Pressure-resistant insulating cylinder null for lightening protection insulator

摘要

PURPOSE:To realize a small thickness of a pressure-resisting insulating tube and a small size of a lightning insulator by forming pressure discharge slits to the pressure-resisting insulating tube. CONSTITUTION:At the top periphery of a cylindrical weather-proof pressure- resisting insulating tube 1 which consists of a pressure-resisting reinforced resin, an electrode metal 3 at the earthing side is geared and fixed with an adhesive 2. At the inner surface of the pressure-resisting insulating tube 1, slits 1a for pressure discharge purpose are formed at plural positions in the longitudinal direction parallel each other and at equal intervals, preventing the linking in the radius direction each other. These slits 1a are formed up to near electrode metals 3 and 4 shown in the figure. As a result, even when the arc in a high temperature and a high voltage is generated, the arc in the pressure-resisting insulating tube 1 is discharged to the outside, and the rise of the pressure inside the pressure-resisting tube 1 can be reduced. Consequently, the thickness of the pressure-resisting insulating tube 1 can be reduced, and a compact size of lightning insulator can be realized accordingly.