研究者詳細 - 小迫　雅裕

論文 - 小迫　雅裕

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Partial Discharge Measurement and Its High Frequency Characteristics in Cast Resin Transformer 査読有り国際誌

T.Fujimura, S.Masuda, M.Kozako, M.Hikita, T.Umemura, K.Iida, Y.Nakamura, T.Nakamae, T.Maeda, M.Higashiyama

Proceedings of the 21st International Symposium on High Voltage Engineering 1 653 - 661 2019年11月

Identification Of Partial Discharge Source In Power Apparatus In Practical Substation Utilizing Artificial Neural Network 査読有り国際誌

Y.Kakimoto, P.Nuraida, H.Yoshikawa, T.Fujimura, M.Kozako, M.Hikita, O.Eda, Y.Shiina, M.Otsuka, H.Kaneko

Proceedings of the 21st International Symposium on High Voltage Engineering 1 643 - 652 2019年11月

Discharge characteristics and mechanisms under the medium vacuum region in a vacuum interrupter 査読有り

Nakano Y., Masuda S., Kozako M., Hikita M., Tanaka T., Kobayashi M.

IEEJ Transactions on Electrical and Electronic Engineering 14 ( 11 ) e1 - e6 2019年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. This article deals with discharge characteristics and mechanisms in the medium vacuum range of 1–1000 Pa in a vacuum interrupter (VI), which consists of complex electrode configuration with an electrode of floating potential and an insulator. Gas leakage was simulated by enclosing air or SF6 gas. From a measured discharge current and a shield potential, the discharge characteristics inside the VI at each pressure were discussed. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

DOI： 10.1002/tee.23019

Scopus

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Investigation for influence of space charge accumulation in motor winding coating material on partial discharge inception voltage 査読有り

T.Narita, M.Mima, H.Miyake, Y.Tanaka, M.Kozako, M.Hikita

2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena(CEIDP) ( 6D-2 ) 718 - 721 2019年10月

Estimation of Electron Trap in Hydrocarbon-Based Thermosetting Resin/Fullerene Composite by Computational Science 査読有り

K.Ohzuno, K.Abe, M.Kozako, M.Hikita, N.Kamei

2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena(CEIDP) ( 8-2 ) 839 - 842 2019年10月

Partial Discharge Inception Voltage Characteristics for Nano-micro Composites under Impulse Voltage in SF6 Gas 査読有り

K.Abe, K.Ohzuno, M.Kozako, M.Hikita, H.Mitsudome, H,Yanase, K.Okamoto

2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena(CEIDP) ( 6D-7 ) 738 - 741 2019年10月

DetectingVacuum Degree Condition of Vacuum Interrupter by Partial Discharge Measurement 査読有り

A.S.Habibie, M.Hikita, M.Kozako, Y. Nakano, Suwarno, U. Khayam, M.Kobayashi

5th International Conference on Electric Power Equipment -Switching Technology(ICEPE-ST 2019) ( C-4-1 ) 193 - 196 2019年10月

Niメッキ接合を用いたSiCパワーモジュールの熱抵抗と過渡熱解析査読有り

今給黎明大, 小迫雅裕, 匹田政幸, 巽宏平, 稲垣雅一, 飯塚智徳, 佐藤信明, 清水孝司, 上田和敏, 杉浦和彦, 鶴田和弘, 戸田敬二

電気学会論文誌D 139 ( 10 ) 838 - 846 2019年10月

Estimation method of degraded vacuum in vacuum interrupter based on partial discharge measurement 査読有り

Nakano Y., Kozako M., Hikita M., Tanaka T., Kobayashi M.

