불평등전장에서 SF6 기체의 뇌임펄스절연파괴에 의해서 발생하는 방전광 특성

초록

Abstract - In this paper, the V-p characteristics, the V-t characteristics and the discharge luminous characteristics in inhomogeneous SF6 gas gap under the positive and negative lightning impulse voltages are presented. The test gap was composed of the plane-to-plane with a needle-shaped protrusion. The applied voltage and the prebreakdown current were measured by the electric field sensor and the shunt of 50 Ω, respectively. The discharge luminous events were observed by a photomultiplier tube. Also, the discharge growth paths were observed by a high-speed camera. In a consequence, the dielectric strengths and time to breakdown of SF6 gas gap under positive lightning impulse voltages were independent of the gas pressure. In the presence of the positive polarity, the branches of discharge channel were created at high gas pressure, the length of the discharge paths were long, but the time to breakdown was short.