研究者詳細 - 大塚　信也

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Difference in Differential and Common Mode Currents of Output and Input Cables in Three-Phase Variable Speed Drive System for Evaluating Radiated EMI 査読有り国際誌

Bandi T., Odera F., Ohtsuka S.

Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC 2537 - 2542 2024年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The issue of electromagnetic interference (EMI) holds significant importance in the design of variable speed drives (VSDs). Even if the VSD is the source of radiated EMI due to the high-speed switching devices, the power cables are the main emission parts for the radiated EMI as antennas. The common-mode (CM) current of an output power cable of the VSD has been investigated as a radiation part. However, considering the radiation EMI, it is crucial to examine the CM current not only in the output power cable but also in the input power cable. This paper investigates the differential-mode (DM) and CM currents of input and output power cables of a three-phase AC/DC/AC VSD system using simultaneous time domain measurements to estimate the radiated EMI. The result demonstrated that the input and output power cables act as antennas, and the radiated EMI can be evaluated by considering the integrated CM currents of the input and output power cables, especially the comprised of the 3-phase wire and earth wires' CM current.

DOI： 10.1109/APEC48139.2024.10509273

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Change in Electric Power Consumption in Mongolia in 2020 and the Impact of the COVID-19 Pandemic 査読有り国際誌

Tsolmon Myagmarjav, Tuvshinbayar Bandi, Bat-Erdene Bayar, Shinya Ohtsuka

Journal of Energy Transition 1 ( 1 ) 1 - 6 2023年12月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper deals with the change in electric power (EP) consumption in Mongolia in 2020 based on data on the maximum and minimum EP consumption a day, provided by NPTG. The changes in EP consumption in Mongolia in detail as weekly or seasonal changes as well as the impact of the COVID-19 pandemic have not been clear, even though annual EP consumption was provided from the reports of the World Bank, IEA, and other international institutes as statistical data. Differences in the maximum average hourly and the minimum EP consumption in a day was 277 MWh (30.2%) and in the maximum and minimum daily EP consumption in 2020, which appeared in winter and summer, respectively, was 933 MWh (71.3%). Also, a 104-MWh (14.8%) drop was confirmed on special days like Naadam. To discuss the impact of COVID-19, the values of 2017 were used as a criterion for a year absent of a pandemic, and the stringency index, an indicator used to quantify the severity and stringency of government policies and measures, was introduced, and compared with the monthly EP consumption in 2020. The COVID-19 pandemic decreased the EP consumption of 40 MWh (2 to 6%) except in December due to the free-electricity policy. The EP consumption showed the dependency of the stringency index, particularly a clear drop over 50 of the index values. These new findings of EP consumption properties are expected to apply EP demand forecasting and make design plans for

DOI： 10.59264/jet.v1i1.33

Kyutacar

鉱油中PD 電流波形の超広帯域計測–脱気状態と極性効果の相違– 査読有り

大塚信也,　福崎稔,　芝田拓樹

電気学会論文誌B ( 電気学会 ) 142 ( 11 ) 2022年11月

Changes in Electric Power Demands of Mongolian and Japanese Local Areas in 2020 and Discussion on Seasonal Electricity Usage Based on the Temperature Dependence 査読有り国際誌

Myagmarjav T., Bandi T., Bayar B.E., Ohtsuka S.

2022 9th International Conference on Condition Monitoring and Diagnosis, CMD 2022 355 - 359 2022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）

Electric power demand (EPD) varies depending on weather conditions, social activity, industrialization, and so on. For reliable operation of the electric power system, including renewable energy (RE) sources, it is necessary to monitor the EPD for generation and weather conditions to forecast the EPD as well as the generation of the RE sources. Since there were few studies on EPD changes over time or with weather conditions in Mongolia, it is necessary to clarify the change in EPD and the relationship between the EPD and temperature that is representative of the weather condition for future monitoring of the EPD and the weather condition. The authors are also interested in identifying differences in EPD change between Mongolia and Japanese characteristics. As a result, the linear relation between EPD and temperature was seen in Mongolia, while 'U-shape' characteristics in Japan. Also, differences in electricity usage between summer and winter seasons were clearly seen as the term for premature dependence.

DOI： 10.23919/CMD54214.2022.9991573

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Rise Time Characteristics on the Order of Picoseconds of Negative PD Current Pulses in SF<inf>6</inf>Gas and Mineral Oil and Impact of PD-Emitted em Waves on the 5G Frequency Band 査読有り国際誌

Ohtsuka S., Yamauchi T., Shibata H.

2022 9th International Conference on Condition Monitoring and Diagnosis, CMD 2022 154 - 158 2022年11月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

This paper deals with very steep rise time characteristics with pico-seconds of negative PD current pulse in SF6 gas and mineral oil by changing the electric utilization factor. The minimum rise time measured in mineral oil was 8.77 ps. Based on the measurement results, the frequency properties of PD-emitted EM waves in mineral oil and SF6 gas were discussed by modifying the PD current waveform with a Gaussian pulse from the viewpoint of their impact on 5G communications.

DOI： 10.23919/CMD54214.2022.9991671

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Radiated Noise Properties from Inverter Unit Considering Antenna Height Dependency and Reflection Effects in Semi-Anechoic Chamber 査読有り国際誌

Odera F., Bandi T., Kinoshita S., Ohtsuka S.

2022 International Conference on Electrical Machines and Systems, ICEMS 2022 2022年11月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Switching operation of semiconductor devices used in power electronics equipment generates electromagnetic (EM) noise, which may cause a malfunction in around equipment. In addition, power electronics equipment must meet electromagnetic compatibility (EMC) requirements. However, it is difficult to design power electronics equipment with suppressing EM noise due to its complex structure. In order to clarify the radiated EM noise properties from power electronics equipment, this paper presents the polarization and reflection effects of the radiated EM noise and the directivities of an inverter unit based on the 10 m far-field measurements in the semi-anechoic chamber.

DOI： 10.1109/ICEMS56177.2022.9983066

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Partial Discharge Current and Electromagnetic Wave Properties in Gas Mixtures of Electronegative Gas and Natural-origin Gases: Study on Applicability of UHF Method 査読有り国際誌

Shintake M., Mastuoka T., Inami K., Hama H., Nakadai Y., Ohtsuka S.

2022 9th International Conference on Condition Monitoring and Diagnosis, CMD 2022 644 - 648 2022年11月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Lots of studies on SF6 alternative gases have been carried out to avoid global warming, and not only natural-origin gases excluding strong electronegative gases, but also new gas mixtures including C5-FK, and C4-FN, as strong electronegative gases with buffer gases such as carbon dioxide, oxygen, or air were investigated due to their good insulation performance and comparably low global warming potential (GWP). So far the authors have investigated partial discharge (PD) properties like PD current and PD-emitted electromagnetic (EM) waves of SF6/dry air mixtures at 0.1 MPa with changing the SF6 gas mixture ratio as well as with two antennas having the bandwidth of the UHF or VHF bands. It revealed that the peak to peak amplitude of the PD-emitted EM waves measured with the UHF band antenna increased with an increase in the SF6 mixing ratio while those with the VHF band antenna decreased. In this study, properties of PD current and PD-emitted EM waves of SF6/dry air mixture over 0.1MPa were investigated by changing the SF6 gas mixture ratio and with the UHF and VHF antennas, and compared with those at 0.1 MPa. As a result, PD current peak decreased with an increased in gas pressure and detection of PD-emitted EM waves became more difficult with increase in the gas pressure.

DOI： 10.23919/CMD54214.2022.9991480

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Influence of Mixing Ratio Change of SF6 Alternative Gas Mixtures Considering Synergy Effect of Critical Electric Field Strength 査読有り国際誌

Ohtsuka S., Matsuoka T., Shintake M., Inami K., Hama H., Nakadai Y.

2022 9th International Conference on Condition Monitoring and Diagnosis, CMD 2022 202 - 206 2022年11月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

This paper described influences of gas mixture ratio change of SF6 alternative gas mixtures on insulation performance in view of gas handling in GIS application. The mixture ratio dependence of critical reduced electric field strength (E/N)crit was introduced as insulation performance, and formulated considering synergy effect to compare the insulation performance between the gas mixtures.

DOI： 10.23919/CMD54214.2022.9991699

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Identification of Gas Compartment Existing PD in a Series Three Phase-Type GIS Considering Propagation Properties of PD-Emitted Electromagnetic Wave by FDTD Analysis 査読有り国際誌

Taketomi Y., Fujimoto T., Ohtsuka S., Shikura T.

2022 9th International Conference on Condition Monitoring and Diagnosis, CMD 2022 640 - 643 2022年11月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

This paper described identification method of the gas component existing a PD source in a series three phase GIS based on arrival time relation and waveform characteristic of PD-emitted EM wave between sensors by FDTD analysis.

DOI： 10.23919/CMD54214.2022.9991736

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Detection Properties of Partial Discharge-emitted Electromagnetic Waves in Silicone Gels during the Electric Trees Development to Breakdown 査読有り国際誌

Kinoshita S., Oishi Y., Ohtsuka S.

2022 9th International Conference on Condition Monitoring and Diagnosis, CMD 2022 662 - 665 2022年11月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

In this study, the electromagnetic (EM) waves radiated by partial discharges from the electrode system placed in two types of silicone gels were measured with two different antennas with different bandwidths. The results showed that the EM waves radiated by partial discharge (PD) during electrical tree progression could be obtained in each gel, and that amplitude of the EM waves differed depending on the antenna type as well as the gel type. This result suggests that frequency bandwidth of the sensor or antenna should be selected to detect the EM waves radiated by PDs in gel insulator effectively.

DOI： 10.23919/CMD54214.2022.9991436

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Comparison of PD Current Waveforms between Aged and New Insulation Oils and Oil Types by Super-Wideband Measurement 査読有り

Shibata H., Fukuzaki M., Matsumoto T., Ohtsuka S.

IEEJ Transactions on Power and Energy ( 一般社団法人電気学会 ) 142 ( 10 ) 482 - 489 2022年11月

担当区分：最終著者,　責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）

Liquid insulators such as mineral oil and silicone oil have excellent cooling and insulation performance, but impurities, dissolved gases and/or moisture in the liquid are known to have a significant influence on insulation performance. So far, the authors have shown that partial discharge (PD) current waveforms in mineral oil differ significantly depending on degassing treatment condition and on positive and negative polarity by super high frequency-wideband measurement. In this paper, using aged mineral oil which was used in a distribution transformer over 48 years, difference in PD current waveforms between new and aged mineral oil and between mineral and silicone oils as difference in insulation oil type were investigated by the super high frequency-wideband measurement system, so-called “SHF_PDPW system” with a 33 GHz oscilloscope. In addition, PD-emitted electromagnetic (EM) waves in those oils were measured with an antenna with sensitivity in the UHF band, and differences in the polarity and relationship between PD current and PD-emitted EM waves were investigated from the viewpoint of applicability of the UHF method.

DOI： 10.1541/ieejpes.142.482

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超広帯域計測による経年絶縁油と新油及び油種類によるPD 電流波形の比較査読有り

芝田拓樹,　福崎稔,　松本卓也,　大塚信也

電気学会論文誌B ( 電気学会 ) 142 ( 10 ) 2022年10月

Super High Frequency Wideband Measurement of Partial Discharge Current Waveform in Mineral Oil -Difference in PD Phenomena Depending on Degassing Treatment and Polarity Effect- 査読有り国際誌

Ohtsuka S., Fukuzaki M., Shibata H.

IEEJ Transactions on Power and Energy ( 一般社団法人電気学会 ) 142 ( 11 ) 561 - 567 2022年01月

担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（学術雑誌）

Liquid insulators have excellent cooling and insulation performance, but impurities and contaminants in the liquid or dissolved gases and moisture are known to have a significant influence on insulation performance. In this paper, using the Super High Frequency-wideband Partial Discharge (PD) current Pulse Waveform measurement system, “SHF_PDPW system”, that the authors have developed and applied to PD measurement in SF6 gas so far, PD current waveforms in mineral oil were investigated in detail. Differences in PD current waveforms due to degassing treatment condition of the mineral oil and polarity effect of applied voltage could be clearly clarified. These differences cannot be observed by ordinary oscilloscopes with analog bandwidths around 1 GHz, and are important findings to understand PD phenomena, which were first observed by the super-wideband measurements.

DOI： 10.1541/ieejpes.142.561

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Fundamental Study on Reflection Property of Radiated Noise against Ground Floor in Semi-Anechoic Chamber for EMC Test of Inverter 査読有り国際誌

Bandi T., Odera F., Kinoshita S., Ohtsuka S.

2022 International Conference on Electrical Machines and Systems, ICEMS 2022 2022年01月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Radiated electromagnetic (EM) noise caused by fast-changing voltage and currents is one of the important issues for developing inverters. However, the complex structure of the inverter made it difficult to investigate its radiated EM noise. The source part, radiation part, and radiation property should be considered to predict the radiated EM noise of the inverter unit. This paper deals with the polarization and reflection properties of the simple dipole model based on EM theory and experimental results in the semi-anechoic chamber to explain the radiation property of EM noise from the inverter unit.

