Features of Dry Type Transformer
- Environmentally insulating materials significantly improve operating security.
- Low maintenance costs eliminate the need for an oil treatment system.
- High-strength material supports for working in a high-humidity environment.
- Installation flexibility significantly reduces civil engineering costs.
- Oil-free and pollution-free materials and processes meet green building standards.
Leading Dry Type Transformer Manufacturer in China
ZHONGSHAO dry-type transformer’s unique oil-free design gives it enhanced fire safety. ZHONGSHAO dry-type transformers have passed IEC, UL, and CE certifications, and their extremely high reliability is becoming an increasingly popular solution in modern power distribution systems.
Material copper and aluminum, manufactured with premium materials that enhance flame resistance and scratch-resistance.
Great high efficiency and ideal continuous productivity. Has 50 hertz frequency with multi-phase.
Has great power distribution and multi-phase, Manufactured to endure heavy impact and explosion-proof.
Autotransformer and great power application, equipped with high-quality power distribution and dual-winding device.
MMulti-phase and high-voltage capacity. Power transformer with great independent distribution.
Great durability and high efficiency function, has great input voltage and distribution system.
Maintenance-free and productive control, great frequency with low-noise volume and no disturbance.
High-pressure and high efficiency, customization of voltage for the transformer. The coil structure is toroidal.
What is the Dry Type Transformer?
The transformer is a device that transmits energy from one AC circuit to another AC circuit. The dry type transformer is the type of transformer that uses clean, fresh air or forced air for cooling. It is widely used in medium and low voltage electrical equipment in industrial, commercial and utility applications.
Advantages of the Dry Type Transformer
Safety
The dry type transformer is made from environmentally friendly insulation material with smooth winding and self-extinguishing. It has flame-retardant ability, so you do not need to purchase a fire extinguisher. Even under the arc action, the dry type transformer won’t produce toxic gas. There is no oil or any other liquid in the dry type transformer; you don’t need to worry about oil leakage or other environmental pollution issues.
No Fire Hazard
The dry type transformer uses clean natural or forced air for cooling. It is suitable for the indoor area or a place that needs to avoid fire hazards. If you are purchasing the dry type transformer for the office, college, hospital or any other manufacturing cleanrooms, then the dry type transformer is your best choice.
In addition, if you want to install the dry type transformer in the outdoor area, you can equip an enclosure with NEMA 3 protection degree. The extra protection can be used in the outdoor installation environment with moderate temperature and humidity throughout the year.
Low Noise
Both the noise of coils and the core are low. The copper coils are solidified and moulded as a whole without an air gap between windings. The copper coils also have high strength and high damping. This means the dry coils are less prone to vibration under the influence of electromagnetic forces. The cores are made from high-permeability cold-rolled silicon steel sheets with a step-lap laminated core process. This can help to reduce the noise produced in the excitation process.
In addition, the dry type transformer uses a complete machine painting process to ensure the noise and vibration to the lowest level. You can also equip your dry type transformer with an acoustic enclosure if you have a special requirement, such as a data centre or office.
High Reliability
The coil of the dry type transformer is epoxy-encapsulated, which has a strong strength. The strong strength can resist the short-circuit. At the same time, the dry type transformer is moisture-resistant and resistant to salt spray corrosion, which means it can be used in the high-humidity environment with a maximum of 95% humidity.
Environmental Protection
The structural materials of the dry type transformer are copper/aluminium coil, silicon steel sheet, and steel casing. Among them, metal raw materials such as copper, aluminium, and steel can be 100% recycled and reused.
In addition, the dry type transformer uses a solid insulation system such as epoxy resin, glass fibre, or Nomex. There is no oil pollution risk without emitting any harmful gases. The dry type transformer won’t exacerbate the greenhouse effect and is suitable for your colour architecture and environmental projects.
