Analysis Analysis and Suggestions on Device Clamp Screw Fracture of 110kV Transmission Line

Abstract

Fracture failure analysis on device clamp screws of one 110kV transmission line has been carried out based on results of macro-observation, pre-tightening test, mechanical property examination, chemical composition analysis, microstructure observation, SEM observation and EDAX analysis. It is concluded that the main reason of the screw fracture lies in misuse material and improper heat processing which led to material degradation. Suggestions are put forward finally.

Analysis Analysis and Suggestions on Device Clamp Screw Fracture of 110kV Transmission Line

“…Device clamp was a kind of connection fitting used to fix mother conductor and terminal outgoing. As one of power fittings, device clamp plays an important role in guaranteeing safe and stable operation of high and super high voltage transmission lines [1] [2]. Device clamp failure will cause severe electric network accidents and failure analysis is necessary and instructive to avoid similar events [3] [4] [5].…”