3 mile - 230kV Greenfield Transmission Line Project

PROJECT DESCRIPTION:

PowerWright Technologies Inc. was contracted by an investor owned utility in the Southeastern United States to complete a three mile greenfield transmission line project tapping into an existing 230kV transmission line and connecting it to another, to bypass two existing substations.

Highlights of this project include:

  • Project featured the use of spun concrete mono-pole structures
  • Project located near an existing power plant within a congested transmission corridor
  • Due to congestion within the corridor, this project featured the crossing of six other transmission lines (including 138kV, 230kV, and 500kV crossings)
  • Project included one major river crossing
  • Project included the design and permitting of a new at-grade patrol road
  • An intensive geotechnical investigation was required due to poor soil conditions, particularly near the river crossing

7.8 mile – 138kV Transmission Line Relocation/ Rebuild Project

PROJECT DESCRIPTION:

PowerWright Technologies Inc. was contracted by an investor owned utility to complete the relocation of an existing transmission line to facilitate an ampacity upgrade. The first 2.8 miles of this project included relocating the existing transmission line approximately two blocks to the east, co-locating it along an existing railroad corridor. When the transmission line veered away from the railroad corridor and re-joined the original alignment, the remaining 5 miles of line were rebuilt using a combination of tubular steel and spun concrete monopole structures.

Highlights of this project include:

  • Project utilized both concrete direct embedded monopoles and steel poles on drilled pier foundations
  • 57 miles of the project traversed an environmentally sensitive wetland area, requiring a permanent patrol road to be built and extensive environmental permitting support
  • Portions of the project were located within residential areas and required PowerWright to support public outreach meetings
  • Portions of the project were built along a congested urban right-of-way, and required constant construction support to mitigate subsurface conflicts

NERC Alert Point of Interest (POI) Remediation

PROJECT DESCRIPTION:

PowerWright Technologies Inc. was contracted by an investor owned utility to complete the remediation of all POI’s found within 3 of its 5 total geographic regions. As a part of this work, PowerWright received LiDAR data from the utility and used it to identify any NESC clearance violations; after the issues were identified, the design team used their expertise to craft the most efficient and cost effective method of POI correction.

Highlights of this project include:

  • 550+ transmission structures designed/replaced to eliminate nearly 300 POI’s
  • 100+ individual POI remediation projects completed
  • 30-day required turnaround time from the identification of a POI to the completion of the material/pole ordering process to remediate the issue

Project pictured above remediated clearance to building POIs along a busy road near downtown Miami. Engineers had to think “outside-the-box” to determine a viable solution without moving poles any closer to the road or cutting off service to the existing substation to the east for any extended amount of time. As a result, 14’ long arms, with custom designed connections to the concrete poles, were created to move the wire westward, away from the buildings, while maintaining the pull-offs to the east.

1.8mile 115kV Water Crossing

PROJECT DESCRIPTION:

PowerWright Technologies Inc. was contracted by an investor owned utility to complete the replacement of an existing inter-coastal waterway transmission line crossing near Cocoa Beach, Florida.

Highlights of this project include:

  • Waterway at location of transmission crossing is approximately 1.8 miles wide
  • Included replacement of existing poles with new custom designed two-piece spun concrete monopoles in waterway
  • Concrete monopoles were up to 185’ long (both tangents and deadends), and were designed to be jetted to an embedment of 51’ below the river bed

PowerWright supported the permitting of the project with the Army Corp of Engineers as well as the Florida Department of Environmental Protection.