(INMR, Vol. 16, No. 2, Issue-80, 2008, pp. 56-57)
Among the components that have been recognized as a source of potential problems at substations is the busing. Although a tireless workhorse that has performed reliably for many decades, the classical oil-impregnated paper (OIP) core, porcelain-housed style is nevertheless the one usually implicated whenever such rare problems do occur.
One of the relatively new technologies intended to improve the performance of bushings is resin-impregnated paper (RIP) core technology, often referred to as dry-type bushings. When equipped with silicone housings, such units are seen by many in the industry as the ideal solution to avoid potential problems such as oil leakeage/contamination or explosive shattering with danger to personnel and consequential damage to neighboring apparatus.
The ABB busings plant in Ludvika, Sweden manufactures about 12,000 units every year and RIP styles, whose production at the plant started just ten years ago, whose production at the plant started just ten years ago, already account for about 20 percent of this volume. Like at other such plants within ABB, management report that there has been strong in the bushings business over recent years.
