A transmission system that adjusts to the weather
The feed-in of renewable energy is increasing dramatically during the energy transition. In order to transport the high load flows, all capacities of the power line system are needed. However, the transmission capacity fluctuates according to the season and the weather. At colder temperatures and due to the cooling effects of the wind, more electricity can be transported than at other times, such as hot summer days. This is due to the characteristics of the conductor cables: when the cables get hot, they expand and tend to sag more.
Thanks to overhead line monitoring, however, we have been able to significantly increase the load-bearing capacity of our electricity transmission system. This is possible by making exact calculations of the maximum possible load flows at the current weather conditions in order for the amount of slack on the cables to stay within the technical specifications. The parameters needed for these calculations, such as wind speed and ambient temperature, are measured directly at the electricity pylons. Based on the collected data, we then determine whether to transmit more or less electricity. If weather conditions are favourable, we are able to increase the load-bearing capacity of the power lines by up to 50 percent.