The installation environment for oil-immersed transformers must be carefully selected due to their specific operational requirements. Why is this the case? Oil-immersed transformers generate heat during operation, primarily due to I²R losses (where I = current and R = resistance), which occur as current flows through the windings. This heat can degrade the materials and insulation within the transformer, reducing efficiency and shortening its lifespan.

The heat in oil-immersed transformers is primarily managed by the insulating oil, which circulates to dissipate heat from the core and windings while also protecting internal components. This is why such transformers are commonly used in high-voltage applications, such as power transmission. However, proper sizing, placement, and the use of cooling fans or ventilation are crucial. In confined spaces or indoor installations, inadequate ventilation can lead to overheating, and oil leaks may pose fire risks or environmental hazards. Therefore, oil-immersed transformers have distinct characteristics and cannot be installed arbitrarily—their location must be chosen with care.

For indoor applications, enhanced safety measures are essential to mitigate these risks. Oil-immersed transformers are often designed with larger internal clearances to improve heat dissipation. Fire prevention, ventilation to filter contaminants or toxic gases, and proper oil insulation and cooling maintenance are necessary. When installed correctly, these transformers can be placed close to electrical loads, minimizing secondary line losses. They also generally require less maintenance, as there is no need for frequent oil replacement, and they avoid contamination issues that could compromise insulation and cooling performance.