TY - JOUR
T1 - Location attempt of a degraded portion in a long polymer-insulated cable
AU - Ohki, Yoshimichi
AU - Hirai, Naoshi
N1 - Funding Information:
This research was partly supported by the Nuclear Regulation Authority in Japan through Ageing Management Technical Evaluation Enhancement Program.
Publisher Copyright:
© 2018 IEEE.
PY - 2018/12
Y1 - 2018/12
N2 - 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.
AB - 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.
KW - aging
KW - broadband impedance spectroscopy
KW - characteristic impedance
KW - degradation
KW - fault location
KW - frequency domain reflectometry
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U2 - 10.1109/TDEI.2018.007343
DO - 10.1109/TDEI.2018.007343
M3 - Article
AN - SCOPUS:85058237022
SN - 1070-9878
VL - 25
SP - 2461
EP - 2466
JO - IEEE Transactions on Dielectrics and Electrical Insulation
JF - IEEE Transactions on Dielectrics and Electrical Insulation
IS - 6
M1 - 8561354
ER -