| Project/Area Number |
15560263
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電力工学・電気機器工学
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| Research Institution | Toyama National College of Technology |
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Principal Investigator |
NISHI Toshiyuki Toyama National College of Technology, Electrical Engineering, Associate Professor, 電気工学科, 助教授 (30180574)
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| Co-Investigator(Kenkyū-buntansha) |
HANAOKA Ryoichi Kanazawa Institute of Technology, Electrical Engineering, Professor, 工学部, 教授 (90148148)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | aerial insulated wire / creeping discharge / lightning impulse / lightning countermeasure |
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| Research Abstract |
In high voltage aerial distribution systems, the aerial insulated wires are supported by the insulators and the binding wires at the electric light poles. When the lightning strike occurs in their neighborhood, a lightning surge is induced to the central line of the wire. If the flashover of insulator happens by the lightning surge, the creeping discharge can develop along the wire surface from free end of the binding wire. Then, the wires are exposed to danger of the wire melting failure. In order to prevent this accident, the elucidation of the creeping discharge is very important.
We investigated the property of creeping discharge which develops along the wire surface under the impulse voltage application with various peak values and duration of wave fronts. It has been clarified as follows.
1. Positive creeping discharge : (1) Length The length does not influenced by the duration of wave front Tf. It increases with the peak value of applied impulse voltage Vm. However, the length is suppressed with Tf. (2) Aspect It develops along the wire surface with jumping independent of Tf and Vm.
2. Negative creeping discharge : (1)Length The increase and decrease regions of the length appears in Tf ≒ 1.2μs. The decrease region reduces with the increase of Tf. The length increases with the increase of Vm in 8.0 ≦ Tf ≦ 100.0μs.
(2) Aspect The creeping discharge adheres to the wire surface at the tip of the binding wire and jumps from the wire surface at the tip of discharge at Vm ≧ 70kV in Tf ≒ 1.2μs. However, it adheres to the wire surface at the tip of discharge independent of Vm in Tf ≧ 8.0μs. It was clarified that the length of negative creeping discharge was closely related to the aspect.
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