Successful detection of insulation degradation in cables by frequency domain reflectometry

研究成果: Conference contribution

2 引用 (Scopus)

抜粋

We have succeeded in detecting the degradation of cable’s polymeric insulation well before its continual use becomes risky. Degradation of organic polymers is mainly caused by oxidation if the ambience around the cable contains oxygen. When organic polymers are oxidized, polar carbonyl groups are formed, by which the permittivity is increased. This in turn decreases the characteristic impedance of a polymer-insulated cable. If we inject electromagnetic waves in a very wide frequency range into the cable and measure the ratio of reflected power to injected power, the information on the effects of the characteristic impedance changes is included in the frequency spectra of the ratio. If we do inverse Fourier transform, we can convert the data to a time domain. Therefore, we can know the degraded portion by multiplying the velocity of electromagnetic waves in the cable.

元の言語English
ホスト出版物のタイトルProceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors
出版者Springer International Publishing
ページ77-85
ページ数9
ISBN(印刷物)9783319684536
DOI
出版物ステータスPublished - 2018 1 1
イベント18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017 - Portland, United States
継続期間: 2017 8 132017 8 17

出版物シリーズ

名前Minerals, Metals and Materials Series
Part F11
ISSN(印刷物)2367-1181
ISSN(電子版)2367-1696

Other

Other18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017
United States
Portland
期間17/8/1317/8/17

ASJC Scopus subject areas

  • Metals and Alloys
  • Materials Chemistry
  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Energy Engineering and Power Technology

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  • これを引用

    Ohki, Y., & Hirai, N. (2018). Successful detection of insulation degradation in cables by frequency domain reflectometry. : Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors (pp. 77-85). (Minerals, Metals and Materials Series; 巻数 Part F11). Springer International Publishing. https://doi.org/10.1007/978-3-319-68454-3_7