Dry Resin-Cast Transformer Advantages
06-10 2025 | By:
Dry Resin – Cast Transformer
1. Overview of Dry Resin – Cast Transformer
The dry resin – cast transformer is a type of power transformer widely used in modern power systems. Different from traditional oil – immersed transformers, it uses resin as the main insulating material, which is vacuum – cast around the windings. This unique manufacturing process endows it with excellent electrical insulation performance, mechanical strength, and fire – resistance characteristics.
Dry Resin-Cast Transformer Advantages
2. Specification of Dry Resin – Cast Transformer
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Parameter
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Details
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Rated Voltage
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Usually available in a wide range such as 3kV, 6kV, 10kV, 35kV, etc., to meet different voltage – level requirements in power distribution systems.
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Rated Capacity
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Ranging from a few kVA to several MVA, for example, 50kVA, 100kVA, 200kVA, 500kVA, 1000kVA, 2000kVA, etc., suitable for various load capacities in different application scenarios.
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Rated Frequency
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Commonly 50Hz or 60Hz, adapting to the frequency standards of different power grids around the world.
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Insulation Level
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Generally reaches F – class (155°C) or H – class (180°C), indicating high – temperature resistance and long – term reliable operation capabilities.
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Impedance Voltage
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Expressed as a percentage, values like 4%, 4.5%, 6%, etc., which affects the short – circuit current and voltage regulation performance of the transformer.
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Cooling Method
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Primarily natural air cooling (AN) for normal operation, and can also be equipped with forced air cooling (AF) systems. When using forced air cooling, the output capacity can be increased by about 50%, which is beneficial for handling short – term overloads.
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Degree of Protection
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Can be equipped with different protection levels of enclosures. For example, IP20 can prevent the entry of solid objects with a diameter greater than 12mm, protecting against accidental impacts; IP23 not only has the functions of IP20 but also can prevent water droplets from flowing in at an angle within 60° from the vertical line, making it suitable for outdoor installation.
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3. Application Scenarios
3.1 High – Rise Buildings
In high – rise buildings, space is limited, and safety requirements are extremely high. Dry resin – cast transformers, with their small size, light weight, and excellent fire – resistance performance (resin materials are generally non – flammable or flame – retardant), can be installed in equipment rooms on each floor or in the basement, close to the load center. This reduces the loss of power transmission and distribution and improves the reliability of power supply. For example, in a 50 – story commercial building, dry resin – cast transformers can be used to supply power to office areas, lighting systems, and elevator systems on each floor.
Dry Resin-Cast Transformer Advantages
3.2 Commercial Centers
Commercial centers often have complex electrical equipment and large – scale lighting systems, resulting in high – density power consumption. Dry resin – cast transformers can stably meet the power demand of these areas. Their low – noise operation also ensures a quiet shopping environment for customers. For instance, in a large – scale shopping mall covering an area of tens of thousands of square meters, dry resin – cast transformers are responsible for power distribution to various shops, restaurants, and entertainment facilities.
3.3 Hospitals
Hospitals require highly reliable power supplies to ensure the normal operation of medical equipment. Dry resin – cast transformers have good electrical performance and stability, which can provide clean and stable power. In addition, their fire – resistance and explosion – proof properties are crucial in a hospital environment. For example, in the intensive care unit (ICU) of a hospital, where life – support equipment is used, dry resin – cast transformers can ensure continuous and stable power supply, reducing the risk of power – related medical accidents.
3.4 Underground Rail Transit
Underground rail transit systems, such as subways, are in a relatively closed and humid environment. Dry resin – cast transformers have good moisture – resistance, and their compact structure is suitable for the limited space in subway stations and vehicle depots. They are used to supply power to train traction systems, station lighting, ventilation systems, and other equipment. For example, in a subway station, dry resin – cast transformers are installed in the substation to convert high – voltage power from the grid to a suitable voltage level for various electrical equipment in the station and trains.
