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Assessment of Surface Degradation of Silicone Rubber Caused by Partial Discharge

Author

Listed:
  • Kazuki Komatsu

    (Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan)

  • Hao Liu

    (Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan)

  • Mitsuki Shimada

    (Information and Analysis Technologies Division, Nagoya Institute of Technology, Nagoya 466-8555, Japan)

  • Yukio Mizuno

    (Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan)

Abstract

This paper reports experimental and analytical results of partial discharge degradation of silicone rubber sheets in accordance with proposed procedures. Considering the actual usage condition of silicone rubber as an insulating material of polymer insulators, an experimental procedure is established to evaluate long-term surface erosion caused only by partial discharge. Silicone rubber is subjected to partial discharge for 8 h using an electrode system with air gap. Voltage application is stopped for subsequent 16 h for recovery of hydrophobicity. The 24 h cycle is repeated 50 or 100 times. Deterioration of sample surface is evaluated in terms of contact angle and surface roughness. It is confirmed the proposed experimental procedure has advantage of no arc discharge occurrence, good repeatability of results, and possible acceleration of erosion. Surface erosion of silicone rubber progresses gradually and finally breakdown of silicone rubber occurs. Alumina trihydrate (ATH), an additive to avoid tracking and erosion by discharge, is not necessarily effective to prevent breakdown caused by partial discharge when localized electric field in air is enhanced by adding ATH. In such a situation, lower permittivity and higher resistance of silicone rubber seem dominant factors to prevent partial discharge breakdown and a careful insulation design should be required.

Suggested Citation

  • Kazuki Komatsu & Hao Liu & Mitsuki Shimada & Yukio Mizuno, 2019. "Assessment of Surface Degradation of Silicone Rubber Caused by Partial Discharge," Energies, MDPI, vol. 12(14), pages 1-13, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:14:p:2756-:d:249509
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    References listed on IDEAS

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    1. Arshad & Azam Nekahi & Scott G. McMeekin & Masoud Farzaneh, 2016. "Flashover Characteristics of Silicone Rubber Sheets under Various Environmental Conditions," Energies, MDPI, vol. 9(9), pages 1-19, August.
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    Cited by:

    1. Ioannis F. Gonos & Issouf Fofana, 2020. "Special Issue “Selected Papers from the 2018 IEEE International Conference on High Voltage Engineering (ICHVE 2018)”," Energies, MDPI, vol. 13(18), pages 1-5, September.

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