Some Cool Powerline Data to Support NERC’s Rule 810 Recommendation

With the recent release of NERC’s “Recommendation to Industry” on October 7th, 2010, we have been contacted by many transmission companies to LiDAR their transmission lines.  The recommendation asks all Transmission Planning Engineers, Transmission Maintenance Engineers and Transmission Planners to measure and report any “Facility Ratings” that do not meet their intended design criteria based on actual field conditions.  The plan to achieve this must be submitted to NERC by December 15th, 2010.

This post discusses how we are supporting the industry with this compliance effort utilizing LiDAR, imagery and spatial analysis.

The first step in the process is the data collection effort focused on collecting precise powerline data and calibrating it to local control to achieve engineering-grade accuracies.

Classified LiDAR Point Cloud (Brown = Ground, Green = Vegetation)Classified LiDAR Point Cloud (Brown = Ground, Green = Vegetation)

The next process involves the creation of 3D vectors from the point cloud.  First, the raw point cloud is loaded into our Viewer.

Powerline Data Displayed by Elevation

Powerline Data Displayed by Elevation

 

 

 

 

 

 

 

 

Raw Point Cloud

Raw Point Cloud

 

 

 

 

 

 

 

Create Attachment Points at Conductor Location

Create Attachment Points at Conductor Location

 

 

Select 3 Locations along Line

Select 3 Locations along Line

Software Models Line Geometry in 3D from Point Cloud

Software Models Line Geometry in 3D from Point Cloud

 

 

 

 

 

 

 

Resulting Data set in EarthView Software:

Transmission Lines Modeled in 3D

Transmission Lines Modeled in 3D

 

 

 

 

 

 

 

 

Once the lines are modeled, we work with the agency to define the search criteria for performing the spatial analysis and encroachment analysis in the software.  We load these parameters and automatically identify the encroachments related to vegetation features and conductors.

Vegetation Encroachments Modeled in 3D and Highlighted in Blue (Grow-in) and Orange (Fall-in)

Vegetation Encroachments Modeled in 3D and Highlighted in Blue (Grow-in) and Orange (Fall-in)

Orthographic View of Potential Violations

Orthographic View of Potential Violations

 

 

 

 

 

 

 

 

Parcel data is then used to deploy field crews and empowers them with local information in the case they need to determine who is responsible for vegetation encroachment and property access.

Owner Information Incorporated into Vegetation Analysis

Owner Information Incorporated into Vegetation Analysis

 

 

 

 

 

 

 

 

Planimetric data is also created so that the information can be used to update line drawings and as-built information.

Planimetric Data Incorporated into Point Cloud

Planimetric Data Incorporated into Point Cloud

Planimetric Data Incorporated into Point Cloud

Planimetric Data Incorporated into Point Cloud

 

 

 

 

 

 

 

 

At the end of the day, we are able to generate many different types of deliverables for our clients.  The keys to this process include accurate calibration of data, 3D vector generation, encroachment automation, and industry-specific delivery formats.

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