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Transformer is an important equipment widely used in the power system, which is used to turn the high voltage into low voltage or vice versa for the use of power grid or users. According to the transformer insulation medium is different, can be divided into dry-type transformer and oil-immersed transformer. Transformers are of two types. Next, will analyze the difference between dry-type transformers and oil-immersed transformers from the application areas, structural forms, maintenance and other aspects.
First, the field of application
1.1 Dry-type transformer
Dry-type transformer is widely used in urban and rural power supply, mines, factories, airports, railway stations and other places in the power distribution and lighting and other power systems. It has the characteristics of fireproof, explosion-proof, maintenance-free, long service life, etc. It is suitable for indoor and outdoor installation, which can greatly improve the reliability and safety of the system.
1.2 Oil-immersed transformer
Oil-immersed transformers are widely used in power systems and can be used in substations, power plants, subways and other places. Oil-immersed transformer adopts insulating oil as insulating medium, which has good insulation and heat dissipation performance and can withstand large loads. At the same time, oil-immersed transformer has the characteristics of high temperature resistance, humidity, arc resistance, good insulation, etc., which can meet the needs of high-voltage, large-capacity power equipment.
Second, the structure of the form
2.1 Dry-type transformer
The structure of dry-type transformer is simple, consisting of low-voltage coil, high-voltage coil and iron core, and the coils are isolated from each other by insulating materials and wound on the iron core. Its windings can be wound in different ways, such as cylindrical, rectangular, closed, etc., can be selected according to the different use of the environment and design requirements of different structural forms.
2.2 Oil-immersed transformer
Oil-immersed transformer adopts insulating oil as the insulating material of winding, and its internal structure includes high-voltage coil, low-voltage coil, oil tank, iron core and other components, which are assembled together by locators, supporting components, heat sinks and other components. Meanwhile, the windings and core of oil-immersed transformer are immersed in insulating oil, which better protects the insulating material and improves the reliability and safety of the transformer.
Three, maintenance
3.1 Dry-type transformer
Dry-type transformer has no maintenance, long service life and other advantages, but because of the heat generated by its windings, easy to enter the aging state in a high temperature environment, thus affecting the service life and electrical performance of the transformer. In addition, in the process of use need to pay attention to rain, moisture and other issues to the safe operation of the equipment.
3.2 Oil-immersed transformer
Oil-immersed transformers need regular inspection and maintenance, such as gas detection, oil level detection, oil detection, etc.. When the oil level in the tank exceeds the prescribed range, transformer oil needs to be refilled. At the same time, it is also necessary to check whether the nature of the transformer oil meets the requirements, such as whether deterioration occurs, whether it contains impurities and other issues. In addition to regular maintenance, but also need to strictly comply with the provisions of the operating methods and use of the environment in the use of the process, to prevent the occurrence of improper operation, improper use and other issues!
In summary, dry-type transformers and oil-immersed transformers in the field of application, structural form, maintenance and other aspects of the differences, the user should be combined with the use of the environment, power requirements and other factors for comprehensive consideration when choosing.
