Combining dry type Resin Impregnated Fiberglass paperless transformer bushings with built-in novel insulation monitoring function

By comparing the existing types of transformer bushings, this paper reviews distinctive features of RIF™ (Resin Impregnated Fiberglass) paperless condenser bushings; and, in more detail, it introduces principles, construction, characteristics and applications of this type of bushing when used with a new, safer and reliable built-in insulation monitoring function. As the construction of RIF™ insulation would delay the propagation of a core insulation breakdown after the onset of an initial insulation defect, this type of real time monitoring of core insulation condition provides a novel tool to manage bushing defects without any sense of urgency. It offers, for the first time, a very early field detection tool for transformer bushing insulation faults and by way of consequence, a much improved protection of power transformers over their operating life.