What factors influence the design of high voltage transformer bushings?

Factors influencing the design include voltage rating, current-carrying capacity, mechanical stress, and environmental conditions like humidity and temperature. The choice of insulation material, oil or gas for cooling, and the type of bushing (oil-filled, solid, or gas-insulated) are also critical. Designers must consider the need for thermal expansion, easy maintenance access, and the bushing’s compatibility with the transformer’s overall electrical and mechanical requirements.