Creepage Discharge Propagation on Charged Dielectric Surface in SF&lt;sub&gt;6&lt;/sub&gt; Gas and Its Optical Observation

Hikita, Masayuki; Ishida, Y.; Hayakawa, Naoki; Kito, Yukio; Ōkubo, H.

doi:10.1541/ieejpes1990.115.2_180

Cited by 7 publications

(2 citation statements)

References 7 publications

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“…Although, the research on the LN2 insulation has been going on for many decades [16][17][18], but the studies on its arc quenching characteristics were started in early 2016 [19].The Optical observation of arcs is an important investigation for the in-depth realization of the arc plasma physics. This study has extensively been done in gas [20,21], liquid [22][23][24], solid [25,26], solid-liquid interfaces [27,28] and composite dielectric systems [29] for many decades. It also has been done for cryogenic dielectrics such as liquid helium [30] and liquid-gas phase dynamics [20] etc.…”

Section: Introductionmentioning

confidence: 99%

Optical observation of arcs in liquid nitrogen

et al. 2023

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Liquid Nitrogen (LN2) has good insulation and arc-quenching properties. It can minimize the switchgear losses to a low level due to its cryogenic nature. Optical observation of LN2-arcs is very important for the future design of the Liquid Nitrogen Insulated metal enclosed Switchgear (LNIS). It would help in determining the spacers sizing, and the clearance distances between the LN2 Switch and the other equipment inside the LNIS system. Until now, no one has ever done the optical analysis of high-luminance arcs in the LN2 environment. The objective of this work was to determine the shape, size and current-density effects of arc plasmas in LN2. One type of electrode geometry and three types of electrode materials were used to study the LN2-arc characteristics. The influence of cryogenic environment on the arcs were thoroughly studied. Results showed that the arcs in LN2 have a direct relationship with the applied voltages, interrupting currents and the magnetic fields. The higher the interrupting current, the larger is the size of the arc. It was also observed that different electrodes materials have different shapes of arc plasmas. Magnetic fields can significantly influence the LN2-arc by increasing its size, patterning its shape and reducing its arcing time.

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Section: Introductionmentioning

confidence: 99%

Optical observation of arcs in liquid nitrogen

et al. 2023

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“…A 3mm-wide negatively charged area having a fixed potential Vs and a uniform distribution was formed on the surface of each sample by dc partial discharges [10]. Measurements described below were performed for the charged area of a uniform distribution and a relatively small width.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Impulse Creepage Discharge Propagation on Charged Dielectric Surface in SF<sub>6</sub> Gas

et al. 1996

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This paper describes the mechanism of creepage discharge propagation on charged dielectric surface in SF6 gas. Experimental results revealed that the surface charging having the opposite polarity to the applied impulse voltage increased the discharge extension length by enhancing the electric field strength at the discharge head. The charging potential of-12 kV for the 1 mm-thick PMMA sample doubled the mean step length and halved the pulse interval of stepwise discharge propagation. The influence of the charged surface on creepage discharge propagation was interpreted in terms of two processes: (a) streamer propagation and (b) streamer-to-leader transition based on the precursor mechanism.

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