Projects for Rosseti FGC UES, PJSC

Objective

In line with the FGC UES Investment Program for 2018-2020 approved by Order No.31 of the Ministry of Energy dated 27 December 2017, and Unified National Energy Grid Overhead Line Clearing Expansion Program operated by the branch offices of FGC UES PJSC – Main Electric Grids, the key objectives of this project are to develop the design documentation and coordinate it with the branch offices of FGC UES in regard to restoring the statutory width of the clearing based on the UAV monitoring of the transmission line condition and processing of the results using a three-dimensional model of the transmission line route in the survey area, acquiring all geometric parameters of the transmission line, including in relation to vegetation, as well as to develop and coordinate the procurement documents for subsequent works on extending the transmission line clearing.

ДFor information: The project includes cutting down trees and shrub vegetation on the previously cut clearing and widening the clearing on both sides of the overhead line in order to ensure safety and prevent wire damage by fallen trees. Individual trees or groups of trees growing outside the clearing and threatening to fall onto overhead wires or poles shall be cut down in a timely manner.

The solution

In order to prepare the design documentation, the overhead transmission lines were monitored using UAV technologies in areas requiring the clearing width to be restored to statutory values.

After the aerial survey work was completed, the aerial photographs were processed in Agisoft Metashape Pro software, which produced an array of spatial data: orthophoto maps, digital terrain models and digital surface models, three-dimensional wireline models. In addition to obtaining spatial data, the coordinates of overhead line towers were reviewed.

The survey results were loaded into the “Sputnik LEP” GIS. The system automatically produced tables of input data for calculating the maximum current loads and tables with survey data for expanding the overhead line clearances, the data from which were used to prepare the design documentation.

Results

Engineering analysis of the surveyed overhead lines identified forested areas that require cutting trees, woody growth and shrubs.

We should note that UAV survey results are more accurate than in-situ surveys, as the latter might result in a substantial increase of the cutting area due to using “standard” shape calculations, which in turn will lead to additional costs during the cutting works. The clearing areas calculated from the aerial survey data are based on actual data, i.e., calculated from the actual condition of the forest clearance.

Based on the engineering survey results, design and procurement documents were developed for restoring the statutory width of the clearing.

As a result of the work performed by FGC UES PJSC, tenders were announced to perform the overhead line clearing works.

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