Location of Damaged Insulation for an Underground Power Cable Under High-Frequency Model

This paper proposes a novel broadband impedance spectroscopy through a sweep frequency response analysis approach for estimating the position of damaged insulation, particularly the site of water treeing. Water treeing is an undiagnosed issue in cables that does not result in a partial discharge until a catastrophic failure happens. Therefore, an attempt was made to pinpoint this kind of cable damage using impedance spectroscopy in this research. In addition, an analytical method based on the frequency location of zeros and their cumulative total and product is suggested for estimating the location of water treeing of different sizes in the insulation. To validate the suggested equations, tests were conducted on the test cable to generate water treeing based on a model based on the literature.