DOI： 10.1109/ICEMS56177.2022.9983364

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Influence of SF6 gas mixture ratio in SF6/Dry air mixtures on detection properties of PD-emitted electromagnetic wave with UHF and VHF band antennas 査読有り国際誌

Takumi Matsuoka, Shinya. Ohtsuka, Kiyoshi. Inami, Hiroyuki. Hama , Youji. Nakadai

22th International symposium on High Voltage Engineering (ISH2021) 2021 ( 15 ) 1472 - 1476 2021年11月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

ONLINE ONLINE 2021年11月22日 - 2021年11月25日

This paper deals with influences of SF6 gas mixture ratio on detection properties of partial discharge (PD)-emitted electromagnetic (EM) wave in the SF6/dry air mixtures with the UHF and the VHF antennas in view of future diagnostic technology for gas-insulated switchgear (GIS) with new SF6 alternatives like C4-Fluoronitrile (C4-FN), C5-Fluoroketone (C5-KF) or CF3I gases used as an electronegative gas. The aim of this study is to clarify whether the UHF method for PD measurements is applicable in the new SF6 alternatives like the case in SF6.The authors selected SF6/dry air mixtures instead of such as C4-FN/dry air and C5-FN/dry air due to the difficulties of the safe handling of the gas mixtures in the university laboratory. As a basic research, properties of PD-emitted EM waves in SF6/dry air mixtures were investigated by changing the SF6 contents between 0 % and 30 %, as well as by using two different types of antennas for UHF and VHF bands.

DOI： 10.1049/icp.2022.0139

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Propagation propaties of PD-emitted electromagunetic wave in three phase encapusulated GIS with series arrangement and relation between defect position and sensor output 査読有り国際誌

Tatsuki Fujimoto, Shinya Ohtsuka, Tatsuyuki Shikura

22th International symposium on High Voltage Engineering (ISH2021) ( IET Conference Proceedings ) 2021 ( 15 ) 530 - 535 2021年11月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

ONLINE ONLINE 2021年11月22日 - 2021年11月25日

As partial discharge (PD) diagnostic for GIS, the UHF method to detect PD-emitted electromagnetic (EM) wave in the UHF band has been applied due to several advantages like sensitivity and safety as a non-contact method. So far, there were researches on the UHF method, it has not been clear for propagation properties of PD-emitted EM wave in the GIS, especially for the three-phase encapsulated type GIS due to the difficulty to evaluate influence of high voltage conductor arrangement like triangle or straight arrangement. In this paper, focusing on the straight type arrangement of the three-phase encapsulated type GIS, the authors investigated propagation properties of EM wave experimentally with a model tank and simulated PD signal and numerically with FD-TD analysis, and then compared both results. As a result, good agreement on the amplitude of detected signal between them was found, so further discussion was performed using the FD-TD analysis with changing the defect position. The simulation results showed that amplitude of the sensor output depends on the defect position, which means that one can identify the defect position based on the relation of the sensor output among the sensors.

DOI： 10.1049/icp.2022.0054

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Application of Microstrip Filter for Multiple Narrow Band Antenna to Detection of Partial Discharge 査読有り国際誌

Bandi T., Ohtsuka S

22th International symposium on High Voltage Engineering (ISH2021) ( IET Conference Proceedings ) 2021 ( 15 ) 1361 - 1365 2021年11月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

ONLINE ONLINE 2021年11月22日 - 2021年11月25日

The ultra-high frequency (UHF) antennas are used as sensors to detect electromagnetic (EM) waves emitted from partial discharge (PD) in the high voltage insulation diagnostic field. However, the UHF band includes many communication and broadcasting frequencies, such as cellular phones and Wi-Fi. The authors have developed a multiple narrow-band antenna (MNB) to detect PD signal in the UHF band without radio communication noise that corresponds to several narrowband frequencies used for mobile phones and Wi-Fi. This study proposed the filtered multiple narrow band (FMNB) antenna, which consists of a multiple-strip monopole antenna and microstrip low pass filter (LPF, fC=2GHz) on an FR-4 substrate. The microstrip LPF improves the reduction of high-frequency noises without antenna size extension, especially 2.4 GHz Wi-Fi noise. The FMNB antenna was applied to detect the PD in SF6 gas under the Wi-Fi noise emitted from a commercial drone and compared with a standard Horn antenna (HA), one of the high sensitivity wide-band antenna. The experimental results demonstrate that the FMNB antenna is suitable for PD detection in the UHF method under noisy conditions.

DOI： 10.1049/icp.2022.0130

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Detection of discharge-emitted electromagnetic wave leaked from inside the microwave oven 査読有り

Ohtsuka S., Kohara H., Furuie H.

IEEJ Transactions on Industry Applications ( 一般社団法人電気学会 ) 141 ( 9 ) 674 - 682 2021年09月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Microwave ovens (MOs) are commonly used for cooking and heating food; it uses microwaves with frequency in the 2.4 GHz band, which is one of the ISM band. However, discharge could occur inside the MO due to the formation of the high electric field by the microwaves when the tableware made of metal or decorated by metal paint, or when aluminum foil is placed inside a MO under operation. In addition, if there is food residue or food that generates flammable gas, the discharge may trigger severe ignition or combustion. Therefore, the discharge signal should be detected during the MO operation to avoid fires or accidents caused by the discharge. From this safety viewpoint, this paper described the detection properties of discharge-emitted electromagnetic (EM) waves leaked from inside the MO by using a Horn antenna placed outside the MO with a low pass filter (LPF) for eliminating the leaked microwaves. The light emission properties of the discharge, including ignition and combustion during the MO operation, were also investigated along with the discharge-emitted EM waves. As a result, it was confirmed that the discharge-emitted EM waves can be detected with the first light emission in all the tests by using the antenna with the LPF.

DOI： 10.1541/ieejias.141.674

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負極性雷インパルス電圧化のSF6ガス中部分放電のリーダ転移特性とスケーリング則査読有り

大塚信也,鈴木悠太,中山裕太

電気学会論文誌B（電力・エネルギー部門誌） ( 一般社団法人電気学会 ) 141 ( 2 ) 207 - 216 2021年02月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper described leader transition properties of propagating partial discharges (PDs) in SF6 gas under the negative standard lightning voltage application with taking into consideration of effects of Trichel pulses and displacement current flowing between the PDs intermittently generated and around the wave front of the impulse voltage. Also, the scaling laws related to critical charge amount Qcr for the leader transition, leader step length ΔL and leader step time τLD were applied to the obtained results to discuss the applicability and difference in the polarity effect. As a result, the valuable negative PD's data to allow to apply the scaling las were obtained from this study. It was revealed that the distinctive displacement current, i.e. gradient of the wave front of the impulse voltage with relatively higher amplitude, and Trichel pulses during the negative polarity discharges can affect the leader transition, and change of the capacitance by propagating PDs also affects the leader transition as well as the scaling law with a parameter of dV/dt because the displacement current flowing thorough the discharge channel is influenced by the capacitance.

DOI： 10.1541/ieejpes.141.207

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SF6ガス中のリーダ転移を含む部分放電進展現象の光学計測査読有り

大塚信也,中山裕太,鈴木悠太

電気学会論文誌B（電力・エネルギー部門誌） ( 一般社団法人電気学会 ) 141 ( 2 ) 196 - 206 2021年02月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper described optical phenomena of propagating partial discharges (PDs) including leader transition from streamer discharge in SF6 gas under positive and negative standard lightning impulse voltage. The optical measurement was performed using by special optical instruments like a framing camera composing of three ICCD cameras with optical filters to obtain spatial- or time-resolved spectroscopic images, a streak camera for a streak image or streak spectrum with a spectroscope, and a phot-multiplier tube (PMT) for light emission intensity, together with PD current and applied voltage waveform measurement by controlling the gate timing of the framing and streak cameras. As a result, typical optical properties to understand the leader transition based on stem or precursor mechanism were clarified, and optical features to identify the streamer and the leader discharge as well as the precursor that has not yet led to leader transition were found. These new findings could contribute to better understanding of PD mechanism as well as improvement of PD diagnostics of gas-insulated switchgear.

DOI： 10.1541/ieejpes.141.196

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SF6ガス中部分放電電流パルス波形のピコ秒立ち上がり時間特性とその形成メカニズム査読有り

大塚信也,小坪俊勝

電気学会論文誌A ( 一般社団法人電気学会 ) 141 ( 1 ) 40 - 47 2021年01月

担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（学術雑誌）

This paper described partial discharge (PD) current waveforms in SF gas measured with a super high frequency wideband measurement system (SHF_PDPW system) with changing the electrode system to control the electric field utilization factor in order to statistically clarify the steeped pulse properties of the negative PD current pulses with a few tens picosecond order at the rising part, i.e. the minimum measured rise time was 30ps and the averaged ones were 45ps to 513ps depending on the utilization factor. The formation mechanism of such picosecond steeped rising part was discussed based on ionization process and electron movement in the critical electric filed by taking the influence of electron mobility as well as the frequency properties of the measurement system into consideration. 6

DOI： 10.1541/ieejfms.141.40

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Partial Discharge Detection of Multiple-Narrow Band Antenna under the Radio Communication Noise 査読有り

Bandi T., Ohtsuka S.

IEEJ Transactions on Electrical and Electronic Engineering 16 ( 5 ) 715 - 721 2021年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

The ultra-high frequency (UHF) method is attempted to diagnose the insulation condition of high voltage equipment as detecting partial discharge (PD) – emitted electromagnetic (EM) wave. Although the EM wave caused by PD has broadband, the UHF band includes many communication and broadcasting line spectral frequencies, which can affect PD detection as a noise. The authors have developed the multiple-narrow band (MNB) antenna to detect discharge signals with high resistance against noisy line spectral frequencies. In this paper, the MNB antenna was applied to measure PD in SF gas and compared with a standard wide-band Horn antenna to identify the PD detection ability. Furthermore, the MNB antenna was applied to measure PD signal in SF gas under the artificial and the real communication noise to estimate the noise elimination ability of MNB antenna. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC. 6 6

DOI： 10.1002/tee.23351

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FDTD analysis on propagation and TE mode properties of PD-emitted electromagnetic wave in three-phase type GIS with a series arrangement of HVCs 査読有り

Fujimoto T., Ohtsuka S., Shikura T.

IEEJ Transactions on Electrical and Electronic Engineering 16 ( 12 ) 1687 - 1692 2021年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

This article described transverse electric (TE) mode properties of partial discharge-emitted electromagnetic wave propagating in the three-phase type gas insulated switchgear (GIS) with a series arrangement of high voltage conductors that was calculated by finite difference time domain (FDTD) method. In the calculation, comparison of TE mode properties between single and three-phase type GISs as well as discussion on influences of defect position and sensor position were carried out. Also, approximation equation was proposed to obtain the cut-off frequencies of TE modes in the three-phase type GIS. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

DOI： 10.1002/tee.23471

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FDTD analysis on propagation and TE mode properties of PD emitted electromagnetic wave in three phase type GIS with a series arrangement of HV conductors

Tatsuki Fujimoto, Shinya Ohtsuka, Tatsuyuki Shikura

12nd International Workshop on High Voltage Engineering(IWHV2020) ( IEEJ ) 2020年11月

Properties of Developing Tree in Silicone Gel Observed by High Speed Camera and Detection of Emitted Electromagnetic Waves 査読有り国際誌

Yusuke Oishi, Shinya Ohtsuka

The 8th International Conference on Condition Monitoring and Diagnosis 2020(CMD2020) ( IEEE ) 507 2020年10月

Partial Discharge Properties in XLPE Block Sample with Electric Tree Defect and Difference in Charge of PD Properties Observed between IEC60270 and the UHF Method 査読有り

Furuie H., Yamauchi T., Ohtsuka S.

Proceeding - 8th International Conference on Condition Monitoring and Diagnosis, CMD 2020 158 - 161 2020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）

2020年10月25日 - 2020年10月28日

XLPE power cables are widely used in the transmission and distribution network and required high reliability for the stable and safety operation in the power system. This paper described partial discharge properties of XLPE block sample with a needle stuck defect, which eventually initiated electric tree by applying ac high voltage, measured with two methods: one is a conventional method followed by IEC60270 standard (IEC method) and the other is the UHF method to measure the emitted electromagnetic waves. In the IEC method, the authors have used PD measurement systems (OMICRON, MPD600) and measured the signals through a high-frequency current transformer, CT, a coupling capacitor unit, CC and an HA antenna with a UHF unit. Applying the system, the phase-resolved PD pattern, and its time change pattern for the XLPE samples were observed. In the UHF method, we used the HA antenna and a MA antenna, and a digital oscilloscope. Using the fast flame function of the oscilloscope, we observed the time change of PD-emitted electromagnetic waves together with the IEC method measurement. As a result, in the IEC method, the observed signals by the CC and CT were identical in PD pattern and the intensity, and their properties changed depending on the sample condition even in the tree initiation condition. However, the remarkable change was not found during the developing tree condition. To investigate this property further, we investigated the properties by the UHF method and compared them together with the PD current waveform measurement. Based on the PD current properties, the advantage of the UHF method and problem of the IEC method were discussed so as to evaluate the PD properties even in the developing tree condition.

DOI： 10.1109/CMD48350.2020.9287248

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Developing of Multiple-narrowband Antenna to Detect Partial Discharge-emitted Signal under Radio Communication Noise Environment 査読有り

Bandi T., Tanaka M., Furuie H., Ohtsuka S.

Proceeding - 8th International Conference on Condition Monitoring and Diagnosis, CMD 2020 154 - 157 2020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）

Partial discharge (PD) detection is important for high voltage equipment to monitor insulation condition. Ultra-high frequency (UHF) antenna are used as a sensor to detect PD-emitted electromagnetic wave in the UHF band. However, some radio communication and broadcasting signals could affect PD detection as noise, having line spectra. Based on this reason, the authors developed a multiple narrowband (MNB) antenna, which can eliminate the interference of the communication frequencies, selectively. In this paper, PD detection and noise elimination abilities of the MNB antenna are investigated by measuring PD in SF6 gas under the radio communication noise. The measurement results demonstrated that the MNB antenna is suitable to detect PD under the communication noise.

DOI： 10.1109/CMD48350.2020.9287228

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Properties of developing tree in silicone gel observed by high speed camera and detection of emitted electromagnetic waves 査読有り

Oishi Y., Ohtsuka S.

