In the detection of power cable insulation defects

the accurate location and degree evaluation of insulation defects are crucial to the planned overhaul work of power cable. Taking XLPE coaxial cable as an example

in this paper

based on the transmission line distribution parameter model and the integral transformation theory

the impedance spectrum function of the power cable is decomposed through the e-2γx function system in the space domain

and a diagnostic function for insulation defects is proposed. By investigating the relationship between insulation defects and insulation defect function

an insulation defects detection method is proposed for the location and degree evaluation of L/C type insulation defects in power cable. The feasibility of the proposed detection method is verified by a simulation example

which can accurately locate and evaluate the degree of the insulation defects.