論文 - 迫田 達也
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Assessing long-term reliability of polymeric housing materials
Miyake T., Arata Y., Sakoda T., Otsubo M., Sonoda Y., Yamaguchi H.
IEEJ Transactions on Power and Energy 131 ( 6 ) 530 - 531 2011年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEJ Transactions on Power and Energy
Application of polymeric materials for housing of outdoor insulators is expected to rapidly increase in the near future. However, the lifetime and the aging deterioration, owing to environmental conditions, are concerned. To understand the long-term reliability of the insulation performance of polymeric materials, the salt fog tests were performed on the polymeric insulators made of ethylene vinyl acetate (EVA) and silicone rubber (SiR). The hydrophobicity was also evaluated. The samples which 11 years have passed since the installation were taken away from an actual distribution system in the region where pollution condition was comparatively severe. The results indicated that the polymeric insulators had enough insulation performance. © 2011 The Institute of Electrical Engineers of Japan.
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Nainggolan J., Sakoda T., Hayashi N., Kurihara S., Nagasato S., Kaneko K., Yarimitsu T.
European Journal of Scientific Research 59 ( 1 ) 134 - 142 2011年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：European Journal of Scientific Research
Acoustic emission (AE) sensor was used for detection of electric discharges and diagnosing a joint section of T-branch cross-linked polyethylene (XLPE) cable for 22 kV distribution system. From the head of cable joint, three AE sensors were arranged at the cable surface clockwise at 1200 to each other, and each sensor connected to an amplifier unit. Three AE sensors were used to generate three-dimensional calculation. A high voltage electrode was inserted into the joint section of cable, and then high voltage was applied to generate partial discharge (PD). PD current was detected by a Rogowski coil. The AE signal from the amplifier unit was sent to a digital oscilloscope and recorded in a personal computer for further analyses using LabVIEW. The correlation between AE signal and PD current was clarified. The increase of AE signal has the same linear tendency with increasing PD current. Thereafter, estimated three-dimensional PD locations were found around the head part of joint section of XLPE cable. © EuroJournals Publishing, Inc. 2011.
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Assessing Long-term Reliability of Polymeric Housing Materials 査読あり
Takuma Miyake, Yuya Seo, Tatsuya Sakoda, Masahisa Otsubo
Institute of Electrical Engineers of Japan Transactions on Power and Energy 131 ( 6 ) 530 - 531 2011年6月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Fabrication of electrode groove on silicon solar cell by high-pressure surface discharge
Hamada T., Arakawa S., Otsubo M., Sakoda T.
Electronics and Communications in Japan 94 ( 4 ) 733 - 739 2011年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Electronics and Communications in Japan
We propose a low-cost plasma process technique to fabricate narrower front electrode grooves on a single crystalline silicon solar cell, in which a surface discharge operated at high pressure etches a silicon nitride film 150 nm thick on a silicon layer. Tests showed that the surface discharge could effectively etch the silicon nitride film in a short time; a high etching rate exceeding 3000 nm/min was obtained. Narrow and uniform grooves with a width of less than 70 μm were obtained when the pressure in the chamber, the back electrode length, and the etching time were 152 kPa, 2 mm, and 10 s, respectively. Narrower electrode grooves could be obtained when the back electrode length was short and the pressure was high. © 2011 Wiley Periodicals, Inc.
DOI： 10.1002/ecj.10305
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日高 徹, 金子 正光, 三宅 琢磨, 竹之内 修, 林 則行, 迫田 達也, 大坪 昌久
電気学会研究会資料. ED, 放電研究会 2011 ( 15 ) 25 - 28 2011年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Comparison of degradation phenomena on silicone rubbers eroded by DC and AC discharges
Shiibara D., Arata Y., Sakoda T., Otsubo M., Anjiki T.
IEEJ Transactions on Fundamentals and Materials 130 ( 11 ) 1009 - 1012 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEJ Transactions on Fundamentals and Materials
The salt fog tests for silicone rubbers (SiR) were performed under DC or AC voltage application. During a test, intensive discharges occurred around an earth electrode when positive DC voltage was applied. In the case of negative DC voltage application, intensive discharges occurred around an electrode which the voltage was applied. In other words, the intensive discharge concentrated around a cathode electrode, which caused heavy erosion around the electrode. In contrast, for the case of AC voltage application, the intensive discharge and heavy erosion did not occur. © 2010 The Institute of Electrical Engineers of Japan.
