| Project/Area Number |
04402028
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
電力工学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KOUNO Teruya The University of Tokyo, The Faculty of Engineering, Professor, 工学部, 教授 (30010705)
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| Co-Investigator(Kenkyū-buntansha) |
CHIBA Masakuni The University of Tokyo, The Faculty of Engineering, Research Associate, 工学部, 助手 (20011140)
HIDAKA Kunihiko The University of Tokyo, The Faculty of Engineering, Associate Professor, 工学部, 助教授 (90181099)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥25,500,000 (Direct Cost: ¥25,500,000)
Fiscal Year 1994: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1993: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 1992: ¥19,500,000 (Direct Cost: ¥19,500,000)
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| Keywords | Electrical breakdown / High voltage / Electrical insulation / Electrical discharge / Model / Laser / Transmission line / Electric field / 気体絶縁 / 気体放電 / レーザトリガ放電 / 電界測定 / レーザ生成プラズマ / UHV送電 / 放電誘導 / レーザトリガ / 絶縁設計 / 放電モデル / 炭酸ガスレーザ / 直流高電圧 / フラッシオーバ電圧 / 不平等電界 |
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| Research Abstract |
A model of electrical discharge development by which electrical insulation strength can be predicted is required for realizing a high reliability of insulation design of a compact UHV transmission line system expected as a future promising system. To make such a model, the precise observation of the discharge development is strongly needed. Some factors affecting the discharge development was examined successfully by using a laser induced plasma which can control the initiation and the path of the discharge. A Pockels sensor was developed and used to measure electric field in the discharge space because the discharge development was controlled mainly by the electric field.
A 3.5J CO2 laser beam was transmitted into a rod-to-plane gap which was dc electrically stressed. Trigger and guide effects of the discharge were usually observed simultaneously. The occurrence of the discharge was triggered by the irradiation of the laser and subsequently the path of it was guided along the laser induced plasma. It was found that the breakdown voltage of the gap was decreased by the existence of the plasma.
In this study, only the trigger effect was observed under such a condition that a relatively low positive voltage was applied to the rod electrode. The discharge path did not lie along the laser induced plasma. The delay time between the irradiation of laser and the breakdown of a gap varied from several hundreds mus to several ms. From the measurement of the electric field it was found that negative charge appeared at the positive polarity side of the laser induced plasma and enhanced the electric field near the plasma. The trigger effect can be caused due to the drift of negative ions produced in the laser induced plasma.
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