Analysis on Corrosion Fracture of Guyed Rod of Cable Stayed Iron Tower in 110 kV Transmission Line

The guyed rod is of great importance for supporting tower and resisting wind pressure, and its reliability is an effective guarantee for safe and stable operation of power grid. In this paper, the fractured guyed rod used for cable stayed iron tower in a 110kV transmission line was investigated by means of macro-morphology inspection, chemical composition analysis, microstructure analysis, scanning electron microscope, mechanical properties test, soil physicochemical properties inspection and energy spectrum analysis. The result showed that electrode potentials difference existed between different parts on the surface of the guyed rod caused by the uneven distribution of oxygen concentration was the major reason for electrochemical corrosion. Under the action of oxygen concentration cell, the effective cross-sectional area of the guyed rod decreased below the critical value, leading to the final fracture of the guyed rod.