In situ defect recognition analysis on long cables through nondestructive reflectometry and dielectric spectroscopy methods: a comparison
Résumé
In this paper the aging through high temperature of 10-meter long coaxial cables and its change in electrical properties have been investigated through non-destructive electrical techniques i.e. dielectric spectroscopy and time domain reflectometry. Both techniques allow changes of electrical properties to be revealed with aging, however, the coupling of these two techniques permits an effective cable aging assessment allowing also the recognition of local defects. Indeed, it has been demonstrated that dielectric spectroscopy is more sensitive when the cable is globally aged, while time domain reflectometry, in addition to a global investigation, can also single out aging occurring in limited portion of cable insulation (local aging).
Mots clés
instrumentation
aging
high temperature
cable
non-destructive electrical control
non-destructive testing
dielectric spectroscopy
reflectometry
defect
time domain reflectometry
cable insulation
Diagnosis
onsite measurements
cable diagnostics
lv cables
Fault Location
Coaxial Cable
Changes In Electrical Properties
Impedance
Low Voltage
Measurement Techniques
Power Plants
Dielectric Properties
Nuclear Power Plant
Electric Company
Vector Network Analyzer
Global Aging
Dielectric Measurements
Bulk Measurements
Cable System
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