Detailed Description
The insulators are assembled by gluing porcelain pieces with upper and lower metal attachments using an adhesive. Elastic pads are placed between the porcelain piece ends and the adhesive contact areas of the metal attachments. The porcelain pieces feature structures such as sandblasting, embossing, and grooving at the adhesive sections to ensure mechanical strength, prevent loosening, and twisting. The porcelain surface is evenly coated with white glaze, and the metal attachments are painted with gray magnetic paint.
The main structure of insulator porcelain components includes two types: a cavity partition structure (penetrable) and a solid (non-penetrable) structure. The composite pillar insulators are generally solid and non-penetrable. This latter structure offers improved safety and reliability compared to the former, reducing the maintenance and testing workload.
The insulator porcelain pieces come in two shapes: with more or fewer棱. The more棱 shape increases the surface distance, offering better electrical properties than the fewer棱 shape. All products except for the gradually being phased out rubber-insulated pillar insulators are of the more棱 shape.
An inner rubber-mounted structure, due to the metal accessories being rubber-sealed into the porcelain piece holes, correspondingly increases the insulation distance, enhancing electrical performance. It also reduces the space occupied during installation. However, as the inner rubber mounting is not conducive to improving mechanical strength, insulators with higher mechanical strength requirements should use combined mounting (i.e., the upper accessories use inner rubber mounting, and the lower accessories use outer rubber mounting).
Disc-type suspended porcelain insulators for high-voltage overhead transmission and distribution lines, used for insulation and fixation of conductors. Generally assembled into insulator strings for different voltage levels.
Standard insulators are suitable for general areas; increasing the number of insulator plates can also enhance the flashover performance if appropriate.
Suspended porcelain insulators are made by bonding porcelain pieces, iron caps, and steel feet with a cement of not less than 525 number silicate cement and quartz sand adhesive. The contact surfaces of the iron caps and steel feet with the adhesive are coated with a thin buffering layer, and the top of the steel feet features an elastic pad. The porcelain pieces are generally glazed with white and brown glaze, with other glazes available upon request. Both the iron caps and steel feet are fully hot-dip galvanized. The ball-type sliding elastic locking pins 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 groove-type connections, the former with a hot-dip galvanized surface, and the latter made of brass. The above elastic locking pins and cylindrical pins, etc., as non-insulating components, are divided into ball-type and groove-type according to the method of connection.
Standard and anti-fouling insulators of the same strength grade, with identical ball socket connection dimensions, can ensure interchangeability.
