Dynamic Analysis of Overhead Transmission Line under Turbulent Wind Loading

This paper compares the dynamic response of a test transmission line with the response due to static loads given by Eurocode. Finite element design software SAP2000 was used to model towers and power-lines. Nonlinear dynamic analysis including the large displacement effects was carried out. Macroscopic aspects of wind coherence along element length and integration time step were investigated. An approach is presented to compare the probabilistic dynamic response due to 7 different stochastically simulated wind fields with the response according to EN-50341. The developed model is used to study the response recorded on a test line due to the actual wind speed time history recorded. It was found that static load as calculated from EN-50341 underestimates the response of conductor cables. The response of coupled system considering towers and cables was found to be different from response of only cables with fixed supports.