What is the purpose of 25 kV transformer oil in power transformers?

The purpose of 25 kV transformer oil in power transformers is to provide electrical insulation and cooling. This oil has a high dielectric strength, which is essential for preventing electrical breakdown at 25 kV. Additionally, transformer oil dissipates heat generated during operation, maintaining optimal temperatures and ensuring reliable performance. Its chemical stability also protects against oxidation and degradation, extending the lifespan of the transformer.