What is the design of hermetically sealed oil-filled transformers?

The design of hermetically sealed oil-filled transformers involves an airtight enclosure that prevents moisture ingress and oxidation, ensuring long-term insulation integrity. These transformers utilize a sealed tank filled with insulating oil, which also serves as a coolant. The design typically includes pressure relief devices, conservators, and breather systems to manage internal pressure and maintain oil quality. This configuration enhances reliability and reduces maintenance needs, making it suitable for various applications in power distribution.