Dynamic rating of transmission lines-a New Zealand experience

This paper presents a real world application of dynamic line rating (DLR) by the line-tension monitoring method. There are several methods to rate transmission lines in real-time of which the tension-monitoring method has demonstrated more advantages. Transpower, the transmission company of New Zealand, has investigated the application of DLR on two of its circuits. The experiment has been set up using the hardware and software provided by Valley Group, USA, and some interesting experiences are documented in this paper. The analysis of the results provided by the experiment demonstrated the real capabilities of Transpower´s transmission lines, which are also discussed in this paper. It is concluded that dynamic line rating can contribute towards efficient control of transmission lines