Proceeding - 8th International Conference on Condition Monitoring and Diagnosis, CMD 2020 162 - 165 2020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）

We investigated tree development phenomena leading to a breakdown in silicone gel under the non-uniform electric field with a high-speed video camera. As a result, the tree developed stepwise, and its developing speed was similar with that in the silicone oil as subsonic speed. This phenomenon can be explained by that the tree (cavity) formed by discharges was a conductive condition which was supported by the result of electromagnetic waves during the tree development.

DOI： 10.1109/CMD48350.2020.9287285

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A Multiple Narrow Band Antenna for Detection of Discharge-Emitted Electromagnetic Waves for Insulation Diagnostic 査読有り

Bandi T., Ohtsuka S.

IEEJ Transactions on Electrical and Electronic Engineering 15 ( 12 ) 1751 - 1757 2020年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC. Partial Discharge (PD) detection is an effective tool to diagnose the insulation condition of high voltage (HV) equipment. Among detection methods of PD, the ultra-high frequency (UHF) method is distinguished by high sensitivity and safety operation. However, the UHF band includes many communication and broadcasting line spectral frequencies, which can be interference against the UHF method. From the point of view of the reduction of interferences, the authors proposed the multiple narrow band (MNB) antenna, which can detect PD signals with high sensitivity and eliminate the line spectral noise frequencies. In this paper, a new MNB antenna was evaluated based on fundamental properties and fabricated, then applied to detect discharge signals emitted from breakdown phenomena. The results demonstrated that the fabricated MNB antenna had a good omnidirectional radiation pattern and similar sensitivity with a standard wide-band Horn antenna. © 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

DOI： 10.1002/tee.23249

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相分離型GIS のような同軸円筒構造体におけるTEモード遮断周波数の近似解と解析解の相違査読有り

大塚信也，四蔵達之

電気学会論文誌B（電力・エネルギー部門誌） ( 電気学会 ) 140 ( 9 ) 687 - 693 2020年09月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper described difference in cutoff frequency of TEm1 modes between the conventional approximate solution followed by the radii of the inner and outer conductors and the analytic solution in the co-axial structure as a single-phase GIS. The analytic solutions were calculated by the Bessel function based on the boundary condition and confirmed the validity by the FD-TD method in the same size structure. As a result, the approximate solution for the TE11 mode is available while the higher modes above TE21 modes are not available when the difference in the inner and outer conductor radii was increased. Thus, a new approximate equation is introduced, which allows us to obtain more precise result rather than the conventional one.

DOI： 10.1541/ieejpes.140.687

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Comparison of partial discharge-emitted electromagnetic waves between CO<inf>2</inf>, dry air, N<inf>2</inf> and SF<inf>6</inf> by using FDTD analysis 査読有り国際誌

Marina Tanaka, Tomoya Shiraishi, Shinya Ohtsuka, Hiroyuki Hama, Kiyoshi Inami, Shigemitsu Okabe, Takashi Yamamoto

Lecture Notes in Electrical Engineering ( International Symposium on High Voltage Engineering (ISH2019) ) 599 LNEE 1295 - 1302 2020年01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）

Hungary Budapest 2019年08月26日 - 2019年08月30日

SF gas has been widely used in the gas-insulated switchgear (GIS) as an insulation gaseous media because of its excellent insulation and arcquenching performances. However, SF gas has the global warming potential (GWP). In view of reducing the environmental impact, researches on the SF alternatives have been carried out. Non-SF gases or gas mixtures using naturalorigin gases and fluorinated gases are highlighted as new SF alternatives, and their dielectric and arc-quenching performances as well as the EHS (Environment Health Safety) aspects are examined. The authors have focused on the natural-origin gases such as CO , dry Air and N for their very low GWP, and investigated not only their insulation performance like partial discharge (PD) inception and breakdown voltages, but also the PD-emitted electromagnetic (EM) wave properties for insulation diagnostics, under the same electrode systems along with SF . In this study, the authors investigated the PD-emitted EM waves for the SF alternatives for CO , dry Air and N and SF with the 5 different types of antennas whose frequency bands were covered from the VHF to UHF bands. The authors also analyzed the gas type and antenna type dependence of the measured PD-emitted EM waves by the FDTD method based on the PD current waveforms. It was clearly shown that the emitted EM wave properties could be understood by the nature of emission of RF signal and PD current shapes depending on the gas type. 6 6 6 6 6 2 2 6 6 2 2 6

DOI： 10.1007/978-3-030-31680-8_124

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Influences and behaviour of a water droplet on breakdown properties in the mineral oil observed by a high-speed camera and a coupled analysis of the electric field and fluid 査読有り

Yamauchi T., Shibata H., Ohtsuka S.

Lecture Notes in Electrical Engineering 599 LNEE 1266 - 1275 2020年01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）

Hungary Budapest 2019年08月26日 - 2019年08月30日

Power transformers insulated with papers and insulation oil are needed to pay an attention to water content because it is known that breakdown and partial discharge inception voltages (BDV and PDIV) could be decreased as which the water content increased. Since there is a saturation level of water content in the oil, water droplets could appear if the content level exceeded the saturation one. There are many researches on the influences of water content in the insulation oil on the PDIV or BDV as well as the movement and deformation of a water droplet under the uniform or quasi-uniform electric field. However, relationship between the water droplet behavior and breakdown phenomena under the non-uniform electric field has not been made clear. The purpose of this study is to clarify the influences and behavior of a water droplet in the mineral oil on breakdown properties. From this point of view, the authors investigated influences of the water droplet on BDV, and how the water droplet could lead to breakdown in view of its movement and deformation by the observation with a high-speed video camera. As a result, the breakdown occurred several times at once and the BDV and the breakdown path were influenced by the existence of the water droplet. Furthermore, the movement and deformation of the water droplet under the non-uniform electric filed were analyzed as a coupled analysis and compared with the high-speed camera results.

DOI： 10.1007/978-3-030-31680-8_121

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Breakdown light emission spectrum of mineral oil including a water droplet observed with a spectroscope and optical sensors attached with a colour filter 査読有り

Shibata H., Yamauchi T., Yoshida K., Ohtsuka S.

Lecture Notes in Electrical Engineering 599 LNEE 983 - 990 2020年01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）

It is well known that breakdown (BD) and partial discharge (PD) inception voltages in mineral oil could be decreased as which water content increased. The authors have investigated influences of water content in the mineral oil on the PD and BD properties, together with the movement and deformation of a water droplet leading to BD by a high-speed video camera. In this study, the author investigated light emission properties of the mineral oil at BD observed by the high-speed video camera and a spectroscope with taking influences of the water droplet into consideration. The BD took place intermittently many times at once in the same path that was formed along with the enlarging water droplet. At this time, changes of the light emission color in the BD path was clearly observed, which seemed to correspond to optical wavelengths (colors) of line spectra of hydrogen; Hα, Hβ and Hγ, as well as band spectra of molecules related to C and CH system. In order to confirm these spectra, the authors observed the wavelengths with the spectroscope during the BDs. Also, the authors constructed a new optical measurement system with photo-multiplier tubes (PMTs) that were attached with a color filter to enable to selectively measure the time-change of the spectrum intensity. These results are expected to become a basic data and would be applied to the condition monitoring of oil-insulated high voltage apparatus such as power transformers and bushings.

DOI： 10.1007/978-3-030-31680-8_95

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Spectroscopic Techniques to Evaluate an Ignitable Spark from a CFRP Specimen with a Fastener Under the Lightning Strike Test 査読有り国際誌

Shinya Ohtsuka, Shouichi Kamoda, Kou Tokumasu, Takayuki Nishi

International Conference on Lightning and Static Electricity（ICOLSE）2019 No.88 2019年09月

Relationship Between Spark Direction and Carbon Fiber Direction from a Fastener Jointed CFRP structure 査読有り国際誌

K. Tokumasu, T. Yamauchi, Y. Oisi, S. Ohtsuka, T. Nishi

International Conference on Lightning and Static Electricity（ICOLSE）2019 No.90 2019年09月

Breakdown Light Emission Spectrum of Mineral Oil Including a Water Droplet Observed with a Spectroscope and Optical Sensors Attached with a Color Filter 査読有り国際誌

Hiroki Shibata, Tatsuhiro Yamauchi, Keisuke Yoshida, Shinya Ohtsuka

Proceedings of the 21st International Symposium on High Voltage Engineering ( 935 ) 2019年08月

Construction of the SHF Test Apparatus to Measure the Partial Discharge Current Waveforms in the Practical Operation Conditions of Power Transformer and Application to Influence of BTA Addition 査読有り国際誌

Shibata H., Kotsubo T., Yamauchi T., Ohtsuka S.

2018 IEEE Electrical Insulation Conference, EIC 2018 182 - 185 2018年10月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. Insulation diagnosis and partial discharge (PD) test have been performed from the viewpoint of operational reliability and quality evaluation of high-voltage electrical power apparatus. The Ultra high frequency (UHF) method that measures the PD-emitted electromagnetic (EM) waves with UHF band (0.3-3 GHz) components is known as one of powerful methods of insulation diagnosis based on PD detection for highvoltage electrical power apparatus. To improve the UHF method, accurate measurement of PD current pulse is quite important because the PD current is a radiation source of the EM wave. Therefore, we have developed the SHF-PDPW (super high frequency wideband PD current pulse waveform measurement) system that enables us to obtain accurately waveforms up to SHF band (3-30 GHz). Using this system, we have investigated PD characteristics such as PD current pulse waveforms in mineral oil used as insulation oil for transformer. As a result, this system could observe the PD phenomena which were a few tens picoseconds order rise time, i.e. undetectable ones in the conventional measurement band. It is necessary to investigate the insulation oil considering practical operation conditions such as degassing, oil temperature change, generation of the combustible gas by discharge and heating oil, addition of additives like 1,2,3-benzotriazole (BTA) and so on, in order to improve the operation method and the reliability of it. In this study, we constructed the new experimental system which could investigate PD properties under the practical conditions of the power transformer. Then, as a first step, we investigated influence of BTA additive on PD characteristics of insulation oil measured by the SHF-PDPW system. BTA has been widely used in transformer oil in Japan. The BTA addition was specified in the Japanese standard (JIS C 2320) in 1988 in order to decrease electrostatic charging. As a result, it could be confirmed that the usefulness of developed experimental system and the influence of BTA additive on PD characteristics.

DOI： 10.1109/EIC.2018.8481039

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研究グループ紹介：九州工業大学高電圧電気絶縁・電磁環境研究室（大塚研究室）招待有り

大塚信也

電気学会論文誌．　Ｂ ( 一般社団法人電気学会 ) 138 ( 5 ) NL5_2 - NL5_2 2018年01月

Properties of Electrostatic Discharge from a Charged Glass Body　Moving to the Ground Plate 査読有り

Kenta Tagami, Shinya Ohtsuka, Kenichi Kawabe

The International Conference on Lightning & Static Electricity 2017(ICOLSE2017), 1C1-2 2017年09月

Influences of Lightning Strike on Electrical Insulation and　Absorption Properties of Radio Wave Absorbers　for the GHz Frequency Band　査読有り

S. Ohtsuka, K. Tagami, Y. Okura, T. Tabata , K. Kubo

The International Conference on Lightning & Static Electricity 2017(ICOLSE2017), 2C1-3 2017年09月

絶縁診断技術の高度化に向けた部分放電電流パルス波形の超広帯域計測技術～PM2.5 を含む大気汚染評価に向けた気中放電への適用～

大塚　信也

電気評論 ( 電気評論社 ) 101 ( 11 ) 72 - 76 2016年11月

Partial Discharge Current and Emitted Electromagnetic Waves Measured with the VHF/UHF Methods between N2, CO2, Dry Air and SF6 at Partial Discharge Inception Voltage 査読有り

S. Ohtsuka, T. Sonoda, T. Shiraishi, K. Inami, H. Hama, G. Ueta, S. Okabe

21th International Conference on Gas Discharges and their Applications 297 - 300 B5 2016年09月

Investigation of DC corona discharge properties using UHF method 査読有り

Nugraha F., Harid N., Sayari N., Barkat B., Ohtsuka S., Harada K., Okura Y., Sonoda T.

Proceedings - 5th International Conference on Electrical Engineering and Informatics: Bridging the Knowledge between Academic, Industry, and Community, ICEEI 2015 171 - 176 2015年12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）

© 2015 IEEE.Partial Discharge (PD) measurement is well known as powerful method to identify the condition of high-voltage insulation. This paper investigates the properties of the ultra-high frequency (UHF) electromagnetic (EM) wave emanating from the air discharge (corona) under high voltage DC source. By applying both positive and negative high voltage DC ranging up to 135 kV, a rod antenna and a horn antenna were used as UHF sensors to detect any EM wave emission from PD activity and breakdown in air insulation. The experiment results show that typical PD emission signals under positive DC have higher voltage amplitude and wider burst width pulses than the typical PD emission signals under negative DC. Moreover, it is found that the first-peak of EM wave emission under positive DC has negative polarity while under negative DC has positive polarity. In addition, FFT analysis shows that this typical air discharge has dominant amplitude in frequency bands below 250MHz. Another significant result of this experiment is the inability of the horn antenna to detect the EM emission from air discharge.

DOI： 10.1109/ICEEI.2015.7352490

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Investigation of DC corona discharge properties using UHF method 査読有り国際誌

Nugraha, F.A.Email Author, Harid, N., Sayari, N.A., Barkat, B., Ohtsuka, S.Email Author, Harada, K., Okura, Y., Sonoda, T.