IEEE Transactions on Dielectrics and Electrical Insulation 26 ( 5 ) 1520 - 1526 2019年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 1994-2012 IEEE. Loss of vacuum in vacuum interrupter (VI) is becoming an interesting theme for VI used in medium voltage range beyond its lifetime of typically 20-30 years. The early detection of abnormality in the vacuum insulated equipment is important not only for the operating vacuum circuit breakers (VCBs) in medium voltage but also for the development of higher voltage VCBs, such as cubicle type gas insulated switchgear (C-GIS) with compressed gas and/or insulation gas. The purpose of present study is to estimate the vacuum degree in VI by measuring partial discharges (PDs) occurring in medium vacuum range for more than 1 Pa. As a leakage gas, atmospheric air and SF6 gas were sealed into the VI with close-state, whose pressure was regulated through vacuum pump systems, which corresponds to the left region of its PD inception voltage (PDIV) curve. From PD current waveforms measured by detecting resistor connected to plane electrode outside the VI, PD charges, occurrence frequency and phase characteristics of PDs for each applied AC voltage and internal vacuum pressure were determined. It was concluded that, by statistical processing using PD parameters and histogram, a number of occurrence of PD and PD charges would be dominant parameter for determination of the internal pressure of VI with the leakage gas of air.

DOI： 10.1109/TDEI.2019.008142

Scopus

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Partial Discharge Waveform Identification using Image with Convolutional Neural Network 査読有り国際誌

Puspitasari N., Khayam U., Suwarno , Kakimoto Y., Yoshikawa H., Kozako M., Hikita M.

2019 54th International Universities Power Engineering Conference, UPEC 2019 - Proceedings 2019年09月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Romania Bucharest 2019年09月03日 - 2019年09月06日

© 2019 IEEE. The use of Neural Network as a tool for Partial Discharge (PD) Identification has been used since the 1990s, where Backpropagation Neural Network (BPNN) with input in the form of data values was the most widely used method. However, for the past five years, Convolutional Neural Network (CNN) has been used to identify Partial Discharge with input in the form of images. Pattern Recognition of Partial Discharge Image Based on One-dimensional Convolutional Neural reported by Wan et al. in CMD 2018 was using images of 5 cycles repeated waveform pattern images as input. In our research, we used two-dimensional images of time domain single PD waveform obtained from experiments using three sensors (High-Frequency Current Transformer (HFCT), Surface Current Sensor (SCS), and Transient Earth Voltage (TEV) sensor) for input to CNN. The images were extracted using Gaussian Filter on the Convolutional layer, then searched the maximum value for each group of pixels to make computing easier on the Pooling Layer, and finally identified on the Fully Connected Layer. The purpose of this study is to develop a PD diagnostic technique that could simplify the identification of PD sources by using a signal waveform image for identification. The experimental results show that the proposed method has sufficient accuracy in identifying Partial Discharge, and it may be possible to identify Partial Discharge in HV voltage equipment by comparing field data.

DOI： 10.1109/UPEC.2019.8893577

Scopus

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Construction of Novel Online Partial Discharge Monitoring System in Model Power Apparatus using Power Line Communication 査読有り

H.Yoshikawa, S.Masuda, Y.Kakimoto, N.Puspitasari, Y.Nakano, M.Kozako, M.Hikita, H.Sato, H.Tagashira, K.Ishida

The 21th International Symposium on High Voltage Engineering(ISH2019) ( 853 ) 1 - 8 2019年08月

Numerical Simulation For Creepage Discharge In Oil/Pressboard Composite Insulation System With Multiple Pressboards 査読有り

S.Yoshida, T.Yamada, Y.Nakano, M.Kozako, M.Hikita

The 21th International Symposium on High Voltage Engineering(ISH2019) ( 1096 ) 2019年08月

Diagnostics For Vacuum Degree Of Vacuum Interrupter Based On Partial Discharge Mechanisms Under Medium Vacuum Level 査読有り

Y.Nakano, M.Kozako, M.Hikita, T,Tanaka, M.Kobayashi

The 21th International Symposium on High Voltage Engineering(ISH2019) ( 887 ) 1 - 11 2019年08月

Propagation Characteristics of Partial Discharge Radiated Electromagnetic Waves for Insulation Diagnosis of Oil-Filled Bushing 査読有り

T.Fujimura, S.Masuda, M.Kozako, M.Hikita, T.Yamamoto, S.Okabe, M.Nakahata

The 21th International Symposium on High Voltage Engineering(ISH2019) ( 881 ) 1 - 10 2019年08月

Partial Discharge Measurement and Its High Frequency Characteristics in Cast Resin Transformer 査読有り

