Details of a Researcher - SAKODA Tatsuya

Three-dimensional localization of partial discharge at joint section of XLPE cable using acoustic emission method combined with LabVIEW analysis

Nainggolan J., Sakoda T., Hayashi N., Kurihara S., Nagasato S., Kaneko K., Yarimitsu T.

European Journal of Scientific Research 59 ( 1 ) 134 - 142 2011.9

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：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.

Fabrication of electrode groove on silicon solar cell by high-pressure surface discharge

Assessing Long-term Reliability of Polymeric Housing Materials Reviewed

Takuma Miyake, Yuya Seo, Tatsuya Sakoda, Masahisa Otsubo

Institute of Electrical Engineers of Japan Transactions on Power and Energy 131 ( 6 ) 530 - 531 2011.6

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

Hamada T., Arakawa S., Otsubo M., Sakoda T.

Electronics and Communications in Japan 94 ( 4 ) 733 - 739 2011.4

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：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

Influence of Temperature on Characteristics of On-line Partial Discharge on Hydrogenerator Stator Windings

HIDAKA Toru, KANEKO Tadamitsu, MIYAKE Takuma, TAKENOUCHI Osamu, HAYASHI Noriyuki, SAKODA Tatuya, OTSUBO Masahisa

2011 ( 15 ) 25 - 28 2011.1

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

Comparison of Degradation Phenomena on Silicone Rubbers Eroded by DC and AC Discharges

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 2010.12

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

DOI： 10.1541/ieejfms.130.1009

Etching Characteristics of Fabricated Grooves on Silicon Solar Cell Using Surface Discharge Plasma

Toshiyuki Hamada, Tatsuya Sakoda

Institute of Electrical Engineers of Japan Transactions on Electrical and Electronic Engineering 130 ( 11 ) 999 - 1003 2010.12

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

DOI： 10.1541/ieejfms.130.999

Proposal of Multi-pass Laser Spectroscopic Technique for Diagnosing Atmospheric Pressure Discharge Plasmas

Tatsuya Sakoda, Mark Bowden

Institute of Electrical Engineers of Japan Transactions on Electrical and Electronic Engineering 130 ( 11 ) 1026 - 1030 2010.12

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

DOI： 10.1541/ieejfms.130.1026

Studies on Acoustic Emission Signals Detected in an Oil-immersed Pole Transformer

Takuya Yamamoto, Toshihiko Nakashima, Tatsuya Sakoda, Masahisa Otsubo, Satoshi Kurihara, Shinya Nagasato, Takayoshi Yarimitsu

Institute of Electrical Engineers of Japan Transactions on Electrical and Electronic Engineering 130 ( 11 ) 1031 - 1036 2010.12

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

DOI： 10.1541/ieejfms.130.1031

Relationship between Leakage Current and Pollution Deposits on the Surface of Polymeric Insulator

Takuma Miyake, Yuya Seo, Tatsuya Sakoda, Masahisa Otsubo

Institute of Electrical Engineers of Japan Transactions on Electrical and Electronic Engineering 130 ( 11 ) 1037 - 1041 2010.12

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

DOI： 10.1541/ieejfms.130.1037

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 2010.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：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.

Location of Partial Discharge at Joint Section of XLPE Cable using Acoustic Emission Technique

Jannus M. N., T. Nakashima, T. Sakoda, M. Otsubo, S. Kurihara, S. Nagasato, T. Yarimitsu

2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena 2010 Vol.2 442 - 445 2010.12

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

DOI： 10.1109/CEIDP.2010.5723983

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 2010.11

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