Investigation on the AMDT Core Vibration by Modal Analysis and Validation of the Noise Reduction Effect by Testing Platform

Controlling the noise caused by the vibration of amorphous metal distribution transformer (AMDT) has important application value in transformer industry. Magnetostriction is the main cause of the core noise when the AMDT core operates under no-load condition. In this paper, the one phase core modal analysis of AMDT was executed by finite element analysis (FEA). The vibration area on the upper yoke of the core is stronger at mainly 100 Hz and 200 Hz. Clamping stress on the core was a fairly useful way to reduce noise of SCBH 15-200/10 AMDT. The weights of different weights were tied with the insulation ribbon, and the insulation ribbon was bound around the upper yoke of the core to produce different clamping stress on the core. In addition, an UT-351 noise meter was used to measure the noise at the distance of 0.3 m from the outline of the AMDT core to verify the noise reduction effects. It is presented that applying clamping stress to the upper yoke of the core can reduce the vibration and noise of the AMDT core.