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In order to study the faults and problems of power cables during operation, this paper proposes a method for analyzing the defects of the cable itself based on broad-band impedance. First, build a transmission line model based on transmission line theory,propose an improved method for capacitance testing method and test the parameters of the defective cable capacitance; then through the modeling of the defects of the cable itself, the types of different defects were compared;finally, analyze the changes in the amplitude and phase of the cable input impedance spectrum when there are serious defects in the cable. At the same time, the influence of different types of defects on the resonant frequency of the input impedance is studied, and the aging of the cable is characterized by the change of frequency.
Inspec keywords: power cables; transmission line theory
Subjects: Power cables; Transmission line theory