T.Fujimura, S.Masuda, M.Kozako, M.Hikita, T.Umemura, K.Iida, Y.Nakamura, T.Nakamae, T.Maeda, M.Higashiyama

The 21th International Symposium on High Voltage Engineering(ISH2019) ( 872 ) 1 - 8 2019年08月

Identification Of Partial Discharge Source In Power Apparatus In Practical Substation Utilizing Artificial Neural Network 査読有り

Y.Kakimoto, P.Nuraida, H.Yoshikawa, T.Fujimura, M.Kozako, M.Hikita, O.Eda, Y.Shiina, M.Otsuka, H.Kaneko

The 21th International Symposium on High Voltage Engineering(ISH2019) ( 869 ) 1 - 11 2019年08月

Effect of lightning impulse prestress on AC partial discharge characteristics in cast resin transformer 査読有り

Maruyama H., Matsuo K., Kozako M., Hikita M., Iida K., Umemura T., Nakamura Y., Nakamae T., Maeda T., Higashiyama M.

Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) 208 ( 1-2 ) 10 - 16 2019年07月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 Wiley Periodicals, Inc. It is crucial for cast resin transformer to detect void and delamination existing in the cast resin because these defects reduce insulation performance of cast resin equipment. Furthermore, defects are likely to be mixed in cast resin because of several surface boundaries between resin and conductor. It is considered that detecting partial discharge (PD) is effective to diagnose equipment of power equipment. However, it is reported that withstand lightning impulse voltage test may give influence on AC partial discharge test, especially partial discharge inception voltage. This paper deals with accumulated charge in a void under AC voltage to investigate the effect of the impulse voltage prestress on subsequent AC PD characteristics in cast resin transformer. AC PD characteristics were compared before and after impulse application. In addition, recovery of PD characteristics was measured to investigate charge decay. As a result, the mechanism of prestress effect is revealed and surface charge density is estimated quantitatively in cast resin transformer.

DOI： 10.1002/eej.23177

Scopus

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Discharge characteristics with impulse voltage application in ester oil/pressboard composite 査読有り

T.Yamada, Y.Nakano, M.Kozako, M.Hikita, S.Yoshida, S.Kainaga, M.Yoshimura, K.Suga

IEEE International Conference on Dielectric Liquids (ICDL2019) ( 1198 ) 2019年06月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Italy Roma 2019年06月23日 - 2019年06月27日

© 2019 IEEE. Partial discharge characteristics as well as breakdown phenomena in a power transformer insulation, i.e. oil and paper insulation, has to be clarified for miniaturization of the apparatus. In recent years, environmental-friendly transformers using ester oil, which shows excellent biodegradability, receive much attention due to the worldwide growing environmental awareness. Considering this, researches on fundamental characteristics of discharge phenomena within the ester oil are required. Although various papers on discharge characteristics in the ester oil have been published by many researchers, there are still few reports on these researches using ester oil and pressboard (PB) composite insulation system. In this paper, the discharge inception field and starting point in the ester oil and PB composite insulation configuration are investigated and the results are compared with those in the mineral oil to discuss the detailed discharge mechanisms.

DOI： 10.1109/ICDL.2019.8796623

Scopus

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Temperature Dependence of RPDIV of Motorette Sample with Varnish Treatment 査読有り

Y.Nishigaki, T.Matsuzoe , T.Kubo, Y.Nakano, M.Kozako, M.Hikita, T.Nakamura, J.Sun, A.Izumi, T.Sakurai K.Karasawa, K.Nojima

2019 Electrical Insulation Conference (EIC) ( P-1-5 ) 18 - 21 2019年06月

Dielectric and Insulation Propertiesof Polyimide-based Boehmite Nanocomposite Material 査読有り

T.Matsuzoe, N.Kita, Y.Nishigaki,T. Abe, T.Kubo, Y.Nakano, M.Kozako, M.Hikita, N.Fujimoto, N.Hayashizaka, S.Fujimoto, T.Kato

2019 Electrical Insulation Conference (EIC) ( P-3-1 ) 83 - 86 2019年06月

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