Relaying Retrofit

Northeast Starkville 161/13 kV Substation

Starkville Utilities

Starkville, Mississippi

Atwell & Gent provided full planning, design, procurement, and construction administration services required to provide completely replace existing electromechanical relaying and update existing protection schemes with new fast bus and breaker failure schemes. Design services for this project included trench duct, power and control raceways, grounding, electrical and controls layout and connections (single line, three line, schematic wiring, and point-to-point wiring drawings), relay panel drawings, elementary, current and potentials drawings. Our firm was responsible for procurement of major equipment (relay panels, relays, cables, etc.), review of vendor submittals and drawings, and the incorporation of completed vendor drawings into the final construction package. Atwell & Gent was responsible for construction administration of the project, including project coordination and scheduling, field inspections, and substation acceptance testing.

Project Details:

  • Replacement of all electromechanical backup overcurrent, differential relaying with new digital relays, implementation of fast bus and breaker failure schemes for both normal split bus and tied bus operation.
  • Required extensive programming, logic, testing, and commissioning to ensure proper operation under a variety of system conditions (normal split bus, tied bus, one bank out of service, main VCB bypassed, etc.).