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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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Application of a single-phase five-level converter for highvoltage and partial discharge tests on potential transformers
(2021-01-01)
Yomkaew, Noppadol
;
Yutthagowith, Peerawut
;
Prombud, Tongpian
This paper presents an application of a single-phase five-level converter as a low-voltage source fed to a high-voltage (HV) transformer for HV and partial discharge (PD) tests on potential transformers with a voltage rating of 33 kV. The converter was constructed with two H-bridge sets of insulated gate bipolar transistor (IGBT) switches, and the sinusoidal pulse width modulation (SPWM) technique was utilized to control the converter. Also, an additional filter was implemented in the testing system to mitigate the background noise level in the HV testing system, and the suitable modulation index and carrier frequency were analyzed. To evaluate the performance of the developed testing system, the difference in the voltage, the total harmonic distortion, and the background noise in the PD tests were examined by simulations and experiments without and with a test object. From the simulation and experimental results, it was found that (i) the difference in the voltage is below 1%, (ii) the total harmonic distortion is below 1%, and (iii) the background noise is below 2 pC. The performances of the proposed converter in terms of output voltage distortion and switching interference are superior to those of the conventional three-level converter. This makes the developed system very attractive for use in practical HV and PD tests.
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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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Analysis of frequency converters for PD test
(2017-10-27)
Kitcharoen, Phattarin
;
Kunakorn, Anantawat
;
Yutthagowith, Peerawut
;
Potivejkul, Siriwat
This paper presents the analysis of an AC-AC converter used in partial discharge test. In this paper, the analysis of the frequency converter is separated into two parts. Firstly, the converter models are simulated by a circuit simulation program for comparing noise signals generated by the 2-level SFC and 5-level SFC. The frequency of the converter was set to be 200 Hz. With the help of the simulator, the approach for noise mitigation with filter application is designed and applied to the PD test system. In the second part, the developed static frequency converters are used in the partial discharge tests for confirming the simulation results. From all simulated and experimental results, it can be concluded that the 5-level SFC has high efficiency, low generated noise signal, and also very attractive for using in partial discharge test.

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