Supply works of 110 kV power transformer September 29, 2017 | Europe Tenders International competitive bids are invited for the supply of a 40 MVA, 110 kV [oil-filled, naturally air-cooled (ONAN)]/50 MVA [oil natural air forced (ONAF)] three-phase oil power transformer. This content is available to only paying subscribers. Username or E-mail Password Remember Me Forgot Password