Detailed Description
The insulators are assembled from porcelain components and upper and lower metal attachments bonded with adhesive. Elastic pads are placed between the porcelain surface and the bonded metal attachment areas. The porcelain bonding sections are designed with structures like sanding, knurling, and grooving to ensure mechanical strength and prevent loosening or twisting. The porcelain surface is evenly coated with white glaze, and the metal attachments are painted with gray magnetic paint.
The insulator porcelain component has two main structures: a cavity partition (penetrable) structure and a solid (non-penetrable) structure. The composite pillar insulators are generally solid and non-penetrable. The latter structure offers improved safety and reliability over the former, reducing maintenance and testing efforts.
The insulator porcelain pieces come in two shapes: with more or fewer棱. The more棱 shape increases the surface distance, offering superior electrical properties compared to the fewer棱 shape. All products except for the soon-to-be-phased-out extruded-jacketed pole insulators are of the more棱 shape.
Internal rubber assembly structure, due to the metal accessories being glued into the porcelain piece holes, it correspondingly increases the insulation distance and improves the electrical performance. At the same time, it reduces the space occupied during installation. However, since the internal rubber assembly is not conducive to improving mechanical strength, insulators with higher mechanical strength requirements should adopt a combined assembly method (i.e., the upper accessories use internal rubber assembly, and the lower accessories use external rubber assembly).
The disk-shaped suspended porcelain insulator for high-voltage overhead transmission and distribution lines is used for insulation and wire fixation. Generally, it is assembled into insulator strings for use on lines of various voltage levels.
Standard insulators are suitable for general areas; increasing the number of insulator discs can also enhance the anti-fouling performance if appropriate.
Suspended porcelain insulators are assembled using porcelain components, iron caps, and steel feet, bonded with a cementitious adhesive of not less than 525 grade silicate cement and quartz sand. The iron caps and steel feet have a thin coating of buffer layer on the surfaces in contact with the adhesive, and the top of the steel feet features an elastic pad. The porcelain surface is typically glazed with white or brown glaze, with other glazes available upon request. Both the iron caps and steel feet are fully hot-dip galvanized. The push-pull type elastic locking pins for spherical connections come in W and R types, both made of tin bronze, brass, and austenitic stainless steel, offering good elasticity and corrosion resistance, and easy assembly and disassembly. The cylindrical and saddle-shaped open pins for slot connections, the former being hot-dip galvanized, and the latter made of brass. The above elastic locking pins and cylindrical pins, etc., are zero insulators, divided into spherical and slot types based on the connection method.
Standard and anti-fouling insulators of the same strength grade, with identical ball socket connection dimensions, are interchangeable.
