Location attempt of a degraded portion in a long polymer-insulated cable

Yoshimichi Ohki, Naoshi Hirai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


The ability of frequency domain reflectometry (FDR) for locating a portion in a cable longer than 1.0 km, where either degradation or abnormality occurred in its insulation, was evaluated by conducting two experiments. First, a 72-m coaxial cable insulated with low-density polyethylene (LDPE) was locally degraded concurrently by heat at 100 °C with gamma irradiation to 312 kGy. Then, this cable was connected to two 1000-m coaxial LDPE cables at either end. Furthermore, a 2-m coaxial lead LDPE cable was connected to a network analyzer, forming a cable of a total length of about 2074 m. The FDR method successfully located the degraded portion and also the connecting points in this long cable. It has also become clear that the FDR method can locate a 30-cm part in a 1000-m coaxial LDPE cable at a position about 900 m from its end when it was heated temporarily using a ribbon heater.

Original languageEnglish
Article number8561354
Pages (from-to)2461-2466
Number of pages6
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Issue number6
Publication statusPublished - 2018 Dec


  • aging
  • broadband impedance spectroscopy
  • characteristic impedance
  • degradation
  • fault location
  • frequency domain reflectometry

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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