What is the purpose of oil in a 4000 kVA transformer?

The purpose of oil in a 4000 kVA transformer is to provide insulation and cooling. Transformer oil acts as an insulating medium, preventing electrical discharges between conductive parts. Additionally, it dissipates heat generated during operation, maintaining optimal temperature levels. This dual function of insulation and cooling is crucial for the reliable and efficient operation of a 4000 kVA transformer, ensuring longevity and performance stability.