The limitation of transformer noise

Churcher, B.G.; King, A.J.

doi:10.1049/jiee-1.1940.0162

Cited by 8 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e three-phase transformer is the critical component of electric power systems, which plays the role of transporting electromagnetic energy from the power station to residential buildings [1][2][3]. Generally, the radiated noise caused by the transformer presents low-frequency characteristics, which has a destructive effect on the surrounding residents and equipment [3][4][5][6][7]. So far, the sound insulation measures can effectively reduce the propagation of transformer noise in air, but the noise reduction efficiency is limited [8,9].…”

Section: Introductionmentioning

confidence: 99%

High‐Efficiency Vibration Isolation for a Three‐Phase Power Transformer by a Quasi‐Zero‐Stiffness Isolator

Cao

Chang

Zhou

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

The vibrations generated by a three-phase power transformer reduce the comfort of residents and the service life of surrounding equipment. To resolve this tough issue, a quasi-zero-stiffness (QZS) isolator for the transformer is proposed. This paper is devoted to developing a QZS isolator in a simple way for engineering practices. The vertical springs are used to support the heavy weight of the transformer, while the oblique springs are employed to fulfill negative stiffness to neutralize the positive stiffness of the vertical spring. Hence, a combination of the vertical and oblique spring can yield high static but low dynamic stiffness, and the vibration isolation efficiency can be improved substantially. The dynamic analysis for the QZS vibration isolation system is conducted by the harmonic balance method, and the vibration isolation performance is estimated. Finally, the prototype of the QZS isolator is manufactured, and then the vibration isolation performance is tested comparing with the linear isolator under real power loading conditions. The experimental results show that the QZS isolator prominently outperforms the existing linear isolator. This is the first time to devise a QZS isolator for three-phase power transformers with heavy payloads in engineering practices.

show abstract