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    Designing HV Reactor With Multiple Air Gap Structure Based on Fringing Flux Factor
    (2024-01-01)
    Yutthagowith, Peerawut
    ;
    Raxsa, Jedsada
    ;
    Leelachariyakul, Banyat
    ;
    Khumpho, Juthathip
    This paper introduces an experimental approach to determining the fringing flux factor (F), representing the leakage flux within the air gap of the magnetic core, for the design of high-voltage (HV) reactors. The formula for determining F was developed from the AC excitation experimental data using curve-fitting techniques on the proposed reactor's reduced-scale model, which features a CC shaped magnetic core with six air gaps. The significant configuration of the model includes an iron core and coil windings. The test conditions for the reduced-scale model are based on the number of turns in the winding, 85 and 300 turns for each coil winding and the length of the air gap, 2 mm. and 5 mm. for each gap. Based on experiments with the reduced-scale model, the developed formula for F demonstrates effective results, exhibiting an absolute error lower than 20 %. This F formula provides a promising guideline for designing HV reactors, with a lower absolute error value.
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    Accurate Circuit Parameter Determination of a Resonant Power Frequency Converter for High-Voltage and Partial Discharge Tests
    (2022-08-01)
    Leelachariyakul, Banyat
    ;
    Yutthagowith, Peerawut
    For high-voltage (HV) and partial discharge (PD) tests on high-voltage equipment, a resonant power frequency converter has recently been developed. A single-phase power frequency converter with a resonant tuning and filter circuit and an HV testing transformer comprise the developed system. A difficulty in the tuning and filter circuit design is the unknown testing system circuit parameters, including unknown parasitic inductance, capacitance, and internal resistance. In this paper, a system with a voltage rating of 75 kV<inf>rms</inf>, apparent power of 40 kVA, and an operating frequency from 50 Hz to 200 Hz is considered for determination of the equivalent circuit parameters. From the determined circuit parameters, the appropriate resonant tuning and filter circuit was designed effectively. The transfer functions of the input and output testing voltages, along with the transfer impedance of the input voltage and signal voltage of the PD measuring port, were analyzed. The system design was verified by experiments with a voltage transformer. The gain of the transfer impedance was about 15 and 4 at the testing frequencies of 50 Hz and 200 Hz, respectively. With the proper design, it is possible to generate an output voltage waveform that is almost entirely sinusoidal and has a background noise level of under 1 pC. According to the experimental results, the system design of the resonant converter and the method for determining the equivalent circuit are very helpful for the HV and PD tests of voltage transformers in actual practice.
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    Resonant power frequency converter and application in high-voltage and partial discharge test of a voltage transformer
    (2021-04-01)
    Leelachariyakul, Banyat
    ;
    Yutthagowith, Peerawut
    This paper presents application of a resonant power frequency converter for high-voltage (HV) and partial discharge (PD) test of a voltage transformer. The rating voltage, power, and frequency of the system are 70 kV<inf>rms</inf>, 40 kVA, and 200 Hz, respectively. The testing system utilized the converter feeding to an HV testing transformer connected to a conventional partial discharge detection system. The converter system comprising a rectifier and insulated-gate bipolar (IGBT) switches with the H-bridge configuration was applied as a low-voltage source instead of a conventional motor-generator test set which requires large space and high cost. The requirements of the test according to the standards are quality of the test voltage and the background noise level. The required voltage must have the different voltage (DV) and total harmonic distortion (THD<inf>v</inf> ) in the acceptable values of less than 5%. The DV is defined as the difference of the root mean square and peak voltages in percent. The required background noise level must be lower than 2.5 pC. Simulations and experiments were performed for verification of the developed system performance in comparison with those of the previously developed system based on the pulse width modulation converter. It is found that the developed system can provide the testing voltage with the DV and the THD<inf>v</inf> of lower than 1% and the background noise level of lower than 1 pC. Considering this achievement of promising performance, the developed system is an attractive choice for the HV and PD testing of voltage transformers in real practice.
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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.
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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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    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.