| Project/Area Number |
04452160
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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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 | Yamagata University |
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Principal Investigator |
ASANO Kazutoshi Yamagata University, Department of Electrical & Information Engineering, Professor, 工学部, 教授 (30007182)
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| Co-Investigator(Kenkyū-buntansha) |
YATSUZUKA K. Yamagata University, Department of Electrical & Information Engineering, Lecture, 工学部, 講師 (60210283)
HIGASHIYAMA Y. Yamagata University, Department of Electrical & Information Engineering, Associa, 工学部, 助教授 (50144209)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1993: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1992: ¥3,500,000 (Direct Cost: ¥3,500,000)
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| Keywords | Charged particle / Space charge / Airless nozzle / Induction charging / Space charge discharge |
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| Research Abstract |
To occur electrical discharge in a space charge cloud without electrode, space charge cloud consisted with charged droplets was formed. The charged droplets were produced by an airless nozzle equipped with an induction charging electrode near the tip of the nozzle. The charge quantity of the droplets depends on the mass quantity and the geometry of the charging electrode.
Corona point discharge at the tip of a grounded needle electrode inserted into a charged droplet cloud has been investigated. The cloud is confined within a cylindrical grounded electrode 1m in diameter and 2m in height to define the size of the cloud. The maximum charge density of the cloud obtained was 2.6muC/m^3. Corona discharge occurred when the grounded needle electrode was inserted into the center of the charged cloud. In a negative charged cloud, positive glow corona occurred when small radius of needle electrode was used. However, positive streamer corona was observed when a large radius of needle electrode was used.
Flashover characteristics of air gap within charged droplet cloud ejected from an airless nozzle using induction charging method are discussed. The droplets are charged in the range-200 to +200muC/kg forming the the space charge of approximately 13muC/m^3. The flashover voltage and the time lag to flashover were measured when 1.2X50mu s impulse voltage applied to a rod-sphere gap within the charged cloud. Flashover voltage for positive rod markedly increased within positive charged cloud by increasing the charge-to-mass ratio. The increase of flashover voltage was up to 80% in comparison with flashover voltage within uncharged droplets. Flashover voltage for negative rod decreased about 20% in the cloud of either polarity. The results show that charged droplets in the gaps affect discharge process significantly.
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