environmental and climatic conditions. It is a plastic bellows with the same end as the sample. It is fire-resistant, noise free, and can reduce the volume and weight to minimize the use space. Please call to consult. It can be used exclusively in production. This kind of transformer is most suitable for Asia

today's increasing demand for high energy exerts higher pressure on transformers that can work under heavy loads, especially during peak load periods and severe high-temperature environmental conditions. Transformers working in class F or h or even higher thermal conditions, with aramid insulation system of 220 ℃ class C, can enable users to benefit from the inherent overload capacity without having to invest additional costs to increase the service life. Ten years of tight supply and high prices have made the raw materials for making rubber from sugar come out of the bud. The technical and commercial trends in developed countries have reflected these factors. The insulation system of enclosed and open dry-type transformers has been UL certified, which has long been the preferred solution in the North American market. In Europe, there is an increasing interest in using these non cast transformers, which meet the requirements of new standards that are very strict in fire, climate and environment

today, as we have just entered the new century, it has become more urgent to adopt this kind of transformer in developing regions such as South America and Asia. Users in these regions are gradually recognizing these trends as the best solution for their needs, especially in regions with high load growth. Transformers installed for the specified base load may become unusable in just a few years, because the electrical load is increasing at a two digit annual growth rate, unless the insulation system of these transformers allows an increase in load without reducing service life. With the increasing use of lower temperature solutions, the inherent limitations of their capabilities force users to find more reliable solutions with certified insulation systems. Class H encapsulated and open transformers with aramid insulation system are proven future options

due to its superior safety and some other inherent advantages over mineral oil filled transformers, dry-type transformers are increasingly used around the world to distribute electric energy for shopping malls, hospitals, manufacturers, laboratories, airports, universities, residential areas, ships and other applications where the high safety requirements of other personnel or equipment are the main consideration

the main advantages of dry-type transformer are its fire resistance and ability to work in different environments. The increasing demand has produced new regulations and standards for target classification of equipment, such as c57.15.56 and European CENELEC standard hd-464

dry type transformer needs to have low noise level, compact and low weight to minimize the use space, and can be used exclusively for production activities. Users and specifiers in many countries have switched to encapsulated and open dry-type transformers as their required solutions. In Europe, some manufacturers have provided cast resin technology using class B or class F insulation systems. Many parts of Asia, including China and South Korea, have adopted this technology from Europe. However, after ten years of use, the inherent limitations of these transformers are gradually becoming a more concerned problem for users. Increasing overload, requirements for environmental protection materials and long-term reliability have become the shortcomings of these lower temperature solutions. Strict requirements can lead to the cracking of large pieces of resin and accelerate the aging of materials, so it will fail prematurely in less than ten years

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