In this paper

the audible-noise and vibration signals of a 220 kV three-phase oil-immersed power transformer are measured in no-load and loading conditions when it is in the debugging stage.The time-domain and frequency-domain characteristics of the audible-noise and vibration signals are analyzed.The coherence analysis between the audible-noise and vibration signals is also carried out.The result shows that large discrepancy exists between the audible noise and vibration characteristics in no-load and load conditions.The amplitudes of audible noise and vibration signals of transformer in load conditions are more obvious

and their main frequency changes.The noise level of transformer in the early operation stage should be used for substation noise prediction before it is constructed.The conclusions can be referred for substation noise prediction and the audible-noise control of three-phase oil-immersed power transformers.