Transformer FAQ
Dry-type vs oil-immersed transformer: how should a project choose?
The selection depends on installation location, fire and environmental requirements, voltage and capacity, maintenance conditions and lifecycle cost.
Direct answer
Dry-type transformers are commonly selected for indoor or fire-sensitive locations where leakage prevention and simplified maintenance are important. Liquid-immersed transformers are widely used for outdoor, higher-voltage and higher-capacity duties because the insulating liquid provides effective insulation and heat transfer. The final decision should be based on the complete project specification rather than product type alone.
When dry-type is commonly selected
Indoor distribution rooms, commercial buildings, data centers and other locations with strict fire or leakage controls often use dry-type construction. Enclosure, ventilation, ambient temperature and harmonic load must still be reviewed.
When liquid-immersed is commonly selected
Outdoor substations, utility networks, renewable-energy plants and high-capacity industrial projects often use liquid-immersed transformers. Fire protection, oil containment, fluid type and maintenance access must be considered.
What should be compared
Compare voltage and capacity range, fire classification, environmental impact, losses, noise, footprint, maintenance plan, overload duty and total lifecycle cost.
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The final transformer design is confirmed against the complete load, site and standard requirements.