Impact of Component Structure on Vibration and Noise of Converter Transformers Under Harmonic Excitation

Abstract

The internal component structure of the converter transformer plays an extremely important role in the generation and propagation of vibration noise. In order to comprehensively reveal the influence of the component structure on the vibration and noise of converter transformers, this paper conducted vibration and noise experiments on different combinations of three iron core structures, four winding structures, two oil tank structures, two foot insulation structures and three positioning structures under different frequency harmonic excitations in a semi-anechoic chamber environment. The results show that the optimal configuration for minimising noise in converter transformers comprises the following components: an entanglement internal screen winding within the coil assembly, a 7.2 mm six-step-123 iron core, a cross-shaped reinforced oil tank, bottom foot insulation, an upper eccentric circle design and lower pouring positioning.