A method to estimate icing loads on overhead lines

Probabilistic design methods for overhead lines, such as IEC 826, set the question of statistical behaviour of weather-related loads, especially icing on cables. ysical models concerning wet snow and in-cloud icing have been developed by EDF; they can reconstruct icing events from standard meteorological data. nce, consistent weather records have been currently available since 1949, so the events can be recalculated on a 40 year approximately period. ions already treated by the mentioned models, some locations have been selected for a statistical analysis: 1. ograms, ch for fitted density functions (Weibull, γ, Gumbel) blishing return period values to be used by the IEC 826 probabilistic method. sults showed a peculiar pattern and also suggested a simplified density function. Simple prediction rules could be derived from this distribution. robabilistic analysis will be integrated in a nationwide mapping of in-cloud icing.