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Author: search.filters.author.Mongkolsatitpong, S.Has files: No

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    The Application of Polarization and Depolarization Current on the Large Turbo-generators
    (2022-01-01)
    Jeenmuang, S.
    ;
    Pannil, P.
    ;
    Mongkolsatitpong, S.
    ;
    Trakuldit, S.
    ;
    Wuti, V.
    This paper represents the application of the polarization and depolarization current (PDC) measurement of the stator winding insulation of two large turbo-generators, which have the same rate of 50.8 MVA, and 11.5 kV. The PDC measurements were conducted on the stator winding insulation of both generators by using two different test circuits i.e., (individual) phase-to-ground insulation and interphase insulation circuits. Then, the PDC results of the two investigated generators were compared. To evaluate the phase-to-ground insulation condition of the stator winding insulation of both generators, the conventional dielectric parameters in the time domain, such as polarization index and insulation resistance, were also studied. Moreover, the PDC results in the time domain were converted into the dielectric dissipation factor in the frequency domain to allow the analyzing the phase-to-ground insulation of the stator winding of the generators. The PDC results of the phase-to-ground insulation circuits of both investigated generators illustrate the bent shape of PDC results which were affected by the influence of the stress control coating resulting in a high value of the Polarization index. Besides, the PDC results of the interphase insulation circuits of the first investigated generator illustrate the polarity reversal (or Anomalous current) of both PDC, while the second investigated generator illustrates the non-polarity reversal of both PDC. The polarity reversal of the PDC results of the interphase insulation was due to the dielectric loss of the interphase insulation is a lower influence when compared with that of phase-to-ground insulation.
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    The Effects of Coupling and Grounding on the Partial Discharge Pulse Propagation in the Underground Cable
    (2022-01-01)
    Rojanasunan, W.
    ;
    Chancharoensook, P.
    ;
    Jeenmuang, S.
    ;
    Mongkolsatitpong, S.
    ;
    Pattanadech, N.
    When a Partial Discharge (PD) pulse propagates through a cross-bonded (CB) power cable system, such pulse undergoes attenuation and dispersion along a cable. Moreover, the coupling effect occurs when a PD pulse propagates in HV cable joints and CB link lines. This paper aims to study the effects of coupling phenomena and groundings on the PD pulse propagation. The experiments were divided into 3 parts: the experiment for attenuation in the conductor and ground wire, the experiment for coupling effect, and the experiment for different grounding configuration. The experimental setups used a 30 m length of new 33 kV XLPE insulated cable. PD pulses was obtained from a PD calibrator, and the pulses are detected by Radio Frequency Current Transformer at various positions. The knowledge gained from this research should be useful for a deep understanding of pulse propagation and PD source localization in CB power cable systems.
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    A locating diagnosis of partial discharge on cross-bonding ground system
    (2021-05-19)
    Inwanna, W.
    ;
    Mongkolsatitpong, S.
    ;
    Chancharoensook, P.
    ;
    Pattanadech, N.
    At the present, Thailand has turned the attention to Underground Cable (UC) systems and trends to use it more to safety, stability and reliability of electrical system. However, one problem that can affect to this electrical system is the Partial Discharge (PD) problem. Most of PD problems are caused by incomplete installation, maintenance reason and insulation degradation on the weakest part, especially cable joint. This paper proposes a method of analysis to locate the PD source in UC systems with Cross Bonding (CB) focus on cable joints. This work has carried out in laboratory on CB system model using 50ohm R58 coaxial cable instead of underground cable. The PD detection technique according to IEEE 400.3 standard with a RFCT sensor to refer the appropriate signal. This work uses a PD diagnostic device that can filter noise from the PD groups and separate groups of PD for greater analysis accuracy. To determine which cable joint is PD source and to be able to fix it on the spot. The PD signal analysis are performed by using time of arrival method considered together with the characteristics and the polarity of the PD pulse.