Coupling Characteristics of Noise Radiation and Tank Wall Vibrations of Typical Distribution Transformers Based on Field Measurements

Distribution transformer noise is one of the main factors affecting residents near substations. Studying the relationship between vibration and sound radiation characteristics of tank wall surfaces of typical distribution transformers is of great significance for corresponding noise and vibration control. In this paper, field measurements are conducted to study the coupling between tank wall vibration of 35kV and 110kV distribution transformers and their corresponding near-field and far-field sound radiation. Results show that, vibration and noise radiation of two typical surfaces of distribution transformer are mainly concentrated between 200 Hz and 500 Hz. Coherence between vibration and sound signals proves the strong coupling between the tank wall vibration and noise radiation of distribution transformers.