Successful detection of insulation degradation in cables by frequency domain reflectometry

Yoshimichi Ohki; Naoshi Hirai

doi:10.1007/978-3-030-04639-2_83

Successful detection of insulation degradation in cables by frequency domain reflectometry

Yoshimichi Ohki^*, Naoshi Hirai

^*Corresponding author for this work

Kagami Memorial Research Institute for Materials Science and Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English
Title of host publication	Minerals, Metals and Materials Series
Publisher	Springer International Publishing
Pages	1293-1301
Number of pages	9
ISBN (Print)	9783030046385, 9783030046392, 9783319515403, 9783319651354, 9783319728520, 9783319950211
DOIs	https://doi.org/10.1007/978-3-030-04639-2_83
Publication status	Published - 2019
Event	18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019 - Boston, United States Duration: 2019 Aug 18 → 2019 Aug 22

Publication series

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

Conference

Conference	18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019
Country/Territory	United States
City	Boston
Period	19/8/18 → 19/8/22

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

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10.1007/978-3-030-04639-2_83

Cite this

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

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title = "Successful detection of insulation degradation in cables by frequency domain reflectometry",

abstract = "We have succeeded in detecting the degradation of cable{\textquoteright}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.",

keywords = "Aging, Cable, Characteristic impedance, Condition monitoring, Fault location, Insulation diagnosis, Polymeric insulation",

author = "Yoshimichi Ohki and Naoshi Hirai",

note = "Funding Information: This research was partly supported by the Nuclear Regulation Authority in Japan as a part of the Ageing Management Program for System Safety. Publisher Copyright: {\textcopyright} 2019, The Minerals, Metals & Materials Society.; 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019 ; Conference date: 18-08-2019 Through 22-08-2019",

year = "2019",

doi = "10.1007/978-3-030-04639-2_83",

language = "English",

isbn = "9783030046385",

series = "Minerals, Metals and Materials Series",

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T1 - Successful detection of insulation degradation in cables by frequency domain reflectometry

AU - Ohki, Yoshimichi

AU - Hirai, Naoshi

N1 - Funding Information: This research was partly supported by the Nuclear Regulation Authority in Japan as a part of the Ageing Management Program for System Safety. Publisher Copyright: © 2019, The Minerals, Metals & Materials Society.

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

KW - Aging

KW - Cable

KW - Characteristic impedance

KW - Condition monitoring

KW - Fault location

KW - Insulation diagnosis

KW - Polymeric insulation

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SN - 9783319950211

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BT - Minerals, Metals and Materials Series

PB - Springer International Publishing

T2 - 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019

Y2 - 18 August 2019 through 22 August 2019

ER -

Successful detection of insulation degradation in cables by frequency domain reflectometry

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Keywords

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