Broadband Impedance Spectroscopy for Locating and Detecting Various Type of Degraded Portion along with Polymeric Cable

The problem that often occurs in the field is the occurrence of soft defects that occur when installing cables due to various factors such as being pinched, punctured, or peeled. Over last year, many methods are based on non-destructive tests such as Line Resonance Analysis (LIRA), Broadband Impedance Spectroscopy (BIS). Time Domain Reflectometry, Joint Time-Frequency Domain Reflectometry is carried out. Although some of these test methods have been able to detect local degradation but to interpret the type of defect is still infancy. This work uses the BIS method with RG 58 CU cable of 33.5 meters total length. The degraded portion is done by using several types, the first is to use mechanical damage by bending beyond the cable's tolerance limit damage, and the second is by connecting the resistance (100 Ohm) or capacitance (10nF) value using the T joint connector. The results are comparing by simulation with ANSYS Electronics Desktop. The results are the type of defect caused by the mechanical press, and the peeled parts have different characteristics. Besides, the IT transform method and IFFT method both of them can detect precisely the degraded portion at 18.5 meters long of 33.5 meters total length of the cable under test.