• 제목, 요약, 키워드: Free conducting wire particle

검색결과 4건 처리시간 0.04초

Experimental Studies on the Motion and Discharge Behavior of Free Conducting Wire Particle in DC GIL

  • Wang, Jian;Wang, Zhiyuan;Ni, Xiaoru;Liu, Sihua
    • Journal of Electrical Engineering and Technology
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    • v.12 no.2
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    • pp.858-864
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    • 2017
  • This study aims to restrain free conducting wire-type particles which are commonly and dangerously existing within DC gas-insulated transmission lines. A realistic platform of a coaxial cylindrical electrode was established by using a high-speed camera and a partial discharge (PD) monitor to observe the motion, PD, and breakdown of these particles. The probabilities of standing or bouncing, which can be affected by the length of the particles, were also quantitatively examined. The corona images of the particles were recorded, and particle-triggered PD signals were monitored and extracted. Breakdown images were also obtained. The air-gap breakdown with the particles was subjected to mechanism analysis on the basis of stream theory. Results reveal that the lifting voltage of the wire particles is almost irrelevant to their length but is proportional to the square root of their radius. Short particles correspond to high bouncing probability. The intensity and frequency of PD and the micro-discharge gap increase as the length of the particles increases. The breakdown voltage decreases as the length of the particles decreases.

$SF_6$ 가스 동축원통전극 내의 금속이물이 절연파괴에 미치는 영향 (The Effect on Breakdown of the Conducting Particles Between Coaxial Cylindrical Electrodes in $SF_6$ Gas)

  • 조국희;권동진;이강수;곽희로
    • 조명전기설비학회논문지
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    • v.12 no.2
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    • pp.85-90
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    • 1998
  • 본 논문에서는 AC 전압 하에서 자유 도전성 금속이물 혼입에 의한 SF6 가스로 압축된 GIS의 절연특성에 관하여 연구하였다. GIS 내에서 자유 도전성 금속이물이 혼입되면 절연파괴 전압을 낮추는 결정적인 역할을 할 수 있으므로, 금속이물의 재질과 크기에 따른 부상전계 및 절연파괴전압을 측정하였다. 구리, 철, 알루미늄의 선형 금속이물에서의 부상전계 계산값과 측정값을 비교, 분석하였다. 압축된 $SF_6$ 가스로 절연된 동축원통전극간에 금속이물의 혼입될 경우의 절연파괴전압은 금속이물의 없을 때보다 낮게 나타났으며, 금속이물의 재질과 크기에 상당히 의존하였다. 따라서 자유도전성 금속이물은 GIS의 절연파괴 특성에 매우 중요한 요소로 작용함을 알 수 있었다.

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GIS내에 함유된 자유 도전성 파티클의 거동해석 (A Numerica analysis on the lift-off motion of Free Conducting Particle in GIS)

  • 이방욱;구자윤
    • 대한전기학회:학술대회논문집
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    • pp.1925-1928
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    • 1996
  • In this work, the behavior of conducting wire type particles existing inside the cylinder type coaxial electrode has been systematically investigated by charge simulation method and electrostatic force analysis from the view point of the acquired charging before being lifted off into the gap under the high ac voltage. Spheroidal charge are adopted as a image charge for the CSM analysis in order to calculate the acquired charges of the particles which are erected on the surface of the outer electrode. For this purpose, different material of the particle and their lengths and diameters have been considered in view to calculate their lift-off field, acquired charge and to understand their effect on the lift-off voltage. The results imply that the particle lengths and diameter have an different influence on the particle behavior in GIS system.

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A Critical Note on the Electric Field in Direct and Alternating Current and Its Consciousness

  • Oh, Hung-Kuk
    • 한국감성과학회:학술대회논문집
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    • pp.98-104
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    • 2000
  • The conventional model did not take momentum conservation into consideration when the electron absorbs and emits the photons. II-ray provides momentum conservations on any directions of the entering photons, and also the electrons have radial momentum conservations and fully elastic bouncing between two atoms, in the new atom model. Conventional atom model must be criticized on the following four points. (1) Natural motions between positive and negative entities are not circular motions but linear going and returning ones, for examples sexual motion, tidal motion, day and night etc. Because the radius of hydrogen atom's electron orbit is the order of 10$^{-11}$ m and the radia of the nucleons in the nucleus are the order of 10$^{-14}$ m and then the converging $\pi$-gamma rays to the nucleus have so great circular momentum, the electron can not have a circular motion. We can say without doubt that any elementary mass particle can have only linear motion, because of the $\pi$-rays'hindrances, nearthenucleus. (2) Potential energy generation was neglected when electron changes its orbit from outer one to inner one. The h v is the kinetic energy of the photo-electron. The total energy difference between orbits comprises kinetic and potential energies. (3) The structure of the space must be taken into consideration because the properties of the electron do not change during the transition from outer orbit to inner one even though it produces photon. (4) Total energy conservation law applies to the energy flow between mind and matter because we daily experiences a interconnection between mind and body. Conventional Concept of Electric Field must be extended in the case of the direct and alternating current. Conventional concept is based on coulomb's force while the electric potential in the direct and alternating current is from Gibb's free energy. And also conventional concept has not any consciousness with human being but the latters has a conscious sensibility. The cell emf is from the kinetic energy of the open $\pi$-rays flow through the conducting wire. The electric potential in alternating current is from that the trans-orbital moving of the induced change of magnetic field in the wire produces flows of open $\pi$-rays, which push the rotating electrons on the orbital and then make the current flow. Human consciousness can induce a resonance with the sensibility of the open $\pi$-rays in the electric measuring equipment. Specially treated acupunctures with Nasucon is for sending an acupunctural effect from one place to another via space by someone's will power.

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