In the power system, dry power transformer, as the key equipment of power transmission and distribution, plays an important role. It not only has the characteristics of simple structure and easy maintenance, but also shows significant advantages in environmental protection, safety and energy saving, and is widely used in many fields such as industrial, commercial and residential electricity.

1. Definition and working principle

Dry power transformers, as the name suggests, are transformers that do not use oil or other liquids as insulation and cooling media. It mainly relies on air or other gases for cooling, and uses solid insulating materials (such as epoxy resin, etc.) to separate the winding from the iron core. The working principle of the dry transformer is based on electromagnetic induction, when the primary winding is connected to the input power, the generated magnetic field will pass through the iron core, and then the magnetic force line will be transferred to the secondary winding, so as to achieve the voltage transformation.

2. Classification and characteristics

According to the different cooling methods, dry power transformers can be divided into two types of natural cooling and forced cooling. The natural cooling type is suitable for occasions with small capacity and light load, while the forced cooling type is suitable for occasions with large capacity and heavy load. The characteristics of dry transformer are mainly reflected in the following aspects:

Environmental protection: do not use oil or other liquid insulating media, avoid the problem of oil leakage and environmental pollution, in line with modern environmental protection requirements.

Safety: The use of solid insulating materials, with high electrical strength and heat resistance, effectively prevent electrical failures and fire accidents.

Energy saving: low no-load loss and load loss, which can effectively reduce energy consumption and operating costs.

Easy maintenance: simple structure, no need to replace the insulation oil regularly, reducing the maintenance workload.

3. Application fields

Dry power transformers have a wide range of applications, including but not limited to:

Industrial field: Provide power supply for machine tools, cranes, transmission devices, etc.

Commercial electricity: used for lighting, air conditioning, elevators and other equipment in shopping malls, supermarkets, office buildings and other places.

Residential electricity: to provide stable power for the power supply system of the residential community.

Special environment: such as high temperature, humid areas and heavily polluted areas, dry transformers are favored for their good weather resistance and anti-pollution ability.

4. Future development trend

With the continuous progress of science and technology and the increasing awareness of environmental protection, dry power transformers will show the following development trends in the future:

High efficiency and energy saving: Through the use of new materials, new processes, new technologies and other means to further reduce no-load loss and load loss, improve energy efficiency.

Intelligent: to achieve intelligent monitoring, diagnosis and management, through the installation of intelligent sensors, data acquisition devices and other equipment, improve the intelligent level of operation and maintenance.

Compact: With the continuous development of urban construction and the increasing tension of land resources, compact design will become an important development direction of dry transformers.

High reliability: By strengthening product quality control, optimizing production process and other means, improve the operation stability and service life of dry transformer.

As an important part of power system, dry power transformer plays an irreplaceable role in power transmission and distribution with its high safety, environmental protection and good performance. In the future, with the continuous innovation of technology and the promotion of environmental protection policies, dry transformers will continue to develop in the direction of efficiency, intelligence, compact and high reliability, and make greater contributions to the sustainable development of the power industry.