Analysis of Fracture of Operating Ceramic Insulators During the Process of Opening Together
This article introduces a case of a broken ceramic insulator operated by a scissor type isolation switch in a 500 kV substation.Through technical means such as macroscopic inspection,size measurement,and porosity testing,it was found that the porosity test of the broken ceramic insulator was unqualified,and the connecting rod arm under the rotating flange plate acted as a traction force during the opening and closing actions,showing a high and low distribution.In response to this issue,the promoting effect of manufacturing defects in ceramic insulators and flange tilting on fracture faults was analyzed.The results indicate that the pulling force and torque act on the weakest position of the porcelain insulator,combined with manufacturing defects,ultimately leading to the occurrence of fracture failure.
scissor type isolation switchmanufacturing defectsuneven force distributioninsulator fracture
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