5th International Conference on Electrical Engineering and Informatics ( Institute of Electrical and Electronics Engineers Inc. ) 171 - 176 2015年12月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Indonesia Jayakarta 2015年08月10日 - 2015年08月11日

Partial Discharge (PD) measurement is well known as powerful method to identify the condition of high-voltage insulation. This paper investigates the properties of the ultra-high frequency (UHF) electromagnetic (EM) wave emanating from the air discharge (corona) under high voltage DC source. By applying both positive and negative high voltage DC ranging up to 135 kV, a rod antenna and a horn antenna were used as UHF sensors to detect any EM wave emission from PD activity and breakdown in air insulation. The experiment results show that typical PD emission signals under positive DC have higher voltage amplitude and wider burst width pulses than the typical PD emission signals under negative DC. Moreover, it is found that the first-peak of EM wave emission under positive DC has negative polarity while under negative DC has positive polarity. In addition, FFT analysis shows that this typical air discharge has dominant amplitude in frequency bands below 250MHz. Another significant result of this experiment is the inability of the horn antenna to detect the EM emission from air discharge. © 2015 IEEE.

DOI： 10.1109

Estimation of spark ignition phenomena on CFRP specimen with a fastener by a novel optical system in the ignitable mixture test method 査読有り

Shinya OHTSUKA, K Matsushita, T Fuchizaki, R Abe, T Nishi

the International Conference of Lightning & Static Electricity (ICOLSE) TOU15-83 2015年09月

SUPER HIGH FREQUENCY COMPONENTS OF PARTIAL DISCHARGE CURRENT PULSE WAVEFORMS AND THE EMITTED ELECTROMAGNETIC WAVES MEASURED WITH THE SHF_PDPW SYSTEM 査読有り

Keisuke Yoshida, Takuya Matsumoto, Wataru Tomoeda, Shinya Ohtsuka

The 19th International Symposium on High Voltage Engineering(ISH2015) 436 2015年08月

BREAKDOWN AND PARTIAL DISCHARGE INCEPTION CHARACTERISTICS IN N2, CO2, DRY AIR AND SF6 AT LIGHTNING IMPULSE VOLTAGE 査読有り

T. Sonoda, S. Ohtsuka, K. Inami, H. Hama, G. Ueta, S. Okabe

The 19th International Symposium on High Voltage Engineering(ISH2015) 222 2015年08月

STEEP RISE TIME PROPERTIES OF PD CURRENT PULSE WAVEFORM IN GASEOUS AND OIL INSULATIONS MEASURED WITH THE SHF_PDPW SYSTEM 査読有り

Wataru Tomoeda, Takuya Matsumoto, Keisuke Yoshida, Shinya Ohtsuka

The 19th International Symposium on High Voltage Engineering(ISH2015) 434 2015年08月

Estimation of spark ignition phenomena on CFRP specimen with a fastener by a novel optical system in the ignitable mixture test method 査読有り

Ohtsuka S., Matsushit K., Fuchizaki T., Abe R., Nishi T.

IET Seminar Digest 2015 ( 11 ) 2015年01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）

© 2015, Institution of Engineering and Technology. All rights reserved. This paper deals with spark phenomena in the ignitable mixture gas including 6% hydrogen not only from a CFRP specimen with a fastener in the lightning strike test where the compound current waveforms of "Component A, B and C" were used, but also from an electrode gap system in the 200uJ voltage spark test, which were observed by a novel optical system with PMTs, optical fibers, digital cameras and a spectroscope. We investigated the relationship between spark generation and explosion, i.e. ignition, based on the measured optical signals, especially the time integral value of the spark light emission intensity Lint that derives the spark energy.

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Difference in Detected PD-emitted Electromagnetic Waves in Atmospheric Air and Insulation Oil by Antenna Type 査読有り

Yasuyuki Ohkura, Toshitake Umegane, Ryota Fuchi, Shinya Ohtsuka, Akira Taguchi, Yosuke Hashimoto

2014 IEEE International Conference on Condition Monitoring and Diagnosis(CMD2014) ( OB1-03 ) 2014年09月

Influences of the Measurement Frequency Bandwidth on PD Current Pulse Waveforms and Emitted EM Waves in Mineral Oil with the SHF_PDPW System 査読有り

Takuya Matsumoto, Minoru Fukuzaki, Shinya Ohtsuka

2014 IEEE International Conference on Condition Monitoring and Diagnosis(CMD2014) ( OB1-06 ) 2014年09月

Flashover Voltage Properties Between Foil Electrodes Formed on the Printed Wiring Board under the ESD Test 査読有り

Tomohito Kamo, Sho Iwai, Masashi Sonoda, Shinya Ohtsuka

2014 IEEE International Conference on Condition Monitoring and Diagnosis(CMD2014) ( OG-04 ) 2014年09月

NOVEL ESTIMATION METHOD OF SPARK PHENOMENA OF THE CFRP SAMPLE WITH A FASTENER BY OPTICAL MEASUREMENT TECHNIQUE UNDER LIGHTNING STRIKE TEST 査読有り

Shinya Ohtsuka, Masaaki Furukawa, Yuki Yamaguchi, Takayuki Nishi, Hiroyuki Tsubata

2013 International Conference on Lightning and Static Electricity(ICOLSE 2013) 2013年09月

APPLICATION OF NEW VISUALIZATION EQUIPMENT TO IDENTIFY THE SOURCE POSITION OF THE DISCHARGE-EMITTED ELECTROMAGNETIC WAVES TO THREE-PHASE ELECTRIC POWER APPARATUS 査読有り

R. Fuchi, H. Shibata, T. Umegane, Shinya Ohtsuka, A. Izena, H. Fukuda

18th International Symposium on High Voltage Engineering (ISH2013) PF-46 481 2013年08月

SOPHISTICATED MEASUREMENT OF PD CURRENT PULSES IN INSULATION OIL AND THE EFFECTS OF DEAERATION TREATMENT ON THE WAVEFORMS WITH THE SHF_PDPW SYSTEM 査読有り

Minoru Fukuzaki, Takuya Matsumoto, Shinya Ohtsuka

18th International Symposium on High Voltage Engineering (ISH2013) PD-44 272 2013年08月

RELATIONSHIP BETWEEN PD CURRENT PULSE WAVEFORMS AND THE EMITTED ELECTROMAGNETIC WAVES IN SF6 ALTERNATIVE GASES WITH THE SHF_PDPW SYSTEM 査読有り

M. Okamoto, S. Ohtsuka

18th International Symposium on High Voltage Engineering (ISH2013) OD3-05 205 2013年08月

DIFFRACTION PHENOMENON AND PROPAGATION PROPERTIES OF DISCHARGE-EMITTED ELECTROMAGNETIC WAVE AROUND THE OPERATING GIS EQUIPMENT 査読有り

T. Umegane, H. Shibata, R. Fuchi, S. Ohtsuka, A. Izena, H. Fukuda

18th International Symposium on High Voltage Engineering (ISH2013) OF6-01 429 2013年08月

Time sequential properties of partial discharge current pulses in SF6 gas and dry air under dc voltage application 査読有り

M. Okamoto, S. Ohtsuka

18th International Symposium on High Voltage Engineering (ISH2013) PD-41 269 2013年08月

A spatial-resolved spectroscopic measurements of PD phenomena in SF 6 gas and effects of N2 gas addition to SF6 gas on the high sensitive light emission measurement 査読有り

Yamaguchi Y., Ohtsuka S.

IEEJ Transactions on Fundamentals and Materials 133 ( 4 ) 2013年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

This paper described PD phenomena in SF6 gas with the spatial-resolved spectroscopic measurement system. The results allow us to understand where and how PDs were generated and propagated near the tip of the needle electrode and also how difference the PD light emission properties were, among the test gases. We also discussed effects of N2 addition to SF6 gas on the PD phenomena to improve the detection of light emission information. © 2013 The Institute of Electrical Engineers of Japan.

DOI： 10.1541/ieejfms.133.186

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SF6ガス中部分放電現象の空間分解分光測定とN2混合による高感度化査読有り

山口裕貴, 大塚信也

電気学会論文誌A 133 ( 4 ) 186 - 191 2013年04月

PD Current Pulse Waveforms of Environmental Friendly Gases Measured with SHF_PDPW System and the Applicability of the UHF Method 査読有り

Shinya Ohtsuka, Kohei Fukuda

2012 IEEE International Conference on Condition Monitoring and Diagnosis(CMD2012) ( G-37 ) 2012年09月

Feasibility Study on a New Visualization Technique of Discharge-emitted Electromagnetic Waves with Time-domain Measurements 査読有り

Hiroki Shibata, Toshitake Umegane, Shinya Ohtsuka

2012 IEEE International Conference on Condition Monitoring and Diagnosis(CMD2012) ( G-23 ) 2012年09月

Frequency Bandwidth Dependence of PD current Waveforms in Transformer Oil Measured with the SHF_PDPW system 査読有り

Minoru Fukuzaki, Kohei Fukuda, Shinya Ohtsuka

2012 IEEE International Conference on Condition Monitoring and Diagnosis(CMD2012) ( G-22 ) 2012年09月

Fundamental study of Evaluation Methods of the Deepness of Immersed Water in Pole Mounted Air Switch by Air-coupled Ultrasound Method 査読有り

Tomohiko Nagano, Shinya Ohtsuka

2012 IEEE International Conference on Condition Monitoring and Diagnosis(CMD2012) ( A-148 ) 2012年09月

Sensitivity comparison of disc- and loop-type sensors using the UHF method to detect partial discharges in GIS 査読有り

Hoshino T., Maruyama S., Ohtsuka S., Hikita M., Wada J., Okabe S.

IEEE Transactions on Dielectrics and Electrical Insulation 19 ( 3 ) 910 - 916 2012年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

This paper investigates the sensitivity of two UHF sensors of a disc-type measuring electrode and a loop-type measuring electrode embedded in an epoxy insulator for detecting partial discharges (PD) and for diagnosing gas-insulated switchgear (GIS). The experimental results show that the disc-type electrode has a wide frequency range up to 8 (GHz), which is advantageous for detecting a particle on an enclosure. The results also show that the loop-type measuring electrode is more sensitive to a metallic particle on a conductor than the disc-type measuring electrode. These results confirm that both disc-type and loop-type measuring electrode are capable of detecting frequency components in the UHF range or in a higher frequency band up to 8 (GHz) when the different types of defect exist inside a GIS. © 2012 IEEE.

DOI： 10.1109/TDEI.2012.6215094

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Detection of SF6 decomposition products generated by DC corona discharge using a carbon nanotube gas sensor 査読有り

Martin, Y.; Zhenyu Li; Tsutsumi, T.; Shou, R.; Nakano, M.; Suehiro, J.; Ohtsuka, S.

IEEE Transactions on Dielectrics and Electrical Insulation 19 ( 2 ) 671 - 676 2012年04月

Study of Partial Discharge Radiated Electromagnetic Wave Propagation Characteristics in an Actual 154 kV Model GIS 査読有り

Masayuki Hikita, Shinya Ohtsuka,Junichi Wada, Shigemitsu Okabe,Toshihiro Hoshino,Shiro Maruyama

IEEE Transactions on Dielectrics and Electrical Insulation 19 ( 1 ) 8 - 17 2012年02月

Gas by-products of CF3I under AC partial discharge 査読有り

Mohd Jamil M., Mohd Jamil M., Ohtsuka S., Hikita M., Saitoh H., Sakaki M.

Journal of Electrostatics 69 ( 6 ) 611 - 617 2011年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

This paper presents the decomposition by-products of trifluro-iodo-methane and their relative proportions in the gas phase under the occurrence of partial discharge. The experiment was performed in the presence of water vapor from 250 to 400 ppm under a non-uniform electric field configuration. The experimental results reveal that the by-products of C2F6, C2F4, C2F5I with the amount of 1300, 200, and 55 (CH3I) ppm, respectively, were produced for a cumulative charge of 161 mC. Other by-products, such as C3F8, CHF3, C3F6 CH3I were obtained at less than 30 ppm C2F6 was the dominant gas by-product of trifluro-iodo-methane suffering partial discharge. © 2011 Elsevier B.V.

DOI： 10.1016/j.elstat.2011.08.007

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Propagation properties of PD-induced electromagnetic wave in 66 kV GIS model tank with L branch structure 査読有り

Hikita, M.; Ohtsuka, S.; Wada, J.; Okabe, S.; Hoshino, T.; Maruyama, S.

IEEE Transactions on Dielectrics and Electrical Insulation 18 ( 5 ) 1678 - 1685 2011年10月

Partial discharge phase distribution of palm oil as insulating liquid 査読有り

Rajab A., Rajab A., Umar K., Hamdani D., Aminuddin S., Suwarno, Abe Y., Tsuchie M., Kozako M., Ohtsuka S., Hikita M.

Telkomnika 9 ( 1 ) 151 - 160 2011年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

Due to the low biodegradability level of mineral oil and its susceptibility to the fire, palm oil was proposed as alternative insulating liquid. This paper discusses partial discharge (PD) in palm oil under sinusoidal voltages and the comparison with mineral oil. PD was generated using a needle-plane electrode configuration which is enable enhancing electric field at the needle tip. PD pulses were detected using RC detector and they were measured using a Computer-based partial discharge measurement system. The results showed that PD activities in both oils are similar. The PD was initiated at the negative polarity of applied voltage. The discharges took place in both polarity's of applied voltage with PD number was higher at negative one. Several discharges phenomena showed the presence of space charge which changed electric field and governed PD activities besides the main field introduced by voltage application.

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Propagation properties of PD-induced electromagnetic wave in GIS model tank with T branch structure 査読有り

Hikita, M. ,Ohtsuka, S. ; Hoshino, T. ; Maruyama, S. ; Ueta, G. ; Okabe, S.

IEEE Transactions on Dielectrics and Electrical Insulation 18 ( 1 ) 256 - 263 2011年02月

Identification of DC corona generating SF6 decomposition gases adsorbed on CNT gas sensor using FTIR spectroscopy 査読有り

Martin Y., Li Z., Tsutsumi T., Suehiro J., Imasaka K., Ohtsuka S.

