Leelachariyakul, Banyat

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Leelachariyakul, Banyat
Alternative Name
Leelachariyakul, B.
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Email
banyat.le@kmitl.ac.th

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    The performance of a high frequency current transducer for partial discharge measurement under testing with a power frequency converter
    (2018-11-01)
    Leelachariyakul, Banyat
    ;
    Paophan, Busayapol
    ;
    Chaisiri, Punyavee
    ;
    Yutthagowith, Peerawut
    In this paper, the performance of a high-frequency current transducer (HFCT) for partial discharge measurement under testing with a power frequency converter is presented. The performances of the HFCT in comparison with the conventional partial discharge detection system (Omicron MPD600) were investigated terms of the ability to classify partial discharges and the background noises in the system from PD test cells in case of corona discharge, internal discharge and surface discharge. It's found that the presented system provides the better performances (in terms of the background noise) than conventional PD detection system and it can also be used to distinguish type of partial discharges. In addition, the presented system has been used for the real partial test on the PD test cells successfully. The HFCT for PD detection is an attractive choice in the PD tests of high-voltage equipment.
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    Development of a resonant frequency converter for partial discharge tests on potential transformers
    (2018-06-08)
    Yutthagowith, P.
    ;
    Prombud, T.
    ;
    Leelachariyakul, B.
    In this paper, the development of a partial discharge testing system based on a resonant frequency converter for potential transformers (PTs) is presented. The system is composed of a power low-voltage variable frequency converter connected with a frequency tuning circuit, a high-voltage testing transformer, and a conventional partial discharge detection system. The performances of the developed system in comparison with the conventional PWM frequency converter were investigated terms of the quality of the output voltage from the high-voltage testing transformer, i.e. the voltage difference (peak voltage/square root of 2 and rms voltage), total harmonic distortion of the output high voltages (THDv), and background noises in the partial discharge test. It is found that the developed system based on the resonant frequency converter provides the better performances (in terms of the output voltage from a testing transformer, the voltage difference, THDv, and background noise) than those of the PWM converter. The voltage difference and THDv are lower than 2%, and the background noise is less than 2.5 pC. In addition, the developed system has been used for the real partial test on a potential transformer in the distribution system successfully. The developed inverter is an attractive choice in the PD tests of potential transformers.
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    A rogowski coil with an active integrator for measurement of long duration impulse currents
    (2014-12-03)
    Yutthagowith, Peerawut
    ;
    Leelachariyakul, Banyat
    This paper presents design and construction of an impulse current measuring system based on a Rogowski coil with a non-inverting active integrator. The developed measuring system was designed for measurement of millisecond impulse currents. The comparative measurements of the same Rogowski coil with various integrators and of a non-inductive shunt resistor were carried out in an HV Laboratory. In this paper, the performance of the developed integrator with the same Rogowski coil was compared with that of other integrators (a conventional RC integrator, a compensated RC integrator and an inverting active integrator). From the experimental results, the proposed active integrator provides promising performance comparable to that of the non-inductive shunt resistor. This accomplishment will be useful in measurement of long duration impulse currents and also evaluation test of surge arrester.
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    The Development of An Adjustable Low-pass Filter for A Partial Discharge Detection System under Testing with The Power Frequency Converter
    (2019-09-01)
    Leelachariyakul, Banyat
    ;
    Yutthagowith, Peerawut
    In this paper presents the partial discharge detection system based on the power frequency converter as a low-voltage source and an adjustable low-pass filter which is constructed from variable inductor and fixed capacitor. The inductance is able to vary in the range of 8.69 mH to 18.82 mH. This adjustable low-pass filter circuit in partial discharge detection system is able to filter the undesired harmonic voltage and also reduce background noise. It is compatible with partial discharge detection system for high voltage equipment. The background noise of the commercial partial discharge detection system and the total harmonic distortion (THDv) of the testing voltage are improved. The results show that this low-pass filter that had been designed and constructed is capable for filtering the noise from a power frequency converter in the PD test and the undesired harmonic voltage sufficiently. The quality of the testing high voltage is good and sufficient for testing equipment such as potential transformers. Thus, application of this particular adjustable low-pass filter with variable cut-off frequency to the power frequency converter is a promising approach for generation of an AC sinusoidal voltage for the partial discharge detection system.