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In this paper, the failure of the switch operation caused by a screw breaking of adjustable mechanisms is analyzed. A number of tests, such as macroscopic examination, chemical composition analysis, metallographic test, scanning electron microscope analysis and hardness test, were carried out on the fracture screw sample. From the perspective of metal analysis, it is verified that the failure of the sample is due to the failure of material, resulting in corrosion fracture in the coastal industrial environment and tensile stress interaction. Put forward the checkpoint, do a good job in metal technical supervision, strengthen the quality acceptance and management of the equipment and its parts in the power grid, then, the chances of a similar accident can be reduced.

Failure Analysis on Phase B Adjustable Mechanisms of 220KV Lateral 2801 Switch in Da Yuan Substation