Quantitative Method for Ultrasonic Testing of Lead Seal Defects in High Voltage Cable Accessories

Phased array ultrasound technology has demonstrated its capability in detecting lead seal defects within high-voltage cable terminals. However, conventional ultrasound quantitative methods often fall short in accurately measuring the dimensions of these defects. This paper introduces a novel method for the detection and quantification of lead seal defects in high-voltage cable terminals. By focusing on the longitudinal wave fan scan images of these defects and integrating threshold segmentation with corrosion algorithms, the method provides real-time information on defect characteristics, including cross-sectional area and height. The findings reveal significant improvements over the traditional −6dB method: a 5% reduction in distance error, a 10% enhancement in defect size accuracy, and an overall accuracy rate exceeding 85%. This research holds substantial reference value for the engineering application of lead sealing defect detection in high-voltage cables, contributing to the advancement of lead sealing technology and ensuring the reliability and safety of power grid operations.