研究者詳細 - 小迫　雅裕

論文 - 小迫　雅裕

分割表示400 件中 141 - 160 件目／全件表示 >>

High temperature dielectric property of silicon nitride insulating substrate for next generation power module up to 350 degrees Celsius. 査読有り

Abe T., Nishigaki Y., Kozako M., Hikita M.

2019 International Conference on Electronics Packaging (ICEP2019) 444 - 448 2019年04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）

Japan Niigata 2019年04月17日 - 2019年04月19日

© 2019 Japan Institute of Electronics Packaging. Recently, as power module tends to have higher output density, large-capacity and downsizing of the module are demanded. It also tends to operate at higher temperatures. From the above circumstances, evaluation of high temperature electrical properties of ceramic insulating substrates for application of next generation power module becomes important. However, there are very few reports on the high temperature insulation property of the ceramic insulating substrate. This paper presents dielectric properties (relative permittivity ϵr, relative dielectric loss factor ϵr″ and AC conductivity σac) of ceramic insulating substrate consisting of Silicon Nitride (Si3N4) used for next generation power module up to high temperature of 350 °C. Besides, DC conductivity σdc are evaluated as a function of the temperature of the substrate, from which the activation energy Ea was calculated. Thus obtained results are discussed with the temperature dependence of the permittivity and ac conductivity considered. An attempt is also made to evaluate specific properties of the Si3N4 substrate by comparing with the dielectric properties of Aluminum Nitride (A1N) substrate.

DOI： 10.23919/ICEP.2019.8733529

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過渡接地電圧法による部分放電信号の低周波成分伝搬メカニズムの考察査読有り

吉積弘将, 小迫雅裕, 匹田政幸, 藤井祐樹, 中村勇介, 長広明

電気学会論文誌A 139 ( 3 ) 154 - 160 2019年03月

マイクロ発泡皮膜電線の部分放電開始電圧に及ぼす巻付け時の機械的ストレスの影響査読有り

久保智洋, 前田健太, 小迫雅裕, 匹田政幸, 福田秀雄, 池田佳祐, 冨澤恵一, 武藤大介

電気学会論文誌A 139 ( 3 ) 161 - 166 2019年03月

Volume-Time理論を用いた発泡皮膜線ツイストペアのインパルス部分放電開始電圧の推定査読有り

前田健太, 久保智洋, 小迫雅裕, 匹田政幸, 福田秀雄, 池田佳祐, 冨澤恵一, 武藤大介

電気学会論文誌A 139 ( 3 ) 167 - 173 2019年03月

研究調査委員会レポート：パワーモジュールの電気絶縁信頼性に関する調査専門委員会査読有り

小迫雅裕, 早瀬悠二, 岸直哉

電気学会論文誌．　Ａ ( 一般社団法人電気学会 ) 139 ( 9 ) NL9_4 - NL9_4 2019年01月

Study on static electrification of the PFAE-mineral oil mixture 査読有り

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

IOP Conference Series: Materials Science and Engineering 602 ( 1 ) 2018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）

Indonesia Padang, 2018年11月08日 - 2018年11月09日

© 2019 IOP Publishing Ltd. The natural ester of tri-ester type has been implemented on a high voltage large power transformer, rated at 420 kV, since 2014. The high voltage transformer is known prone to the static electrification risk. Palm fatty acid ester (PFAE) which is a monoester oil type has also been tried on the high voltage power transformer. For a retrofilling purpose, some portion of the previously used insulating oil (it is mainly mineral oil) will remain in the transformer. It is then demanded to study the static electrification of a mixture of PFAE and mineral oil. This paper presents an investigation results on the static electrification properties of PFAE-mineral oil mixture at various percentage ratios of PFAE. The results show that charging tendency (ECT) increase with the percentage ratio of PFAE, but then decreases for the oil containing only PFAE. On the other side, the resistivity of oil mixtures decreases with the increase of percentage ratio of PFAE but then increases for the oil containing only PFAE.

