Analysis of dynamic line rating on high voltage power lines

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Dr. Németh Bálint
Department of Electric Power Engineering

Due to the increasing annual energy demand and due to the continuously increasing renewable energy sources is the development of the transmission grid and increasing its transmission capacity necessary. Building new transmission lines is becoming more difficult to implement because of the strict rules and environmental standards so we need to look for other possible solutions. In Hungary the currently used so-called static thermal rating of transmission lines is based on worst-case weather conditions that neglects weather variability and also uses the line parameters to calculate the maximum transmission capacity which results significant unused reserve capacity of that line.

The so-called dynamic line rating is based on monitoring the parameters affecting the line rating so the transmission capacity can be increased substantially and the maximum ampacity of a transmission line can be calculated in real-time. With the continuous monitoring of transmission lines the reliability of the grid can be improved and it can also help avoiding unnecessary switch-offs and predict line rating changes.

The purpose of this thesis is to show development opportunities in ratings of high voltage transmission lines compared with the currently used rating methods in Hungary. During the examination of high voltage line ratings I present the possibility of using dynamic line ratings compared to the currently used static thermal rating. Based on foreign experiences I introduce different measurement sensors and equipment used in different countries which can help to calculate real-time dynamic line ratings of transmission lines. In the final part I prepare a draft action plan for possible implementation of dynamic line rating in the Hungarian transmission lines.


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