Development of evaluation method of surface electric charge on electric insulation strength in composition high electric field gaps
| Project/Area Number |
17560273
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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 | Fukuoka University |
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Principal Investigator |
NISHIJIMA Kiyoto Fukuoka University, Faculty of Engineering, Professor, 工学部, 教授 (40117205)
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| Co-Investigator(Kenkyū-buntansha) |
IZAWA Yasuji Fukuoka Univ., Faculty of Eng.Res., Assistant, 工学部, 助手 (10131806)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2005: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | Electric power engineering / Dielectric properties / Electric charge control / Electrical insulation / Pulsed laser |
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| Research Abstract |
I examined an effect of a charging with electricity electric charge to give electric insulation performance of a composition high electric field gap. Two main study examined what kind of influence electric insulation performance received by dielectric surface charging with electricity and floating metal particle charging with electricity.
As important results given from such a investigation, it is as follows.
(1) The electric charge distribution on the acrylic discs which is in diameter up to 32 cm depends on an acrylic disc diameter and also the de applied voltage magnitude and polarity.
(2) Natural decrement rate of an electric charge in a center of circular charging with electricity electric charge distribution is large and finds that quantity of electric charge falls in a center from a peripheral department.
(3) When we impressed the voltage of polarity reverse to a charging with electricity electric charge, the electric discharge onset voltage extremely decreases.
(4) In the case of a small metal steel particle inserted to a dc quasi-uniform high electric field gaps, we found a large fall of electric insulation strength by the electric field reinforcement due to the electric charge and the presence of particle.
(5) Just before the sparkover takes place, the metal particle has the electric charge in the range of 100 to 800 pC.
(6) By model numerical analysis in consideration of the surface electric charge on the metal particle, we show that the abnormal reduction of the breakdown voltage has been estimated.
From these results, the sparkover voltage under ac applied voltage would be much more reduced by the electric charge of the particle.
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Report
(3 results)
Research Products
(20 results)
