What is the effect of corona on transformer oil?

The effect of corona on transformer oil can lead to the generation of harmful byproducts, such as acids and gases, which degrade the oil’s insulating properties. Corona discharge occurs when high voltage causes ionization of the surrounding air, resulting in partial discharges that can create localized heating and stress within the transformer. This degradation can ultimately reduce the lifespan and efficiency of the transformer, necessitating regular monitoring and maintenance of the transformer oil.