What is the purpose of an oil tank in a transformer?

The purpose of an oil tank in a transformer is to store the insulating oil that plays a critical role in both cooling and insulating the transformer. This oil absorbs heat generated during the operation of the transformer, thus maintaining optimal temperature and ensuring efficient performance. Moreover, the oil acts as an electrical insulator, preventing unwanted current flow and providing a barrier against electrical faults. Additionally, the oil in the oil tank helps in dissipating moisture and other gaseous byproducts that can arise during operation. Overall, the oil power transformer relies on the oil tank to support its operational reliability and safety.