Audible noise calculating method for high-voltage direct current electric transmission line

The invention provides an audible noise calculating method for a high-voltage direct current electric transmission line of 4 to 8 bundle conducting wires and can effectively solve the audible noise prediction problem of an extra-high-voltage direct current electric transmission line. The calculating method comprises three parts that (1) the surface electric field intensity of the conducting of the high-voltage direct current electric transmission line is calculated; (2) the audible noise level (in summer) of the high-voltage direct current electric transmission line is calculated; and (3) the audible noise level of other seasons is obtained through adding or reducing correction items. The calculating method is simple, the implementation is easy, the audible noise of the direct current line corona of the 4 to 8 bundle conducting wires obtained through the calculation can be preferably coincided with the measuring results of testing line in China through being compared with calculation results of other formulas. The direct current corona audible noise of multiple conducting wires, obtained through calculation by the calculating method provided by the invention can more adapt to the environment climate condition in China. The audible noise calculating method is particularly suitable for the extra-high-voltage direct current corona audible noise calculation when during the 4 to 8 bundle conducting wire adoption in north China.