However, the models require adequate validation. For non-contact technologies, there is no need for the de-energising of line for installation and maintenance, and all the weather parameters required for local weather fore-cast can be measured directly. The technologies differ, especially in terms of the effort required for installation and the need for modelling. Maximal allowed operating time in case the loading surpasses the current carrying capacity of the conductor.Non-contact technologies: the key DLR results are calculated based on weather data from meteorological models and/or locally measured weather data and line load: Calculation of sag based on the angle of the line at the span point (1).Calculation of sag based on the vibration frequency of conductors.Calculation of sag through measurement of tension.Conductor temperature measurement with the help of temperature sensors.In general, there are two main technology groups (contact and non-contact) used to acquire the DLR results:Ĭontact technologies: measure physical parameters of the conductor like: Upon working with the key future operational conditions, DLR requires weather forecasts in order to allocate the possible additional capacity to the market in system operator processes (IDCF intra-day congestion forecast, DACF day ahead congestion forecast, WAPP week ahead. As sag has a relatively small time constant, the maximal temperature can be reached quickly (approximately 15 min). The application of DLR requires knowledge about the maximal allowable temperature of OHL conductor, which is also proportional to sag. The major task thereby is to derive the present and forecast the future ambient conditions, calculate the current carrying capacity, and integrate these results to dispatch centre processes, considering adequate security margins. As less severe weather conditions exist for most of the year, the ampacity of the existing lines can be significantly increased (up to 200 %). The Dynamic Line Rating (DLR) of OHL uses the fact that the ampacity of OHL depends on ambient conditions and the OHL are designed for high summer weather conditions.
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