Influence of Surface Resistivity on Flashover Properties of Epoxy Insulator in Arc-decomposed SF6 Gas

Miyashita, Makoto; Minagawa, Tadao; Inami, Kiyoshi; Itoh, Hiromi; Koyama, Hiroki; Nagao, E.

doi:10.1109/icpadm.2006.284127

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…It was shown that the reduction of the surface resistivity caused the transition from capacitive field to resistive field, which changed the electric field distribution. It was shown by the electric field calculation that this transition occurred drastically near 10 10 ohm/square under AC waveform [8]. It was also experimentally confirmed that the flashover voltage showed monotone decreasing as the reduction of the surface resistivity in the range of more than 10 10 ohm/square [8].…”

Section: Resultssupporting

confidence: 50%

“…It was shown by the electric field calculation that this transition occurred drastically near 10 10 ohm/square under AC waveform [8]. It was also experimentally confirmed that the flashover voltage showed monotone decreasing as the reduction of the surface resistivity in the range of more than 10 10 ohm/square [8]. Thus the coated film having high surface resistivity is appropriate.…”

Section: Resultsmentioning

confidence: 49%

“…The influence of the electrical surface resistivity on the flashover properties was previously investigated by several researchers [5][6][7][8]. It was shown that the reduction of the surface resistivity caused the transition from capacitive field to resistive field, which changed the electric field distribution.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Electrical surface resistivity of organic coating resin in arc-decomposed SF6 gas

Minagwa

Kohyama

Yoshitomo

et al. 2006

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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The electrical surface resistivity of polymer base coating was investigated in arc-decomposed SF 6 gas. The thickness of more than 100 um was found necessary to prevent the adverse effect of arcdecomposed SF 6 gas, which penetrated the coated film and deteriorated the insulation properties of the base material. The effect of the cure condition of the coated film was also investigated by using differential scanning calorimeter (DSC). An endothermic peak due to uncured agent, which reduced the surface resistivity in arc-decomposed SF 6 gas, was observed.

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Section: Resultssupporting

confidence: 50%

Section: Resultsmentioning

confidence: 49%

See 1 more Smart Citation

Electrical surface resistivity of organic coating resin in arc-decomposed SF6 gas

Minagwa

Kohyama

Yoshitomo

et al. 2006

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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“…In AC gas insulated equipment, the high permittivity and low surface conductivity of the insulator result in a macroscopic electric field distortion, which have been assumed as inducers to the surface flashover [8][9][10]. Meanwhile, it was reported that the contact resistivity on the metal-insulator interface forms a fixed charge layer, influencing the surface flashover voltage significantly [11].…”

Section: Introductionmentioning

confidence: 99%

Luminescence reveals micro discharge as a potential triggering factor for surface flashover

Lin¹,

Xu²,

Chen³

et al. 2020

J. Phys. D: Appl. Phys.

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The undetermined surface flashover of insulators limits the development of ultra-high voltage AC gas insulated equipment. In this paper, we report a micro discharge potentially triggered surface flashover phenomenon, which is revealed directly by luminescence activities of samples with different micro morphologies. The results show that sandblasted samples, which are prone to a lower surface flashover voltage, present luminescence pulses corresponding to micro discharge activities over the surface. Polished samples have the mold release agent layer removed and inhibit local micro ionization, which eliminates the pulse luminescence and improves the surface flashover voltage. This paper brings novel ideas to insulation surface flashover mechanism under AC voltage and lays a foundation for further developing high reliable gas insulted equipment.

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“…Electrical discharges in GIS are accompanied by formation of SF 6 decomposition products and generation of heat as well as the emission of UV radiation. It has been reported that surface insulation properties of epoxy spacers would be reduced by the corrosive decomposition products, such as F 2 , S 2 F 10 , SF 4 and S 2 F 2 , particularly when silica is used as filler [26]. We can expect good corrosion resistance to the corrosive decomposition products for the fluorinated epoxy surface layer although this needs to be verified in future work, but cannot predict how UV radiation influences the fluorinated epoxy surface layer or its electrical properties and physicochemical characteristics.…”

Section: Introductionmentioning

confidence: 99%

Evolutions of surface characteristics and electrical properties of the fluorinated epoxy resin during ultraviolet irradiation

Yin

Xiao

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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The photoinduced evolutions of surface physicochemical characteristics and electrical properties of the fluorinated epoxy resin have been investigated. Cured epoxy resin sheets were surface fluorinated in a laboratory vessel using a F 2 /N 2 mixture with 12.5% F 2 by volume at 0.1 MPa and 95 °C for 30 min. The fluorinated epoxy sample together with the unfluorinated (original) one for a comparison were exposed to ultraviolet (UV) radiation with wavelengths of 320 to 390 nm. During UV exposure, the evolution of surface physicochemical characteristics was investigated by attenuated total reflectance Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray energy dispersive spectroscopy, and the sessile drop technique. The corresponding evolution of surface electrical properties was evaluated by measurements of surface potential decay and surface conductivity. These results have shown that the crosslinking reaction rather than photodegradation occurred for the fluorinated sample, compared to a continuous degradation of the original sample during the UV exposure. These results also indicate that surface conduction and its sensitivity to humidity increased very significantly with UV exposure time for the original sample, while the opposite changes in surface conduction and its moisture sensitivity with the exposure time were found for the fluorinated sample. A relationship between the evolutions of surface electrical properties and surface physicochemical characteristics has been established.

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Influence of Surface Resistivity on Flashover Properties of Epoxy Insulator in Arc-decomposed SF6 Gas

Cited by 6 publications

References 4 publications

Electrical surface resistivity of organic coating resin in arc-decomposed SF6 gas

Electrical surface resistivity of organic coating resin in arc-decomposed SF6 gas

Luminescence reveals micro discharge as a potential triggering factor for surface flashover

Evolutions of surface characteristics and electrical properties of the fluorinated epoxy resin during ultraviolet irradiation

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