Dr. De Fina received her M. S. Degree in Electrical Engineering from the Milano Polytechnic University in 2003. After graduation, she joined different companies in Energy and Automation business, working in technical area. Since 2017, she has been working as R&D Expert at GE Grid Solution for HVDC and RIP AC bushings and also in charge of development of HVDC bushings. She is member of the Italian Committee 36A – Bushings and is active in IEC Working Groups.
Bushings play a major influence in reliability of transformers and require good thermal dissipation behavior, reliable internal and external electrical insulation and adequate mechanical strength. The main technologies for internal insulation are oil-impregnated paper (OIP), resin-impregnated paper (RIP), resin-impregnated synthetic (RIS) and SF6, each offering relative advantages and disadvantages. All technologies are characterized by very high reliability based on service and manufacturing experience. This presentation discusses the findings of recent R&D work aimed at demonstrating suitable design criteria to ensure long service life of dry RIP bushings, where growing market demand relates to their safety aspects.