| Along with the west development strategy and the implementation of EHV transmission project started, big span, long-distance transmission lines will work on various environmental conditions. As the composite insulators are widely used for transmission lines, composite insulators in various environmental conditions of ageing and flash heal for regularly study is urgent. Silicone composite insulator has hydrophobic and detest water transference, the antioxidant pollution flashover ability, and has the population-particularly zero, auto cleaning, light weight, convenient transportation installation, and many other advantages. Since in the 1990s, the composite insulators in power system have been widely applied, the discovery of the transmission lines to prevent pollution flashover is an accident. At present, the grid running on existing is more than 300 million and the longest running is already nearly 20 years. Different manufacturer, different operation fixed number of year, different craft production of composite insulators and different environment in the operation reliability is a worrying problem. How to monitoring and evaluating the overall performance of composite insulators and how to correctly use composite insulator, is an urgent problem for the electric power operation department to solve. Therefore, it is quite necessary to research various operating performance of composite insulators, involving different environmental conditions and different operation fixed number of year of composite insulators electrical properties and material the physico-chemical properties, etc., in order to determine the composite insulator of ageing and reliable estimate its service life.This paper mainly study composite insulator aging situation investigation in DongGuan regions of different operation fixed number of year and carry out a number of experiment research work, the main content involves different operation fixed number of year of composite insulators hydrophobic and visible discharge and infrared spectrum of composite insulator aging research on the effects of three sections.From the following results of areas and different operation fixed number of year composite insulator aging research: the site operation of composite insulators Velcro, umbrella skirt color becomes white, pulverization and silver lines ageing phenomenon all appears at the same time, some insulator and umbrella skirt harden deformation phenomenon, had this type of aging characteristics of composite insulator and the environment of them is usually the coastal areas or damp foggy areas, umbrella skirt shades of composite insulator surfaces, the accumulation of accelerating ceremonially unclean composite insulators color changes, on-site composite insulator umbrella skirt damage phenomenon mainly for three damaged forms: jagged edge damage, local breakage and transverse rupture. Summarize umbrella skirt sheath material aging characteristics mainly displays are: umbrella skirt color from has bright color, mild suffused with white, to clear white. The surface roughness from luster, without luster, surface apparent silver grain, the last occurrence pulverization, Hardness from the beginning of flexibility, mild hard, to the final difficult to knead move umbrella skirt. Umbrella skirt in different stages also has its gradual characteristic, different aging stage of composite insulators in accordance with ageing phenomenon can be divided into mild, obviously, serious three ageing state.With different operation fixed number of year, different operation environment of composite insulators conduct heat and moisture air act, ultraviolet accelerated aging hair, corona accelerated aging law, wheel aging method and smoke aging test research, assessment method of composite insulators aging performance and electrical properties. Through to the composite insulator aging test, it is concluded that the study of the method of composite insulators aging influence factors of a series of research results of relevant results are summarized. Select run different years of composite insulators, separately according to umbrella skirt high-pressure terminal, the central and low-pressure end and monolithic umbrella inside and outside sampling the infrared spectrum quantitative analysis, results that umbrella skirt different parts aging degree uneven, near a mandrel sheath umbrella skirt surface aging serious, namely the closer sheath umbrella skirt aging the more serious. Although composite insulator each umbrella skirt operating conditions are the same, but due to external factors, discharging the diversity of the impact on the umbrella skirt or differences, which makes the composite insulator various umbrella skirt aging depth are different, but the umbrella skirt aging degree is basically kept consistent. From the macroscopic appearance characteristics of composite insulators painting running divided four aging level, respectively is no obvious aging, slight aging, obvious aging and serious aging. Different aging degree of silicone rubber umbrella skirt of Si-CH3 and Si functional group absorbing peak area and running time no obvious relationship. The way of infrared spectrum requires only a small amount of umbrella skirt material, basically won't break the insulator operation state, and has the advantages of sampling less.
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