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High resistance of surface fluorinated epoxy insulators to surface discharge in SF6 gas.

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Title: High resistance of surface fluorinated epoxy insulators to surface discharge in SF6 gas.
Authors: Que, Longkai1, An, Zhenlian1, Ma, Yong1, Shan, Fangting1, Zhang, Yingyao1, Zheng, Feihu1, Zhang, Yewen1
Source: IEEE Transactions on Dielectrics & Electrical Insulation. Feb2018, Vol. 25 Issue 1, p245-252. 8p.
Subjects: Epoxy insulators, Electric resistance, Fluorination, Surface discharges (Electricity), Alternating currents, Fourier transform infrared spectroscopy
Abstract: Our recent studies have indicated that direct fluorination can suppress surface charge accumulation of epoxy resin insulators and thus enhance the DC flashover performance. It was also confirmed that the fluorinated epoxy surface layer has a significantly improved resistance to corona discharge. Further, in this work, the degradation or tracking resistance to surface discharge and the AC flashover performance of the surface fluorinated epoxy insulator were investigated. A sheet sample/finger electrode arrangement was used in the AC flashover test in SF6 gas. The sample/electrode arrangement can keep the discharge along the same surface path for successive flashover tests, and thus can cause a lasting damage of the sample surface. Test results show that the fluorinated epoxy surface layer has a high degradation or tracking resistance, although direct fluorination only leads to a marginal increase in AC flashover voltage for the sample/electrode arrangement. The resistance improvement is mainly attributed to the formation of C-F bonds and the disappearance of conjugated double bonds in the surface layer by substitution and addition of fluorine atoms, as indicated by ATR-FTIR analysis. The marginal effect of the fluorination on AC flashover voltage is due to limited surface charge accumulation for the symmetrical sample/electrode arrangement during the short period between the partial discharge initiation and the occurrence of flashover. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Dielectrics & Electrical Insulation is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: High resistance of surface fluorinated epoxy insulators to surface discharge in SF6 gas.
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  Data: <searchLink fieldCode="AR" term="%22Que%2C+Longkai%22">Que, Longkai</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22An%2C+Zhenlian%22">An, Zhenlian</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ma%2C+Yong%22">Ma, Yong</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Shan%2C+Fangting%22">Shan, Fangting</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Yingyao%22">Zhang, Yingyao</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zheng%2C+Feihu%22">Zheng, Feihu</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Yewen%22">Zhang, Yewen</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22IEEE+Transactions+on+Dielectrics+%26+Electrical+Insulation%22">IEEE Transactions on Dielectrics & Electrical Insulation</searchLink>. Feb2018, Vol. 25 Issue 1, p245-252. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Epoxy+insulators%22">Epoxy insulators</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+resistance%22">Electric resistance</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorination%22">Fluorination</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+discharges+%28Electricity%29%22">Surface discharges (Electricity)</searchLink><br /><searchLink fieldCode="DE" term="%22Alternating+currents%22">Alternating currents</searchLink><br /><searchLink fieldCode="DE" term="%22Fourier+transform+infrared+spectroscopy%22">Fourier transform infrared spectroscopy</searchLink>
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  Label: Abstract
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  Data: Our recent studies have indicated that direct fluorination can suppress surface charge accumulation of epoxy resin insulators and thus enhance the DC flashover performance. It was also confirmed that the fluorinated epoxy surface layer has a significantly improved resistance to corona discharge. Further, in this work, the degradation or tracking resistance to surface discharge and the AC flashover performance of the surface fluorinated epoxy insulator were investigated. A sheet sample/finger electrode arrangement was used in the AC flashover test in SF6 gas. The sample/electrode arrangement can keep the discharge along the same surface path for successive flashover tests, and thus can cause a lasting damage of the sample surface. Test results show that the fluorinated epoxy surface layer has a high degradation or tracking resistance, although direct fluorination only leads to a marginal increase in AC flashover voltage for the sample/electrode arrangement. The resistance improvement is mainly attributed to the formation of C-F bonds and the disappearance of conjugated double bonds in the surface layer by substitution and addition of fluorine atoms, as indicated by ATR-FTIR analysis. The marginal effect of the fluorination on AC flashover voltage is due to limited surface charge accumulation for the symmetrical sample/electrode arrangement during the short period between the partial discharge initiation and the occurrence of flashover. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of IEEE Transactions on Dielectrics & Electrical Insulation is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1109/TDEI.2018.006621
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        Text: English
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        Type: general
      – SubjectFull: Electric resistance
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      – SubjectFull: Fluorination
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      – SubjectFull: Surface discharges (Electricity)
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      – SubjectFull: Alternating currents
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      – SubjectFull: Fourier transform infrared spectroscopy
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      – TitleFull: High resistance of surface fluorinated epoxy insulators to surface discharge in SF6 gas.
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              Text: Feb2018
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              Y: 2018
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