| Project/Area Number |
08555069
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
電力工学・電気機器工学
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| Research Institution | NAGOYA INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
NAKAMURA Koichi NAGOYA INSTITUTE OF TECHNOLOGY,DEPT.OF SYSTEMS MANAGEMENT AND ENGINEERING,PROFESSOR, 教授 (10024283)
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| Co-Investigator(Kenkyū-buntansha) |
INABA Tsuginori CHUM UNIVERSITY,DEPT.OF ELECTRICAL ENGINEERING,PROF., 理工学部, 教授 (90266271)
WAKAMATSU Masatoshi NUMAZU COLLEGE OF TECHNOLOGY,DEPT.OF ELECTRICAL ENGINEERING,PROF., 教授 (40043145)
NAKANO Minor TOYOTA COLLEGE OF TECHNOLOGY,DEPT.OF INFORMATION ENGINEERING,PROF., 教授 (50023685)
KAWASAKI Zenichiro OSAKA UNIVERSITY,DEPT.OF ELECTRICAL ENGINEERING,ASSOCIATE PROF., 工学部, 助教授 (60126852)
YODA Masayuki AICHI INSTITUTE OF TECHNOLOGY,DEPT.OF ELECTRICAL ENGINEERING PROF., 工学部, 教授 (80103240)
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| Project Period (FY) |
1996 – 1998
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| Keywords | space charge / corona discharge current / transmission line and tower / electric field intensity / shielding effect / triggered lightning to tower / energy of lightning discharge channel / optical, electrical and acoustic measurements |
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| Research Abstract |
In order to make clear the shielding effect of surrounded space charge on the lightning striking characteristic to the transmission line, the measurement of the corona discharge current emitted from a transmission tower was performed, and the artificial triggered lightning tests for the transmission line were carried out in parallel. During three years since 1996, the experiments have been performed in Mt. Okushishikui near Japan sea for winter thundercloud. The experiments were continued during one month on November in each year. The results were as follows,
(1) The corona discharge current measurement was performed at eight arm ends of a test transmission tower which is 60 meters high. The maximum current was more than 500 A which was measured at one arm end on the up pest level. The currents at the lower level were comparatively smaller than the upper level.
(2) The average charge of the current from the whole arms of the tower was around 0.1 C/hour under the exposure of thundercloud.
(3) The artificial triggered lightning experiment was performed using rocket. First the rocket carries a bobbin from which a nylon line was pulled out and a wire connected follows. The nylon line was used for insulation of wire from the ground. The length of the nylon line was 160m. Thirteen times of triggered lightning struck the transmission line and tower. It is estimated that the lightning strikes to the transmission line and tower take place in the surrounded air with such space charge.
(4) Additional seventeen times of triggered lightning were obtained to strike the ground level by means of another triggering methods, and the current wave forms and the energy of lightning discharge channel were measured. And another kinds of observation were successfully performed.
(5) The total triggered lightning strikes obtained in these three years were 30 times.
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