IEEE Region 10 Annual International Conference, Proceedings/TENCON 663 - 666 2010年12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）

It is important to detect decomposition of insulating gas SF6 caused by partial discharges for gas-insulated switchgear (GIS). In the previous result, the author developed a novel partial discharges sensing using carbon nanotube (CNT) gas sensor. In recently, an application of high voltage DC for long distance electric power transmission has been often used in various countries as the interconnection system and overload demand. In this study we applied the CNT gas sensor to detect partial discharges generated by high voltage DC. There was polarity profile for DC compared AC discharges. It was found, response of the sensor in the case of negative discharges was much higher than positive discharges under the same experimental condition. And the decomposed gases for each case were identified by FT-IR spectroscopy. The result indicated absorption peaks correspond to SF4 and SOF2 of positive discharges was much higher than that of negative discharges. © 2010 IEEE.

DOI： 10.1109/TENCON.2010.5686640

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Examination of single-phase partial discharge monitoring device for partial discharge diagnosis on three-phase GIS 査読有り

Khayam U., Ohtsuka S., Hikita M., Otaka N., Matsuyama T., Takehara Y.

International Journal on Electrical Engineering and Informatics 2 ( 3 ) 244 - 255 2010年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

This paper deals with partial discharge induced electromagnetic wave investigation on three-phase GIS using UHF method and the application of single-phase partial discharge monitoring device (PDM) on three-phase gas insulated switchgear (GIS). The PD source is a protrusion at different positions on the conductor or on the tank. Frequency and phase spectrums of EMW signals emitted by PD at different positions were observed. The most dominant frequency of EMW signal in three-phase GIS was estimated from the cutoff frequency (fc) formula for single-phase GIS. The main difference in frequency spectrum between three-phase and single-phase GIS was found to be the shift of fc to the lower value for three-phase GIS. The presence of three conductors can be considered as increase in an equivalent radius of three-phase conductor by a factor of 1.6 for this GIS model. The phase of PD phase pattern in the phase spectrum depended on the particle position. The PD sources on three-phase GIS were diagnosed by single-phase PDM device. The success rate of diagnosis results is low. The error is predicted to be caused by error in phase recognition of PD pattern. The change in phase shift setting of PD phase pattern in PDM device based on the phase angle of applied voltage at maximum electric field gave better diagnosis results.

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Influence of disconnecting part on propagation properties of PD-induced electromagnetic wave in model gis 査読有り

Hikita, M.; Ohtsuka, S.; Okabe, S.; Wada, J.; Hoshino, T.; Maruyama, S.

IEEE Transactions on Dielectrics and Electrical Insulation 17 ( 6 ) 1731 - 1737 2010年12月

Influence of insulating spacer type on propagation properties of PD-induced electromagnetic wave in GIS 査読有り

Hikita M., Ohtsuka S., Ueta G., Okabe S., Hoshino T., Maruyama S.

IEEE Transactions on Dielectrics and Electrical Insulation 17 ( 5 ) 1642 - 1648 2010年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

The authors have studied insulation diagnostic technique of gas-insulated switchgear (GIS) by UHF (ultra high frequency) method. In this paper, the authors investigated the effect of insulating spacer type (metal flange type (MT) or bush type (BT)) on the propagation properties of partial discharge (PD) induced electromagnetic (EM) wave in GIS with UHF method. Low pass filtering process for cutoff frequency of TE11 mode was used to eliminate the higher order mode above TE11 of detected signal. Results revealed that reduction of the magnitude of measured EM waveform by passing through spacers. The reduction was found to be not due to attenuation by the spacer, but mainly due to superimposition of reduced TE mode and TEM mode. Furthermore, the authors investigated relationship between the propagating EM wave in GIS and a leaked EM wave from a BT spacer. This result suggests that insulation diagnosis by a sensor placed outside of GIS could be carried out to detect the leaked EM wave through a BT spacer. © 2010 IEEE.

DOI： 10.1109/TDEI.2010.5595569

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Attenuation Characteristics of Electromagnetic Waves Due to Partial Discharges in a GIS Using Different Types of PD-Detecting Coupler 査読有り

T.Hoshino, S.Maruyama, T.Sakakibara, S.Ohtsuka, M.Hikita, G.Ueta, S.Okabe

International Conference on Condition Monitoring and Diagnosis (CMD2010) P1-55 862 - 865 2010年09月

Detection of SF6 deomposition gases generated by HVDC partial discharges using carbon nanotube 査読有り

Yul Martin, Zhenyu Li, Takuya Tsutsumi, Kiminobu Imasaka, Junya Suehiro, Shinya Ohtsuka

International Conference on Condition Monitoring and Diagnosis (CMD2010) P1-58 874 - 877 2010年09月

Influence of Different Diameter Bus Conductor part of GIS on Propagation Property of PD-induced Electromagnetic wave 査読有り

Masayuki Hikita, Yohei Yamamura, Nasahiro Kozako, Masayuki Hayashi, Shinya Ohtsuka, oshihiro Hoshino, Shiro Maruyama, Takaaki Sakakibara

International Conference on Condition Monitoring and Diagnosis (CMD2010) C2-1 477 - 480 2010年09月

Propagation Properties of Electromagnetic Waves Emitted by Partial Discharge in Oil for Model Transformer Tank with a Practical Coil 査読有り

M.Kozako, A.Morita, S.Ohtsuka, M.Hikita, S.Yamada, Y.Taniguchi

International Conference on Condition Monitoring and Diagnosis (CMD2010) A4-3 123 - 126 2010年09月

Switching Characteristics of SiC-VJFET and Manufacture of Inverter 査読有り

Katsuhiko Harada, Kentaro Maki, Sompathana Pounyakhet, Junichiro Tokiyoshi, Masahiro Kozako, Shinya Ohtsuka, Masayuki Hikita,

The 2010 International Power Electronics Conference,2010 ( 0424 ) 176 - 179 2010年06月

Investigation of EMTP Transformer Model for TRV Calculation after Fault Current Interrupting by Using FRA Measurement 査読有り

MYOMIN Thein, IKEDA Hisatoshi, TODA Hiroaki, HARADA Katsuhiko,OHTSUKA Shinya, HIKITA Masayuki, HAGINOMORI Eiichi, KOSHIDUKA Tadashi,

2010 Transmission and Distribution Conference and Exposision 0424 2010年04月

Corona Inception Electric Field of Arcing Horn Model by Electric Field Calculation Based On 2D And 3D Models 査読有り

Hiroyuki Shirai,Nhiarue Touamoua ,Masahiro Kozako,Masayuki Hikita,Minoru Uehara ,Yukito Tsuji,Shinya Ohtsuka

2009 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering ( OC-3 ) 126 - 129 2009年11月

Low temperature operation of Self-recovering micro fuse in liquid nitrogen and its ON resistance properties 査読有り

Shigeru Mitarai,Naoki Sugitani,Masahiro Kozako,Masayuki Hikita,Shinya Ohtsuka

2009 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering ( PB-6 ) 346 - 349 2009年11月

Preparation and Fundamental Investigation of Characteristics of Silicon Rubber Nanocomposite for Outdoor Insulation 査読有り

Masashi Higashikoji,Masahiro Kozako,Shinya Ohtsuka,Masayuki Hikita,Toshikatsu Tanaka

2009 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering ( PB-5 ) 342 - 345 2009年11月

Comparison of Partial Discharge Charge Quantity between Tio2 Filler Filled and SiO2 Filler Filled Enameled Wires Under High-frequency AC Voltage Simulating Inverter Surge Voltage 査読有り

Kouhei Yamaguchi,Masato Fujimoto,Masahiro Kozako,Shinya Ohtsuka,Masayuki Hikita,Makoto Ohya,Keiichi Tomizawa,Noriyoshi Fushimi

2009 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering ( PA-12 ) 300 - 303 2009年11月

Electromagnetic Wave Propagation Characteristics Emitted from Partial Discharge by Needle - Plane Electrode in Transformer Tank Model with Practical Coil 査読有り

Akinori Morita,Kyohei Yamada,Yutaro Abe,Masahiro Kozako,Shinya Ohtsuka,Masayuki Hikita,Shin Yamada,Yasuhiko Taniguchi

2009 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering ( PA-11 ) 296 - 299 2009年11月

Propagation properties of PD-induced Electromagnetic Wave in model 66kV GIS with T-Branch structure 査読有り

Y. Yamamura,T. Nakano,S. Ohtsuka,M. Kozako,M. Hikita,T. Hoshino,S. Maruyama,T. Sakaibara,G. Ueta,S. Okabe

2009 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering ( PA-10 ) 292 - 295 2009年11月

Gas pressure dependence of Negative Lightning Impulse PD properties in SF6 gas observed by time and spatial-resolved spectroscopic measurement system 査読有り

Yuta Suzuki,Tomoki Hara,Masaaki Furukawa,Atsushi Sogabe,Masahiro Kozako,Masayuki Hikita,Shinya Ohtsuka

2009 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering ( PA-6 ) 276 - 279 2009年11月

Investigation of PD condition in SF6 gas by image processing of spatial-resolved spectroscopic light emission images under positive lightning impulse voltage 査読有り

Tomoki Hara,Yuta Suzuki,Masayuki Hikita,Shinya Ohtsuka

2009 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering ( PA-5 ) 272 - 275 2009年11月

Identification of Propagation Path of Acoustic Wave Signals in Simulated Transformer using Wavelet Analysis 査読有り

Kyohei Yamada,Akinori Morita,Masahiro Kozako,Shinya Ohtsuka,Masayuki Hikita,Kenji Kashine,Itaru Nakamura,Hidenobu Koide

2009 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering ( OA-2 ) 79 - 82 2009年11月

Development of partial discharge location system of power cable using GPS and atomic clock 査読有り

Tomohiko Katayama,Masahiro Kozako,Shinya Ohtsuka,Masayuki Hikita,Kazutoshi Abe,Hiroshi Suzuki

2009 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering ( PA-4 ) 268 - 271 2009年11月

BreakdownMechanism in C3F8/CO2 Gas Mixture under Non-uniform Field on the Basis of Partial Discharge Properties 査読有り

Masayuki Hikita,Shinya Ohtsuka,Shigemitsu Okabe,Genyo Ueta

IEEE Transactions on Dielectrics and Electrical Insulation 16 ( 5 ) 1413 - 1419 2009年10月

Investigation of Transuformer Model for TRV Calculation by EMTP 査読有り

M.M.Thein, H.Ikeda, K.Harada, S.Ohtsuka, M.Hikita, E.Haginomori, T.Koshiduka

IEEJ Trans. on PE (電気学会論文誌B) 129 ( 10 ) 1174 - 1180 2009年10月

Rersearch on Acceleration Phenomena with Test equipment of simulating Puffer type Gas Circuit Breaker 査読有り

H.Ikeda, S.Kawachi,　K.Harada,　S.Ohtsuka, M.Hikita,　T.Nagata, K.Iwamoto

IEEE Transmission & Distribution conference: Asia and Pacific (T&D2009) OR10-1 1 - 6 2009年10月

Electromagnetic Wave Propagation Characteristics Emitted from air PD Caused by Simulated PD Source in Transformer Tank Model with Practical Coil 査読有り

Masayuki Hikita,Akinori Morita,Masahiro Kozako,Shinya Ohtsuka,Shin Yamada,Yasuhiko Taniguchi

16th International Sympasium on High Voltage Engineering (ISH2009) 2009年08月

SENSITIVITY OF UHF COUPLER AND LOOP ELECTRODE USING UHF METHOD AND COMPARISON FOR DETECTING A PARTIAL DISCHARGE IN GIS (2) 査読有り

T. Hoshino,S. Maruyama,T. Sakakibara,S. Ohtsuka,M. Hikita,G. Ueta

16th International Sympasium on High Voltage Engineering (ISH2009) 2009年08月

INFLUENCE OF EXTERNAL NOISES ON INSULATION DIAGNOSIS OF GIS WHEN UHF PD DETECTION METHOD IS USED 査読有り

Masayuki Hikita,Taiki Nakano,Kazutaka Omori ,Masashi Sawada,Shinya Ohtsuka,Masahiro Kozako,Hisatoshi,Ikeda ,Hiroshi Koyama,Toshihiro Hoshino,Shiro Maruyama,Yasuhiko Taniguchi,Takaaki Sakakibara

16th International Sympasium on High Voltage Engineering (ISH2009) 2009年08月

INFLUENCE OF T-BRANCH STRUCTURE OF MODEL GIS ON PROPAGATION PROPERTIES OF PD-INDUCED ELECTROMAGNETIC WAVE 査読有り

T. Nakano,K. Omori,M. Sawada,Y. Yamamura,S. Ohtsuka,M. Kozako,H. Ikeda,M. Hikita,T. Hoshino,S. Maruyama,T. Sakakibara,G. Ueta,S. Okabe

16th International Sympasium on High Voltage Engineering (ISH2009) 2009年08月

Influence of a Disconnecting Part on Propagation Properties of PD-induced Electromagnetic Wave in model GIS 査読有り

S.Ohtsuka,T.Ikeda,M.Hikita,T.Nakano,K.Omori,M.Sawada,Y.Yamamura,M.Kozako,T.Hoshino,S.Maruyama,T.Sakakibara,G.Ueta,S.Okabe

16th International Sympasium on High Voltage Engineering (ISH2009) 2009年08月

Fundamental study on Partial Discharge Induced Acoustic Wave Propagation in Simulated Transformer Composite Insulation System 査読有り

M.Kozako, K.Yamada, A.Morita, S.Ohtsuka, M.Hikita, K.Kashine, I.Nakamura, H.Koide

EEE 9th International Conference on the Properties and Applications of Dielectric Materials (ICPADM2009) E-19 477 - 480 2009年07月

University approach for circuit breaker development 査読有り

H.Ikeda, K.Harada, S.Ohtsuka, M.Kozako, M.Hikita

20th International Conference on electricity Distribution (CIRED2009) 0794 8 - 11 2009年06月

Partial Discharge and Cross Interference Phenomena in a Three-phase Construction 査読有り

Umar Khayam,Shinya Ohtsuka,Satoshi Matsumoto,Masayuki Hikita

International Journal on Electrical Engineering and Informatics 1 ( 1 ) 78 - 91 2009年04月

Comparison of electromagnetic wave, light intensity and electric charge of PD on crossed magnet wires under repetitive impulses 査読有り

Okada S., Fukunaga K., Yamaguchi K., Ohtsuka S., Kimura K., Hikita M.

Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 391 - 394 2008年12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）

For PD detection of converter-fed motor windings, electromagnetic wave is one of the promising signals because of remote detection. This paper described fundamental relations of electromagnetic wave and other optical and electric signals from PD using crossed magnetic wires under repetitive impulses. Detection capability of plural PD pulses under one voltage im pulse is discussed in detail. © 2008 IEEE.

DOI： 10.1109/CEIDP.2008.4772812

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Comparison of Electromagnetic Wave, Light Intensity and Electric Charge of PD on Crossed Magnet Wires under Repetitive Impulses 査読有り

Shinichi Okada,Kenichi Fukunaga,Kouhei Yamaguchi,Shinya Ohtsuka,Ken Kimura,Masayuki Hikita

IEEE CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENA(CEIDP2008) ( 5A-05 ) 391 - 394 2008年10月

Time and spatial-resolved spectroscopic measurement system of PD light emission and its application to observation of PDs in SF6 gas 査読有り

Yuta NAKAYAMA,Mohamad KAMAROL,Tomoki HARA,Masayuki HIKITA,Shinya OHTSUKA

IEEE CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENA(CEIDP2008) ( 5A-16 ) 439 - 442 2008年10月

Evaluation of Pollution Characteristic of Polymer Insulating Material with Surface Nano-Coating by a New Automatic Artificial Pollution Acceleration Test System 査読有り

M. Higashikoji,M. Motoyama,S. Ohtsuka,M. Hikita,H. Ikeda,J. Gavillet,G. Ravel,E. Da Silva,M. Frechette

IEEE CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENA(CEIDP2008) ( 3A-08 ) 212 - 215 2008年10月

Diagnosis of electric power apparatus using the decision tree method 査読有り

Hirose, H.; Hikita, M.; Ohtsuka, S.; Tsuru, S.-i.; Ichimaru, J.

IEEE Transactions on Dielectrics and Electrical Insulation 15 ( 5 ) 1252 - 1260 2008年10月

Insulation Characteristics of Gas Mixtures including Perfluorocarbon Gas 査読有り

M.Hikita,S.Ohtsuka,S.Okabe,S.Kaneko

IEEE Transactions on Dielectrics and Electrical Insulation 15 ( 4 ) 1015 - 1022 2008年08月

Current Interruption Properties of Self-Recovering Micro Fuse by Applying a Pulse-Shaped Overcurrent 査読有り

S. Ohtsuka,H. Suetomi,F. Akiyoshi,S. Mitarai, M. Hikita

2008 IEEE International Power Modulator Conference(PMC2008) 2008年05月

Generation of UHF Band Aerial Noise in HV　Substation and its Invasion Properties into GIS 査読有り

S.Ohtsuka,K.Omori,S.Isezima,H.Ikeda,M.Hikita,T.Hoshino,S.Maruyama,Y.Taniguchi,T.Sakakibara

2008 International Conference on Condition Monitoring and Diagnosis ( K1-11 ) 2008年04月

Partial Discharge Characteristics in UHF-band of Composite Insulation System Including Various Artificial Defects in Transformer 査読有り

Toshifumi Katsuse,Toru Kirishima,Akinori Morita,Shinya Ohtsuka,Masayuki Hikita

2008 International Conference on Condition Monitoring and Diagnosis ( A1-09 ) 2008年04月

Sensitivity of UHF coupler and loop electrode with UHF method and their comparison for detecting partial discharge in GIS 査読有り

T. Hoshino,S. Maruyama,T. Sakakibara,S. Ohtsuka,M. Hikita,G. Ueta, S. Okabe

2008 International Conference on Condition Monitoring and Diagnosis ( D1-01 ) 2008年04月

Partial Discharge Localization Method of Power Cable using High-precision Synchronization by Atomic Clocks 査読有り

Mamoru Motoyama,Shinya Ohtsuka,Masayuki Hikita,Hiroshi Suzuki ,Kazutoshi Abe

2008 International Conference on Condition Monitoring and Diagnosis ( L2-09 ) 2008年04月

Influence of Metal Flange Cover of Insulation Spacers on Propagation Properties of PD-induced Electromagnetic Wave in GIS 査読有り

M. Sawada,K. Omori,S. Isejima,S. Ohtsuka,H.Ikeda,M. Hikita,G. Ueta,S. Okabe,T.Hoshino,S. Maruyama,T. Sakakibara

2008 International Conference on Condition Monitoring and Diagnosis ( D2-12 ) 2008年04月

Propagation Properties of PD-induced Electromagnetic Wave Through L-shaped Structure in model GIS measured with UHF sensors 査読有り

K.Omori,M.Sawada,S.Isejima,S.Ohtsuka,H.Ikeda,M.Hikita,G.Ueta,S.Okabe,T.Hoshino,S.Maruyama T.Sakakibara

2008 International Conference on Condition Monitoring and Diagnosis ( K1-06 ) 2008年04月

Preliminary Investigation for Application of MEMS Acceleration Sensor to SF6 Gas Circuit Breaker 査読有り

Hisatoshi Ikeda,Kentaro Makisaka,Katsutoshi Harada,Shinya Ohtsuka,Masayuki Hikita,Katsuharu Iwamoto Toshikazu Nagata

2008 International Conference on Condition Monitoring and Diagnosis ( I2-08 ) 2008年04月

Effect of Electrode Surface Roughness and Dielectric Coating on Breakdown Characteristics of High Pressure CO2 and N2 in a Quasi-Uniform Electric Field 査読有り

M. Hikita,S. Ohtsuka,N. Yokoyama,S. Okabe,S. Kaneko

IEEE Transactions on Dielectrics and Electrical Insulation 15 ( 1 ) 243 - 250 2008年02月

Examination of Electromagnetic Mode Propagation Characteristics in Straight and L-Section GIS Model Using FD-TD Analysis 査読有り

Masayuki Hikita, Shinya Ohtsuka, Takeshi Teshima,Shigemitsu Okabe, Shuhei Kaneko

IEEE Transactions on Dielectrics and Electrical Insulation 14 ( 6 ) 1477 - 1483 2007年12月

Discharge Properties in Low Vacuum Region of Vacuum Interrupter Filled with SF6 Gas 査読有り

Mohamad Kamarol,Shinya Ohtsuka,Hitoshi Saitoh, Masayuki Sakaki,Masayuki Hikita

電気学会論文誌A 127 ( 11 ) 709 - 713 2007年11月

RPDIV/RPDEV characteristics of twisted-pair under repetitive bipolar impulse condition 査読有り

K.Fukunaga,S.Okada,S.Ohtsuka,M.Hikita,K.Kimura

2007IEEE Conference on Electrical Insulation and Dielectric Phenomena(CEIDP2007) 196 - 199 2007年10月

Effect of Ellipitical Nature of Rotating Electric Field on Partial Discharge Pattern in a Three-phase Construction 査読有り

Umar Khayam,T.Ishitobi,S.Ohtsuka,S.Matsumoto,M.Hikita

電気学会論文誌A 127 ( 9 ) 524 - 530 2007年09月

Propagation Properties of PD-induced Electromagnetic Wave in 66kV GIS Model Tank with L Branch Structure 査読有り

S.Ohtsuka,S.Matsumoto,S.Isejima,M.Hikita,K.Ohmori,M.Sawada,S.Kaneko,S.Okabe,T.Hoshino,S.Maruyama,T.Sakakibara

15th International Sympasium on High Voltage Engineering(ISH2007) T7-577 2007年08月

Effect of Foreign Particle on Rotating Electoric Field and Partial Discharge Characteristics in Three-phase Construction 査読有り

Umar Khayam,T.Ishitobi,S.Ohtsuka,S.Matsumoto,M.Hikita

15th International Sympasium on High Voltage Engineering(ISH2007) T7-502 2007年08月

Partial discharge detection by ultra-high-frequency method and emitted electromagnetic wave propagation in transformer 査読有り

Masayuki Hikita,Fumitoshi Odawara,Shinya Ohtsuka,Toru Kirishima,Sstoshi Matsumoto

15th International Sympasium on High Voltage Engineering(ISH2007) T7-573 2007年08月

Sensitivity Of UHF coupler and loop electrode with UHF method and their comparison for detecting partial discharge in GIS 査読有り

T.Hoshino,S.Maruyama,T.sakakibara,S Ohtsuka,S.Matsumoto,M.Hikita,S.Kaneko,S.Okabe

15th International Sympasium on High Voltage Engineering(ISH2007) T7-496 2007年08月

Comparison of Propagation Properties of PD-induced Electromagnetic Wave in 66kV GIS Model Tank hanving Insulation Spacers with and without Metal Flange Cover 査読有り

S.Ohtsuka,S.Matsumoto,S.Isejima,M.Hikita,S.Kaneko,S.Okabe,T.Hoshino,S.Maruyama,T.Sakakibara

15th International Sympasium on High Voltage Engineering T7-578 2007年08月

Determination of Gas Pressure in Vacuum Interrupter Based on Partial Discharge 査読有り

M.Kamarol,S.Ohtsuka,M.Hikita,H.Saitou,M.Sakaki

IEEE Transaction on Dielectrics and Electrical Insulation 14 ( 3 ) 593 - 599 2007年06月

Electromagnetic(EM)Wave Characterisitics in GIS and Measuring the EM Wave Leakage at the Spacer Aperture for Partial Discharge　Diagnosis 査読有り

M.Hikita,S.Ohtsuka,T.Teshima,S.Okabe,S.Kaneko

IEEE Transaction on Dielectrics and Electrical Insulation 14 ( 2 ) 453 - 460 2007年04月

ラム波解析に基づいたGIS内自由金属異物の位置標定システムの構築査読有り

小迫雅裕、大塚信也、金子周平、岡部成光、匹田政幸

電気学会論文誌B 127 ( 2 ) 389 - 396 2007年02月

Application of Self-recovering Micro Fuse to a Disaster Prevention Device Operated by Mechanical Impact or Vibration 査読有り

S.Ohtsuka,H.Suetomi,F.Akiyoshi,M.Hikita

20th IEEE International Conference on Micro Electro Mechanical Systems(MEMS) 593 - 597 2007年01月

Discharge Properties in Low Vacuum Region of Vacuum Interrupter Filled with SF6 Gas 査読有り

M. Kamarol,S. Ohtsuka,H. Saitou,M. Sakaki,M. Hikita.

13th Asian Conference on ElectricalDischarge P-1-20 1 - 4 2006年10月

Effect of Eccentricity of Rotating Electric Field on Partial Discharge Pattern in Three Phase Construction 査読有り

Umar Khayam,Toshio Ishitobi,Shinya Ohtsuka,Satoshi Matsumoto,Masayuki Hikita

13th Asian Conference on ElectricalDischarge ( P-1-15 ) 1 - 4 2006年10月

Relationship between PD-induced Electromagnetic Wave Measured with UHF Method and Charge Quantity Obtained by PD Current Waveform in Model GIS 査読有り

S.Ohtsuka,T.Teshima,S.Matsumoto,M.Hikita

IEEE 2006 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (CEIDP2006) 615 - 618 2006年10月

Diagnosis of Vacuum Degree in Vacuum Interrupter Based on Partial Discharge 査読有り

M.Kamarol,S.Ohtsuka,H.Saitou,M.Sakaki,M.Hikita

XXIInd International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) 1 165 - 168 2006年09月

Sparkover Mechanism of CO2 Gas Discussed by Simultaneous Measurement of PD Current and Light Emission under AC Voltage Application 査読有り

S.Ohtsuka,K.Kiyama,N.Yokoyama,S.Kaneko,S.Okabe,M.Hikita

16th International Symposium on High Voltage Engineering（ISH2005) C-08 2006年08月

Partial discharge Measurement on Three phase Construction 査読有り

U.Khayam,S.Ohtsuka,S.Matsumoto,M.Hikita

The 8th International conference on Properties and applications of Dielectric Materials(ICPADM2006) K-4 301 - 304 2006年06月

Fundamental Properties of OFF-ON Resistance of a New Type Self -recovering Fuse Operated by Dielectrophoresis 査読有り

S.Ohtsuka,H.Suetomi,M.Hikita

27th International Power Modulator Symposium and 2006 High-Voltage WorkshopIEEE International Power Modulator Conference" 474 - 477 2006年05月

Concept to be Successfully Accomplished for Insulation Diagnosis of Gas-insulated Power Apparatus Detected by Partial Discharge Signals and Relation between Charge Quantity of PD and the Induced-electromagnetic Wave Measured by UHF Method 査読有り

S.Ohtsuka,T.Teshima,Y.Hayashi,S.Matsumoto,M.Hikita

International Conference on Condition Monitoring and Diagnosis (CMD2006) ( 798 ) 2006年04月

Probabilistic Risk Management and Statistical Decision-making Method for the Maintenance of Aged Electric Power Equipment 査読有り

S.Matsumoto,S.Ohtsuka,M.Hikita

International Conference on Condition Monitoring and Diagnosis (CMD2006) ( 586 ) 2006年04月

Investigation of Ethylene Propylene rubber Degradation Mechanism of Power Cable Inslation under Surface Disharge 査読有り

Y.Z.Arief,K.Kawano,S.Ohtsuka,M.Hikita

WSEAS Transactions on Power Systems 1 ( 1 ) 108 - 115 2006年01月

FD-TD analysis of Partial discharge-induced electromagnetic wave propatagion characteristics in GIS and application to insulation diagnosis technique 査読有り

