138kV Breaker and a Half SWYD

Engineering and Construction Services:

  • Four (4) Bays
  • Five (5) Lines Coming In and Out
  • Included Current Limiting Reactors

115kV, 230kV, and 345kV Projects

EPC Scopes:

  • (2) – 345kV 3 breaker ring SWYD expandable to a future BAAH
  • (1) – 115kV 3 Bay BAAH SWYD
  • (1) – 115kV 3 breaker ring SWYD
  • (2) – 345kV SWYD Expansions
  • (1) – 345kV 3 Bay BAAH SWYD
  • (1) – 115kV SWYD Expansion

Lake Charles Transmission Project

EPC Scope:

  • (1) – 500kV 3 breaker ring switching station
  • (1) – 500kV Transmission Line – 6 miles
  • (1) – 500/230kV Switching Station
  • (3) – 230kV Lines – Greenfield/Rebuild – 23 miles
  • (5) – 230kV Substation Expansions/Modifications
  • (1) – 230kV River Crossing Demo/Rebuild – Including Explosive Demolition

W.A. Parish Peaker Project

In late summer 2012, Dashiell accepted a project with an aggressive project schedule to design and build a 138 kV generator interconnect substation and a 138 kV interconnecting transmission line for a new peaking power plant being built by NRG at the W.A. Parish power plant near Richmond, Texas. Although the facilities themselves were not technically difficult to design and build, the number of interfaces between existing NRG facilities, the new peaking power plant and Centerpoint created a number of challenges for the project team.

On Thursday, June 6th, Dashiell successfully energized the interconnect substation bus by re-energizing the transmission line from the Centerpoint substation to the NRG W.A. Parish Unit #7 Standby Transformers. On Friday, June 7th, the interconnect breaker to the new generation facility was closed, energizing the transmission line and back-feeding the new power plant through the Generator Step Up Transformer. Even with all of the interface issues that challenged our energization, Dashiell completed this project a full week ahead of our commitment to the customer.



Horse Hollow Generation Tie – 345kV-138kV Substation

Project Description: Dashiell provided an EPC turnkey project for a 345kV – 138kV substation as part of the Horse Hollow Generation Tie Project. The station consisted of a 2 breaker 345kV tap substation with a single incoming line, two (2) 555MVA 345kV – 138kV transformers and a 3 bay 138kV breaker and a half substation. The switchyard was designed as an interconnect point for the operation of a 1000MW wind park in Kendall County. 100% of the design for this station was by Dashiell, including site grading, structures, foundations, conduit, grounding, lightning protection, station lighting, control building layout and specification, electrical plans and section, installation details, protection and control single line drawings, schematics and wiring, communications/SCADA, relay control panels, relay coordination settings, and equipment specifications. Due to the critical nature of this project, Dashiell completed design and construction in 9 months, from notice to proceed.