Abstract
This paper investigates the relationship between the cost associated to lightning protection systems (LPS) and the back-flashover rate (BFR) in high voltage transmission lines. The fundamental research question raised is how to determine the incremental cost of the mitigation measures associated to a prescribed back flashover rate. The interaction of tower supplemental grounding and tower insulation design is analyzed satisfying a given reliability level at minimum overall investment cost. A new optimization model relating back flashover phenomena to expenditure in LPS is presented expressly accounting the dynamic behavior of the tower footings being suitable to be applied using any existing BFR evaluation methodology. To illustrate the method, practical study case based on the step-by-step Anderson-EPRI method is presented. Despite the EPRI method has limitations, its simplicity is useful to illustrate the calculation of incremental cost curves of LPS without resorting to simulation software. Researchers are encouraged to apply the method using other BFR evaluation methodologies.
Published Version
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