Dry Type vs Oil Immersed Transformer: Complete Comparison Guide

Choosing between dry type and oil immersed transformers is one of the most common decisions in power distribution planning.

Key Differences

CriteriaDry TypeOil Immersed
Fire SafetyExcellentRequires protection
MaintenanceMaintenance-freeRegular oil testing
Initial Cost20-40% higherLower
InstallationIndoor, no containmentMay require oil pit

Best Applications

Dry Type: Indoor installations, fire-sensitive areas, data centers, roof-top installations.

Oil Immersed: Outdoor substations, industrial plants, rural electrification, large-scale solar farms.

Conclusion

Choose dry type when fire safety and maintenance-free operation are priorities. Choose oil immersed when cost efficiency and outdoor use are needed.

Runsheng Transformer manufactures both types with full IEC 60076 certification.

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