Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Masafumi Takei"'
Autor:
Akiko Kumada, Kazuki Ozawa, Takanori Yasuoka, Masafumi Takei, Yoshikazu Hoshina, Kunihiko Hidaka
Publikováno v:
2018 IEEE 2nd International Conference on Dielectrics (ICD).
DC-GIS is used in HVDC systems because of its excellent insulation performance. However, when DC voltage is applied to DC-GIS, charges are accumulated on the surface of the insulator. This leads to decrease the breakdown voltage. Therefore, understan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4b397e850528f9b1bc5982bf6d117c00
https://doi.org/10.1109/icd.2018.8514711
https://doi.org/10.1109/icd.2018.8514711
Autor:
Steven A. Boggs, Abe Yuta, Manaho Matsubara, Masafumi Takei, Kenichi Nojima, Takanori Yasuoka, Motoharu Shiiki
Publikováno v:
2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP).
Particle motion in Gas Insulated Switchgear (GIS) is a key factor that affects the insulation reliability of GIS. This paper presents a method to identify the particle parameters necessary for the particle motion simulation through matching of measur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b477d0c7aa3e316001f4fae6095f4bc7
https://doi.org/10.1109/ceidp.2017.8257559
https://doi.org/10.1109/ceidp.2017.8257559
Autor:
Okamoto Tetsushi, Toshiyuki Nakano, Motoharu Shiiki, Masafumi Takei, Hidehito Matsuzaki, Hideyasu Ando
Publikováno v:
2017 International Symposium on Electrical Insulating Materials (ISEIM).
Reduced dimensions of Gas Insulated Switchgear (GIS) implies a relatively high electric field in the enclosure. To suppress particle movement in the GIS tank, a nonlinear resistive coating has been developed that contains microvaristor fillers. The e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fdee7b52f2acc3544a64fbb2da551205
https://doi.org/10.23919/iseim.2017.8166593
https://doi.org/10.23919/iseim.2017.8166593
Autor:
Masafumi Takei, Masayuki Sato, Motoharu Shiiki, Steven A. Boggs, Takanori Yasuoka, Xueqin Zhang, Kenichi Nojima
Publikováno v:
IEEE Transactions on Dielectrics and Electrical Insulation. 21:2062-2069
An existence of an electrostatic force which draws the particle in the direction of increasing field was indicated by FEM analysis. An approximate formula of the electrostatic force was derived analytically and compared with the results of FEM analys
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e0c8c7fb92f510f09ac1e301b11740bb
https://doi.org/10.1109/tdei.2014.004435
https://doi.org/10.1109/tdei.2014.004435
Autor:
Koji Yoshinaga, Masayuki Hikita, Hiroaki Toda, Taketoshi Miyamoto, Masahiro Kozako, Masafumi Takei, Hideyuki Nakatsu, Daisuke Hirata, Shuhei Yamada
Publikováno v:
Electronics and Communications in Japan. 97:24-32
SUMMARY Multiwalled carbon nanotube (CNT)/epoxy nanocomposites were fabricated and used to coat epoxy insulating substrates in order to uniformize the surface conductivity. The effects of polymer functionalization of CNT on the dispersion of CNT in a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae88f62dddadaba8b718092f708dc294
https://doi.org/10.1002/ecj.11555
https://doi.org/10.1002/ecj.11555
Autor:
Hidehito Matsuzaki, Motoharu Shiiki, Kenichi Nojima, Xueqin Zhang, Masafumi Takei, Hideyasu Ando
Publikováno v:
Electrical Engineering in Japan. 188:27-35
SUMMARY To suppress metallic particle lift-off in compact gas-insulated switchgear (GIS), a coating with nonlinear resistivity characteristics was developed for the inner surface of the GIS tank. An electrical field analysis that measured the current
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::24258faf43b780889f266c9076050c06
https://doi.org/10.1002/eej.22535
https://doi.org/10.1002/eej.22535
Autor:
Nakano Osamu, Osamu Hosokawa, Takayuki Kobayashi, Kojiro Aoki, Masafumi Takei, Toshihiro Maekawa
Publikováno v:
IEEJ Transactions on Power and Energy. 134:811-819
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3a69f1f4cc199e2f656cdf776b66bed2
https://doi.org/10.1541/ieejpes.134.811
https://doi.org/10.1541/ieejpes.134.811
Autor:
Takanori Yasuoka, Akiko Kumada, Shigeyasu Matsuoka, Masafumi Takei, Yoshikazu Hoshina, Hiroyuki Iwabuchi, Kunihiko Hidaka
Publikováno v:
IEEE Transactions on Dielectrics and Electrical Insulation. 20:1895-1901
The charge density distribution of the downsized GIS disc spacer made of epoxy resin was measured in 0.5-MPa (abs.) SF6 gas. A dc voltage was applied to the spacer, and the charge density on the surface was measured using an electrostatic probe. Volt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::87b28d3d082e83dfa0812dc7a31192dd
https://doi.org/10.1109/tdei.2013.6633722
https://doi.org/10.1109/tdei.2013.6633722
Autor:
Hidehito Matsuzaki, Hideyasu Ando, Masafumi Takei, Tetsushi Okamoto, Motoharu Shiiki, Toshiyuki Nakano
Publikováno v:
2016 IEEE Electrical Insulation Conference (EIC).
In recent years, Gas Insulated Switchgear (GIS) is becoming compact which implies a relatively high electric field in the enclosure. In the result, its compactness can make metallic particles move easily. To suppress the movement of particles in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3dc9bf712ed13b0cfe2280348eae1506
https://doi.org/10.1109/eic.2016.7548678
https://doi.org/10.1109/eic.2016.7548678
Autor:
Masafumi Takei, Kunihiko Hidaka, Shigeyasu Matsuoka, Taiki Donen, Yoshikazu Hoshina, Hiroyuki Iwabuchi, Akiko Kumada
Publikováno v:
Electrical Engineering in Japan. 181:29-36
When a DC voltage is applied to an insulating spacer, the electric field distribution around it is determined by the resistivity of the material. Consequently, charges are accumulated on the surface of the insulator, and its breakdown voltage may bec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dfdec6b49255436da3ca806f5d28c14b
https://doi.org/10.1002/eej.22272
https://doi.org/10.1002/eej.22272