The FAC requires a dynamic model in which the line is swung through its physical limits for analyzing behavior in high wind conditions (termed blowout). This information is passed on to a vegetation management function of the transmission line operator (either in-house or out sourced). The general idea is to measure existing vegetation as well as line location and model so-called grow-in and fall-in vegetation. This is primarily vegetation or the ground. Transmission Vegetation Management (TVM) is the process of controlling the hazards of lines touching or arcing over to objects that would cause a fault. The majority of line rerating analysis is performed using a product called PLS-CADD from Madison, Wisconsin-based Power Line Systems. Increasing the rating (the real desire of the transmission line operator) allows the operator to service a heavier load without building out new lines.
Lowering the rating is obviously a safety issue.
The rerating may indicate that a line can carry less or more current than its original (build-to) design capacity. Line rerating is the process of analyzing existing transmission lines with respect to the amount of current the line can carry under certain ambient conditions (primarily temperature). The two that are of particular interest to LIDAR operators are Line Rerating and Vegetation management. This is the third edition of our series on transmission corridor management using LIDAR.As detailed in the first two articles, transmission corridor management comprises a number of tasks.
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