Hybrid method for analysis of operation state of the composite insulator

Composite insulator has been widely used in high-voltage power system; besides, its service life is getting longer and longer. Accordingly, the aging of the composite insulator has been paid more and more attention by the people, and how to comprehensive evaluate the aging state of composite insulator in service is great important to ensure the reliability of the transmission line. In this paper, the nodal discontinuous Galerkin method is for the first time used to analyze the electric field distribution on the surface of composite insulator, and the deformation of composite insulator is analyzed by the finite element method. Based on the numerical analysis for the surface electric field distribution and deformation of the composite insulator, the operation state of which is evaluated, and then it will help establishing a new method for evaluating the operation state of composite insulators and high-voltage tower, and a collective evaluating model for completing the aging properties of composite insulators. Finally, an on-line monitoring method is designed to monitor the deformation of the insulator by the strain gauge embedded in the composite insulator surface, thus monitoring the running state of insulator strings in real time.