Ceramic Cross Arm Insulators S-280, S-280Z, SC-280

Insulators are composed of ceramic components and upper and lower metal attachments bonded together with adhesive. The ceramic component ends are in contact with the metal attachments via elastic pads, and the bonding areas of the ceramic components feature structures such as sandblasting, knurling, and grooving for mechanical strength, anti-loosening, and anti-twisting. The ceramic surfaces are uniformly glazed white, and the metal attachments are coated with gray magnetic paint. The main structure of the ceramic insulator components comes in two types: a hollow partition (penetrable) structure and a solid (non-penetrable) structure. The bonded pillar insulators are generally of the solid non-penetrable type, which reduces maintenance and testing work compared to the previous type. The ceramic insulator components have either multi-angled or less-angled shapes, with the multi-angled shape increasing the surface distance and having better electrical performance than the less-angled shape. All products except for the external bonded pillar insulators that are being phased out are multi-angled. The internal bonding structure, where the metal attachments are glued into the ceramic holes, increases the insulation distance and improves electrical performance, while also reducing the space required for installation. However, due to the negative impact on mechanical strength, insulators with higher mechanical strength requirements should use a combined bonding method (i.e., the upper attachments are internally bonded, and the lower attachments are externally bonded).