Dynamic Eddy Current Testing of Transmission Line Defects Based on Differential Coils

Résumé fourni par la source

Dynamic Eddy Current Testing (DECT) is an advanced non-destructive testing technology based on the principle of electromagnetic induction. Due to its high sensitivity, it has been widely applied in detecting defects in complex transmission lines. However, the velocity effect induced by dynamic detection can lead to signal distortion, thereby affecting the detection performance and accuracy. This study investigates the impact of velocity on detection signals and aims to achieve dynamic localization of defects in transmission lines. By observing a “large-small-large” regular fluctuation trend in the signals, the defect location range is determined. Subsequently, the reverse spike phenomenon can be utilized for precise defect localization. The study further reveals that when the sensor moves too fast, the detection depth of the signal is significantly reduced, making it unable to detect defects in the inner aluminum strands and steel core layers. Conversely, when the sensor moves too slowly, the accuracy of defect location detection decreases significantly. This work validates the feasibility of dynamic eddy current testing for transmission line defects based on differential coils, enhances the application effectiveness of Dynamic Eddy Current Testing in transmission line inspection, and provides a reference for non-destructive testing in other fields.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.