Structure-vibration Analysis of a Power Transformer(154kV/60MVA/Single Phase)

The most common cause of power transformer failures is mechanical defect brought about by excessive vibration, which is formed by the combination of multiples of a frequency of 120 Hz. In this paper, the types of mechanical exciting forces applied to the power transformer were classified, and the mechanical damage mechanism of the power transformer was identified using the vibration transfer route to the machine or structure. The general effects of 120 Hz-vibration on the enclosure, bushing, Buchholz relay, pressure release valve and tap changer of the transformer were also examined.

Authors:

• Young-Dal Kim
• Jae-Myung Shim
• Woo-Yong Park
• Sung-joong Kim
• Dong Seok Hyun
• Dae-Dong Lee

Keywords:

• Structure-Vibration
• Transformer.

References:

[1] Mou, Gang. Modeling and Control of a Magnetostrictive System for
High-precision Actuation at a Particular Frequency. 2002. pp. 4-5.
[2] Dukkipati, Rao V. Advanced Mechanical Vibration.
[3] David Jiles, "Introduction to magnetism and magnetic materials",
Chapman and Hall, pp. 89-106, 1991.
[4] M.J. Dapino, R.C. Smith, A.B. Flatau "An active and structural strain
model for magnetostrictive transducers", SPIE symposium on Smart
Structures and Materials, 1998, Paper#3329-24.