Papers - SAKODA Tatsuya
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Surface Modification of Carbon Electrode using Argon Plasma Reviewed
D. Tashima, A. Sakamoto, M. Taniguchi, T. Sakoda, M. Otsubo
The 9th International Symposium on Sputtering & Plasma Process 283 - 286 2007.6
Language：English Publishing type：Research paper (international conference proceedings)
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Reduction of Harmonic Currents and Evaluation of Luminous Efficiency in a Lag Type Operating Circuit of a Metal Halide Lamp Reviewed
M. Kurozumi, T. Sakoda, M. Otsubo
18th International Symposium on Plasma Chemistry 30Ｐ81-1 - 30Ｐ81-4 2007.8
Language：English Publishing type：Research paper (international conference proceedings)
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Evaluation of Electrode Grooves Formed Using Surface Discharge Plasma Reviewed
T. Hamada, T. Sakoda, M. Otsubo, M. Matsui, K. Nagasawa
18th International Symposium on Plasma Chemistry 28Ｐ74-1 - 28P74-4 2007.8
Language：English Publishing type：Research paper (international conference proceedings)
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Measurements of Sputtered Particles in Surface Discharge Using Laser Induced Fluorescence Technique Reviewed
T. Sakoda, S. Takagi, Y. Tanaka, C. Honda
Laser Aided Plasma Diagnostics 88 - 91 2007.9
Language：English Publishing type：Research paper (international conference proceedings)
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Relation between Dry Band Arc Discharge Development and Erosion Shape on the Silicon Rubber Reviewed
Keiich Haji, Yong Zhu, Masahisa Otsubo, Tatsuya Sakoda, Chikahisa Honda
2007 Annual Report Conference on Electrical Insulation and Dielectric Phenomena 312 - 315 2007.10
Language：English Publishing type：Research paper (international conference proceedings)
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Studies of Elastic Waves in Ethylene Propylene Rubber Using Acoustic Emission Sensor Reviewed
M. Takaoka, T. Sakoda, M. Otsubo, K. Yoshimitsu and M. Iki
2007 Japan-Korea Joint Symposium on Electrical Discharge and High Voltage Engineering 15 - 18 2007.11
Language：English Publishing type：Research paper (international conference proceedings)
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Studies on Understandings of Insulation Performance of ZnO Surge Arrester with Series Gap Reviewed
Y. Miyakawa, T. Sakoda, M. Otsubo, T. Harada, K. Sakoda
2007 Japan-Korea Joint Symposium on Electrical Discharge and High Voltage Engineering 311 - 314 2007.11
Language：English Publishing type：Research paper (international conference proceedings)
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Effects of Back Electrode for Etching of Silicon Nitride Film on Solar Cells Using Surface Discharge Reviewed
J. Arakawa, T. Hamada, T. Sakoda, M. Otsubo
2007 Japan-Korea Joint Symposium on Electrical Discharge and High Voltage Engineering 91 - 94 2007.11
Language：English Publishing type：Research paper (international conference proceedings)
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Characteristics of On-line Partial Discharge on Hydrogenerator Stator Windings by Hybrid Detection Method with AE sensors and CT sensor Reviewed
T. Tsuji, T. Kaneko, R. Hiratani, I. Maeda, C. Honda, M. Otsubo, T. Sakoda, O. Takenouchi, S. Fukumoto, A. Tokumitsu, T. Kai, M. Andou
2007 Japan-Korea Joint Symposium on Electrical Discharge and High Voltage Engineering 23 - 26 2007.11
Language：English Publishing type：Research paper (international conference proceedings)
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Dry Band Arc Discharge and its Predischarge on Silicon Rubber Specimens Reviewed
K. Haji, D. Shiibara, Y. Yamashita, T. Miyake, T. Sakoda, M. Otsubo
2007 Japan-Korea Joint Symposium on Electrical Discharge and High Voltage Engineering 231 - 234 2007.11
Language：English Publishing type：Research paper (international conference proceedings)
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Fabrication of Electrode Grooves on Silicon Solar Cells Using Surface Discharge Reviewed
T. Hamada, S. Arakawa, T. Sakoda, M. Otsubo
17th International Photovoltaic Science and Engineering Conference 708 - 709 2007.12
Language：English Publishing type：Research paper (international conference proceedings)
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Visualization of sound field with uniform phase distribution using laser beam microphone coupled with computerized tomography method Reviewed
Tatsuya Sakoda and Yoshito Sonoda
Acoustical Science and Technology 29 ( 4 ) 295 - 299 2008.4
Language：English Publishing type：Research paper (scientific journal)
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Characteristics of On-line and Off-line Partial Discharge for Hydorogenerator Stator Windings with AE Sensor and CT Sensor Reviewed
I. Maeda, T. Kaneko, O. Takenouchi, T. Miyake, T. Sakoda, M. Otsubo, S. Fukumoto, A. Tokumitsu, T. Kai, M. Ando
Proceedings of 2008 International Symposium on Electrical Insulating Materials 577 - 580 2008.9
Language：English Publishing type：Research paper (international conference proceedings)
