82 / 2017-03-10 20:51:49

Flashover Characteristics of Epoxy Resin Insulator in High-speed Charged Sand Environment

13064,13063,13062,13061

To ascertain flashover characteristics of the roof insulator in high-speed charged sand environment, experiments of epoxy resin insulator flashover characteristics in pure high-speed airflow, high-speed sand, high-speed charged sand environment are carried out based on an artificial experimental wind-tunnel platform and charge-mass ratio measurement device of dust. The influence of airflow speed, sand and charged sand on the flashover characteristics of epoxy resin insulator is investigated by simulation. Results show that, in the pure high-speed airflow environment, the flashover voltage of insulator has an increase-decrease- increase variation trend with the increase of airflow speed. The flashover mechanism is due to the combined effects of airflow blowing effect and airflow density. In high-speed sand and high-speed charged sand environment, the flashover voltages decrease in turn compared with that in pure high-speed airflow environment with a decrease- increase variation trend (airflow speed>18m/s). But the variation trend with the increase of airflow speed slow down because sand and charged sand have negative influence on flashover voltage of insulator. Additionally, the nonuniformity of the electric field around the insulator increases remarkably which leads to the decrease of flashover voltage significantly. These research results can provide reference for design and protection of roof insulators in high-speed charged sand environment.