Prediction Model And Application Study On Combined Load Equivalent Ice Thickness Of Overhead Transmission Line

Transmission line and towers are easily collapsed and broken down by heavy icing and snow cover, which bring serious threats to the safety of power system and stable development of the national economy. Domestic and foreign scholars have been studying in the research field for long, which makes more people focus on it. Throughout the existing theoretical models, all of them neglect unequal loading due to increases of combined load caused by wind force and strain insulator string as well. At the same time, seldom being verified lead the accuracy of these models to be questioned. Therefore, this paper is written to come up with a new model as well as verify the accuracy of it via provided experimental data.This paper, which based on the theory of the mechanical calculation theory and static equilibrium, presents a new model for predicting the equivalent load of transmission line via angle and tension(sensor). The unequal loadings due to increases of combined load caused by wind force and strain insulator string are taken into consideration when came up with the new prediction model. By using the test parameters, calculation via the model can be accomplished. The results are compared with the manual measurement as well as a highly recognized prediction model respectively in order to confirm the accuracy of the model devised in this paper. Eventually, the engineering application of the model is analyzed when put the data which collected from a 500 kV line in Guangdong province into the model. The results indicate that the model is proved to have good performance when applied to icing forecasting of overhead line. By the end of the paper, the corresponding measurement of ice melting is put forward.