Thought and Analysis of an Abnormal Fault for the Kinfe Switch of 220kV Substation Lines
This paper analyzes and discusses the abnormal accident of switch equipment in a 220kV substation.According to the clearance inspection and mechanical characteristics inspection of the line knife,combined with the field inspection,measurement and various test results,it was found that the root cause of the accident was that the B connecting rod was disconnected due to the rust and fracture of the snap spring,resulting in the actual unclosed phase B of the knife.This paper makes a rigorous analysis of the accident and puts forward a number of solutions and suggestions for this batch of knife crank arm,which improves the reliability of the equipment and meets the nor-mal operation of the power grid.
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