Spatial Resolution between Two Abnormalities in a Cable by Frequency Domain Reflectometry

Yoshimichi Ohki, Naoshi Hirai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The spatial resolution of a cable fault location method by frequency domain reflectometry was examined experimentally by giving two abnormalities intentionally along a 31.5-m coaxial cable. As a result, two clear signal peaks appear, which can locate the presence of two hot spots perfectly if they are separated by more than 30 cm at a position about 15 m from the cable end with a measuring device. In addition, a clear signal peak with a small shoulder is recognized if the two hot spots are 1 cm away. Although the abnormalities were given in this research by heating the cable using tape heaters, the spatial resolution should be theoretically similar for any type of fault in a cable as long as it changes the characteristic impedance of the cable.

Original languageEnglish
Pages (from-to)822-826
Number of pages5
JournalIEEJ Transactions on Electrical and Electronic Engineering
Issue number6
Publication statusPublished - 2021 Jun


  • cable
  • characteristic impedance
  • electrical insulation
  • fault location
  • preventive maintenance

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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