The thermal stability of the insulated crepe paper tube in oil-immersed transformer is the main factor affecting the life and overload capacity of the oil-immersed transformer. From the preparation process, physical and chemical properties, electrical performance and anti-aging ability, etc. The research and the application of advanced technology are conducive to the development of more high-quality, high-grade insulating corrugated paper tube materials, which has promoted the development of the entire oil-immersed transformer industry.
Oil-immersed transformers have the characteristics of good heat dissipation, low loss, large capacity, and low cost. They have become the most widely used power transformers in the power grid, and their reliability is directly related to the safety and stability of the power grid. Oil-immersed transformers use a solid-liquid composite insulation structure. At present, conventional oil-paper insulation systems composed of crepe paper tube in oil-immersed transformer and mineral insulating oil are often used. The safety and reliability of the insulation system is the basic condition for the normal operation of the transformer. During the operation of the oil-immersed transformer, the insulation system will gradually deteriorate due to the influence of many factors such as temperature, oxygen, and moisture. Among them, thermal aging is the most The main factor.
The thermal stability of the insulated crepe paper tube in oil-immersed transformer has become the main factor affecting the life, load capacity, capacity and volume of oil-immersed transformers. According to the provisions of GB / Z 1094.14-2011, the heat-resistant ultra-cellulose insulating paper, mineral insulating oil, solid or liquid insulating material of the wrinkled paper tube raw materials are high-temperature insulating materials, and different insulating materials can be combined into different heat-resistant grades. Insulation system, according to different temperature requirements, select different insulation grades of heat-resistant materials, taking into account the heat resistance and economic efficiency of the insulation materials.
A lot of research has been done on high-temperature insulated crepe paper tube in oil-immersed transformer that can be used in oil-immersed transformers. In the field of solid insulation materials, aramid paper and polyamide-based adhesive paper have been used in oil-immersed transformers. Applications in oil-immersed transformers have attracted attention, such as polyester, polycarbonate, etc. Improving the aging resistance and heat resistance of insulated corrugated paper tubes for oil-immersed transformers is still an important part of the development of oil-immersed transformers.