3.5 Industrial Factories
Industrial factories often have large – capacity electrical equipment with high – voltage and high – current requirements. Dry resin – cast transformers can meet these demands with their high – capacity and high – voltage – resistance capabilities. They can be used in factories in various industries, such as steel mills, chemical plants, and electronics factories. For example, in a steel mill, dry resin – cast transformers are used to supply power to large – scale smelting equipment, ensuring the stable operation of the production line.
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4. Advantages of Dry Resin – Cast Transformer
4.1 High Safety Performance
- Fire – Resistance: The resin used in dry resin – cast transformers is generally flame – retardant or non – flammable. In case of a short – circuit or overheating, it can effectively prevent the spread of fire, reducing the risk of fire accidents in power – using environments.
- No Oil Leakage: Different from oil – immersed transformers, dry resin – cast transformers do not use insulating oil. This eliminates the potential hazards of oil leakage, such as environmental pollution and the risk of explosion caused by oil leakage and ignition.
4.2 Excellent Electrical Performance
- Low Partial Discharge: The vacuum – casting process of resin ensures that the windings are tightly wrapped, reducing air gaps and impurities. As a result, the partial discharge value is extremely low, which helps to improve the insulation performance and service life of the transformer.
- Good Voltage Regulation: With advanced design and manufacturing technology, dry resin – cast transformers can maintain stable output voltage under different load conditions, ensuring the normal operation of electrical equipment connected to the power grid.
4.3 High Mechanical Strength
The resin – cast structure forms a solid and integral body with the windings, endowing the transformer with high mechanical strength. It can withstand external impacts and vibrations during transportation and installation, as well as the mechanical stress generated by short – circuit currents, improving the reliability of the transformer in operation.
4.4 Energy – Saving and Environmental Protection
- Low Loss: Advanced materials and design techniques are used in dry resin – cast transformers to reduce iron loss and copper loss. Compared with some traditional transformers, they have lower energy consumption during operation, which is beneficial for energy conservation.
- No Pollution: Since there is no insulating oil, there is no risk of oil pollution to the environment. In addition, the resin materials used are generally environmentally friendly, meeting the requirements of modern environmental protection.
4.5 Easy Maintenance
- Simple Structure: The structure of dry resin – cast transformers is relatively simple compared to some complex – structured transformers. There are no complex oil – related systems, making inspection and maintenance easier.
- Long Service Life: With good electrical, mechanical, and thermal performance, dry resin – cast transformers have a long service life under normal operating conditions. This reduces the frequency of replacement and maintenance, saving maintenance costs and time.
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5. Manufacturer: ZTELEC Yuguang Electric Technology (Henan) CO., Ltd.
ZTELEC Yuguang Electric Technology (Henan) CO., Ltd. is a professional manufacturer in the field of electrical equipment.
5.1 Production Capacity and Technology
- Advanced Production Equipment: The company is equipped with a series of advanced production equipment for dry resin – cast transformers, such as high – precision winding machines, vacuum – casting equipment, and automatic curing furnaces. These advanced equipments ensure the high – quality production of transformers.
- Skilled Technical Team: It has a group of experienced engineers and technicians who are proficient in the design, production, and testing of dry resin – cast transformers. They can continuously optimize the production process and product performance based on the latest industry technologies and customer needs.
5.2 Quality Control
- Strict Quality Standards: ZTELEC Yuguang Electric Technology adheres to strict national and international quality standards, such as IEC (International Electrotechnical Commission) standards and relevant Chinese national standards, during the production of dry resin – cast transformers. From the selection of raw materials to each production process and final product testing, strict quality control is implemented to ensure that each product leaving the factory meets high – quality requirements.
- Complete Testing System: The company has a complete set of testing systems, including electrical performance testing, insulation performance testing, and mechanical strength testing. Each transformer undergoes comprehensive testing before leaving the factory to ensure its performance and quality are up to standard.
5.3 Customization Service
- Meeting Diverse Needs: The company can provide customized services for dry resin – cast transformers according to different customer needs. Whether it is special voltage levels, capacities, or other specific requirements, the technical team can design and produce products that meet customer expectations. This customization service enables customers to obtain transformers that are more suitable for their specific application scenarios.
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