Description:

TOTH engineered and designed a metal clad switchgear replacement at an existing 44.8 MVA, 69/13.8 kV distribution substation on the Owner’s system. Significant upgrades included demolition of the existing switchgear enclosure, foundation, and 69 kV bus potential transformers, as well as installation of a new switchgear enclosure and foundation, new dual transformer oil containment and drainage facilities, new 69 kV potential transformers and steel, new lightning mast, relay panels, and AC/DC panelboard replacements. Relaying and control logic were designed to protect the transmission lines, the transformers, and the distribution switchgear while conforming to IPL Relay Settings Philosophy. SCADA and communication documentation were also updated. Work also included replacement of a line relay panel at a remote substation, and transmission upgrades to install new weathered steel poles with gang operated disconnect switches at a 69 kV transmission line junction on the Owner’s system.

Services – TOTH’s design and drawing package services included civil, structural, and electrical engineering for the following aspects of the project: field topographical survey, site work/grading, foundations, steel structures, general arrangement, lightning protection, auxiliary AC and DC systems, low voltage wiring design, material list, and demolition of existing facilities. In addition to the design, TOTH reviewed and enhanced the Client’s specifications for switchgear, 69 kV potential transformers, relay panels, and the primary construction specifications to assist the Client and its procurement processes.