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Influence of Temperature Variation on Characteristics of ZnO Elements Reviewed
Y. Miyakawa, T. Sokoda, M. Otsubo and M.Ikuta
Proceedings of 2008 International Symposium on Electrical Insulating Materials 119 - 112 2008.9
Language：English Publishing type：Research paper (international conference proceedings)
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Fundamental Research on Characteristics of Hydrophobicity Disappearance of Silicone Rubber Surface in Dynamic Drop Test Reviewed
D. Shibara, K. Haji, T. Sakoda, M. Otsubo
Proceedings of 2008 International Symposium on Electrical Insulating Material 99 - 102 2008.9
Language：English Publishing type：Research paper (international conference proceedings)
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Relation Between Leakage Current and NSDD on the Surface of Polymer Insulator Reviewed
Y. Yamashita, T. Miyake, H. Haji, T. Sakoda, M. Otsubo
roceedings of 2008 International Symposium on Electrical Insulating Materials 103 - 106 2008.9
Language：English Publishing type：Research paper (international conference proceedings)
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Studies of Elastic Waves in Ethylene Propylene Rubber Using Acoustic Emission Sensor Reviewed
Masanori Takaoka, Tatsuya Sakoda, Masahisa Otsubo, Shigeru Akaiwa, Masatoshi Iki, Shigeharu Nakano
IEEE (Institute of Electrical Engineers of Japan) Transaction on Fundamentals and Materials Society 128 ( 10 ) 641 - 646 2008.10
Language：English Publishing type：Research paper (scientific journal)
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Khaing M.T., Watanabe K., Sakoda T., Takayama T., Miyazaki K.
IEEE Transactions on Dielectrics and Electrical Insulation 2025.2
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Transactions on Dielectrics and Electrical Insulation
residual charge method is useful for measuring water-tree in 22kV cross-linked polyethylene (XLPE) cable systems. However, the conventional residual charge method can’t locate a water-tree degraded cable section because the time-resolved signal response from a water-tree degradation section can’t be obtained. In this study, we inject a sine wave pulse with a frequency of 1MHz into measuring object cables when AC voltage is applied to the cables to release trapped charges due to the water-tree. We examine to locate a water-tree degraded cable section in 22kV XLPE cable systems including water-tree degraded cables and a Y-branch cable joint. The time-resolved residual charges induced by the voltage pulse induced by an injection coil can locate a water-tree degraded cable section.
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Evaluation of Degradation Degree on Silicone Rubber by Using Surface Discharge Reviewed
Khaing M.T., Hirose N., Miyake T., Sakoda T., Goto S., Anjiki T., Chiba T.
IEEJ Transactions on Electrical and Electronic Engineering 1 - 8 2025.1
Authorship：Corresponding author Publishing type：Research paper (scientific journal) Publisher：IEEJ Transactions on Electrical and Electronic Engineering
Silicone rubber (SiR) insulators in outdoor may be degraded owing to multiple environmental stresses such as ultraviolet (UV) rays, high temperature and pollution adhesion. Evaluation of the degradation degree of SiR can contribute to the long-term maintenance of SiR insulators. We proposed a novel technique to grasp the degradation degree of SiR. The surface discharge (SD) on the SiR surface temporarily decreased the surface hydrophobicity, and then the hydrophobicity recovery time was evaluated. The SD treatments were performed on SiR specimens cut out from unused, 10 and 20-year-aged SiR insulators, and the treatment time was from 5 to 25 s. After each SD treatment, the contact angle was evaluated at intervals of 10 min. As a result, it was found that the contact angle recovery time increases with the increase of SD treatment time. Also, the contact angle recovery times on 10 and 20-year-aged SiR specimens were longer than that on an unused SiR specimen, i.e. the contact angle recovery time after the SD treatment is useful for investigating the degradation degree. © 2025 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.
DOI： 10.1002/tee.24256
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Watanabe Koki, Sakoda Tatsuya, Takahashi Akira, Negishi Naoyuki, Miyazaki Kazunori
IEEJ Transactions on Fundamentals and Materials 145 ( 1 ) 23 - 29 2025.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan
To establish a novel section locating technique for a water-tree degraded 22 kV cross-linked polyethylene (XLPE) cable that is included in another undegraded cables, we measured a reflected injection pulse at the impedance mismatch which is dependent on water trees. The injection pulse was propagated into cables to be measured, and the measured arrival times of reflected pulses containing residual charges due to water trees were varied depending on the locations of water-tree degraded cables. The section locating was achieved by using arrival time of the reflected pulse.