T.Teshima,A.Wada,Y.Hayashi,S.Ohtsuka,S.Kaneko,S.Okabe,M.Hikita

2005 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering OA-6 18 - 21 2005年11月

The influence of the tank material for detecting the partial discharge measurement using the UHF method in transformer oil 査読有り

F.Odawara,T.Kirishima,S.Ohtsuka,S.Matsumoto,M.Hikita

2005 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering PA-10 133 - 136 2005年11月

Investigation of Partial Discharge Characteristics in Air from Artificial Defects under Three Phase Voltage 査読有り

U.Khayam,S.Ohtsuka,S.Matsumoto,M.Hikita

2005 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering PA-2 100 - 103 2005年11月

Partial discharge characteristics of turn/turn insulation in inverter-fed motor 査読有り

T.Koyanagi,K.Fukunaga,S.Ohtsuka,K.Kimura,M.Hikita

2005 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering PA-6 116 - 119 2005年11月

Study of PD Behaviors on a Crossed Sample of Magnet-Wire with Repetitive Bipolar Impulses for Inverter-Fed Motor Coil Insulation 査読有り

K.Kimura,S.Ushirone,T.Koyanagi,Y.Iiyama,S.Ohtsuka,M.Hikita

2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) 4-6 393 - 396 2005年10月

Experimental Investigation of EPR Degradation Mechanism due to Electrical Ageing 査読有り

Y.Z.Arief,K.Kawano,Y.Urabe,S.Ohtsuka,M.Hikita

16th International Symposium on High Voltage Engineering(ISH2005) H-65 2005年08月

Discharge Properties and Emitted Electromagnetic Wave Spectrum in Low Vacuum Region of Vacuum Interrupter 査読有り

M.Kamarol,S.Ohtsuka,H.Saitoh,M.Sakaki,M.Hikita

電気学会論文誌B 125 ( 8 ) 797 - 802 2005年08月

Fluctuation of Partial Discharge Inception Voltage and Discharge Location of Twisted Pair Sample under Repetitive Impulse Voltage 査読有り

K.Kimura,S.Ushirone,T.Koyanagi,Y.Iiyama,S.Ohtsuka,M.Hikita

2005 International Symposium on Electrical Insulating Materials(ISEIM2005) A3-7 176 - 179 2005年06月

A method to classify the signals from artificially prepared defects in GIS using the decision tree method 査読有り

H.Hirose,T.Ohhata,Y.Kotou,S.Matsuda,M.Hikita,T.Nishimura,S.Ohtsuka,S.Matsumoto,S.Tsuru,J.Ichimaru

2005 International Symposium on Electrical Insulating Materials(ISEIM2005) B6-8 885 - 888 2005年06月

Discharge Phenomena in Low Vacuum Region of Glass Tube Vacuum Interrupter under AC Applied Voltage 査読有り

M.Kamarol,S.Ohtsuka,H.Saitou,M.Sakaki,M.Hikita

2005 International Symposium on Electrical Insulating Materials(ISEIM2005) A1-6 36 - 39 2005年06月

レーザ生成プラズマを用いた高温ガス絶縁特性の評価査読有り

縄田能久，原野孝幸，大塚信也，趙孟佑，八重樫祐司，植田俊明，藤江栄治，匹田政幸

電気学会論文誌B 125 ( 4 ) 425 - 433 2005年04月

Study on Metallic Particle Motion and Partial Discharge Characteristics in GIS Tank Filled with CO2 and SF6 査読有り

M.Onomoto,T.Nishimura,T.Teshima,S.Ohtsuka,S.Matsumoto,M.Hikita

IEEJ Trans. FM 125 ( 1 ) 71 - 76 2005年01月

Examination of Partial Discharge Characteristics by Discharge Light Emission in CO2 and SF6 Gases 査読有り

K.Kiyama,N.Yokoyama,S.Ohtsuka,S.Matsumoto,S.Kaneko,S.Okabe,M.Hikita

Proc. of 12th Asian Conference on Electrical Discharge B-25 265 - 268 2004年11月

Effect of Fillers on Ageing Properties by Partial Discharge of EPR Used in Cable Insulation 査読有り

Y.Z.Arief,K.Kawano,T.Mizuno,S.Ohtsuka,M.Hikita

Proc. of 12th Asian Conference on Electrical Discharge（ACED2004) 466 - 469 2004年11月

Risk Management Method Using the Risk Priority Number for Long Service Power Equipment from the Corporate Social Responsibility Point of View 査読有り

S.Matsumoto,S.Ohtsuka,M.Hikita

Proc. of 12th Asian Conference on Electrical Discharge C-3 295 - 298 2004年11月

PD Behavior of Twisted-pair Sample under Repetitive Impulsed Simulating Inverter-fed Motor Insulation 査読有り

K.Kimura,S.Ushirone,S.Ohtsuka,M.Hikita

Conference Record of the International Conference on Electrical Machines and Systems 2004(ICEMS2004) OG-2 OG2-630-M12-029 2004年11月

リスクアセスメントのためPD放射電磁波第一波に及ぼすGISタンクサイズとセンサ位置の影響査読有り

大塚信也，尾野本道雄，手嶋隆志,金子周平,岡部成光,匹田政幸

電気学会論文誌B 124 ( 11 ) 1365 - 1372 2004年11月

Influence of ATH Contents on Leakage Current Characteristics and Degradation of Polymer Materials 査読有り

Y.Souta,T.Tsurusaki,A.Takenouchi,S.Ohtsuka,A.Ohno,M.Hikita

Proc. of 12th Asian Conference on Electrical Discharge 498 - 501 2004年11月

Switching phenomena of a new type PTC device as a reusable current-limiting fuse operated by dielectrophoresis 査読有り

S. Ohtsuka,Y.Souta,T. Abe,K. Kimura,M. Hikita

2004 Annual report conference on Electrical Insulation and dielectric Phenomena(CEIDP2004) 592 - 595 2004年10月

Partial Discharge Inception Voltage of Twisted Pair Samples under Long-Time Repetitive Bipolar Impulses 査読有り

K.Kimura,S.Ushirone,T.Fukushima,S.Ohtsuka,M.Hikita

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation 192 - 195 2004年09月

Search of Optimum Gas Mixture Ratio as Gas Insulating Medium by Genetic Algorithm 査読有り

M.Cho,S.Ishiyama,S.Ohtsuka,M.Hikita

IEEE Trans. on Dielectrics and Electrical Insulation 11 ( 2 ) 334 - 347 2004年07月

非線形電界緩和層を有する高電圧回転機固定子コイルエンド部の電位分布のEMTP解析査読有り

森山智宏，伊藤勝教，大塚信也，萩森英一，木村健，匹田政幸

電気学会論文誌A 124 ( 5 ) 427 - 434 2004年05月

Influence of Sensor Location and Tank Size on Determination of Discharge Type Based on PD Electromagnetic Waves Propagation in GIS 査読有り

Y.Kunitake,M.Onomoto,S.Ohtsuka,S.Yuasa,S.Okabe and M.Hikita

IEEJ Trans. PE 124 ( 5 ) 771 - 777 2004年05月

Time-Developing Partial Discharge Properties Leading to Sparkover in SF6, N2, CO2 and Their Gas Mixtures under Lightning Impulse Voltage Application 査読有り

S.Ohtsuka,K.Kiyama,M.Cho,S.Matsumoto,M.Hikita

10th International Symposium on Gaseous Dielectrics X 129 - 135 2004年04月

Effect of the Electrode Coating and the Field Utilization Factor on the Insulation Property of Carbon Dioxide Gas under AC Voltage 査読有り

S.Matsumoto,N.Yokoyama,K.Kiyama,S.Ohtsuka,M.Hikita

10 th International Symposium on Gaseous Dielectrics X 347 - 352 2004年04月

交流および直流電圧印加時のSF6およびCO2を含むSF6混合ガスのPD時系列特性査読有り

大塚信也,高村正樹,江口和寿,匹田政幸

電気学会論文誌B 124 ( 2 ) 313 - 320 2004年02月

EDF's Test by Monitoring Leakage Current Separated into Three Frequency Components for Polymer Insulators 査読有り

T.Tsurusaki,Y.Souta,S.Ohtsuka,A.Ohno,Y.Hashimoto,S.Higashi,M.Hikita

Proc. of 2003 Japan-Korea Joint Symposium on ED & HVE 237 - 240 2003年11月

Study on metallic particle motion and partial discharge characteristics in GIS tank filled with CO2 査読有り

M. Onomoto,T. Nishimura,T. Teshima,S. Ohtsuka,S. Matsumoto,M. Hikita

2003 Japan-Korea Joint Symposium on ED & HVE 2003年11月

Advanced Optimum Design Algorithm using Monte Carlo Method and its Applidation to High-voltage Equipment 査読有り

S.Matsumoto,S.Ohtsuka,M.Hikita

Proc. of 2003 Japan-Korea Joint Symposium on ED & HVE 333 - 336 2003年11月

Discussions on PD inception voltage of magnet wires under repetitive bipolar impulse condition 査読有り

K.Kimura,S.Itaya,S.Ushirone,S.Ohtsuka,M.Hikita

Proc. of 2003 Japan-Korea Joint Symposium on ED & HVE 81 - 84 2003年11月

超音波伝搬特性を考慮したGIS内自由金属異物の挙動および評価サイズ査読有り

尾野本道雄，國武義高,大塚信也，小迫雅裕,湯浅禎之,岡部成光,匹田政幸

電気学会論文誌B 123 ( 11 ) 1387 - 1393 2003年11月

Motion analysis and size estimation of a free moving metallic particle in GIS based on propagation properties of acoustic wave 査読有り

M.Hikita,M.Onomoto,Y.Kunitake,M.Kozako,S.Yuasa,S.Okabe,S.Ohtsuka

Proc. of the 13th International Symposium on High Voltage Engineering(ISH2003) 2003年10月

Insulation Properties of High-Pressure CO2 Gas under Existence of a Particle 査読有り

S.Ohtsuka,M.Onomoto,T.Nishimura,S.Matsumoto,M.Hikita

3rd IASTED International Conference on Power and Energy Systems 721 - 726 2003年09月

Light emission properties of SF6 gas mixture in impulse breakdown process 査読有り

S.Ohtsuka,K.Eguchi,M.Cho,S.Yuasa,S.Okabe,M.Hikita

Proc. of the 13th International Symposium on High Voltage Engineering (ISH2003) 2003年08月

Influence of GIS tank size on discrimination of discharge type based on PD-induced electromagnetic wave with UHF method 査読有り

S.Ohtsuka,Y.Kunitake,M.Onomoto,T.Nishimura,S.Yuasa,S.Okabe,M.Hikita

Proc. of the 13th International Symposium on High Voltage Engineering(ISH2003) 2003年08月

Partial Discharge Characteristics till Breakdown for XLPE Cable Joint with an Artificial Defect 査読有り

S.Tokunaga,T.Tsurusaki,Y.Z.Arief,S.Ohtsuka,T.Mizuno,M.Hikita

Proc. of the 7th Internatilnal Conference on Properties and Applications of Dielectric Materials 3 1206 - 1209 2003年06月

Construction of Remote Monitoring System for Separative Measurement of Leakage Current of Outdoor Insulators 査読有り

S.Kurihara,Y.Z.Arief,S.Ohtsuka,Y.Hashimoto S.Higashi,M. Hikita

Proc. of the 7th Internatilnal Conference on Properties and Applications of Dielectric Materials 1 401 - 404 2003年06月

VFT電圧に対するSF6ガスの放電特性査読有り

池田正巳,福本晋,高尾浩史,大塚信也,萩森英一,匹田政幸

電気設備学会誌 23 ( 5 ) 363 - 368 2003年05月

磁性および導電性を有する平板および中空円筒の超低周波磁界に対するシールド効果査読有り

森山智広,浅野勝行,大塚信也,趙孟佑,匹田政幸

電気設備学会誌 122 ( 12 ) 972 - 978 2002年12月

Optical Measurement of the Laser-Produced Plasma Simulating High Temperature Gases at Arc Quenching in Gas Circuit Breaker 査読有り

Y.Nawata,T.Takashima,S.Ohtsuka,M.Cho,M.Hikita

2002 Joint Conference of ACED & Korea-Japan Symposium on ED and HVE 1 308 - 311 2002年11月

EMTP Analysis of Electric Field Distribution on Stator End-winding with Nonlinear Stress Grading 査読有り

T.Moriyama,S. Ohtsuka,E. Haginomori,K.Kimura,M.Hikita

2002 Joint Conference of ACED & Korea-Japan Symposium on ED and HVE 1 31 - 34 2002年11月

Influence of GIS Tank Size on Detection Properties of PD Signals Measured by UHF and AE Methods 査読有り

S.Ohtuka,Y.Kunitake,T.Nishimura,M. Onomoto,S. Yuasa,S. Okabe,M. Hikita

2002 Joint Conference of ACED & Korea-Japan Symposium on ED and HVE 1 202 - 205 2002年11月

Partial Discharge Characteristics and Electric Field Calculation for XLPE Cable and Joint of EPR/XLPE Interface with Void and Metal Particle Defects 査読有り

S.Tokunaga,Y.Z.Arief,S.Ohtsuka,T.Mizuno,M.Hikita

2002 Joint Conference of ACED & Korea-Japan Symposium on ED and HVE 2 503 - 506 2002年11月

Partial Discharge Inception Condition of Short Air Gap Under Repetitive Pulse Voltage with Polarity Reversal 査読有り

S.Itaya,S.Ohtsuka,K.Kimura,M.Hikita

2002 Joint Conference of ACED & Korea-Japan Symposium on ED and HVE 2 594 - 597 2002年11月

PD Time Sequential and Light Emission Properties as Pre-breakdown Phenomena of SF6/N2/CO2 Gas Mixture 査読有り

