Client Kleinfelder/Western Farmers Electric Cooperative (WFEC)
Location Western, Oklahoma
Scope 1,500 transmission intersections (individual power line spans) covering the WFEC 138 kV transmission line system.

Western Farmers Electric Cooperative

Project Details

Westwood’s Role

  • Surveying
  • Aerial Mapping
  • Plan and Profile Sheets

Overview

Westwood completed transmission intersection mapping for 1,500 power line spans in Oklahoma as part of the North American Electric Reliability Corporation (NERC) advising power companies to verify transmission lines 100 kV and higher meet minimum ground clearance requirements.

Quality Data through Careful Planning and Record Keeping

The 1,500 transmission intersections (power line spans) identified for the project were neither sequential nor located along a contiguous route, which required careful planning and record keeping. Westwood was required to find and identify the correct intersection, collect the LiDAR data, and generate the aerial map.  Since temperature affects line sag and ultimately impacts the ground clearance of individual spans, Westwood also documented and verified weather records specific to the time of day that each span was recorded. Attention to detail was critical to ensure LiDAR data, aerial oblique images, and ambient weather conditions were accurately recorded for each of the 1,500 profile sheets.

Weather was a contributing force during the project. High summer temperatures impacted the amount of time the LiDAR-equipped helicopter could spend in the air, affecting both the timing and cost of the project. Survey areas selected for the project were those identified as having structures, other power lines, natural features, or roadways passing beneath the power line.  The 1,500 datasets were delivered to Kleinfelder, who used PLS-CADD and GIS software to perform the engineering required to ensure NERC compliance for WFEC.