Analysis of the reasons behind the fracture of the 220kV pipe busbar horizontal line clamp

The reasons behind the fracture of the 220kV pipe busbar horizontal line clamp were analyzed. The fracture morphology, composition of chemical elements, metallographic examination and SEM of the fractured clamp were investigated by ICP-AES, SEM and metallurgical microscope. The test results show that many casting defects are found and that this batch of horizontal line clamp is substandard product. The horizontal line clamp structure design is unreasonable, which leads to the stress concentration in the location of the fracture. The corresponding suggestions are proposed.