Retrofitting of 245 kV OIP bushing with longer oil-end

This article focuses on an original case-history of replacement of a leaky 245 kV OIP bushing of a 220/132/33 kV, 160 MVA, transformer on site at the 220 kV Jabalpur substation, in Madhya Pradesh state in India with an available 245 kV OIP bushing having longer L-2, Fig. 1. To retrofit the same turret-adopter, an extension piece was fabricated, with an innovative idea of utilizing locally available materials and in-house resources in minimum downtime on site, without re-locating or dismantling the transformer, thus giving the transmission and the distribution utilities tangible advantages such as large savings of revenue by way of dismantling transportation of the transformer to the OEM’s works for its repairs; repair charges, post-repair transportation to the site followed by erection and commissioning of the transformer on the site etc. and also avoiding dissatisfaction amongst all categories of consumers at large