DOI： 10.1088/1757-899X/602/1/012016

Scopus

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Discharge Characteristics and Mechanisms under Medium Vacuum Region in Vacuum Interrupter 査読有り

Y.Nakano, S.Masuda, M.Kozako, M.Hikita, T.Tanaka, M.Kobayashi

The 11th International Workshop on High Voltage engineering (IWHV2018) ( ED-18-092 SP-18-044 HV-18-126 ) 2018年11月

Electric Field Relaxation Effect of Micro-varistor/epoxy Composite 査読有り

K.Abe, S.Harada, Y.Nakano, M.Kozako, M.Hikita, T.Yamamoto, S.Okabe

Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) 2018-October 167 - 170 2018年10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）

Mexico Cancun 2018年10月21日 - 2018年10月24日

© 2018 IEEE. To reduce the size of electric power equipment and enhance its reliability, the electric field stress around spacer in gas insulated switchgear (GIS) should be considered. For the electric field relaxation to such a solid insulation system, a non-linear resistive material (NRM) seems effective. NRM is a composite of micro-varistor and epoxy, and it has excellent non-linear V-I characteristic. This paper deals with verification of the effect of NRM on the field relaxation using a model simulating epoxy spacer with NRM in comparison with metal embedded spacer. By embedding NRM under the electrode, the electric field of the triple junction (TJ) composed of the electrode, gas and insulator can be relaxed by 72 % under the impulse voltage (10 kV). In addition, it can also reduce the electric field concentration by 73 % at the embedded tip in AC voltage.

DOI： 10.1109/CEIDP.2018.8544813

Scopus

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Evaluation of Dielectric Strength of Tricyclopentadiene / Silica Microcomposites 査読有り

Y.Ookubo, M.Kozako, M.Hikita, N.Kamei

The 2018 Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) 2018-October 594 - 597 2018年10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）

Mexico Cancun 2018年10月21日 - 2018年10月24日

© 2018 IEEE. Hydrocarbon-based thermosetting resins have properties such as low viscosity, low dielectric constant and high heat resistance as compared with epoxy resins and are expected to be applied to electric devices in the future. However, hydrocarbon-based thermosetting resins have not been put into practice as an electrically insulating material yet. Therefore, it is necessary to understand the electrical characteristics. Generally, when organic polymeric material is used as an insulator for high voltage equipment, a large amount of loading of inorganic fillers is needed so as to decrease linear expansion coefficient. Therefore, it is crucial to investigate the effect of inorganic filler loading on the various properties such as mechanical, thermal, and electrical properties for higher voltage and longer term operation of highvoltage equipment. From the viewpoints, this paper deals with electrical insulation properties of the hydrocarbon-based thermosetting resin with loaded micro silica particles. As a result, breakdown strength of hydrocarbon-based thermosetting resin is equal or higher than that of the epoxy resin. As a result, it can be said that the hydrocarbon-based thermosetting resin with lower viscosity and lower dielectric constant than the epoxy resin is promising as an insulating material for the next generation high voltage equipment.

DOI： 10.1109/CEIDP.2018.8544821

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Basic Study on Partial Discharge Detection with High Sensitivity using Ferrite Core 査読有り

H.Yoshikawa, S.Masuda, Y.Nakano, M.Kozako, M.Hikita, T.Mawatari, T.Matsumoto

The 2018 International Conference on Condition Monitoring and Diagnosis (CMD2018) ( P62 ) 2018年09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）

Australia Perth 2018年09月23日 - 2018年09月26日

© 2018 IEEE. Recently, deterioration of insulation in power equipment such as power cables due to partial discharge (PD) can give rise to crucial accident in power systems. To prevent serious failures in power equipment, on-site monitoring and early PD detection is important. In the present study, a new PD detection method using ferrite core (FC), which is inexpensive and easy to install, is proposed. FC is generally used to remove high frequency noises using its resistance component increasing with the frequency. As basic study on PD detection with various kinds of FCs, the frequency dependence of impedance was investigated. As a result, FC was found to provide much higher PD detection sensitivity than a high frequency current transformer (HFCT). The number of FC installed and its type were also found to give a great influence on the sensitivity and frequency band in PD detection. In conclusion, it was shown that FC is applicable for PD detection in power equipment.

