Power Transformers are essential components of electrical power grids.
The useful life of a power transformer is effectively determined by the state of its insulation system. The insulation system deterioration is directly correlated to the temperature at which it is operated.
Maintaining the temperature of power transformers within an optimal range ensures the proper utilisation of its useful life.
The presentation below shows why and how the cooling systems of power transformers work.
I have also talked about some of these concepts in a series of articles published in the Power Transformers Magazine: https://transformers-magazine.com/magazine/633-power-transformer-life/