Advanced condition monitoring method for high voltage overhead lines based on visual inspection

This paper presents the advanced condition monitoring method for high voltage overhead lines (OHLs) using visual inspection without the need of highly qualified overhead line experts. The method is for technical condition assessment by minimizing subjectivity in the assessments process and thus maximizing the efficiency of visual inspections. Unambiguous results between inspection patrols are achieved by dividing OHL into assessable components with specific predetermined criteria. This enables to extend OHL’s expected lifetime with minimal resources by replacing only components that are in critical technical condition and therefore minimizing life-cycle costs. Methodology is designed for reinforced concrete and steel lattice towers using inspection patrols with specially designed tablet computer (tablet) applications. The aim of the proposed methodology is to minimize risks associated with poor technical condition and optimize replacement strategies throughout life-cycle of an OHL. This paper includes the results of implementing the methodology in Estonian transmission system.