Reduction of Vibration Noise for Amorphous Metal AlloyCore Distribution Transformer

To understand the vibration noise behaviors of amorphous metal alloy core distribution transformer（AMACDT）, a 10 kVA prototype was tested under no-load and short-circuit conditions, respectively. The vibrationcharacteristics were described when rated voltage was applied to the secondary side, and the primary side was connectedwith different load resistances. The largest amplitude positions on the upper bracket and tank surfaces wererecorded by vibration sensors arranged on the surface. A data-acquisition platform was set up for signal measurement.The vibration amplitude related to frequency was discussed, and experimental results indicated that the positionwith the largest amplitude accrued in the middle of the upper bracket and tank surface, at phases a and c, respectively.The experimental results suggest that magnetostrictive and electrodynamic forces play a major role inexciting the vibration noise. At the same time, some rib-reinforcements were welded on the upper bracket and tanksurfaces to lessen the vibration energy, which reduced the noise.