DOI： 10.1109/CMD.2018.8535822

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Design and Fabrication of 3-D Cube UHF Antenna for Partial Discharge Detection 査読有り

A.Fauzan, U.Khayam, Suwarno, M.Kozako, M.Hikita

The 2018 International Conference on Condition Monitoring and Diagnosis (CMD2018) ( P68 ) 2018年09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）

Australia Perth 2018年09月23日 - 2018年09月26日

Simulation of Electromagnetic Wave and Surface Current Caused by PD for Seeking Better Detection Sensitivity by TEV Sensor Attached with a Bucket 査読有り

A.Fauzan, U.Khayam, Suwarno, H.Yoshizumi, M.Kozako, M.Hikita

The 2018 International Conference on Condition Monitoring and Diagnosis (CMD2018) ( P12 ) 2018年09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）

Australia Perth 2018年09月23日 - 2018年09月26日

© 2018 IEEE. Partial discharge (PD) is one of electrical phenomena which might occur in high voltage (HV) cable joint. Many methods have been tried to detect PD for cable joints installed in a manhole. Among them, an attempt is made to detect PD by transient earth voltage (TEV) sensor attached inside a metal bucket which is brought down into the manhole. This PD detection method can be used to diagnose the cable joint condition and to ensure safety of the personnel before entering the manhole. This paper presents simulation of electromagnetic wave emitted by PD and induced surface current flowing on the surface of the metal bucket to enhance the PD detection sensitivity. The simulation was made with a three-dimension finite difference time domain (FDTD) simulation software (CTC Co.; MAGNA TDM version 8.3) by changing the bucket depth, diameter, aperture angle and material, as well as excitation frequency of PD source and distance from the bucket. As a result, it was found that an optimal metal bucket shape providing the highest detection sensitivity in terms of the surface current is bucket with 0° aperture angle (cylindrical shape), outer diameter 300 mm, bucket depth 150 mm for iron material with 1mm in thickness under the circumstances of the manhole in which the cable joints are installed.

DOI： 10.1109/CMD.2018.8535615

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Partial Discharge Location in Cast Resin Transformer by Multiple Small Loop Sensors 査読有り

T.Fujimura, S.Masuda, Y.Nakano, Μ.Kozako, Μ.Hikita, Y.Nakamura, K.Iida, T.Umemura, T.Maeda, M.Higashiyama

The 2018 International Conference on Condition Monitoring and Diagnosis (CMD2018) ( P64 ) 2018年09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）

Australia Perth 2018年09月23日 - 2018年09月26日

© 2018 IEEE. In epoxy cast resin power apparatus, there exist unexpected insulation defects of voids and delamination. Existence of such defects can generate partial discharge (PD) with degradation of the epoxy, which eventually leads to electrical breakdown with crucial damage to the insulation systems. Thus, early PD detection and specifying the location for such defects is important. This study presents PD location in epoxy cast resin transformer of rated voltage of 6.6 kV by detecting electromagnetic (EM) wave emitted by PD using several small loop sensors. As a result, it was found that the signal intensity and arrival time difference of EM wave detected with two loop sensors can confine the defect area. Furthermore, the arrival order of EM waveforms by sensor position was measured using arrayed four loop sensors, which can locate PD in more detail. Other experimental results on PD location using X-ray irradiation to the cast resin transformer including voids was found to correspond to that provided by the present four loop sensors' PD location method. In addition, the advantage of defect location of LS was confirmed by comparison with other sensors.

DOI： 10.1109/CMD.2018.8535916

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Estimation of Internal Pressure of Vacuum Interrupter by Measuring Partial Discharge Current 査読有り

Y.Nakano, S.Masuda, M.Kozako, M.Hikita, T.Tanaka, M.Kobayashi

28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV2018) 2 611 - 614 2018年09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）

Germany Greifswald 2018年09月23日 - 2018年09月28日

© 2018 IEEE. Loss of vacuum in vacuum interrupter (VI) is becoming an interesting theme for VI used in medium voltage range beyond its lifetime of typically 20-30 years. The early detection of abnormality in the vacuum insulated equipment must be important for the development of higher voltage vacuum circuit breakers (VCBs), such as cubicle type gas insulated switchgear (C-GIS) with compressed gas and/or insulation gas. In the present study, for the purpose of diagnosing the vacuum pressure in VI by a partial discharge (PD) measurement, PD characteristics in medium vacuum range of 1 Pa to 100 Pa were investigated. As a leakage gas, air was sealed into the VI, and its pressure was regulated from 2.2 Pa to 100 Pa, which corresponds to the left region of Paschen curve. From PD current waveforms by detecting resistor connected to plane electrode outside the VI, the charges, occurrence frequency and phase characteristics of PDs for each applied AC voltage and internal vacuum pressure were determined. It was concluded that a number of occurrence of PD and PD charges would be dominant parameter for determination of the internal pressure of VI.

