From a technical perspective, partial discharge testing equipment is primarily based on principles such as electromagnetic induction, acoustic wave detection, or ultrasonic wave detection. Electromagnetic induction locates the discharge source by detecting the electromagnetic pulse signal generated by the discharge; acoustic wave detection utilizes the acoustic wave signal generated by the discharge for location and identification; while ultrasonic wave detection further improves the sensitivity and accuracy of detection, making it particularly suitable for testing gas-insulated equipment. The combined application of these technical principles enables partial discharge testing equipment to accurately capture discharge signals in complex and variable electrical environments.