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Engineering educational research section Electrical and Electronic System Program |
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MAY THIN KHAING
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Degree 【 display / non-display 】
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Bachelor (Electrical) ( 2015.11 Technological University Magway )
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Master (Electrical) ( 2018.9 Yangon Technological University )
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Master ( 2020.9 University of Miyazaki )
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博士（工学） ( 2024.9 宮崎大学 )
Research Areas 【 display / non-display 】
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Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Power engineering
Papers 【 display / non-display 】
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M. T. Khaing, N. Hirose, T. Sakoda, K. Kubo, T. Anjiki, T. Chiba
Journal of Electrostatics 140 2026.3
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Electrostatics
ZnO surge arrester with a spark gap has been employed to reduce electrical failures due to lightning strikes. The discharge time lag commonly occurs in a spark gap due to unstable discharge characteristics. In this study, a new electrode configuration with main and auxiliary electrodes is proposed to make sparkover stable. V-t characteristics and optical emissions of impulse discharge are observed. The auxiliary electrodes generate impulse corona discharge, which emits ultraviolet (UV) ray at the edges of them. Electrons optically released from negative ions in the air between main electrodes make the discharge time lag and its standard deviation small.
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Partial discharge behavior in epoxy resin including insulation paper Reviewed
S. Z. Linn Htet, T. Kondo, T. Miyake, M. T. Khaing, T. Sakoda
Journal of Electrostatics 140 ( 104242 ) 2026.3
Publishing type：Research paper (scientific journal)
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Khin M.O., Hirose N., Khaing M.T., Sakoda T., Nakayama Y., Niwa K.
IEEE Transactions on Dielectrics and Electrical Insulation 2026
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Transactions on Dielectrics and Electrical Insulation
Silicone rubber (SiR) is used for housing material of polymer insulators. This study focuses on the temporal variation in the shape of a water droplet on the SiR surface treated by surface discharge (SD). The SD treatment is used as a controlled electrical stress to investigate how the surface condition and the hydrophobicity of SiR change with aging. A 7 μL distilled water droplet is dropped on unused, 18-year-aged, and 20-year-aged specimens, and the contact angles (θ) were recorded for 600 s to obtain θ – t curves. The obtained curve is divided into four stages: primary maintenance, primary reduction, secondary maintenance, and secondary reduction. The unused specimens show a clear plateau in a secondary maintenance stage because low-molecular-weight (LMW) siloxanes may be dispersed from the SiR bulk to the surface and temporarily restore hydrophobicity. In aged specimens, θ decreases continuously without recovery. The continuous droplet observation after the SD treatment is a simple and effective method to evaluate the degradation of SiR.
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Suppression of Transformer Inrush Current by Applying Lower Frequency and Lower Voltage Reviewed
Kamesawa Tomoyuki, Khaing May Thin, Terashi Kohei, Yamamura Syunichiro, Nishimura Toi, Sakoda Tatsuya, Nishijima Kanta
IEEJ Transactions on Power and Energy 145 ( 8 ) 496 - 501 2025.8
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan
Inrush current phenomenon of a three-phase transformer is caused by mismatching polarities and absolute values of the initial magnetic flux induced by residual flux remnants in each phase core before the transformer is energized. Because the residual flux is the final value of magnetic flux transients that occur immediately after disconnection, the inrush current can be suppressed by considering the residual flux and controlling the timing of a circuit breaker. However, when a transformer is first energized in the field, the residual flux is unknown.In this study, we apply lower frequency and lower voltage to a transformer system simulating a three-phase transformer and then integrates the transformer voltage by time to digitally calculate and capture the true residual flux. Next, when the transformers are energized, a phase angle control is applied to the timing of a switch to effectively suppress inrush current. As a result, the usefulness of the lower frequency and lower voltage application to suppress inrush current is indicated.
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Evaluation of the Degradation Degree of 20-Year-aged Insulator by Using Surface Discharge Reviewed
Khin M.O., Nonoka H., Khaing M.T., Sakoda T., Nakayama Y., Niwa K.
