Faculty Profiles - KOZAKO Masahiro

Papers - KOZAKO Masahiro

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Effects of Nano-micro Composite and Shielding on Flashover Characteristics of Gas Insulated Switchgear Spacer Model in Different Lightning Impulse Application Methods Reviewed

Y.Inoue, M.Kozako, M.Hikita, H.Masui, H.Yanase, K.Okamoto

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena(CEIDP) ( 3A-5 ) 471 - 474 2021.12

A Study on Simultaneous Measurements of PD Light Emission and Charge in Resin Substrate Reviewed

K.Hamasuna, M.Kozako, M.Hikita

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena(CEIDP) ( 1C-15 ) 307 - 310 2021.12

Volume Effect on AC Dielectric Breakdown Strength of Ester Oil Compared with that of Mineral Oil Reviewed

K.Hamasuna, T.Matsuki, M.Kozako, M.Hikita, S.Yoshida, H.Hamada, T.Umemoto

The 22th International Symposium on High Voltage Engineering(ISH2021) ( 748 ) 2021.11

Research Trends in Online Partial Discharge Monitoring and Diagnosis Utilizing ICT in Electric Power Equipment Invited Reviewed

M.Hikita, M.Kozako

2021 3rd International Conference on High Voltage Engineering and Power Systems (ICHVEPS) ( PS1-3 ) 6 - 13 2021.10

モールド変圧器のインピーダンス周波数特性の解明と部分放電診断手法 Reviewed

柿本康朝, 小迫雅裕, 匹田政幸, 飯田和生, 梅村時博, 中村勇介, 中前哲夫, 前田照彦, 尾崎多文

電気学会論文誌A 141 ( 7 ) 420 - 427 2021.07

S6ガス中楔ギャップのインパルス部分放電開始特性に及ぼすエポキシ複合材へのナノフィラー添加の影響 Reviewed

井上好之, 大角浩太郎, 小迫雅裕, 匹田政幸, 増井秀好, 満留博, 柳瀬博雅, 岡本健次

電気学会論文誌A 141 ( 6 ) 391 - 397 2021.06

Effect of Different Types of Fullerene Addition on AC Dielectric Breakdown Strength of Epoxy Resin Reviewed

Ozuno K., Inoue Y., Kozako M., Hikita M., Igarashi T., Kaji H.

IEEE Transactions on Dielectrics and Electrical Insulation 28 ( 2 ) 625 - 629 2021.04

Language：English Publishing type：Research paper (scientific journal)

This research intends to investigate the applicability of fullerene as an electrically insulating filler. So far, the authors reported that the addition of a very small amount of fullerene C60 to epoxy resin (EP) improves the dielectric breakdown strength $(E_{\mathrm{b}})$ by about 30%. This report presents the study on the effect of four different types of fullerenes as fillers added to EP on the improvement of $E_{\mathrm{b}}$. Fullerenes used are mixtures of C60 and higher order one $\mathrm{C}_{70}$ with a different mixture rate, and the addition effect of sublimation-purified fullerene on $E_{\mathrm{b}}$ is also investigated. Experimental results reveal that samples added with sublimated fullerenes exhibit larger $E_{\mathrm{b}}$ than that of samples without sublimation. The sublimation-purified sample is also found to give almost no difference in $E_{\mathrm{b}}$ by the type or proportion of the added fullerenes $\mathrm{C}_{60}$ and $\mathrm{C}_{70}$. An attempt is also made to discuss the mechanism of the improvement effect on $E_{\mathrm{b}}$ of fullerene by evaluating the electronic state of epoxies with different fullerene fillers and curing agent using quantum chemical calculation. As a result, it is shown that the introduction of $\mathrm{C}_{60}$ and $\mathrm{C}_{70}$ into the EP considering the curing agent introduces electron traps of 0.64 and 0.72 eV, respectively. It is interpreted that the introduced electron traps suppress the electron avalanche, and consequently improves the breakdown strength.

DOI： 10.1109/TDEI.2021.009360

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85104652991&origin=inward

Characteristics of Creepage Discharge in Oil/Pressboard Composite Insulation Reviewed

Yoshida S., Kozako M., Hikita M.

IEEE Transactions on Dielectrics and Electrical Insulation 28 ( 2 ) 608 - 615 2021.04

Language：English Publishing type：Research paper (scientific journal)

This paper deals with partial discharge characteristics in oil/pressboard composite insulation system, which is used in oil-immersed power transformer. It is found that the discharge propagates in the same route on the pressboard surface as in the previous discharge every time under repeated impulse voltage application. We also revealed that the white trace remained along the path of discharge and affected the subsequent discharge progress because of being a weak point part on insulation. This study presents an investigation of the effect of the white trace on partial discharge inception voltage (PDIV) of the composite insulation system with high-speed optical observation and electrical measurements for the discharge propagation. The discharge propagation mechanism is also discussed with comparing the discharge progress characteristics before and after the white trace formation.

