Successful detection of insulation degradation in cables by frequency domain reflectometry

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationMinerals, Metals and Materials Series
PublisherSpringer International Publishing
Pages1293-1301
Number of pages9
ISBN (Print)9783030046385, 9783030046392, 9783319515403, 9783319651354, 9783319728520, 9783319950211
DOIs
Publication statusPublished - 2019 Jan 1
Event18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019 - Boston, United States
Duration: 2019 Aug 182019 Aug 22

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

Conference18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019
CountryUnited States
CityBoston
Period19/8/1819/8/22

Fingerprint

Insulation
Cables
Degradation
Organic polymers
Electromagnetic waves
Inverse transforms
Fourier transforms
Polymers
Permittivity
Oxygen
Oxidation

Keywords

  • Aging
  • Cable
  • Characteristic impedance
  • Condition monitoring
  • Fault location
  • Insulation diagnosis
  • Polymeric insulation

ASJC Scopus subject areas

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

Cite this

Ohki, Y., & Hirai, N. (2019). Successful detection of insulation degradation in cables by frequency domain reflectometry. In Minerals, Metals and Materials Series (pp. 1293-1301). (Minerals, Metals and Materials Series). Springer International Publishing. https://doi.org/10.1007/978-3-030-04639-2_83

Successful detection of insulation degradation in cables by frequency domain reflectometry. / Ohki, Yoshimichi; Hirai, Naoshi.

Minerals, Metals and Materials Series. Springer International Publishing, 2019. p. 1293-1301 (Minerals, Metals and Materials Series).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ohki, Y & Hirai, N 2019, Successful detection of insulation degradation in cables by frequency domain reflectometry. in Minerals, Metals and Materials Series. Minerals, Metals and Materials Series, Springer International Publishing, pp. 1293-1301, 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019, Boston, United States, 19/8/18. https://doi.org/10.1007/978-3-030-04639-2_83
Ohki Y, Hirai N. Successful detection of insulation degradation in cables by frequency domain reflectometry. In Minerals, Metals and Materials Series. Springer International Publishing. 2019. p. 1293-1301. (Minerals, Metals and Materials Series). https://doi.org/10.1007/978-3-030-04639-2_83
Ohki, Yoshimichi ; Hirai, Naoshi. / Successful detection of insulation degradation in cables by frequency domain reflectometry. Minerals, Metals and Materials Series. Springer International Publishing, 2019. pp. 1293-1301 (Minerals, Metals and Materials Series).
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