Recently, several UHV transmission lines that have been operational for over 15 years, transmitting power from Yunnan and Guizhou to Guangdong Province, suffered severe damage to their tower foot due to soil corrosion. Consequently, this study conducted accelerated corrosion simulation research on the UHV transmission tower foot in a laboratory setting. The electrolytic corrosion acceleration simulation method and the dry and wet cycle acceleration simulation method were proposed as two approaches to simulate tower foot corrosion in this study. The corrosion morphology and products resulting from electrolytic and natural corrosion of the carbon steel substrate exhibited remarkable similarities. Notably, the acceleration ratio of electrolytic corrosion exceeded 100, thereby adhering to the fundamental principles and evaluation characteristics of accelerated corrosion. The experimental design involved a simulation test that replicated the on-site environmental conditions, specifically targeting the dry and wet cycles. This test effectively mimicked the corrosion process of metal surfaces and generated rust layers exhibiting similar characteristics to those observed in field corrosion. By conducting an analysis of the polarization curve for the rusted sample, a comparison was made regarding the corrosion rates observed in different sections of the tower foot. The outcomes obtained from AC impedance analysis revealed that soil corrosion predominantly relied on diffusion processes, thereby enabling us to derive equivalent circuitry and component parameters pertaining to carbon steel soil corrosion.

The railway transport system is a key factor supporting industrialization in all aspects of human activity. However, in order not to lose its importance, it must meet the challenge of modern civilization. The safety, reliability, and efficiency of railway transport, to a large degree, depend on using highly integrated electronics, which are very sensitive to various disturbances generated in the electric traction system and train or coming from the environment. One of the sources of electromagnetic disturbances are high-voltage (HV) power lines running close to the railway infrastructure. The purpose was to assess the electromagnetic impact of overhead HV transmission lines on buried signaling cables of the railway traffic control system crossbreeding with them. The levels of voltage induced in the cable under steady state and the earth fault in the HV line at various soil resistivity were estimated. A software tool based on a hybrid numerical method that combines circuit theory and electromagnetic field theory was used for computations. It was found that very high voltages may be induced in the signaling cables during earth faults in the HV lines, which may lead to serious interference or damage to the equipment. The results provide useful knowledge for implementing modern railway traffic control systems and protection measures.