An experimental device for simulating the dynamic characteristics of high-voltage transmission wires under the action of downburst

Abstract

The invention discloses an experimental device for simulating dynamic characteristics of a high-voltage transmission conductor under the action of downburst. The experimental device is characterized in that four vertical columns of a rectangular supporting platform are fixed onto the ground, and an axial flow fan is mounted on the rectangular supporting platform. Wind speed is regulated by a frequency converter, and different downburst wind speeds are simulated. The transmission conductor is simulated by the aid of a hollow aluminum tube, and two solid shafts are welded at two ends of the aluminum tube respectively. Two spring-damping systems are suspended at two ends of each solid shaft respectively and fixed to two rectangular frames, and the dynamic characteristics of the hollow aluminum tube at different dip angles, different wind angles and different positions are analyzed by horizontal and vertical relative movement of the rectangular frames. A nozzle and a water supply device are connected with each other and fixed at a 1m position under the axial flow fan, water is sprayed to the hollow aluminum tube to simulate various rainfall states, and the water supply device comprises a water reservoir and a water pump. Rainfall is adjusted by an adjusting valve. A displacement sensor and an acceleration sensor are mounted on the outer sides of the two ends of each solid shaft respectively, and acquired signals are transmitted to an acquisition card through a data line.

Description

technical field [0001] The invention relates to an experimental device for dynamic characteristics of a high-voltage transmission wire, in particular to an experimental device for simulating the dynamic characteristics of a high-voltage transmission wire under the action of a downburst. Background technique [0002] The characteristics of downburst loads and their hazard effects on transmission line-tower structures are current frontier research topics in the field of international wind engineering. In particular, in recent years, UHV transmission towers have become increasingly characterized by towering structures, thick conductor cross-sections, and long spans. Their structures are extremely sensitive to the coupling effect of downburst wind field and heavy rainfall, and are prone to induce large oscillations and even tower collapse accidents. In order to reveal its inducing mechanism, researchers put forward various hypotheses. Most scholars believe that the load attribu...

AI Technical Summary

Problems solved by technology

However, heavy rainfall simulation, downburst wind field, large span and nonlinear characteristics of transmission lines make it difficult to carry out simulation experiments

Therefore, at present, there is still a lack of an effective simulation experiment method for the study of the dynamic characteristics of high-voltage transmission lines under the action of simulated downbursts.

Images