Characterizing the Diverter Switch of a Load Tap Changer in a Transformer using Wavelet and Modal Analysis Articles uri icon

publication date

  • October 2010

start page

  • 3011

end page

  • 3017

issue

  • 10

volume

  • 32

international standard serial number (ISSN)

  • 0141-0296

electronic international standard serial number (EISSN)

  • 1873-7323

abstract

  • Vibration analysis is a promising technique in the diagnosis of the OLTC in power transformers. In this paper the vibration modes of the natural frequencies of the diverter switch cylinder, the
    head, and the disc of the moving contact of an OLTC in good condition
    are obtained by modal analysis of the numerical model. The obtained
    frequencies are identified with real vibration signal analysis recorded
    with a mono-axial piezoelectric accelerometer on a vertical axis. The
    actual vibration signals were processed using a Hilbert transform and a
    discrete wavelet transform. This article proposes using the natural
    frequencies of the modes of vibration calculated for the numerical model
    of 3 OLCT elements as the pattern for identification of the frequencies
    generated in the analysis of the experimental vibration signal.The
    diverter switch cylinder, the head, and the disc of the moving contact
    of an OLTC were designed in commercial software SolidWorks™. Natural
    frequencies were analyzed using a numerical model with commercial
    software of the finite element method (MEF) Algor™ with 6 degrees of
    freedom (DOF) at each node.