AC power transmission line audible noise three-dimensional distribution calculation method

The invention provides an AC power transmission line audible noise three-dimensional distribution calculation method, which comprises the following steps of: firstly, acquiring the maximum field intensity Emax of the surface of a lead wire, a split lead wire number n and a sub-lead diameter d, dividing the lead wire into a plurality of tiny line segments by using an infinitesimal method, deducing a calculation formula of the sound pressure of the tiny line segments, further deriving a total sound pressure formula and a sound pressure level formula of audible noise generated at an observation point, performing integration on an included angle between a point sound source and the observation point along the lead wire according to the sound pressure level formula of the audible noise, acquiring sound pressure level distribution of a single lead in a span through summation, and acquiring a three-dimensional distribution condition of the audible noise through superposing three lines. According to the AC power tran