Gis Substation Package Ss-90: For (i) Extn. Of 765/400kv Nizamabad Gis Substation Including 765kv Bus Ducts, Bushings, 400kv Gis Bays Etc. Under Augmentation Of Transformation Capacity In Southern Region; (ii) (a) Extn. Of 400/230kv Tuticorin-ii Gis S/s F (EXPIRED)