Application of Micro-perforated Panel in the Reducing Noise of an Oil-Immersed Amorphous Metal Core Transformer

Abstract

This paper focuses on reducing the vibration noise of amorphous metal alloy core distribution transformers (AMDTs) with a micro-perforated panel (MPP) absorber. A micro-perforated sound absorption structure was designed and installed in the inner sides of the tank circumference. To understand the reduction in vibration noise behaviors of AMDTs installed with MPPs under normal operation, an AMDT model was used as the test object, and a single MPP, double MPPs, and different backed cavities filled with transformer oil were investigated experimentally and compared when rated voltages were applied to the AMDT model. Testing was also implemented with the application of different applied voltages to the AMDT. A data-acquisition platform was set up for signal measurement. The results validate that the performance is improved by partitioning the backed cavity into differently sized sections, and that the performance is affected when the cavities are filled with transformer oil, and over-excitation voltages are applied to the AMDT model.