研究者詳細 - 小迫　雅裕

論文 - 小迫　雅裕

分割表示365 件中 161 - 180 件目／全件表示 >>

Evaluation on Applicability to Electrical Insulating Material of Hydrocarbon-Based Thermosetting Resin 査読有り

K.Yoshida, M.Kozako, S.Ishibe, M.Hikita , N.Kamei

Electronics and Communications in Japan 100 ( 4 ) 83 - 90 2017年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Wiley Periodicals, Inc. This paper deals with dielectric properties of hydrocarbon-based thermosetting resin to evaluate the applicability to electrical insulating materials. Moreover, higher withstand voltage, lower dielectric constant, and lower moisture absorption are required for the electrical insulating materials. One of the candidate polymer materials satisfying such demands is hydrocarbon-based thermosetting resin, that is, polydicyclopentadiene (P-DCP) and polytricyclopentadiene (P-TCP). We measured the dielectric properties such as dielectric constant, dielectric loss, volume resistivity, and breakdown strength (BDS), and other properties such as moisture absorption, viscosity, mechanical strength, glass transition temperature, and coefficient of linear expansion of those specimens. It was found from the results in particular that P-DCP and P-TCP have the lower dielectric constant and the lower moisture absorption as compared with epoxy resin, while the volume resistivity and the BDS of P-DCP and P-TCP are not different to those of epoxy resin. As a result, it is elucidated that two kinds of hydrocarbon-based thermosetting resin have a potential for application to an electrical insulating material.

DOI： 10.1002/ecj.11953

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85014775179&origin=inward

油/プレスボード複合絶縁系におけるインパルス沿面放電特性に及ぼす白色放電生成物の影響査読有り

赤星卓勇, Jang Kyunghoon, 小迫雅裕, 匹田政幸, 海永壮一朗, 吉田成是, 梅本貴弘, 吉村学, 釣本崇夫

電気学会論文誌A 137 ( 4 ) 188 - 195 2017年04月

記述言語：日本語掲載種別：研究論文（学術雑誌）

© 2017 The Institute of Electrical Engineers of Japan.We have investigated the effect of white discharge trace remaining on pressboard (PB) surface on the impulse creeping discharge characteristics in oil/PB composite insulation system. This paper deals with the effect of the white trace on the partial discharge inception voltage (PDIV), the number of discharge pulses, the discharge charge amount, and the time delay of discharge occurrence under the standard lightning impulse voltage application. Then, we also investigated the mechanism how the white trace affected the creeping discharge characteristics.

DOI： 10.1541/ieejfms.137.188

Scopus

CiNii Article

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85017026475&origin=inward

Impulse creepage discharge properties of solid coated pressboard/oil composite insulation with rod-plane electrode system 査読有り

K.Jang, T.Akahoshi, M.Kozako, M.Hikita

電気学会論文誌A 137 ( 2 ) 113 - 118 2017年02月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 The Institute of Electrical Engineers of Japan.The surface of oil immersed pressboard (PB) influences partial discharge (PD) inception voltage and creepage discharge properties. This paper deals with surface modification of insulating paper by thin solid layer coating such as epoxy resin, Teflon and nano size silica /epoxy resin composites on PB surface to improve electrical insulation properties of oil /pressboard composite insulation system. Five kinds of specimens are prepared with different coating materials to investigate creepage discharge initiation and propagation under positive standard lightning impulse voltage (1.2 /50 μs) using a rod-plane electrode arrangement in mineral oil. Creepage discharge properties of conventional PB in oil/ PB composite insulation system are compared with that of the solid layer coated PB in terms of discharge final propagation length (ld) and PD inception voltage (PDIV) as an inception probability (Pi). The results show that PDIV of the solid layer coated PB increases at all applied impulse voltage levels compared with that of conventional PB. Especially, when the filler content of nano silica added in base epoxy was SP-0.2wt%, PDIV characteristic was improved. The effect of solid layer coating of PB surface on the creepage discharge properties is also discussed in terms of the effects of introduced deep electron traps due to the nano composites coating as well as the drying effect to remove water content and the surface roughness of PB.

