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Views: 0 Author: Site Editor Publish Time: 2025-08-14 Origin: Site
1. What Is an Oil-Immersed Transformer?
2. Why Choose 3 Phase Oil-Immersed Transformer?
3. Safety and Maintenance Considerations
4. The SHENGTE's Advantages in 3 Phrase Oil Immersed Distribution Transformer
The oil-immersed distribution transformer is like a "voltage-reducing courier" for the power system. It is specifically responsible for safely "reducing" the electricity (such as 10,000 volts) sent from distant high-voltage lines to electricity that can be directly used in people's homes and factories (such as 380/220 volts). Its biggest feature is that the transformer core (iron core and coil) is completely immersed in insulating oil. This oil can be used as an "insulating coat" to prevent leakage and as a "coolant" to take away the heat generated by work, so it has high power, is particularly durable, and is relatively affordable.
The dry transformers do not use oil, but instead put a thick layer of epoxy resin "plastic armor" on the coil or rely on air for insulation and heat dissipation. Its biggest advantage is that it is not afraid of fire (because there is no oil) and is cleaner and more environmentally friendly (not afraid of oil leakage pollution).
However, oil distribution transformers are usually cheaper and have a wide range of applications. For example, the big green iron boxes hanging on roadside electric poles, in community distribution rooms, factory substations, distribution points in towns and villages, etc. As long as they are outdoors or have special rooms and need high-power, economical step-down and power distribution, they are basically its territory.
Single-phase transformers use one pair of windings. It’s used in lower-load situations, such as rural areas.
Three-phase transformers are made up of three pairs of windings. The windings typically go around a core sectioned into three parts. Three-phase power transformers are used in higher-load areas and can supply three circuits with energy.
Power transformers are designed to handle much higher loads. They can step voltages up or down and transmit a current from one place to another.
Distribution transformers transmit lower voltages from the electrical grid to homes and businesses. They are much smaller than power transformers.
Excellent heat dissipation: When the transformer is working, the internal copper coil and iron core will generate heat. The “secret” of the oil-immersed transformer is that it is filled with transformer oil. This is a special insulating oil that can effectively isolate high voltage electricity and prevent short circuits. After heating, a natural convection cycle is formed, which is equivalent to a built-in cooling pump, which actually dissipates heat efficiently.
Long service life and reliability: Transformer oil provides an excellent sealing and insulation protection environment, making the insulation system inside the oil-immersed transformer degrade very slowly under normal working conditions. As long as it is properly maintained, its service life can usually reach 20 years, 30 years or even longer.
Strong overload and impact bearing capacity: Thanks to its efficient oil circulation and heat dissipation capacity, the oil-immersed transformer can bear a load greater than the rated capacity in a short period of time without being immediately damaged by overheating. In addition, its solid metal oil tank structure provides good mechanical strength and sealing, making it more resistant to the huge electromagnetic force impact generated by external short-circuit current and not easy to deform or damage.
Good environmental adaptability: Its sturdy metal shell (oil tank) and internal insulating oil provide excellent physical protection for the transformer core, and can effectively resist the erosion of external environmental factors such as dust, moisture, salt spray, and invasion of small animals.
High cost-effectiveness: In large capacity and high voltage applications, oil-immersed transformers have better cost advantages than dry transformers.
Fire protection requirements: Transformer oil is a flammable liquid. Therefore, when installed indoors, strict fire protection regulations are required (such as setting up oil barrier facilities and fire extinguishing systems). It is usually not recommended to install it in the core area of crowded places or inside high-rise buildings. Outdoor installation is the mainstream.
Environmental considerations: Leakage of mineral insulating oil may pollute soil and water sources. Now, more and more transformers use more environmentally friendly silicone oil or natural esters (vegetable oil) as insulating media.
Maintenance requirements: It is necessary to regularly check the oil level and oil temperature, and conduct oil sample testing (such as measuring withstand voltage, moisture, and gas content) to monitor the internal status. Compared with dry-type transformers, maintenance work is slightly more.
Heat dissipation performance and structural integrity: The spiral coil adopts a longitudinal oil channel design to ensure its excellent heat dissipation performance, small magnetic leakage and high mechanical strength. And the supporting structure greatly enhances the short-circuit tolerance.
High-Efficiency Core: The equipment uses silicon steel sheets with a thickness of less than 0.35 mm and high magnetic permeability to reduce no-load losses and improve efficiency.
High-quality insulation material: High heat-resistant material can withstand overvoltage and overcurrent, ensuring its durability and reliability.
Superior transformer oil: Transformer oil has low viscosity, good thermal conductivity and insulation properties, reduces aging of insulation materials and extends service life.
Durable Tank Construction: It is made of high-quality cold-rolled steel plate and coated with conformal paint to improve reliability and reduce maintenance costs.
Reliable Seal: High-quality rubber material can slow down aging, isolate external air and prevent oil leakage
The SHENGTE has a professional installation team with rich experience. To improve the overall installation level of the installation team and create a more professional installation team, our team regularly conducts skill training and knowledge learning, enhances the professional quality and service awareness of installers, improves the management and assessment system of the installation team, and serves customers with dedication, and considers customer benefits.
In summary, 3 Phase Oil Immersed Distribution Transformers are the core of modern power systems and are widely used in fields that require efficient, large-capacity power transmission and distribution, especially in power companies, heavy industries, large infrastructure and renewable energy projects. When selecting a distribution transformer, the transformer's capacity, voltage level, fire protection and environmentally friendly operating environment are key factors that need to be given priority consideration.
So when you are evaluating distribution transformer solutions, choosing SHENGTE means that you can get value throughout the life cycle of the equipment - if the damage is caused by product quality, we will provide the parts that need to be replaced, always ensuring your strong competitiveness. Please contact our experts: juanie@shengtetransformer.com.
