There are usually a few ribs on the surface of the Suspension Clamp to improve the impact and power frequency flashover voltage, especially the edge near the upper attachment has a greater significance for increasing the impact flashover voltage. In order to reduce the thermal stress and adjust the height difference in the manufacture of the Suspension Clamp, the attachment and the Suspension Clamp are padded.
In order to make full use of the height of the insulation, the upper and lower metal fittings are filled into the upper and lower holes of the Suspension Clamp by means of glue, which is used to relax the thermal stress or act as a barrier. The superiority of the inner glue insulator is not only that the size, quality and metal material consumption of the insulator itself are much lower than that of the outer glue series. More importantly, the Suspension Clamp enables the electrical appliances and power distribution devices (such as the isolating switch and the complete power distribution). The size and quality of the device are reduced, and the space occupied by the power equipment is saved. But this structure also has some inherent disadvantages. Since the two ends of the accessories are glued into the Suspension Clamp hole, the mechanical strength of the Suspension Clamp is effectively degraded because the insulator has a relatively large diameter, and the insulator is easily damaged by thermal stress due to the internal glue. Suspension Clamp with high mechanical strength is not satisfactory. This structure is also not ideal, so the Suspension Clamp is currently only used in the 7.2-24kV class.
