Princess Royal 33/11kV Substation - 11kV Switchboard Replacement. Modification of circuit design and interface engineering associated with the new 11kV switchboard with existing protection schemes, which also included specifications for the new LVAC switchboard, 110V and 48V DC battery equipments, to allow the main contractor to procure this equipments. Lime Tree Place 33/11kV Substation - 33/11kV Transformer Replacement. Modification of circuit design and interface engineering associated to facilitate the replacement of the existing 33/11kV transformer T2 and removal of 33kV switchgear at Lime Tree Place substation. Including circuit and interface designs to match the intertripping changes at both ends.