Feasibility analysis of polymeric material insulator applied to phase to earth insulation of transmission line

Transmission lines exposed to the atmosphere in long terms may get easily affected by wind, icing and other factors which may lead to jumping and galloping, reduce the inter-phase clearance and cause flashover as a result. To avoid these, this paper applies polymeric material insulator to the line-to-earth, which means some spot through the span is linked to a ground anchor by the specialized polymeric material considering its better performance of anti-pollution flash-over, higher mechanical strength, lighter weight and less maintenance compared with traditional material. In order to investigate the effects of the line-to-earth applying the polymeric material insulator, the conductor-insulator-ground system has been simulated in this paper to calculate the sag, the inter-phase clearance and the dynamic amplitude. Different suspension points and material properties including diameter and mass have been analyzed and compared to provide proposal for line application. Furthermore, the simulation results have been compared with not only some other measures but also the results of the field test. The simulation results show that the dynamic amplitude gets smaller and the phase-to-phase clearance is enough when the polymeric material insulator is installed and the comparisons verify the accuracy of the simulation method, the feasibility and effectiveness of this measure. So it is a useful solution to reduce jumping and galloping by using specific polymeric material insulator.