What are the advantages and disadvantages to using a Fan-Cooled Transformer?

Advantages:

• Smaller size; fans may add some height but may reduce width and depth
• Lower costs for larger units (generally above 1000kVA) to add fans instead of conductor and core
• Potentially better low-load efficiencies

Disadvantages:

• Increased complexity and maintenance
• Increased cost as fan packages may cost more than just adding material in smaller units
• Additional energy losses and noise when fan motors are operated in higher loads