The Aging Estimation of Polymer Insulation Based on Analytic Hierarchy Process

摘要

With the continuous expansion of the power system, the security and stability of the power distribution network are of particular importance. As the power distribution equipment's main insulation, polymer material has caused great concern for the department of operation and maintenance because of the degradation of mechanical and electrical properties. The comprehensive aging status of polymer insulation is needed and can be obtained from different aging indexes. The Analytical Hierarchy Process (AHP) can be used to determine the weight of each aging index. After analyzing large amounts of experimental results of the polymer insulation with different operating years in power distribution systems, the elongation at break, breaking strength, dielectric constant, dielectric loss and breakdown field strength were selected as the aging assessment parameters. An improved evaluation model with assessment parameters and aging index was also established according to the results. The analytic hierarchy process method was employed in this chapter to reduce single parameter error and improve the accuracy of the prediction model, combined with the sensitivity and correlation of the characteristic parameters. With assessing the aging index of an actual case, it is shown that the model is feasible and effective to provide a reference for optimizing the maintenance cycle of polymer insulation in power distribution networks.