DYNAMIC LINE RATING IN OVERHEAD TRANSMISSION LINES. MONITORING METHODS AND FIELD APPLICATION

This paper presents different methods for overhead transmission line monitoring and the calculation of dynamic line rating. Some of these techniques are based on the reading or the prediction of the whole set of meteorological variables involved in the corresponding equations, whereas other methods use direct or indirect measurements of the conductor temperature. Additionally, a correction method will be described for incomplete monitoring situations. Finally, a real case study is presented for a 220-kV overhead line, where a double monitoring technique is considered for the calculation of the dynamic line rating, with a remarkable improvement in the utilization of the assets, compared to the seasonal rating.

Keywords: Dynamic line rating, overhead transmission lines, grid operation and planning, electric power system monitoring.