Abstract
The U-shaped hanging ring was fractured in B phase fault tripping of a 220kV transmission line. They are analyzed by using macroscopic inspection of fracture, hardness test, chemical composition analysis, fittings load calculation, metallographic structure analysis and scanning electron microscopy analysis. The results show that there is a current flowing through the ground wire when the high-speed rail passes through. Poor contact between the U-shaped hanging ring and the clamp steel anchor caused heating and then high temperature wear. Long-term operation eventually led to fracture.
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