Yutthagowith, Peerawut

Preferred name

Alternative Name

Yutthagowith, P.

Yutthagowith, Pearawut

Main Affiliation

School of Engineering

peerawut.yu@kmitl.ac.th

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A partial discharge testing system based on a 5-level converter with different control signals
(2018-11-01)
Yomkaew, N.
;
Marukatat, N.
;
Yutthagowith, P.
In this paper, analyses of a partial discharge (PD) testing systems using a voltage source from a 5-level converter with different control signals are presented. The low voltage source with 200 Hz of the test system is generated using the 5-level converter. The converter connected to a high voltage transformer, a partial discharge detection. The LC-filter type is set for the test system. The efficiency of voltage source from the 5-level converter with different control signal topologies, i.e. 5-level square wave, 5-level quasi-square wave, and 5-level sinusoidal pulse width modulation (SPWM) with modulation index (m<inf>a</inf>) of 1.0. The effect of the topologies to partial discharge test system is presented and compared in cases of the voltage difference, total harmonic distortion (THD<inf>v</inf>) of the output voltage, and the background noises in the partial discharge testing system with no-load and load test with a potential transformer (PT). It is found that the 5-level sinusoidal pulse width modulation (SPWM) with modulation index 1.0 provides the best performance in cases of the voltage difference and THD<inf>v</inf> of below 5%, and the background noise of below 2.5 pC.
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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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Development of a low-pass filter for partial discharge testing system with the power frequency converter
(2018-11-01)
Prombud, T.
;
Kitcharoen, P.
;
Yutthagowith, P.
The development of a low-pass filter for partial discharge test system that based on a power frequency converter is presented in this paper. The PD testing system is composed a 200-Hz power frequency converter and the designed filter connected with a high-voltage test transformer and a conventional partial discharge detection system. It is found that the power frequency converter acting as the low-voltage source always provides the high noise level with effecting to the background noise occur in the partial discharge test. Sometimes noise level is higher than the acceptable level of the PD tests in some high-voltage equipment such as potential transformers, distribution transformer, and so on. In this paper, the performances of the filters with different designs are studied and compared the result in terms of the output voltage difference (RMS, voltage , and ,peak,voltage 2), total harmonic distortion of the output high voltages value (THD<inf>v</inf>), and value of background noises as occur in the partial discharge test. The low-voltage source based on uni-polar pulse width modulation (PWM) topology was employed in the PD testing system. From the experimental results, the designed filter shows the promising performances with low levels of the background noise, THD<inf>v</inf>, and voltage difference. The experimental results show that the background noise is lower than 2.0 pC, the voltage difference and THD<inf>v</inf> are less than 5%. In addition, the designed filter has been tested in the partial test of a real potential transformer successfully.
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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.

Yutthagowith, Peerawut

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