A Three-Dimensional Prediction Method of Audible Noise of AC Transmission Lines Based on Line Sound Source Model

Abstract

Audible noise is one of the key factors affecting the selection of overhead transmission line conductors and the design of poles. Based on the line sound source model, a three-dimensional prediction method for AC transmission line noise is proposed, and the method is used for example analysis. The results show that: due to the influence of the line-height, at the same horizontal distance from the line the ground noise near the center of the file distance is the largest, which gradually decreases towards the end of the file distance, but the influence decreases with the increase of the horizontal distance; the noise along the line increases with the height and then decreases, and the maximum value appears at the high level of the line; in the line noise prediction work, it needs to take account of the influence of adjacent cross-line noise and ground factor. Compared with the measured values of the 1,000 kV UHVAC lines of the Anhui-East Power Transmission project, the predicted values of the proposed method are 0.9 dB(A) and 0.4 dB(A) larger at 10 m and 20 m outside the projection of the side phase conductors respectively, and the predicted results are consistent with the measured results.

Keywords

• ac transmission line
• audible noise
• line sound source
• prediction
• three-dimensional