Identification of Transformer Core Vibrations and the Effect of Third Harmonic in the Electricity Grid

Authors: Setareh Gorji Ghalamestani, Lieven Vandevelde, Jan Melkebeek

Abstract:

In this work, an experimental technique is applied for the measurements of the vibrations and deformation of a test transformer core. Since the grid voltage contains some higher harmonics, in addition to a purely sinusoidal magnetisation of the core the presence of third harmonic is also studied. The vibrations of the transformer core for points as well as the surface scan of the leg show more deformation in the corners of the leg than the middle of the leg. The influence of the higher harmonic of the magnetisation on the core deformation is also more significant in the corners of the leg. The core deformation shape under a sinusoidal magnetisation with a higher harmonic is more wavy and fluctuating than that under a purely sinusoidal magnetisation.

Keywords: Vibrations and noise, transformer, vibration measurements, laser vibrometer, higher harmonic.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1337255

References:

[1] L. Vandevelde and J. Melkebeek Magnetic forces and magnetostriction in electrical machines and transformer cores, IEEE Trans. Magn. , 2003, vol. 39, no. 3, pp. 1617-1621
[2] A. Belahcen, Vibrations of rotating electrical machines due to magnetomechanical coupling and magnetostriction, IEEE Trans. Magn., 2006, vol. 42, pp. 971-974
[3] B. Weiser, H. Pf¨utzner and J. Anger, Relevance of Magnetostriction and Forces for the Generation of Audible Noise of Transformer Cores, IEEE Trans. Magn., 2000, vol. 36, no. 5, pp. 3759-3777
[4] A. Belahcen, K. Fonteyn, R. Kouhia, P. Rasilo, and A. Arkkio, Magnetomechanical coupled fe simulations of rotating electrical machines, COMPEL: International Journal for Computation and Mathematics in Electrical and Electronics Engineering, 2013, vol. 32, no. 5, pp. 14841498
[5] S. Gorji Ghalamestani, L. Vandevelde, J. Dirckx, P. Guillaum and J. Melkebeek, Magnetostrictive Deformation of a Transformer: a Comparison Between Calculation and Measurement, Accepted for publication in International Journal of Applied Electromagnetics & Mechanics
[6] N. S. specialist group N-E EMC & Harmonics, Power quality in European electricity supply networks-2nd edition, Union of the Electricity Industry EURELECTRIC, 2003
[7] S. Gorji Ghalamestani, L. Vandevelde, J. Dirckx and J. Melkebeek, Magnetostriction and the Influence of Higher Harmonics in the Magnetic Field, IEEE Trans. Magn., 2012, vol. 48, no. 11, pp. 3981-3984
[8] T. Hilgert, L. Vandevelde and J. Melkebeek, J. Appl. Phys., 2005, vol. 97, 10E101