Augmentation of GIS at 230 kV substation August 4, 2017 | Asia Pacific Tenders International competitive bids are invited for the augmentation and rehabilitation of 33 kV gas-insulated switchgears (GIS) at the 230/132/33 kV Tongi grid substation on a turnkey basis. This content is available to only paying subscribers. Username or E-mail Password Remember Me Forgot Password