Dry - type transformers are used in community high - voltage distribution rooms

Dry - type transformers are often adopted in community high - voltage distribution rooms. The following is some introduction about them:

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### Structural Features
- **Core**: Generally, high - quality cold - rolled oriented silicon steel sheets are used, which are characterized by low loss and high magnetic permeability. The lamination method of the core is usually full - inclined and non - punched lamination. This can reduce the no - load loss and noise of the core, and at the same time improve the mechanical strength of the core.
- **Windings**: Copper or aluminum is usually used as the conductor material. The insulating materials of the windings are generally Nomex paper, glass fiber, etc. with F - class or H - class insulation, which have good electrical insulation performance and heat - resistant performance. There are various winding methods, such as cylindrical type, helical type, disc type, etc. Different winding methods are suitable for different voltage levels and capacity requirements.
- **Insulation System**: The insulation of dry - type transformers mainly relies on solid insulating materials, such as the insulating paper and glass fiber mentioned above. In addition, some insulating impregnating paints or resins are used to impregnate the windings to improve the overall insulation performance and mechanical strength of the windings. At the same time, reasonable insulation distances and insulating barriers are set between the windings and the core, and between the windings to ensure the reliability of electrical insulation.

### Working Principle
Dry - type transformers work based on the principle of electromagnetic induction. When the primary winding is connected to an AC power supply, an alternating magnetic flux is generated in the core. According to the law of electromagnetic induction, a corresponding electromotive force is induced in the secondary winding. If the secondary winding is connected to a load, current will pass through, thus realizing the transfer and transformation of electrical energy. Its turns ratio is equal to the ratio of the number of turns of the primary winding to that of the secondary winding. By reasonably designing the number of turns of the windings, a high - voltage power supply can be transformed into a low - voltage power supply suitable for community use. For example, a high - voltage of 10 kV or 35 kV can be transformed into a low - voltage of 0.4 kV.

### Application Advantages
- **High Safety**: Dry - type transformers use solid insulating materials and have no potential safety hazards such as oil leakage, combustion, or even explosion that may occur in oil - immersed transformers. They are especially suitable for the densely populated community environment and can effectively protect the lives and property of residents.
- **Simple Maintenance**: Compared with oil - immersed transformers, dry - type transformers do not require regular maintenance work such as oil quality testing, insulation oil replenishment or replacement, reducing the maintenance workload and cost. At the same time, their structure is relatively simple, with fewer components, a lower failure probability, and more convenient maintenance.
- **Good Environmental Performance**: Dry - type transformers do not cause oil pollution during operation and are environmentally friendly. Moreover, the insulating materials and other components they use usually have a low noise level and will not cause noise pollution to the living environment of community residents.
- **Small Space Occupancy**: Dry - type transformers have a compact structure and a relatively small volume. They can save a large amount of installation space in community high - voltage distribution rooms, facilitating the layout and design of the distribution rooms.
- **Strong Fire - resistance Performance**: Since non - flammable insulating oil is not used, dry - type transformers have good fire - resistance performance, can effectively reduce the fire risk, and meet the electrical equipment installation specifications for places with high fire - prevention requirements such as communities.

### Application Scenarios
- **Power Supply for Residential Communities**: Provide stable power supply for residential buildings, supporting commercial facilities, etc. in the community, and convert high - voltage electrical energy into low - voltage electrical energy of 220V or 380V suitable for residents.
- **Power Supply for Community Public Facilities**: Such as power supply for public facilities in the community, including street lights, elevators, fire - fighting equipment, water supply and drainage systems, etc., to ensure the normal operation of these facilities.
- **Power Supply for Small Commercial and Office Premises**: Supply power to small shops, office buildings and other commercial and office premises in the community to meet their daily electricity needs.

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