What is the role of the Buchholz relay in the protection of transformer oil?

The role of the Buchholz relay in the protection of transformer oil is to detect gas accumulation and oil movement within the transformer. It serves as an early warning system for faults, such as overheating or arcing, by sensing the gases produced during insulation breakdown. When gas is generated, the Buchholz relay activates, signaling potential issues and allowing for timely intervention to prevent damage to the transformer and its oil.