DOI： 10.1109/DEIV.2018.8537045

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Discussion on Partial Discharge Measurement Technique of Cable Joint in Three Phase High Voltage Overhead Transmission Line 査読有り

S.Masuda, T.Fujimura, Y.Nakano, M.Kozako, M.Hikita, H.Haruyama, K.Miyazaki, H.Sat, F.Aono

The 2018 International Conference on Condition Monitoring and Diagnosis (CMD2018) ( P61 ) 2018年09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）

Australia Perth 2018年09月23日 - 2018年09月26日

© 2018 IEEE. Cable joint in high voltage overhead transmission line connecting a pole transformer is one of the important accessories. Reliable diagnostic technique for possible insulation failures in cable joint due to the long-term operation and aging is required. The purpose of this research is to establish the insulation diagnostic technique for the cable joint by measuring partial discharge (PD), which is a precursor phenomenon of dielectric breakdown. In this paper, PD signals in three-phase high voltage overhead transmission lines with 6.6 kV cable joints, actually used in electric power company, were measured by using various sensors, i.e., high frequency current transformer (HFCT), monopole antenna, and transient earth voltage (TEV) sensor. As a result, it is shown that HFCT shows the highest sensitivity for PD detection among three kinds of sensors. It is also shown that the arrival time difference of the PD signals detected by several HFCTs enables to determine the PD source in neighboring two utility poles. Furthermore, the intensity and the polarity of first arrival part of the PD signals detected by several HFCTs enable to determine the PD source in a particular cable joint among the three ones in a utility pole.

DOI： 10.1109/CMD.2018.8535875

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Determination of Type of Partial Discharge in Cubicle-Type Gas Insulated Switchgear (C-GIS) using Artificial Neural Network 査読有り

T.R.Sukma, U.Khayam, Suwarno, R.Sugawara, H.Yoshikawa, M.Kozako, M.Hikita, O.Eda, M.Otsuka, H.Kaneko, Y.Shiina

The 2018 International Conference on Condition Monitoring and Diagnosis (CMD2018) ( P10 ) 2018年09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）

Australia Perth 2018年09月23日 - 2018年09月26日

© 2018 IEEE. Partial discharge (PD) measurement is performed as one of diagnostic tool for condition monitoring in cubicle-type gas insulated switchgear (C-GIS). This paper presents artificial neural network (ANN) to identify the type of PD occurring in C-GIS. PD measurement results obtained from C-GIS in a field were fed to the ANN as input parameters to determine the type of PD or external noises. The C-GIS consists of two compartments of power cables and two compartments of transformers. PD measurements were conducted in the C-GIS using a commercial PD measurement system consisting of an oscilloscope and three different kinds of sensors (transient earth voltage sensor, surface current sensor and high frequency current transformer) to generate input signal waveform parameters for ANN (field data). An attempt was made to locate the PD source using the output of the sensors set at different sites. PD measurements using four kinds of artificial PD sources were also conducted in laboratory using the same PD measurement system to obtain another signal waveform parameters (laboratory data) which were used for training the ANN. Thereafter, an attempt was also made to identify PD source occurring in C-GIS using field data as input for the trained ANN. As a result, the developed ANN was found to predict the kind of PD source as void-discharge with 99% probability.

DOI： 10.1109/CMD.2018.8535657

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Determination of Partial Discharge Location in Stator Core using Loop Sensors 査読有り

J.Maki, T.Kubo, T.Matsuzoe, Y.Nakano, M.Kozako, M.Hikita, T.Ueno, J.Sun, A.Izumi, K.Karasawa

The 2018 International Conference on Condition Monitoring and Diagnosis (CMD2018) ( P175 ) 2018年09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）

Australia Perth 2018年09月23日 - 2018年09月26日

© 2018 IEEE. Inverter drive motors with higher voltage, higher-speed switching and efficiency are required in various industrial sectors. The problem in inverter drive motors is the inverter surge voltage due to high-speed switching, which can cause partial discharge (PD) and degradation of insulation performance of motors. The purpose of present research is to establish the diagnostic technique for high voltage equipment, based on PD detection by loop sensors. Determination of a PD location in an actual stator core provides its optimal insulation design. In the present paper, the PD location in an actual stator core was determined by detecting the electromagnetic (EM) wave using several loop sensors, located in the depth direction and the circumferential direction of the actual stator core. As a result, the arrival time difference of EM wave was measured at each sensor. The arrival time of EM wave was calculated by cumulative energy method. It can be seen EM waveform arrival time difference method allows PD location with accuracy of 1/48 in the actual stator core.

