Overhead line weak point mechanical analysis based on Markov chain method

Abstract

In this work, a concept for overhead power line weak point analysis based on the calculation of minimal clearance to ground is presented. Line temperature should be known before mechanical calculations are performed. For that purpose IEEE 738 Std. was taken. Calculation accuracy was previously verified by authors with real line parameters and described in the paper. To calculate thermal behavior of conductor, several parameters should be known, such as wind speed, wind direction and ambient weather temperature. These data were artificially generated from three weather stations ten years' time series located near to the line. To acquire the data on line, the interpolation geostatistical toolbox was used. Several line weak points were revealed. Line weak point position can be used as an area where monitoring equipment for dynamic line rating should be installed when the transmission system operator has an economical restriction, and it is impossible to have multiple areas for DLR equipment installation.