East Columbus 161/69 kV Substation

East Columbus - Columbus Utilities

Columbus, Mississippi

Atwell & Gent provided full planning, design, procurement and construction administration services required to replace existing single-phase three-winding power transformers with a new three-phase autotransformer, replace existing electromechanical relaying with new digital relaying, and update existing protection schemes with new breaker failure schemes. Our firm was responsible for the procurement of major equipment (autotransformer, substation steel, substation materials, relay and control house, DC battery system, relay panels, relays, cables, etc.), review of vendor submittals and drawings and incorporation of final vendor drawings into the final construction package. Atwell & Gent was responsible for the construction administration of the project, including project coordination and scheduling, field inspections and substation acceptance testing.


Project Details: 

  • Installation of a new three phase autotransformer, a new relay and control house, replacement of all electromechanical overcurrent, backup overcurrent, transformer differential, and bus differential relaying with new digital relays, and implementation of breaker failure schemes. 
  • Extensive programming, logic, testing and commissioning to ensure proper operation under a variety of system conditions.
  • Design and construction services included foundations, power and control raceways, station grounding, new control house, physical layout (section and elevation drawings), and electrical and controls physical layout and connections (single-line, three line, schematic wiring and point-to-point wiring drawings), relay panel drawings, elementary, current and potentials drawings.