Installation Flexibility
Compared with the oil immersed transformer, the dry type transformer does not need the insulating oil. So you don’t need to use the oil containment pit, fire barrier wall, oil drainage trench and oil leakage mirror system when installing the dry type transformer. This can help you significantly reduce the quantity of civil engineering works. You can easily install the dry type transformer close to the load centre inside the building.
The volume of the dry type transformer is more compact and compact footprint, so you can easily install the transformer depending on your project needs. Also, the weight of the dry type transformer is lighter than the oil immersed transformer by about 15-25%, so you can easily move the dry type transformer anywhere you want.
Long Service Life
The long service life is an important advantage of the dry type transformer. The life span of the oil immersed transformer transformer mainly depends on the oil degradation, while you don’t need to worry about the situation occurring in the dry type transformer. The dry type transformer uses a solid insulating system with high-quality insulating material, which is more age-resistant.
The dry type transformer uses the high thermal conductivity resin with optimised duct design to achieve high-temperature insulation. A series of special designs can reduce the temperature of the coil and core by about 6-8℃ to keep within the safety margin. The dry type transformer can withstand high temperatures without degrading. Also, the thermal effect and dielectric effect are low to get a long service life.
Low Maintenance Cost
Compared with oil immersed transformer, the dry type transformer does not need an oil treatment system, oil circulation and heat dissipation system, oil pump, cooler and solenoid valve. The fault points of the dry type transformer are fewer, which means you do not need to spend to much on the maintenance costs.
Besides, the maintenance of the dry type transformer is easy. The coil has dust protection and is moisture-proof. You don’t need to regularly open the cover for maintenance. You just need to do the simple duct dust removal operation and electrical inspection, such as infrared temperature measurement. The annual maintenance cost of the dry type transformer is about 20–30% of the oil immersed transformer.
Applications of the Dry Type Transformer
Chemical, Oil & Gas Industries
The dry type transformer plays an important role in the chemical, oil and gas industries. These industries have some common points. First, these places are moist and even corrosive. At the same time, there are many dangerous, flammable and explosive substances. In continuous production environments, high demands are placed on the reliability of transformers.
- Petrochemical plant
- Offshore platform
- Refinery
Environmentally Sensitive Areas
The environmentally sensitive areas have strict environmental protection needs for the transformer. Any oil leakage or overflow will pollute the water source, soil or wildlife habitat.
- Froest
- Wetland
- Water source protection area
Fire Risk Area
Places where people gather are often prone to fires. Therefore, the safety of transformers is paramount if they are to be used in such locations. The dry type transformer can prevent fire hazards or reduce fire damage to the greatest extent possible.
- Shopping Mall
- Hospital
- School
How to Choose the Transformer?
You may be wondering how to choose the transformer between the dry type transformer and the oil immersed transformer. The following are the most important 3 factors you need to consider.
Application
First, the most important factor is the specific application you need. Choose the transformer based on the voltage of your equipment. Usually, the dry type transformer is more suitable for medium and low voltage applications, while the oil immersed transformer is suitable for high voltage applications.
Installation location
Is the installation location is indoor or outdoor environment? This is also the important factor. Different regions have different requirements for transformer safety. If you want to use it in indoor places such as shopping centres or office buildings, then the dry type transformer is your best choice.
Efficiency
In terms of operating efficiency, dry-type transformers are more stable than oil-type transformers. Oil-type transformers are more suitable for operating conditions that require high short-circuit resistance and frequent overload.
No. There is no oil in the dry type transformer, but cooled by natural air. All the parts are solid state without a flash point. In addition, the total structure of the dry type transformer is a fully enclosed, solid-state system, the main reason for the fire and spills have removed.
Yes. The dry type transformer uses high-performance silicon steel sheets and an advanced casting process. So the no-load losses and short-circuit losses of the dry type transformer can meet or exceed the energy efficiency standards.
No. Compared with oil immersed transformer, the pollution and dust have a relatively small impact on dry type transformer. If you need to use the dry type transformer in dusty or mildly corrosive environments, you can equip the enclosures with protective degrees like IP23 or IP44 for stable operation.
