Abstract
The cable accessories constitute a vulnerable element and are prone to failures in the operation of power transmission lines. To investigate the changes in the electrical performance and aging state of high-voltage cable accessories with different operating time, the volume resistivity, breakdown electric field, dielectric constant, and trap parameters of insulation samples taken from retired cable accessories were characterized. The results indicate that there is a certain correlation between the macroscopic dielectric characteristics of cable accessory insulation and its aging state. With the increase of operating time, the volume resistivity and breakdown electric field decrease, while the dielectric constant initially increases and then decreases. The trap distribution of cable accessory insulation can effectively reflect its aging state. With the increase of operating time, the trap energy levels of the accessory insulation become shallower, and the trap density increases. The trap results of the accessory insulation show good consistency with the resistivity and breakdown field strength. Clustering analysis is also used to classify the test data, and the results validate that the trap energy levels and trap density of the insulation samples have better correlation with the insulation aging state of cable accessories than macroscopic dielectric parameters.
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