Abstract
When there is a slight water invasion on a power cable, the change of the cable impedance is not large enough and leads to a challenge for water invasion detection. Thus, in this work, a small auxiliary cable is proposed to be buried in a traditional cable, and used to detect the water invasion defects with frequency-domain reflection cascaded with discrete Fourier transform (DFT). In order to enhance the positioning resolution, Kaiser window is adopted during DFT. The experiment results show slight water invasion can be detected by using the auxiliary cable. Besides, during the defect detection, the terminals of the power cable are not required to be used to inject test signal. Thus, the proposed method can be carried out on-line without power outage.
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