Current Affiliation Organization 【 display / non-display 】

Current Affiliation Organization 【 display / non-display 】

Academic degree 【 display / non-display 】

Academic degree 【 display / non-display 】

Research Interests 【 display / non-display 】

Research Interests 【 display / non-display 】

Research Areas 【 display / non-display 】

Research Areas 【 display / non-display 】

Research Theme 【 display / non-display 】

Research Theme 【 display / non-display 】

• Optimal Operation of Electric Power System

• Voltage Stablity Evaluation in Electric Power System

Published Papers 【 display / non-display 】

Published Papers 【 display / non-display 】

• A study of lightning location system (Blitz) based on VLF sferics

  Narita Tomomi, Wanke Egon, Sato Mitsuteru, Sakanoi Takeshi, Kumada Akiko, Kamogawa Masashi, Hirohiko Ishikawa, Harada Shigemi, Kameda Takao, Tsuchiya Fuminori, Kaneko Eiji

  2018 34th International Conference on Lightning Protection (ICLP)     2018.09

  Type of publication: Research paper (international conference proceedings)

  　View Summary

  Blitzortung.org is a worldwide non-commercial low-cost community based Time of Arrival lightning detection and lightning location network. The aim of this project is to accomplish a low budget high accurate worldwide lightning location network based on a high number of receiver sites spaced close to each other, typically separated by 50 km 250km. The stations transmit their data to a central server, where the strike locations are computed by the arrival times of the signals. The station operators are volunteers who bought and assembled the hardware by themselves. We installed this sensor in more than 24 locations throughout Japan, for example Hokkaido, Tokyo, Okinawa, Ogasawara etc. This paper describes the outline of Blitzortung and the evaluation of the position accuracy.

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• Proposal of EMTP Surge Analysis Model for a Power Cable through a Transmission Tower

  Oshiro Ryoji, Shiozuka Taishi, Harada Shigemi, Kaneko Eiji, Inoue Yoshino, Kurata Tomoshige, Yokokura Kunio

  IEEJ Transactions on Power and Energy ( The Institute of Electrical Engineers of Japan )  138 ( 9 ) 791 - 798   2018.09 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

  <p>Surge voltages often have much higher value and changing rate than those of power frequency voltages, and might cause damages to apparatuses or equipment not only on near a surge source, for example lightning struck point, but also on far points from it due to propagating. In addition, surge phenomena often become complex due to the reflections and the superpositions on a point where surge impedances having different value are connected. The surge phenomenon occurring on a power cables connected with a transmission tower is one of these cases. This research's goal is to propose the EMTP model for surge phenomenon occurring on cables arranged through a transmission tower. The proposed model simulates such cable by using a cable model through a pipe conductor. The results calculated by the proposed model ware compared with the results by VSTLrev (Virtual Surge Test Lab. Restructured and Extended Version) which is a surge analysis program based on FDTD (Finite Difference Time Domain) method to verify the accuracy of the proposed model. As a result, the proposed model is reasonable for analysis of a surge phenomenon occurring on a cable through a transmission tower.</p>

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• A Simulation Study of Surge Phenomena on Distribution Line in the Structure Nearby the Lightning to Ground

  Oshiro Ryoji, Harada Shigemi, Kaneko Eiji

  IEEJ Transactions on Power and Energy ( The Institute of Electrical Engineers of Japan )  136 ( 7 ) 628 - 635   2016.07 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

  Household appliances and information equipment with electrical circuits have come into wide use. These appliances and equipment seem sensitive to an electrical surge. In addition, a lightning might affect electrical systems not only on the lightning point but also on the systems at vicinity of the point. If the induced surges invade into low voltage distribution systems, it might cause severe damages to the appliances and the equipment. Therefore, it is necessary to investigate these induced phenomena. FDTD (Finite Difference Time Domain) method is often applied to analyze surge phenomena, which can treat analysis objects as three-dimensional circuits. For simulating these phenomena, we adopt VSTL rev. (Virtual Surge Test Lab. rev.) which is the surge analysis simulation program based on the FDTD method. In this paper, we discuss the investigation results regarding the lightning induced surge phenomena on low voltage distribution lines in a house and the relationship between lightning surges and a soil resistivity, and the effect on the surge phenomena by SPD (Surge Protective Device) on the low voltage distribution lines.

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• Investigation of Surge Characteristics of Vertically Arranged Co-axial Cable

  Oshiro Ryoji, Ganaha Kazuki, Harada Shigemi, Kaneko Eiji

  IEEJ Transactions on Power and Energy ( The Institute of Electrical Engineers of Japan )  136 ( 2 ) 184 - 191   2016.02 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

  In EMTP, it is very hard to simulate a vertically arranged cable, since its surge impedance gradually changes with the distance from the ground to a top point. In the past, some researches about surge impedances and responses of vertical conductor (for example transmission tower, concrete pole and so on.) have been carried out, these researches are being continued now. However, there is no model of vertical co-axial cable in EMTP. In order to analyze surge voltage arisen on the electrical system, approach of method for treating this model in EMTP is required. In this paper, experiments of surge impedance and response on vertical cable, method of treating for vertical co-axial cable in EMTP and accuracy confirmed as compared result of this model with analysis result of VSTL Rev. (Virtual Surge Test Lab. rev. ) which is constructed under FDTD (Finite Difference Time Domain) method, are reported.

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• A method of voltage stability evaluation for branch and generator outage contingencies

  N. Yorino, H. Q. Li, S. Harada, A. Ohta, H. Sasaki

  IEEE Transactions on Power Systems ( その他の出版社 )  19 ( 1 ) 252 - 259   2004.02 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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