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Etching characteristics of fabricated grooves on silicon solar cell using surface discharge plasma
Hamada T., Sakoda T.
IEEJ Transactions on Fundamentals and Materials 130 ( 11 ) 999 - 1003 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEJ Transactions on Fundamentals and Materials
A buried contact is one of effective techniques to improve the efficiency of solar cells. However, the etching of the patterned front contact on the surface of a solar cell is required. Therefore, we proposed a maskless etching technique using the surface discharge plasma operated at atmospheric pressure. The streamer-like discharge channels, which ignited near a triple junction point between the quartz glass layer, the solar cell, and the gas space, played an essential role in the etching. The etching rate of a silicon solar cell of which the surface had randomly distributed pyramid-like structures, was in the range of 3 - 5 μm/min when the applied voltage was 4.0 kV. © 2010 The Institute of Electrical Engineers of Japan.
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Sakoda T., Bowden M.
IEEJ Transactions on Fundamentals and Materials 130 ( 11 ) 1026 - 1030 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEJ Transactions on Fundamentals and Materials
We propose a multi-pass laser spectroscopic technique which is useful for diagnosing atmospheric pressure discharges. The key to the technique is to recycle a single laser pulse with low energy many times through the measurement area, avoiding the perturbation that a high energy pulse would induce while maintaining large signal levels. The pulse from a Q-switched laser is injected into an optical cavity, and a Pockels cell is used to rotate the polarization of the beam 90°, trapping it in the cavity. We set up this laser system and successfully obtained a semi-infinite series of pulses. © 2010 The Institute of Electrical Engineers of Japan.
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Studies on acoustic emission signals detected in an oil-immersed pole transformer
Yamamoto T., Nakashima T., Sakoda T., Otsubo M., Kurihara S., Nagasato S., Yarimitsu T.
IEEJ Transactions on Fundamentals and Materials 130 ( 11 ) 1031 - 1036 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEJ Transactions on Fundamentals and Materials
Acoustic emission (AE) waves owing to partial discharges (PDs) in a 6 kV-oil-immersed pole transformer are influenced by windings, a magnetic core, and insulating paper because the AE waves proceed in all directions. To evaluate the amount of electrical charge due to a PD from AE signals detected by piezoelectric AE sensors, characteristics of AE signals obtained by arranging AE sensors at various positions were evaluated. We also investigated that the intensity ratio of frequency components of a detected AE signal was useful for estimating the rough location of a PD. © 2010 The Institute of Electrical Engineers of Japan.
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Relationship between leakage current and pollution deposits on the surface of polymeric insulator
Miyake T., Seo Y., Sakoda T., Otsubo M.
IEEJ Transactions on Fundamentals and Materials 130 ( 11 ) 1037 - 1041 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEJ Transactions on Fundamentals and Materials
Application of polymeric materials used for housing insulators is considered. However, because polymeric insulator is organic matter, the aged deterioration is anxious. The lifetime of polymeric insulator is influenced by environmental conditions such as ultraviolet, acid rain, and polluted deposits. A change of the surface condition of polymeric material causes the dry band arc discharge and the discharge may lower the insulation strength. To investigate the relationship between insoluble pollution and occurrence of dry band arc discharge, we performed a salt-fog test with ethylene vinyl acetate (EVA) samples. The results showed that the heavy erosion caused by frequent dry band arc discharges occurred even in the case of a light polluted condition. Additionally, a very characteristic increase tendency in leakage current with a period of about 5 h was observed during the mist period. © 2010 The Institute of Electrical Engineers of Japan.
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Maskless etching using atmospheric pressure non-thermal surface discharge plasma
Hamada T., Mizumoto T., Arimura T., Sakoda T.
IEEJ Transactions on Fundamentals and Materials 130 ( 10 ) 907 - 912 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEJ Transactions on Fundamentals and Materials
We proposed and examined a maskless plasma surface patterning technique to fabricate 3 mm pitches of front contact grooves on a single crystalline silicon solar cell, in which the surface discharge operated at atmospheric pressure etched the silicon nitride film of 150 nm thickness on a silicon layer. In addition, we investigated etching characteristics of flat surface silicon and the distribution of electric field in our proposed surface discharge etcher. The electrical field distribution of our proposed surface discharge etcher was concentrated at triple junction points, and its strength electrical field intensity was around 4.0 × 10 6 V/m. Finally, we showed that the surface discharge could effectively etch the silicon nitride film in a 3 mm pitch. © 2010 The Institute of Electrical Engineers of Japan.
