Research on Full-Scale Measurement of Non-Uniformity of Wind Pressure of Power Transmission Conductor

摘要

Conductors of transmission lines are long and have high flexibility, which are obviously influenced by wind loads. The non-uniformity of wind pressure of conductors along the transmission line direction is crucial to the wind-resisting design of power transmission tower-line systems. In this paper, through distributing wind pressure sensors on the whole conductor, the wind load information of the whole conductor is monitored simultaneously. The statistical characteristics and value taking laws of the wind pressure nonuniformity of the conductor are investigated for mean and fluctuating wind, respectively. Results show that by adopting the Generalized Extreme Value distribution model, the probability distribution characteristics of non-uniformity coefficients of mean wind pressure of conductor can be reflected well. The value taking of its probability statistical parameters is stable, which meets ergodic properties of steady-state distribution samples. For the non-uniformity characteristics of fluctuating wind, its spatial correlation coefficient is gradually reduced with the distance increasing; when the distance is increased to about 60 m, in most cases, the decay rate of spatial correlation coefficient is reduced obviously and even reaches the steady state. Meanwhile, the probability distribution of turbulence integral scale meets the characteristics of extreme value distribution, with the mean value of 9.521m. More than 90% samples are distributed within 0-40m.