DOI： 10.1541/ieejfms.137.113

Scopus

CiNii Article

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85012271856&origin=inward

Non-empirical (ab initio) molecular orbital method 査読有り

Kozako M.

Advanced Nanodielectrics: Fundamentals and Applications 345 - 351 2017年01月

Low thermal fault gases of various natural monoesters and comparison with mineral oil 査読有り

A.Rajab, M.Tsuchie, M.Kozako, M.Hikita, T.Suzuki

IEEE Transactions on Dielectrics and Electrical Insulation 23 ( 6 ) 3421 - 3428 2016年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 IEEE.Natural ester oils began to be implemented in higher voltage of power transformer in 2002. Gases generated by such oils need to be examined in order to anticipate the use of dissolved gas analysis (DGA) method to diagnose the presence of faults in natural ester filled transformer in service. This paper deals with an analysis of the gas generations of natural monoesters of different molecular structures derived from palm and rice bran oils under localized and low thermal faults ranging from 200 to 300 °C. Types of gases and their generation rates at various temperature levels were investigated. An attempt is made to compare the gas generation tendency between tested oils and commercially available natural ester insulation oil reported in the previous literature as well as mineral oil. The phenomenon of ethane generation by fatty acid monoesters having C-C double bond in their hydrocarbon chains and those without C-C double bond are discussed. Due to the expectation of overheating temperature, the possible implementation of CO/CH4 gas ratio is also evaluated.

DOI： 10.1109/TDEI.2016.006068

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85010453383&origin=inward

Experimental Verification of Operation and Method of Decision of Maximum DC Link Voltage in Wireless Power Transfer System 査読有り

H.Tokunaga, H.Tanabe, A.Imakiire, M.Kozako, M.Hikita

IEEE TENCON 2016 - Technologies for Smart Nation 797 - 800 2016年11月

Dependence of Silica Nano Filler added to Epoxy Resin on Creepage Discharge Properties in Mineral Oil 査読有り

K.Jang, T.Akahoshi, M.Kozako, M.Hikita

10th International Workshop on High Voltage Engineering　and 2016 Japan-Korea Joint Symposium on Electrical Discharge and High Voltage Engineering (IWHV2016 ＆ JK2016） ( ED-16-116 SP-16-045 HV-16-101 ) Vol.1,73 - Vol.1,76 2016年11月

EARLY DETERIORATION OF PALM FATTY ACID ESTERS (PFAE) OIL 査読有り

A.Rajab, M.Tsuchie, M.Kozako, M.Hikita, T.Suzuki

10th International Workshop on High Voltage Engineering　and 2016 Japan-Korea Joint Symposium on Electrical Discharge and High Voltage Engineering (IWHV2016 ＆ JK2016） ( ED-16-142 SP-16-071 HV-16-127 ) Vol.2,37 - Vol.2,40 2016年11月

Comparison of Electrical Insulation Properties of Hydrocarbon-based - Thermosetting Resin and Epoxy Resin 査読有り

Y.Fuchi, K.Yoshida, M.Kozako, M.Hikita, N.Kamei

IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP2016) ( 3A-18 ) 133 - 136 2016年10月

Partial Discharge and Breakdown Characteristics of Inverter-fed Motor Winding with Micro Cellular Coating 査読有り

M.Hikita, N.Yanaze, T.Uchimura, M.Kozako, K.Tomizawa, M.Ohya

IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP2016) ( 4B-36 ) 482 - 485 2016年10月

Partial Discharge Properties of Resin Molded Insulation Substrate after Long Term Voltage Application 査読有り

Y.Akinaga, H.Mitsudome, M.Kozako, M.Hikita, K.Taniguchi, Y.Nakamura, Y.Ikeda, K.Okamoto

IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP2016) ( 4B-29 ) 453 - 456 2016年10月

