When we mention oil-immersed transformers, we usually think of their strong overheating and electrical stress protection capabilities, enabling long-term stable operation. For decades, oil-immersed transformers have continuously evolved, winning the trust of users with their superior electrical insulation and cooling performance, helping power projects meet stringent reliability standards.
To produce a high-quality oil-immersed transformer, it is essential to choose a reliable transformer tank manufacturer. Zhihe is a professional source factory specializing in oil tank production. We have been developing in this industry for 15 years, possessing professional production equipment, automated production lines, and skilled production workers.
This article will introduce what Zhihe oil tanks can offer you.
First, let's understand the basic principle of oil-immersed transformers.
Oil-immersed transformers use a different heat dissipation method than dry-type transformers. In an oil-immersed transformer, everything inside the tank is immersed in insulating oil. This oil provides both electrical insulation and assists in overall heat dissipation. When the transformer is running, current flows through it, and the windings and core generate a large amount of heat. This heat is absorbed by the insulating oil, transferred to the tank walls or radiator, and ultimately dissipated into the air.
Oil-immersed transformers offer various cooling designs, including natural convection (ONAN) cooling, external fans, and forced oil circulation for forced cooling. These designs allow oil-immersed transformers to handle a wide range of voltage levels, making them widely used in utility distribution networks and industrial plants.
Therefore, for oil-immersed transformers to operate stably over the long term, a robust tank with excellent sealing performance and corrosion resistance is essential to protect the internal insulating oil from leakage and contamination. Choosing a high-quality tank is crucial, as it is not only a container for transformer oil but also a core component ensuring safe operation, heat dissipation, insulation, mechanical protection, and extended service life. Here are the advantages of Zhihe tanks:
I. Guaranteed Insulation and Heat Dissipation Performance
The insulation and heat dissipation of oil-immersed transformers rely on the insulating oil, and the quality of the tank directly affects the oil's performance. Zhihe tanks: Our welds are tight, and our products have strong sealing performance, effectively preventing oil leakage or moisture absorption, ensuring the oil maintains high insulation strength and good heat dissipation capacity.
Low-quality oil tanks: Defects such as micropores in the welds may lead to oil leakage. Exposure to air causes moisture absorption or oxidation, reducing insulation performance and potentially causing internal short circuits or partial discharges.
✅ Zhihe's oil tanks = Leak-proof oil + Stable insulation + Effective heat dissipation
II. Preventing Insulating Oil Deterioration and Contamination
If the oil tank has poor sealing, the insulating oil will come into contact with air, moisture, or impurities, accelerating aging and oxidation, producing acids and sludge, reducing insulation performance, and causing internal component failures.
Zhihe's oil tanks: Excellent sealing performance, combined with an oil conservator and dehumidifier, effectively isolate air and moisture, delaying oil aging and reducing maintenance costs.
Low-quality oil tanks: Poor sealing allows oil to easily absorb moisture and oxidize, increasing maintenance costs and oil change frequency.
✅ Zhihe's Oil Tanks = Extended Oil Life + Reduced Maintenance
III. Withstanding Mechanical Stress and Short-Circuit Electrodynamic Forces
Oil-immersed transformers experience various mechanical stresses during operation. During sudden short circuits, they generate significant electrodynamic forces between the windings. These forces are transmitted to the oil tank through the insulation components.
Zhihe's Oil Tanks: High tank rigidity and robust welds enable them to withstand the impact of short circuits without deformation or cracking, protecting the internal windings and core.
Low-Quality Oil Tanks: Thin walls and weak welds may deform or tear during short circuits, leading to internal structural displacement or even failure.
✅ Zhihe's Oil Tanks = Strong Short-Circuit Resistance + Reliable Structure
IV. Preventing Partial Discharge
As a grounding component, the oil tank has an electric field distribution relative to the high-voltage windings. If the inner wall of the tank has burrs, sharp corners, or other defects, it can cause localized electric field concentration, inducing partial discharge, which can eventually lead to insulation breakdown.
Zhihe's Oil Tanks: Smooth inner walls, chamfered edges, and no sharp protrusions prevent partial discharge.
Low-quality oil tanks: Rough interiors with sharp corners are prone to partial discharge, accelerating insulation aging.
✅ Zhihe's oil tanks = Suppress partial discharge + Improve insulation reliability
V. Enhanced Corrosion Resistance
Oil-immersed transformers are typically used outdoors, facing harsh environments such as sunlight, rain, humidity, salt spray, and industrial pollution.
Zhihe's oil tanks use high-quality steel (such as Q235B or cold-rolled steel plate) and undergo rigorous surface treatment (sandblasting, epoxy zinc-rich primer + topcoat) to enhance corrosion resistance.
Low-quality oil tanks: Poor material quality and thin coating make them prone to rust and rust penetration, leading to oil leakage and reduced structural strength.
✅ Zhihe's oil tanks = Long lifespan + Resistance to environmental corrosion