2025 IEEE 5th International Conference on Electrical Materials and Power Equipment Icempe 2025 2025.8
Language：English Publishing type：Research paper (scientific journal) Publisher：2025 IEEE 5th International Conference on Electrical Materials and Power Equipment Icempe 2025
Polymer insulator wherein silicone rubber (SiR) is used as housing material are exposed to various environmental stresses such as ultraviolet (UV) radiation, high temperatures, and pollution, which can lead to degradation over time. Assessing the degree of this degradation is crucial for the long-term maintenance of polymer insulators. This study proposes a novel technique to evaluate the degradation degree of SiR. To effectively expose PDs to specific locations on the SiR surface, we generated surface discharges (SDs). We compared hydrophobicity recovery times between an unused SiR specimen and aged SiR specimens. Our approach involves analyzing the hydrophobicity recovery time after SD treatment. SD treatment temporarily reduces the surface hydrophobicity of SiR, and by measuring the time required for hydrophobicity to recover, we can assess its degradation. Experiments were conducted on SiR specimens extracted from unused, and 20 -year-aged polymer insulators. The SD treatment was applied for 10s. Following each treatment, the contact angle was measured at 5 -minute intervals. Then, we characterized the physical or chemical damage on SiR specimens after the SD treatment using a scanning electron microscope (SEM), and an attenuated reflection-Fourier transform infrared spectroscopy (ATR FTIR). These findings indicate that the contact angle recovery time after SD treatment serves as a valuable parameter for assessing the degradation degree of SiR insulators.
MISC 【 display / non-display 】
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がいしの歴史と最新技術および開発動向 Invited
迫田 達也, メイ ティン カイン
Journal of the Institute of Electrical Engineers of Japan 145 ( 6 ) 324 - 327 2025
Language：Japanese Publishing type：Rapid communication, short report, research note, etc. (scientific journal) Publisher：Journal of the Institute of Electrical Engineers of Japan
1．はじめに高度経済成長を支えてきた我が国の電力業界は，世界に類を見ない，高い電力の安定供給・技術を維持している。この高い信頼性を担う送電，配電設備・機器の一つに“がいし”がある。がいしは，電力線を機械的に保持し，電気的に送電鉄塔や電柱と絶縁する重要な役割を担っている。
Presentations 【 display / non-display 】
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配電用絶縁材料の絶縁破壊特性の比較
May Thin Khaing, Kaito Tanaka, 迫田達也, 濱田滉太, 竪山智博
令和8年電気学会全国大会
Event date： 2026.3
Language：Japanese Presentation type：Oral presentation (general)
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Hydrophobicity Reduction Behavior at a Fixed Point on Unused SiR before and after SD Treatment
May Oo Khin, May Thin Khaing, Tatsuya Sakoda, Yoshiki Nakayama, Kota Niwa
令和8年電気学会全国大会
Event date： 2026.3
Language：Japanese Presentation type：Oral presentation (general)
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Locating Dense Water Treeing Region in XLPE Cables
Kaung Htet Oo, Atsushi Koreeda, May Thin Khaing, Tatsuya Sakoda, Kousei Tsuruta
令和8年電気学会全国大会
Event date： 2026.3
Language：Japanese Presentation type：Oral presentation (general)
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Investigation of Partial Discharge Phenomenon in Epoxy Resin without Insulation Paper
Swe Zin Linn Htet, Nagata Souta, May Thin Khaing, Tatsuya Sakoda, Toru Takayama, Daisuke Mikami
令和8年電気学会全国大会
Event date： 2026.3
Language：Japanese Presentation type：Oral presentation (general)
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E-Eケーブルの複数水トリー劣化区間標定技術の基礎研究
是枝諄，May Thin Khaing，迫田達也，高山亨，柴田輝雄，宮崎和則
令和7年 電気学会 電力・エネルギー部門大会
Event date： 2025.9
Language：Japanese Presentation type：Oral presentation (general)
Awards 【 display / non-display 】
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令和4年電気学会A部門大会・若手英語口頭優秀発表賞
2022.9 年電気学会A部門大会 屋外曝露 20 年が経過したポリマーがいしの表面特性
M. T. Khaing, K. Yoshimura, T. Sakoda, J. Oasa, S. Higashiyama, and Y. Inaoka
Award type：Award from Japanese society, conference, symposium, etc.