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Location of partial discharge at joint section of XLPE cable using acoustic emission technique
Nainggolan J., Nakashima T., Sakoda T., Otsubo M., Kurihara S., Nagasato S., Yarimitsu T.
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2010 Vol.2 442 - 445 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
In this study, an acoustic emission (AE) technique was used for diagnosing a joint section of cross-linked polyethylene (XLPE) cable. The correlation between AE signal and partial discharge (PD) current was first investigated. The joint section of. XLPE cable was 22 kV T branch joint with a diameter of 91.6 mm. Three AE sensors were located at the cable surface, 140 mm and 130 mm from the head of cable joint. The sensors use magnet holders for detecting PDs. For each distance from the head of cable joint, the AE sensors were placed at cable surface with the angle deviations of 120 degrees. At the tip of the head of cable joint, an artificial void was made with a diameter of 1.5 mm. The AE signal detected by the AE sensors was amplified by a preamplifier and a main amplifier. A high voltage electrode was inserted into the joint section of XLPE cable, and then high voltage was applied to generate PDs. PD current was detected by a Rogowski coil. The AE signal from the main amplifier was sent to a digital oscilloscope and recorded in a personal computer for further analyses, such as the fast Fourier transform (FFT). The correlation between AE signal and PD current was clarified. The increase of AE signal has the same linear tendency with increasing PD current. Furthermore, estimated PD locations were found around the head part of joint section of XLPE cable. ©2010 IEEE.
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Study on change morphology of ZnO elements by a large impulse current
MIYAZAKI S., SAKODA T., OTSUBO M., MIYAKE T., NAKATA H., KINOSHITA F., YAMAGUCHI H.
電気学会研究会資料. ED, 放電研究会 2010 ( 60 ) 97 - 100 2010年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Characteristics of Deteriorated ZnO Elements with Stripe-shaped Destruction Trace 査読あり
S. Miyazaki, T. Sakoda, M. Otsubo, T. Miyake, H. Nakata, F. Kinoshita
15th Asian Conference on Electrical Discharge 74 - 77 2010年11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）
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Characteristics of Deteriorated ZnO Elements with Stripe-shaped Destruction Trace 査読あり
S. Miyazaki, T. Sakoda, M. Otsubo, T. Miyake, H. Nakata, F. Kinoshita
15th Asian Conference on Electrical Discharge 74 - 77 2010年11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）
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Study on Insulation Degradation Difference between AC and DC Applications 査読あり
Takuma Miyake, Yuya Seo, Tatsuya Sakoda, Masahisa Otsubo, Tomikazu Anjiki
15th Asian Conference on Electrical Discharge 62 - 65 2010年11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）
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Investigation of Partial Discharge Location at Joint Section of XLPE Cable Using Acoustic Emission Technique 査読あり
J. M. Nainggolan, Toshihiko Nakashima, Tatsuya Sakoda, Masahisa Otsubo, Satoshi Kurihara, Shinya Nagasato
15th Asian Conference on Electrical Discharge 30 - 33 2010年11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）
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Relationship between Leakage Current and Pollution Deposits on the Surface of Polymeric Insulator 査読あり
Takuma Miyake, Yuya Seo, Tatsuya Sakoda, Masahisa Otsubo
Institute of Electrical Engineers of Japan Transactions on Electrical and Electronic Engineering 130 ( 11 ) 1009 - 1012 2010年11月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Comparison of Degradation Phenomena on Silicone Rubbers Eroded by DC and AC Discharges 査読あり
Daiki Shiibara, Yoshihiro Arata, Tatsuya Sakoda, Masahisa Otsubo, Tomikazu Anjiki
Institute of Electrical Engineers of Japan Transactions on Electrical and Electronic Engineering 130 ( 11 ) 1009 - 1012 2010年11月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Proposal of Multi-pass Laser Spectroscopic Technique for Diagnosing Atmospheric Pressure Discharge Plasmas 査読あり
Tatsuya Sakoda, Mark Bowden
Institute of Electrical Engineers of Japan Transactions on Electrical and Electronic Engineering 130 ( 11 ) 1026 - 1030 2010年11月
記述言語：英語 掲載種別：研究論文（学術雑誌）