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Author: search.filters.author.Marukatat, NattaponHas files: No

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    Design and Construction of Tesla Transformer for testing on Suspension Type Insulator Class 52-3
    (2024-01-01)
    Paophan, Busayapol
    ;
    Marukatat, Nattapon
    ;
    Yutthagowith, Peerawut
    This paper presents the design and construction of a Tesla transformer used for an electrical flashover test of a suspension insulator. The testing waveform of the Tesla transformer is contained based on the resonance circuit. Tesla transformer circuit uses inductive coupling of a primary voltage inductor of 3.75 μH, primary voltage capacitor of 109.4 nF, secondary inductor of 8.106 mH, and high voltage capacitor in the form of toroid and suspension insulator. The simulation and experimental results of the Tesla transformer present the appropriateness of the main design parameters. The rated voltage and frequency of the developed are 250 kV and 200 kHz, respectively. The insulators under test are suspension type ANSI 52-3. It is found that the Tesla transformer can generate high voltage with a frequency of about 200 kHz (160 to 220 kHz) and make flashovers on the insulators according to the ANSI C29.1 standard.
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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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    Design and Construction of a Combination Wave Generator
    (2019-09-01)
    Marukatat, Nattapon
    ;
    Tuethong, Piyapon
    ;
    Yutthagowith, Peerawut
    This paper presents design and construction of a combination wave generator with rating of 10 kV, 5kA. According to IEC 61000-4-5, the generator applies a lightning impulse voltage of 1.2/50-μs waveform in the condition of open circuit, and lightning impulse current of 8/20-μs waveform in the condition of short circuit. The generator can be used for testing surge suppression devices in the low-voltage system. The impulse generated by the generator can be controlled to impose on the DC and AC system low voltages. In the tests, the generator can apply the impulse on the system low voltage with selecting phase angle of 90o and 270o. From the test results, it can be confirmed that the generator can be used for the test efficiently.
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    Design and construction of a quad-pole coupling device for partial discharge tests
    (2017-11-03)
    Marukatat, Nattapon
    ;
    Kunakorn, Anantawat
    ;
    Yutthagowith, Peerawut
    This paper presents design and construction of a quad-pole coupling device which is used for measurement of PD signal and AC voltage as the conventional partial discharge testing according to IEC 60270[1]. The developed coupling device is capable to measure AC voltage at frequencies of 50 Hz and 200 Hz. Lower limit and Upper limit frequencies of the developed coupling device are 30 kHz and 20 MHz, respectively. The remarkable feature of the developed coupling device has the accuracy in PD signal measuring and the ability in eliminating noise signal such as unwanted AC signal at PD measuring point and interference signal. Therefore, in the design procedure based on OrCAD computer program, two main parts being the AC signal measuring part and the PD signal measuring part are considered. In the AC signal measuring part, the proper impedance was chosen to achieve appropriate voltage divide ratio and accuracy in PD signal measuring. In the coupling device, voltage surge protective device was installed to protect the PD measuring part. In PD signal measuring part, the value of the components in PD signal measuring circuit must be chosen properly to achieve the determined upper and lower limit frequencies and consider the value of the matching resistance. In this part, noise signal elimination must be considered to gain less effect to PD signal, otherwise the PD signal waveform will distort. From this intensive study, the coupling device circuits were designed and constructed and then, they were tested at 50 Hz and 200 Hz AC Voltage supply. The results of the developed coupling device are compared to that of the reference coupling device in the high voltage laboratory of King Mongkut's Institute of Technology Ladkrabang. The developed coupling device can be used in conventional PD testing according to IEC 60270. The comparisons of the simulated and experimental results show that the performance of the developed coupling devices as same as the reference coupling device.
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    Design and analysis of coupling device in partial discharge detection
    (2017-10-27)
    Marukatat, Nattapon
    ;
    Kunakorn, Anantawat
    ;
    Yutthagowith, Peerawut
    ;
    Pumyoy, Suparat
    This paper presents design and analysis of a coupling device which is used for measurement of PD signal and AC voltage as the conventional partial discharge testing according to IEC 60270. The remarkable feature of the developed coupling device is the accuracy in PD signal measuring and the ability in eliminating noise signal Therefore, In the AC signal measuring part, the proper impedance was chosen to achieve appropriate voltage divide ratio and accuracy in PD signal measuring. In PD signal measuring part, the value of the components must be chosen properly to achieve the determined Upper and Lower limit frequency. In this part, noise signal elimination must be considered to gain less effect to PD signal, otherwise the PD signal waveform will distort. From intensive study, three different coupling device circuits were designed and constructed. The circuit of the first and second coupling device are collected from literatures. It is found that the PD signal was interfered by the testing AC voltage signal. Therefore, the last one was developed to overcome this problem. The last developed coupling device has the lower and the upper cut off frequencies of 30 kHz and 20 MHz, respectively. The results of the three coupling devices are compared to that of the commercial coupling device in the HV laboratory of King Mongkut's Institute of Technology Ladkrabang. The developed coupling devices can be used in conventional PD testing according to IEC 60270. The comparisons of the simulated and experimental results show that the performance of the developed coupling devices as same as the commercial one.