DOI： 10.1109/TDEI.2020.009313

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85104654786&origin=inward

2A15 Implementation of Inter-University Collaborative On-line Discussion Type Class Reviewed

SUEHIRO Junya, KOZAKO Masahiro, MIYAUCHI Hajime, NISHIDA Takashi, INOUE Masayoshi

Proceedings of Annual Conference of Japanese Society for Engineering Education ( Japanese Society for Engineering Education ) 2021 ( 0 ) 138 - 139 2021.01

九州支部における年次活動 Reviewed

小迫雅裕

電気学会誌 ( 一般社団法人電気学会 ) 140 ( 12 ) 795 - 795 2020.12

Authorship：Lead author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal)

<p>はじめに</p><p>九州支部は，福岡，佐賀，長崎，大分，熊本，宮崎，鹿児島，沖縄（沖縄支所設置）の8県から構成され，その会員数は2020年3月末で1,377名（名誉員1名，終身員87</p>

DOI： 10.1541/ieejjournal.140.795

CiNii Article

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/ieejjournal/140/12/140_795/_pdf

Construction and Experimental Verification of Novel Online Partial Discharge Monitoring System Using Power Line Communication Reviewed

Kakimoto Y., Yoshikawa H., Jogo T., Wakisaka T., Kozako M., Hikita M., Sato H., Tagashira H., Soeda M.

IEEE Transactions on Dielectrics and Electrical Insulation 27 ( 6 ) 2165 - 2171 2020.12

Language：English Publishing type：Research paper (scientific journal)

© 1994-2012 IEEE. In this research, we aim to construct a completely new partial discharge (PD) monitoring system that applies inexpensive power line communication (PLC). We have proposed a PD detection method and monitoring system (PDMS-PLC) on the basis of PLC signal transfer rare is affected by an error due to disturbance. An attempt is made to identify PD source from the quadrant dependence of information transmission rate (hereinafter referred to PHY rate [Mbps]) by selecting a pair of quadrants of applied voltage phase; i.e. 1st and 3rd quadrants, or 2nd and 4th ones. It was found that the PHY (Abbreviation for the lowest physical layer in the OSI (open systems interconnection) hierarchical model.) rate number distribution reflects the PD characteristics obtained by the phase resolved PD (PRPD) pattern. Environmental noise level is also measured at an actual substation using PDMS-PLC. Consequently, the applicability of PDMS-PLC to PD signal detection and defect type identification is suggested.

DOI： 10.1109/TDEI.2020.009081

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85098012216&origin=inward

Digest Report of Cooperative Research Committee on EINA Magazine Publication Reviewed

Y.Kakimoto, H.Yoshikawa, T.Jogo, T.Wakisaka, M.Kozako, M.Hikita, H.Sato, M.Soeda, H.Tagashira

The 2020 International Conference on Condition Monitoring and Diagnosis (CMD2020) ( 457 ) 2020.10

Long-term Online Partial Discharge Trend Monitoring for Cast Resin Transformers in Switchboard Reviewed

Y.Kakimoto, T.Jogo, M.Kozako, M.Hikita, M.Sato, H.Abe, M.Hirokawa, H.Sato

The 2020 International Conference on Condition Monitoring and Diagnosis (CMD2020) ( 458 ) 2020.10

Digest Report of Cooperative Research Committee on EINA Magazine Publication Reviewed

M.Nagao, Y.Inoue, M.Kozako, N.Fuse

2020 International Symposium on Electrical Insulating Materials (ISEIM) ( DR-8 ) 2020.09

Digest Report of Investigating R&D Committee on Electrical Insulation Reliability of Power Modules Reviewed

M.Kozako, N.Kishi, Y.Hayase

2020 International Symposium on Electrical Insulating Materials (ISEIM) ( DR-4 ) 2020.09

Dielectric Breakdown Characteristic of Refining Treatment Fullerene Doped Epoxy Plate-like Specimens Reviewed

K.Agung Satria, K.Ozuno, Y.Inoue, M.Kozako, M.Hikita, Suwarno, U.Khayam, T.Igarashi, H.Kaji

2020 International Symposium on Electrical Insulating Materials (ISEIM) ( VF-5 ) 2020.09

Discharge Inception Characteristics Analysis of Epoxy/Silica Nanocomposites in SF6 Gas Using Volume-time Theory Reviewed

Y.Inoue, K.Ohzuno, M.Kozako, M.Hikita, H.Masui, H.Mitsudome, H.Yanase, K.Okamoto

2020 International Symposium on Electrical Insulating Materials (ISEIM) ( VL-7 ) 2020.09

Examination of Impulse PD Inception Location by Electric Field Analysis in Ester Oil/Pressboard Composite Insulation System Reviewed

T.Yamada, M.Kozako, M.Hikita, S.Yoshida, H.Hamada, T.Umemoto

2020 International Symposium on Electrical Insulating Materials (ISEIM) ( VL-6 ) 2020.09

Optimization of Partial Discharge Detection Sensitivity of Transient Earth Voltage Sensors Using FDTD Modeling Reviewed

S.Hari Wibowo, U.Khayam, Suwarno, Y.Kakimoto, M.Kozako, M.Hikita

2020 International Symposium on Electrical Insulating Materials (ISEIM) ( VJ-8 ) 2020.09

Proposal of Noise Rejection in Automatic Measurement System of Repetitive Partial Discharge Inception Voltage Reviewed

Y.Nishigaki, S.Takenouchi, M.Kozako, M.Hikita, T.Nakamura, J.Sun, A.Izumi, T.Sakurai, K.Karasawa,T.Hirose

2020 International Symposium on Electrical Insulating Materials (ISEIM) ( VJ-7 ) 2020.09

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Papers - KOZAKO Masahiro