History and development of dry-type transformers:
The world's first transformer was born in 1876. It had a very simple structure and was air-insulated. In 1885, Hungary successfully manufactured an air-insulated transformer with a closed magnetic circuit in the modern sense. The development and application of transformers entered a period of rapid development. The development of the transformer industry is moving towards higher voltage and larger capacity.
In 1912, the oil-immersed transformer was born. It better solved the insulation problem of high voltage transformers and the heat dissipation problem of large capacity. It quickly became a mainstream product in the field of transformers and has been widely used to this day. Transformer oil, the insulation medium of traditional oil-immersed transformers, is the key to solving the insulation and heat dissipation problems of transformers. However, it also has inherent shortcomings: it is easy to burn or even explode, requires regular inspection and replacement, and the transformer may pollute the environment.
With the development of urban construction and people's increasing safety requirements, oil-immersed transformers are no longer suitable for high-demand applications, and epoxy resin insulated dry-type transformers have emerged.
In 1965, the German T.U Company produced the first epoxy resin insulated dry-type transformer, which used aluminum conductor coils and the outer layer was insulated with epoxy resin, which solved the problem of low insulation strength of air-insulated dry-type transformers.
Epoxy resin is a non-combustible solid insulating material. Such dry-type transformers have the advantages of high insulation strength, no combustion or explosion, no need for maintenance and repair, and environmental protection. They have been widely used around the world, especially in Europe.
In just thirty years, epoxy resin insulated dry-type transformers have continued to advance in technology, process and materials, and have become a very important branch of the transformer family. Most of today's epoxy resin insulated dry-type transformers use copper conductor coils and are vacuum cast with resin with an insulation grade of F or H.
New progress has been continuously made in reducing losses, reducing noise, improving reliability, and increasing single unit capacity. Today, the application of epoxy resin insulated dry-type transformers has been quite extensive and common in various places such as urban construction, transportation, energy, chemical industry, etc. Due to the requirements of different use technologies, epoxy resin insulated dry-type transformers have developed matching Electric transformers, power transformers, isolation transformers, rectifier transformers, electric furnace transformers, excitation transformers, traction rectifier transformers and other types.
My country has introduced epoxy resin insulated dry-type transformer production technology in the 1970s, but the technology development and application were very slow. By the late 1980s and early 1990s, with the introduction of new dry-type transformer production technology and the rapid development of the national economy With the development and the substantial improvement of people's living standards, the application of dry-type transformers has rapidly become popular. The development of domestic dry-type transformer technology has also moved from digestion and absorption to self-development and reached the international advanced level.
So far, the production scale of domestic dry-type transformers has ranked first in the world, and the product technology level and development capabilities of many manufacturers have entered the international advanced ranks.
"Safer, cleaner, more efficient" has become part of our life requirements. The emergence and application of epoxy resin insulated dry-type transformers reflects this requirement of people, and the development of dry-type transformers is also adapted to this requirement. of continuous improvement.
