obtaining a length parameter, a corrugation pitch parameter, radius parameters, and a thickness parameter of a power cable, wherein the power cable comprises a shield, a corrugated sheath, and a semi-conducting bedding layer between the shield and the corrugated sheath;

obtaining a first resistance value between the shield and the corrugated sheath, and calculating a second resistance value of the shield based on the length parameter and the corrugation pitch parameter;

calculating a radial resistance value of the semi-conducting bedding layer based on the first resistance value and the second resistance value;

determining a contact angle of a critical point of contact between the corrugated sheath and the semi-conducting bedding layer based on the radius parameters and the thickness parameter;

taking a plurality of points on a contact surface between the semi-conducting bedding layer and the corrugated sheath as base interpolation points;

taking an average value of the base interpolation points to obtain an interpolation data point;

obtaining coordinates of the interpolation data point, and constructing an interpolation function based on coordinates of a plurality of interpolation data points;

calculating first volume resistivity of the semi-conducting bedding layer in a resistance approximation mode based on the interpolation function, the radial resistance value, and the contact angle;

calculating second volume resistivity of the semi-conducting bedding layer in a conductance approximation mode based on the interpolation function, the radial resistance value, and the contact angle; and

determining total volume resistivity of the semi-conducting bedding layer based on the first volume resistivity and the second volume resistivity, and comparing the total volume resistivity with a preset evaluation parameter to obtain a defect detection result of the semi-conducting bedding layer.