Indoor post insulators of three element structures

The utility model relates to an indoor post insulators of three element structures establishes upper and lower accessory system at the upper and lower end of insulator, upper and lower accessory system comprises upper and lower insulation part and upper and lower current -carrying part, insulation part and current -carrying part in close contact with. Upper and lower accessory system's insulation part and the upper and lower termination of insulator touch, upper and lower accessory system's current -carrying part be conducting ring no. 1, two, the horizontal side surface at the last accessory system with insulator upper end contact is established to conducting ring no. 1, the perpendicular side surface at the lower accessory system who contacts with the insulator lower extreme is established to conducting ring no. 2. The utility model discloses when the electrode produces corona discharge, can attract the corona discharge electric charge, effectively improve the corona pickup voltage and the dry flashover vol