The position of internal conductors in high-voltage ceramic sleeves can be noncontactly and nondestructively tested using terahertz time-domain testing technology.By utilizing time-domain pulse signals for non-contact testing

it confirms the ability of the signals to penetrate through the ceramic sleeves outer wall and reach the internal conductor.Through analyzing the time-of-flight of the pulse echoes

the spatial position of the conductor inside the sleeve is determined.Experimental results demonstrate the accuracy of the method in detecting the position of the prefabricated conductor and ascertaining the presence or absence of the internal conductor.The detection effect is straightforward

facilitating easy judgment of the normality of the conductors position within the sleeve.This research offers novel ideas and establishes a methodological foundation for the health evaluation of ceramic sleeves in power systems.