大氣環(huán)境下輸電線路導(dǎo)線腐蝕與防護(hù)的研究
[Abstract]:The transmission line is the foundation of the grid operation, and the overhead conductor is the main material of the power transmission line. The steel-cored aluminum stranded wire has the longest service time and the most widely used lead, and the main body position of the steel core is not changed for a long time in the future. The safe and reliable operation of the steel core aluminum strand is of great importance to the guarantee of power delivery. However, the service environment of the steel-cored aluminum strand is more complex, which is susceptible to various corrosion factors in the atmospheric environment, thus leading to the corrosion and fracture of the lead. In this paper, the LGJ240/30 steel-core aluminum strand used in the power transmission line is selected as the research object, and the corrosion of the steel-cored aluminum strand in 50 g/ L NaCl solution is studied by adopting the Tafel straight-line extrapolation method, the loss-of-mass method, the periodic dry/ wet-circulation salt spray simulation and the coastal environment. The results show that, under the condition of neutral NaCl, with the concentration of NaCl increased from 20 g/ L to 100 g/ L, the self-corrosion potential (open circuit voltage) of the aluminum wire is negatively offset, and the corrosion rate of the aluminum wire is fast; and the salt spray test results show that in the beginning of the corrosion During the period, a large amount of Cl-damaged the Al2O3 passivation film on the surface of the aluminum wire, so that the aluminum wire is exposed out of the aluminum base body, a primary battery is formed in the wet environment and the steel core zinc-plating layer, the corrosion of the galvanized layer is accelerated, and after the zinc layer is consumed, the aluminum and the steel core form a primary battery, and the corrosion speed of the aluminum is changed Fast, but with the increase of the corrosion products, the corrosion rate of the aluminum wire is gradually changed. It was found that the lead was seriously corroded in the course of service, and it was found that the lead was seriously corroded before the fracture, and the dirty object attached to the surface of the wire was analyzed, and the composition was found to be more complex, and it was composed of grease, air floating dust, acid corrosion products and the like. The main components of the mixture are CaSO42H2O, CaSO4, CaCO3, SiO2 and CaCl2.
【學(xué)位授予單位】:華北電力大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類(lèi)號(hào)】:TM75
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