The transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. The main components are the primary coil, the secondary coil and the iron core (magnetic core). The main functions are: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer), etc.
Transformers can be divided into distribution transformers, power transformers, fully sealed transformers, combined transformers, dry-type transformers, oil-immersed transformers, single-phase transformers, electric furnace transformers, rectifier transformers, reactors, anti-interference transformers, lightning protection Transformers, box-type substation test transformers, corner transformers, high current transformers, excitation transformers, etc.
Among them, dry-type transformer refers to a transformer in which the iron core and windings are not immersed in insulating oil. The structure is the same as that of an ordinary transformer, and it is mainly composed of iron core and windings. It realizes cooling through air convection, and has the characteristics of flame retardant, flame retardant, fireproof, explosion-proof, and environmental protection. It is safe and reliable to use, easy to install and maintain, and can go deep into the load center.
From the comprehensive technical and economic performance comparison of low noise, energy saving, fire protection, saving soil construction cost, operation and maintenance management cost, and 30-year life span, dry-type transformers have shown their obvious advantages, so they are widely used in high-rise buildings, subways, and subways. Stations, airports, hospitals, petrochemical companies, and mine interiors.
In recent years, the rapid development of the new energy power generation industry has brought better development space for transformers, and has also become an important direction for transformer manufacturers to seize market segments and expand their business scope.
Data shows that the output of dry-type transformers in my country in 2019 is about 273 million kVA, and the compound annual growth rate of output from 2015 to 2019 is about 5.50%. It is expected that the output of dry-type transformers in my country will reach 302 million kVA in 2021.
In recent years, the downstream industry demand of my country's dry-type transformer industry has continued to grow, so it is showing a steady growth trend. State Grid Co., Ltd. and China Southern Power Grid Co., Ltd. are vigorously promoting the construction of smart grids, which requires the development of intelligent dry-type transformers. By combining modern electronic technology, communication technology, computer and network technology with power equipment, And organically integrate the monitoring, protection, control, measurement and management of the power grid under normal and accident conditions, so as to achieve the purposes of data transmission, remote monitoring, and equipment predictive maintenance.