Traditional insulator testing methods mainly include the ball discharge method, infrared thermal imaging method, and leakage current detection method. The ball discharge method analyzes the voltage distribution of the insulator by measuring the distance between the balls at both ends during discharge, but it requires frequent adjustments to the ball distance and has a high false positive rate. The infrared thermal imaging method displays the surface temperature difference between defective and good insulators through thermal images, but it is difficult to operate in the field. The leakage current detection method determines the integrity of the insulator by measuring the magnitude of the leakage current. These methods are all qualitative tests and cannot accurately reflect the resistance value of each insulator, nor can they identify critical damage states where leakage has occurred but not yet broken down.
Advanced vibration acoustic flaw detection technology can perform inspections without power interruption. Its principle is that healthy post porcelain insulators have a fixed vibration frequency. Once internal cracks or damage occur, the structure is disrupted, and the vibration frequency changes. During operation, the testing equipment emits a special excitation vibration wave to the insulator, and simultaneously uses sensors to capture the insulator's vibration feedback wave. By analyzing the waveform frequency, the integrity of the insulator is determined, and the location of the defect is pinpointed. The advantage of this technology is that it can detect hidden defects without power outages or disruptions to the power supply, and it boasts high detection efficiency and accuracy.
