For obtaining "100 Hz" pure tone distribution law of 750 kV/330 kV mixed voltage quadruple-circuit transmission line on the same tower

in this paper

the pure tone propagation model of 750 kV/330 kV mixed voltage quadruple-circuit transmission line on the same tower is established on the basis of calculation formula of pure tone excitation per unit length of conductor proposed by EPRI of the United States and compared with A weighted sound level of wide frequency band so to obtain the "100 Hz" pure tone distribution law under different wire layout

different heights and also with consideration of time and space.It is shown by the result that the "100 Hz" standing wave is asymmetric with respect to the center line.With the increase of the distance to the center line

the oscillation of the pure tone standing wave attenuates and the distance between the adjacent wave peaks becomes larger and larger.At the same position

the pure tone standing wave changes periodically with time.While

at different heights

the variation trend of pure tone standing wave is different and the amplitude difference is large.Under different layout modes

the amplitude of pure tone and the distance between adjacent wave peaks are different and the monotonic drop point appears 600 m away from the center line.