Yutthagowith, Peerawut

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Yutthagowith, Peerawut
Alternative Name
Yutthagowith, P.
Yutthagowith, Pearawut
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Email
peerawut.yu@kmitl.ac.th

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    The Study of the Voltage Frequency Effects on Partial Discharge Characteristics
    (2023-01-01)
    Marukatat, Nattapon
    ;
    Mai-Eiam, Thanatorn
    ;
    Chaisiri, Punyavee
    ;
    Raxsa, Jedsada
    ;
    Nimsanong, Phethai
    In this paper, the partial discharge (PD) characteristics under the voltage at frequencies in the range of 20 Hz to 300 Hz are studied. Three main types of PD being corona, surface and internal discharges are simulated by an arrangement of electrodes in test cells. The effects of voltage frequency on the PD characteristics in terms of PD inception voltage (PDIV), PD extinction voltage (PDEV), and phase-resolved PD (PRPD) patterns have been reported from the experimental results. It is found that in the frequency range of 20 Hz to 300 Hz there is no frequency effect on the PD characteristics (PDIV, PDEV, and PRPD) found in cases of corona and surface discharge. However, the frequency effects are found in the case of the internal discharge representing the higher frequency increase the higher PDIV and PDEV are.
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    The Study of High Voltage AC Generation Using A Series Resonant Circuit
    (2023-01-01)
    Yutthagowith, Peerawut
    ;
    Raxsa, Jedsada
    ;
    Chaisiri, Punyavee
    ;
    Mai-Eiam, Thanatorn
    This paper studies an approach for high-voltage AC generation using a series resonant circuit in case of high capacitive load. The capacitor of 0.5 microfarad was a selected capacitive load in the test circuit. An HV inductor with 3 changing taps (53.2 H, 24.2 H, and 18.6 H) is used in the circuit for the generation of AC voltage with frequencies of about 30 Hz, 40 Hz, and 50 Hz, respectively. The square wave was generated by a variable frequency converter. The frequency of the square wave is adjusted to meet the resonant conditions associated with the inductance and capacitance of the circuit. It was found that using the test circuit the voltage gains of 30 can be achieved in the experiments. From the test results, it can confirm the possibility for further development of the test circuit used in the onsite test of MV and HV power cables in the near future.
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    Design of Narrowband and Wideband UHF Antennas for Partial Discharge Detection on High Voltage Equipment
    (2024-01-01)
    Yutthagowith, Peerawut
    ;
    Mai-Eiam, Thanatorn
    ;
    Nimsanong, Phethai
    This paper presents designs for ultra-high-frequency (UHF) electromagnetic sensors based on printed circuit board (PCB) antennas for partial discharge (PD) detection in gas-insulated substations (GIS) applications. The sensors were designed to meet the requirement of narrowband/wideband UHF measuring systems for the UHF PD detection in GIS. The PD signals in the physical characteristic of the high-frequency electromagnetic (EM) wave were detected using the designed UHF antennas, which include the inset-fed rectangular microstrip patch (IFRMP) antennas, known for their narrowband characteristics that offer high interference signal rejection to improve signal-to-noise ratio and the two arm Archimedean spiral (TAAS) antennas, recognized for their broadband frequency spectrum capability. Because UHF PD signals are typically detected using various field sensor designs, both IFRMP and TAAS antennas were designed for three different models under calculation and simulation using MATLAB to apply in different operating frequency bands within the UHF range of PD detection (300 MHz-3 GHz). The designed UHF antennas have very characteristics, i.e. portable, lightweight, and attractive for practical applications with a low fabrication cost. Additionally, they are more convenient to install on the insulating flange compared to some types of external antenna sensors. In terms of antenna performance, they exhibit parameters like return loss (parameter S11) less than -10 dB and voltage standing wave ratio (VSWR) less than 2 within a close range of the designed operating frequency. Using the designed antennas, the phase-resolved PD (PRPD) patterns, the statistical magnitudes and waveforms of detected UHF signal have been obtained from laboratory testing for the sensitivity verification to help users in the effective application of the UHF PD detection.
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    Determination of Dielectric Models Based on Effective Multi-Exponential Fittings
    (2023-06-01)
    Raxsa, Jedsada
    ;
    Nimsanong, Phethai
    ;
    Mai-Eiam, Thanatorn
    ;
    Yutthagowith, Peerawut
    In high-voltage (HV) transmission and distribution systems, HV apparatuses are subjected to electrical, thermal, and mechanical stresses that deteriorate the insulation performance. The polarization and depolarization current (PDC) measurement is an effective tool used for evaluating insulation performances. The depolarization current represented by the summation of the discharge currents with the different time constants can be utilized for the development of the dielectric model based on the extended Debye’s model (EDM). This paper presents effective techniques for determining the dielectric model. Iterative approaches with predetermination of the time constants and least squares methods (either linear ordinary or percentage ones) were utilized to fit the depolarization current in the form of multi-exponential functions. The fitting parameters determined by the proposed method with the linear ordinary least squares (OLLS) method and provided by commercial software agree very well only in the high current and beginning range. Application of the linear percentage least squares (PLLS) method shows better accuracy than that of the OLLS method, and the deviation from the measured one in the low current range and the late measuring time were reduced significantly. The fitted current by this proposed technique with the PLLS method agrees well with the measured current throughout the whole recording time, even in the low current and late time range. From the accurately fitted currents, the dielectric model and the dielectric loss factors can be determined precisely, and the insulation condition of HV equipment can be evaluated properly.