Evaluation of Aging Characteristics of Composite Insulators Based on Polarization/Depolarization Current Method

To evaluate the aging state of composite insulating materials quickly and accurately, this paper proposes a method based on polarization/depolarization current method. High polymer epoxy is selected as the research object. The UV aging test is performed on epoxy materials, and the polarization/depolarization current method is used to detect the aging state of the materials. Through the analysis of the polarization and depolarization current curve, the initial value, stable value and turning time of polarization and depolarization current are extracted as the characteristics of the aging state of the epoxy material. Comparing the polarization/depolarization current curves and their characteristic values of materials with different aging degrees, it can be found that the initial value, stable value and turning time of polarization and depolarization current are closely related to the aging degree of materials in the polarization and depolarization stages. The results show the more serious the aging of epoxy materials, the greater the polarization and depolarization current. The results show that the polarization / depolarization current method can effectively evaluate the aging characteristics of composite insulator.