Comparison of Sensor Detection Sensitivity in Repetitive Partial Discharge Inception Voltage Measurement for Twisted Pair Placed in Stator 査読有り

K.Nakamura, T.Uchimura, M.Kozako, M.Hikita, T.Ueno, J.Sun, T.Sakurai, K.Nakayama, T.Ikegami, K.Karasawa

IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP2016) ( 3C-19 ) 239 - 242 2016年10月

Partial Discharge Detection and Induced Surface Current Analysis Using Transient Earth Voltage Method for High Voltage Equipment 査読有り

A.Itose, M.Kozako, M.Hikita

The 2016 International Conference on Condition Monitoring and Diagnosis (CMD2016) ( P1-27 ) 455 - 459 2016年09月

Degradation Diagnosis of Electrical Insulation Performance of 6.6 kV Class Epoxy Resin Insulator Contaminated with Iron Powder and Moisture 査読有り

T.Koga, A.Itose, H.Prasetia, M.Kozako, M.Hikita

The 2016 International Conference on Condition Monitoring and Diagnosis (CMD2016) ( P2-52 ) 803 - 806 2016年09月

Partial Discharge Characteristics of Oil Impregnated Paper Insulation System with Oil Gap under Repetive Impulse Voltage Superimposed on AC Voltage 査読有り

Y.Iwashita, M.Kozako, M.Hikita, Y.Makino, T.Kurihara, T.Takahashi, T.Okamoto

The 2016 International Conference on Condition Monitoring and Diagnosis (CMD2016) ( P1-43 ) 522 - 525 2016年09月

Development of Diagnostic Methods for Vacuum Leakage from Vacuum Interrupter by Partial Discharge Detection 査読有り

S.Yokomichi, M.Kozako, M.Hikita, K.Sato, T.Moriyama, H.Urai, T.Nakaoka, K.Tsuchiya

27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV2016) ( C1-P-21 ) 611 - 614 2016年09月

Partial Discharge Characteristics Of Wedge-Shaped Gap Between Coated Electrodes In SF6 Under Lightning Impulse Voltage 査読有り

K.Maeda, S.Nakamura, M.Kozako, M.Hikita, S.Yoshida, T.Chigiri

21st International Conference on Gas Discharges and Their Applications (GD2016) ( B6 ) 301 - 304 2016年09月

電界下のエポキシ溶液中無機粒子の挙動に与える各種パラメータの影響査読有り

米須大吾, 松岡直哉, 小迫雅裕, 匹田政幸

電気学会論文誌Ａ 136 ( 9 ) 586 - 591 2016年09月

Basic study on partial discharge location in power module 査読有り

Mitsudome H., Akinaga Y., Matsuo K., Kozako M., Hikita M., Ikeda Y., Taniguchi K., Nakamura Y., Okamoto K.

Proceedings of the 2016 IEEE International Conference on Dielectrics, ICD 2016 1 451 - 454 2016年08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）

© 2016 IEEE. This paper deals with partial discharge (PD) location in a power module by measuring electromagnetic (EM) wave of PD using four loop sensors. As the distance between the sensor and PD source decreases, the peak to peak magnitude of the first wave of detected EM wave was found to increase using four sensors array. An attempt is made to locate PD source using output electromagnetic waves detected four loop sensors by the time of flight method. As a result, the present method is found to allow PD location with location identification error of 5 mm.

DOI： 10.1109/ICD.2016.7547640

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84987898756&origin=inward

Effect of Permittivity Variation on Surface Flashover of GIS Epoxy Spacer Model in SF6 Gas 査読有り

N.Matsuoka, Y.Fuchi, M.Kozako, M.Hikita

International Conference on Dielectrics (ICD2016) ( 1-10 ) 96 - 99 2016年07月

　前のページ - 次のページ　

<小迫 雅裕>

論文 - 小迫 雅裕

<小迫　雅裕>

論文 - 小迫　雅裕