DOI： 10.1109/CMD.2018.8535958

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Consideration of Generation Mechanism of Low Frequency Component of Partial Discharge Signal Detected by Transient Earth Voltage 査読有り

H.Yoshizumi, Y.Nakano, M.Kozako, M.Hikita, Y.Fujii, Y.Nakamura, H.Cho

The 2018 International Conference on Condition Monitoring and Diagnosis (CMD2018) ( P63 ) 2018年09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）

Australia Perth 2018年09月23日 - 2018年09月26日

© 2018 IEEE. Transient earth voltage (TEV) detection method is drawing attention for its readiness to be installed just on the outer wall of existing equipment, and is useful for partial discharge (PD) detection. The purpose of this research is to establish reliable insulation diagnosis technique of high voltage equipment based on partial discharge detection using TEV method. Our previous study showed that TEV sensor dominantly detects high (several 100 MHz) and low frequency (several 10 MHz) components attributed to the electromagnetic wave propagating through space and discharge current flowing through the ground line, respectively. To investigate a mechanism of generated low frequency components further, this paper deals with the effect of the length of PD measurement circuit on the low frequency component detected by TEV sensor by experiments and simulation of electromagnetic wave propagation using finite difference time domain (FDTD) method. As a result, it was found that the low frequency component includes two different kinds of dominant resonance frequencies determined by assuming the measurement circuit to act as a lumped constant electric circuit and as an antenna such as dipole antenna and loop antenna.

DOI： 10.1109/CMD.2018.8535989

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Classification of Partial Discharge Sources using Waveform Parameters and Phase-Resolved Partial Discharge Pattern as Input for the Artificial Neural Network 査読有り

T.R.Sukma, U.Khayam, Suwarno, R.Sugawara, H.Yoshikawa, M.Kozako, M.Hikita, O.Eda, M.Otsuka, H.Kaneko, Y.Shiina

The 2018 International Conference on Condition Monitoring and Diagnosis (CMD2018) ( P9 ) 2018年09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）

Australia Perth 2018年09月23日 - 2018年09月26日

© 2018 IEEE. Partial discharge (PD) is one of electrical phenomena which might occur in high voltage (HV) equipment and can be used for diagnosing the condition of the equipment. Artificial neural network (ANN) is then utilized to classify PD source in HV equipment. PD measurements were conducted to generate waveform parameters in laboratory using four kinds of artificial PD sources, three kinds of noise sources by three kinds of sensors (transient earth voltage (TEV) sensor, surface current sensor (SCS) and high frequency current transformer (HFCT)). Nine waveform parameters from one PD event were used for training and testing the ANN (ANN- WP). For further comparison, phase-resolved partial discharge (PRPD) pattern was also generated and used as input data for training and testing the other ANN (ANN-PR). Results reveal that ANN- WP provides >96% of recognition rate while ANN-PR gives >90% of recognition rate. Furthermore, the ANNs are then tested using new different artificial void defect. The results show that the ANN- WP predicted new PD data as void defect with 92 % probability while the ANN-PR prediction probability was found 96%. These results indicate that the waveform parameters can be used as an input data for ANN as well as PRPD pattern to provide sufficient accuracy for identifying the PD source. The results suggest a possibility that developed ANNs can be used as a decision-support tool in HV equipment diagnosis by comparing PD data obtained in the field.

DOI： 10.1109/CMD.2018.8535675

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モールド変圧器の交流部分放電特性に及ぼす雷インパルスプレストレスの影響査読有り

丸山裕史, 松尾賢介, 小迫雅裕, 匹田政幸, 飯田和生, 梅村時博, 中村勇介, 中前哲夫, 前田照彦, 東山雅一

電気学会論文誌A 138 ( 8 ) 422 - 427 2018年08月

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