S.Ohtsuka,M.Koumura,M.Cho,M.Nakamura,M.Hikita

2002 Annual Report Conference on Electrical Insulation and Dielectric Phenomena 801 - 804 2002年10月

Discussion on Discharge Mechanism Based on Leakage Current Measurement of Outdoor Polymeric Insulating Materials in Salt-fog Test 査読有り

M.Hikita,M.Miyata,S.Kurihara,S.Ohtsuka,Y.Hashimoto,S.Higashi

2002 Annual Report Conference on Electrical Insulation and Dielectric Phenomena 375 - 378 2002年10月

Algorithm for Determining the Surface Leakage Current on Polymer Insulating Materials Based on Current Waveform Distortion 査読有り

H.Homma,T.Kuroyagi,T.Takahashi,S.Ohtsuka,M.Hikita

2002 Annual Report Conference on Electrical Insulation and Dielectric Phenomena 676 - 679 2002年10月

波形歪みに基づく高分子絶縁材料の表面漏れ電流分離計測アルゴリズムの提案査読有り

本間宏也,畔柳俊幸,高橋毅,大塚信也,匹田政幸

電気学会論文誌A 122 ( 7 ) 702 - 710 2002年07月

EMTPで観察した同期機突発短絡現象査読有り

萩森英一,大塚信也

電気学会論文誌B 122 ( 7 ) 1096 - 1103 2002年07月

UHF法で測定された電磁波第一波の振幅比に基づくGIS絶縁異常の診断査読有り

大塚信也,竹中賢司,小迫雅裕,趙孟佑,松久孝司,匹田政幸

電気学会論文誌B 122 ( 6 ) 769 - 775 2002年06月

ポリマー碍子の表面劣化評価試験のための漏れ電流周波数３成分分離自動測定システムの構築査読有り

久恒剛,宮田真人,大塚信也,橋本洋助,廣渡健,匹田政幸

電気学会論文誌B 122 ( 4 ) 486 - 491 2002年04月

平等電界下におけるCO2/N2/SF6混合ガスの絶縁特性査読有り

大塚信也,高村正樹,趙孟佑,椎木元晴,鈴木克巳,匹田政幸

電気学会論文誌B 122 ( 3 ) 429 - 435 2002年03月

三次元電解解析による架橋ポリエチレンケーブルジョイント界面部の欠陥の絶縁評価査読有り

竹下佳生,池田正巳,石橋正栄,大塚信也,渡辺和夫,匹田政幸

電気設備学会誌 22 ( 2 ) 127 - 133 2002年02月

GIS内の部分放電およびフリー異物により発生するラム波の時間周波数解析査読有り

小迫雅裕,大塚信也,松久高士,匹田政幸

電気学会論文誌B 122 ( 6 ) 719 - 724 2002年02月

EMTPで観察した同期機突発短絡現象査読有り

萩森英一, 大塚信也

電気学会論文誌. B ( 一般社団法人電気学会 ) 122 ( 10 ) 1096 - 1103 2002年01月

記述言語：日本語掲載種別：研究論文（学術雑誌）

Applying ATP-EMTP for the purpose of thorough understanding of rotating machine transients, several kinds of model synchronous machines with typical features were analyzed in time domain as for sudden short circuiting, the calculated currents and flux linkages of which were plotted on the d-q domain planes. Many interesting current/flux vector traces, representing rotating machine transients during short circuiting, were obtained. These could, hopefully, be good help for understanding rotating machine transients.

DOI： 10.1541/ieejpes1990.122.10_1096

その他リンク： https://ci.nii.ac.jp/naid/130006841234

高電圧気中電界シールドの形状設計法の検討査読有り

高尾浩史,池田正巳,福元晋,大塚信也,萩森英一,匹田政幸

電気設備学会誌 21 ( 12 ) 1033 - 1038 2001年12月

Effects of Laser-Produced Plasma Simulating High Temperature Gases at Arc Quenching on Flashover Voltage 査読有り

M.Mori,S.Ohtsuka,M.Cho,M.Hikita,M.Nakamura

Proc. of 2001 Japan-Korea Joint Symposium on Electrical Discharge and High Voltage Engineering 145 - 148 2001年11月

Time-sequential Characteristics of Partial Discharge in SF6/N2/CO2 Gas Mixture under dc Non-uniform Field 査読有り

M.Koumura,K.Eguchi,S.Ohtsuka,M.Cho,M.Nakamura,M.Hikita

Proc. of 2001 Japan-Korea Joint Symposium on Electrical Discharge and High Voltage Engineering 337 - 340 2001年11月

Evaluation of Aging Polymer Insulator in EdF's Test 査読有り

M.Miyata,S.Ohtsuka,Y.Hashimoto,T.Hirowatari,M.Hikita

International Symposium of Electrical Insulating Materials 355 - 358 2001年11月

Breakdown Characteristics of Oil and Paper Insulation for Very Fast Transient Voltage 査読有り

大塚　信也

Trans. IEE of Japan Vol121-B ( No.9 ) 1206 - 1212 2001年09月

VFT電圧に対する油および油浸紙の絶縁破壊特性査読有り

池田正巳,福元晋,高尾浩史,大塚信也,萩森英一,匹田政幸

電気学会論文誌B 121 ( 9 ) 1206 - 1212 2001年09月

ELF Magnetic Field Distribution From Electric Power Cable Surrounded by Asymmetric Configuration of Metal Pipe 査読有り

.Moriyama,K.Asano,S.Ohtsuka,M.Cho,J.W.Hong,M.Hikita

2001 International Symposium on High-Voltage Engineering (ISH) 1 ( 15 ) 58 - 61 2001年08月

Time-Frequency Analysis of Lamb Waves Using Wavelet Transform for Location Identification of Defects in GIS 査読有り

M.Kozako,S.Ohtsuka,K.Sawai,M.Hikita

Proc. of the 12th International Symposium on High Voltage Engineering 6 991 - 994 2001年08月

Change of ELF Magnetic Field Distribution Caused by Asymmetric Configuration of Electric Power Cable Covered with Metal Pipe 査読有り

T.Moriyama,K.Asano,S.Ohtsuka,M.Cho,J.W.Hong,M.Hikita

2001 Asia-pacific Radio Science Conference 146 - 146 2001年08月

不平等電界下におけるCO2/N2/50%SF6混合ガスの絶縁特性査読有り

大塚信也,永良俊治,高村正樹,橋本洋助,中村道昭,匹田政幸

電気学会論文誌B 121 ( 7 ) 830 - 836 2001年07月

GIS中の超音波伝搬特性とそれに基づく新しい部分放電発生位置標定査読有り

小迫雅裕,大塚信也,澤井浩司,匹田政幸

電気学会論文誌B 121 ( 5 ) 677 - 682 2001年05月

Study on Insulation Capability of High Temperature Gas Via Laser-Produced Plasma 査読有り

M.Cho,S.Nagasawa,M.Mori,S.Ohtsuka,M.Hikita,Y.Hashimoto,M.Nakamura

9th International Symposium on Gaseous Dielectrics IX 351 - 356 2001年05月

PD Inception and Breakdown Voltage Characteristics in PFC and SF6 Gas Mixtures 査読有り

S.Ohtsuka,M.Koumura,K.Eguchi,M.Cho,S.Yuasa,S.Okabe,M.Hikita

9th International Symposium on Gaseous Dielectrics IX 211 - 216 2001年05月

Insulation Properties of CO2/N2 Gas Mixture with a Small Amount of SF6 査読有り

S.Ohtsuka,M.Koumura,M.Cho,Y.Hashimoto,M.Nakamura,M.Hikita

9th International Symposium on Gaseous Dielectrics IX 295 - 300 2001年05月

Measurement and Shielding of ELF Magnetic Field around Electric Power Facility 査読有り

M.Moriyama,K.Asano,S.Ohtsuka,M.Cho,M.Hikita

the International Conference on Electrical Engineering 2000 (ICEE2K) D-1-07 121 - 124 2000年07月

ディジタルフィルタを用いた部分放電放射電磁波からの連続周期的ノイズの除去査読有り

小迫雅裕,田志海,大塚信也,柴田信之,匹田政幸

電気学会論文誌B 120 ( 7 ) 975 - 981 2000年07月

Separate Measurement of Conductive and Pulsive Components of Leakage current of Porcelain and Polymer Materials for Outdoor Insulator 査読有り

M.Hikita,H.Kawasaki,M.Miyata,S.Ohtsuka,T.Yoshiura,K.Miura

6th International Conference on Properties and Applications of Dielectric Materials (ICPADM'2000) 2000年06月

Systematization of Non-uniform Electric Field Coefficient in High-voltage Apparatus 査読有り

M.Ikeda,A.Suyama,M.Kurose,S.Ohtsuka,E.Haginomori,M.Hikita

Proc. of 2000 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering 803 - 1-803-4 2000年04月

Breakdown Characteristics of Oil and Paper Insulation for Very Fast Transient Voltage 査読有り

S.Fukumoto,H.Takao,S.Ohtsuka,M.Ikeda,E.Haginomori,M.Hikita

Proc. of 2000 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering 903 - 1-903-4 2000年04月

PD Inception and Breakdown Voltages Characteristics of N2 And CO2 Gas Mixtures Including a PFC Gas under Nonuniform Field 査読有り

S.Ohtsuka,M.Koumura,K.Eguchi,S.Yuasa,S.Okabe,M.Hikita

Proc. of 2000 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering 806 - 1-806-4 2000年04月

Effect of Mixture of a Small Amount of CO2 in SF6/N2 Mixed Gas on the Insulation Performance under Nonuniform Field 査読有り

S.Ohtsuka,S.Nagara,K.Miura,M.Nakamura,M.Hikita

Conference Record of the 2000 IEEE International Symposium on Electrical Insulation 288 - 291 2000年04月

Quench Characteristics of Parallel Circuit of Two Mechanical PCS's 査読有り

未入力

IEEE Trans. on Applied Superconductivity 9 ( 2 ) 1085 - 1088 1999年04月

Quench Time Lag and its Statistical Characteristics of NbTi Mechanical PCS Measured with Pulsed Current 査読有り

未入力

IEEE Trans. on Applied Superconductivity 9 ( 2 ) 1125 - 1128 1999年04月

Fast Quench of Superconducting Wire by Pulsed Current and its Application to Pulsed Power Generator 査読有り

J.Suehiro,K.Tsutsumi,D.Tsuji,S.Ohtsuka,K.Imasaka,M.Hara

Proc. of the 11th International Symposium on High-voltage Engineering 5 390 - 393 1999年04月

Frequency Spectrum Characteristics of PD Electromagnetic Waves in GIS Measured by UHF Sensors 査読有り

S.Ohtsuka,K.Takenaka,M.Hikita

Proc. of 1999 Japan - Korea Joint Symposium on Electrical Discharge and High Voltage Engineering 269 - 272 1999年04月

Measurements and Location Identification of Partial Discharge in Dry-type Metalized Polypropylene Film Capacitor 査読有り

Y.Makino,S.Ohtsuka,Z.H.Tian,T.Hirota,M.Hikita

Proc. of 1999 Japan - Korea Joint Symposium on Electrical Discharge and High Voltage Engineering 265 - 268 1999年04月

2組のNbTi機械式PCSから成る並列PCS回路のクエンチ特性査読有り

未入力

電気学会論文誌 119-B ( 3 ) 394 - 400 1999年03月

NbTi機械式PCS開放時のアーク放電特性とアークが超伝導接点接続に及ぼす影響査読有り

大塚信也,大坪秀一,中村貴史,辻大輔,末廣純也,原雅則

電気学会論文誌B 118 ( 12 ) 1398 - 1405 1998年12月

Magnetic Field Dependence of Transition Current of NbTi Mechanical PCS 査読有り

S.Ohtsuka,T.Nakamura,D.Tsuji,J.Suehiro,M.Hara

Cryogenics 38 ( 12 ) 1207 - 1212 1998年12月

Characteristics of NbTi Mechanical Persistent Current Switch and Mechanism of Superconducting Connection at Contact 査読有り

S.Ohtsuka,H.Ohtsubo,T.Nakamura,J.Suehiro,M.Hara

Cryogenics 38 ( 9 ) 893 - 902 1998年09月

Characteristics of NbTi mechanical persistent current switch and mechanism of superconducting connection at contact 査読有り

Ohtsuka S., Ohtsubo H., Nakamura T., Suehiro J., Hara M.

Cryogenics 38 ( 9 ) 893 - 902 1998年09月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

A Persistent Current Switch (PCS) in a SMES system requires not only low ON resistance but also high OFF resistance in order to efficiently perform a load-leveling operation. Because a mechanical switch has the advantage of infinite OFF resistance, it can operate without generating Joule losses during the coil excitation and energy transfer process. However, it will cause an energy storage loss as long as the ON resistance, which mainly depends on contact resistance, is not decreased to zero. In this study, firstly case studies on energy losses due to the ON resistance of a mechanical switch and OFF resistance of a superconducting switch are carried out so as to show the necessity of a mechanical switch as a PCS in a large-scale SMES system. Secondly the contact resistance characteristics of a mechanical switch with NbTi bulk contact pieces are experimentally investigated as a function of switch driving force, switch pressing force, and ON-OFF operation number. Additionally, the effects of contact piece shape and its surface roughness on the contact resistance are examined. It was found that a superconducting connection at contact can be realized even if the switch is repeatedly opened and closed many times. The developed mechanical PCS, which has zero contact resistance, supports a superconducting current flow of more than 200 A. The formation mechanism of the superconducting connection at contact is modeled and analyzed based on theoretical considerations. © 1998 Cryogenic Association of Japan. Published by Elsevier Science Ltd. All rights reserved.

DOI： 10.1016/S0011-2275(98)00079-4