Fully enclosed three-phase coherent transformer vs. Oil-immersed type: Why do tropical region projects choose it with 20% more budget?

In power projects in tropical regions, fully enclosed dry-type power transformer are becoming the choice of most customers with a procurement cost 20% higher than that of oil-immersed ones. Its core value lies in the protective system designed for extreme environments such as hot and humid conditions and salt spray, providing more reliable power supply guarantees for regions like Southeast Asia and the Middle East.
The core difference of a transformer lies in its moisture-proof and salt spray resistance performance. Our company has introduced advanced technology to develop the SC9, ScB9 series and SC10, SCB10 series of filled thin-insulated dry-type distribution transformers. The windings of these dry-type transformers are sealed with epoxy resin, featuring flame retardancy, explosion-proof, maintenance-free, pollution-free, compact structure and the ability to be deeply integrated into the load center. With IP65-level protection, it significantly blocks the salt spray penetration during the monsoon season, reducing corrosion failures by 85% compared to oil-immersed equipment. It features a scientific and reasonable design and coating process, with small partial discharge capacity, low noise, good heat dissipation, and the advantage of being able to operate for a long time at 40% of the rated load in a cold air environment.
For purchasers in tropical regions, it is recommended to give priority to maintenance-free models with H-class insulation and VPI vacuum pressure impregnation process, which is a better choice. Although the initial cost increases by 20%, the maintenance cost throughout the entire life cycle can be reduced by more than 40%, and there is no need for oil stain treatment, which is more in line with environmental protection requirements. For instance, the Jurong Island Chemical Industry Zone in Singapore has achieved unmanned operation of substations by purchasing such equipment in bulk, saving over 300,000 US dollars in annual operation and maintenance expenses.
In view of the hot and humid climate characteristics of tropical regions, this type of transformer does not require oil cooling (dry type) and has two major advantages: first, it basically requires no manual maintenance; second, the casing is particularly rust-proof and corrosion-resistant. These improvements not only extend the service life of the equipment, but also reduce maintenance costs, enabling the investment in power construction in tropical regions to achieve better long-term returns.