Audible noise characteristics of EHV/UHV substations are paramount for the noise prediction and reduction.In this paper

the noise’s levels

spectrum distributions and attenuation characteristics of the transformers

highvoltage reactors and electrified structure in a 750 k V AC substation

as well as at the substation boundary

are measured and analyzed systematically. The results show that the noise level in the 750 k V substation is high

and interactions among the main noise sources exist. The transformer generates prominent low-and medium-frequency noise

and the cooling system has an impact on the spectrum distribution of the transformer noise. Moreover

the maximum sound pressure level of the reactors’ noise is 80.3 d B（A）

the minimum value of the electrified structure’s noise is 61.2 d B（A）

and the noise distribution at the boundary of the substation is closely related to the layout of the main noise sources.