Detailed Description
Insulators are made by bonding ceramic components with upper and lower metal fittings using adhesive. Elastic pads are placed between the ceramic component's end face and the adhesive contact area of the metal fittings. The ceramic bonding sections feature structures such as sandblasting, knurling, and grooving to ensure mechanical strength, prevent loosening, and twisting. The ceramic surface is evenly coated with white glaze, and the metal fittings are coated with gray magnetic paint.
The insulator porcelain component has two main structures: a hollow partition (penetrable) structure and a solid (non-penetrable) structure. The composite pillar insulators are generally of the solid non-penetrable structure. The latter structure improves safety and reliability compared to the former, and reduces maintenance and testing workload.
The insulator porcelain pieces come in two shapes: with either more or fewer棱. The ones with more棱 increase the surface distance, offering better electrical properties compared to those with fewer棱. All products except for the gradually being phased-out vulcanized rubber-insulated pole insulators are of the multi-棱 shape.
Internal rubber-mounted structure, due to metal accessories being glued into the porcelain component holes, it correspondingly increases the insulation distance, enhancing electrical performance. At the same time, it reduces the space occupied during installation. However, since internal rubber mounting is not conducive to increasing mechanical strength, insulators with higher mechanical strength requirements are best used with combined mounting (i.e., upper accessories with internal rubber mounting, lower accessories with external rubber mounting).
The disk-type suspension 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 segments can also enhance their anti-fouling performance.
Suspended porcelain insulators are assembled with porcelain components, iron caps, and steel feet, bonded with cement not lower than No. 525 silicate cement and quartz sand adhesive. The iron caps and steel feet have a thin layer of buffering material on the contact surfaces with the adhesive, and the top of the steel feet features an elastic pad. The porcelain surface is usually glazed with white and brown glazes, or other glazes as required. Both the iron caps and steel feet are fully hot-dip galvanized. The push-pull elastic locking pins with 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 are easy to assemble and disassemble. The cylindrical and camelback-shaped open销 with slot connections, the former being hot-dip galvanized on the surface, and the latter made of brass. The elastic locking pins and cylinder pins, etc., as zero insulators, are divided into spherical and slot types based on the connection method.
Standard and dirt-resistant insulators of the same strength grade, with identical ball socket connection dimensions, are interchangeable.
