High Voltage Direct Current (HVDC) systems are increasingly being adopted around the world to integrate renewable resources, increase power transfer, and allow flexible grid operation. HVDC overhead lines play a critical role in this, focus is needed on research of composite outdoor insulators failure. In case pole ground fault bipolar scheme, healthy experiences slow transient overvoltage simi...

In this study, Sendust (Fe85Si9.6Al5.4) nanostructure alloy was prepared bymechanical alloying and was characterized by X-ray diffraction. In addition, the alloy’smorphology and its distribution particle size were investigated by scanning electronmicroscopy method. The alloyed powders were insulated with 4wt% of three differentinsulating materials including polyvinyl alc...

Through spatial electric field monitoring, it is expected to realize insulator pollution condition monitoring and contamination flashover warning in a non-contact way. Therefore, this paper, the distribution characteristics of 110 kV composite insulators are simulated, where effects different surface states their discharge levels on analyzed. On basis, method for based proposed. The results sho...

Abstract The abnormal heating of composite insulators will accelerate the deterioration insulation materials, which lead to at high-voltage end due increase dielectric loss. In this study, a finite element multi-physical field simulation was adopted and combined with actual test results. Four kinds electric-thermal coupling models 1000 kV insulator were established, namely, new, aged, aged defe...