Full analysis of oil immersed transformers technology: structural principles, core advantages, and global application trends

1.Why oil immersed transformers are still the mainstream of the global power grid

Against the backdrop of rapid development of new energy and continuous expansion of the global power grid, transformer tenggelam minyak still dominate the medium and high voltage power systems.
Whether on the power generation side, transmission side, or industrial distribution field, oil immersed transformers remain the preferred solution in the global market due to their high reliability, strong overload capacity, and mature technical system.

Especially in regions such as Africa, the Middle East, South America, and Southeast Asia, oil immersed transformers have been widely used by power companies and EPC projects for a long time due to their adaptability to harsh environments and low maintenance costs.

2.What is an transformer tenggelam minyak

Oil immersed transformers refers to a transformer in which the winding and iron core are completely immersed in insulating oil during operation.
Insulating oil simultaneously undertakes three core functions:

• insulation
• heat dissipation
• Fault energy buffer

This is also the fundamental difference between it and dry-type transformers.

3.Core structure and technical principles of oil immersed transformers

3.1 Iron Core System

Cold rolled oriented silicon steel sheet
Ladder laminated structure
Reduce no-load losses and noise

👉 High end products have widely adopted low loss silicon steel and laser marking technology.

3.2 Winding System

bahan: Copper winding/Aluminum winding
Form: cylindrical, continuous, spiral

Key indicators:

• kekuatan mekanikal
• kestabilan haba
• Anti short circuit capability

3.3 Insulation oil system

Common oils include:

• mineral oil
• natural ester oil
• Synthetic ester oil

Antaranya, environmentally friendly ester oils are becoming a new hotspot in the international market, especially in European projects.

4.Cooling method and model classification

5.Key performance advantages of oil immersed transformers

Superior heat dissipation performance
Strong overload capacity
Long operating lifespan (habis 30 tahun)
Suitable for high voltage and large capacity
Mature maintenance experience and global applicability

6.Oil immersed vs. transformer jenis kering (comparison from an engineering perspective)

7.International Market Trends and Export Focus

The current focus of overseas customers’ attention includes:

• Pematuhan IEC 60076
• Energy Efficiency Level (Low Loss Design)
• anti-corrosion coating
• Adaptability to high temperature, kelembapan yang tinggi, and high altitude

Despite the continuous evolution of new energy technologies, oil immersed transformers remain an irreplaceable basic equipment in the global power system.
Its technological roadmap is mature, with a wide range of application scenarios, and it will continue to maintain stable growth for a considerable period of time in the future.