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Estimation of the degree of aging and the remaining lifetime of composite insulators is an important issue. In this paper, one shed of a 500 kV AC composite insulator that has operated for three years on a transmission line was studied. The insulator shed was cut longitudinally into four layers from the upper surface to the bottom surface and tested by the thermally stimulated current (TSC) method,...
As composite insulators have been widely used in power system, the aging of composite insulator has become a threat to safe operation of transmission line. In order to investigate the influence of several aging factors on the sheds of high temperature vulcanized silicone rubber composite insulator, nine pieces of energized sheds on the high voltage end serviced on 500kV transmission lines have been...
The aging problem of material of composite insulators is one of key issues for power utilities. The most commonly used methods for aging evaluation are observation method, HC water spray classification method and static contact angle method and so on. However, there some subjective factor would be introduced by the operator of those methods. In order to investigate the aging state more objective,...
With the wide use of room-temperature-vulcanized silicone rubber coating (RTV coating) in the power system, the aging problem of the RTV coatings is being drawn increasing attention. Most of the existing aging assessment methodologies do analysis from a macro-structure, but the aging is rarely evaluated from the perspective of micro-electrical characteristics. The thermally stimulated current (TSC)...
With an increase in usage amount and operating years of composite insulators, their failures caused by aging increased in number. The 110kV composite insulators in service were studied in this paper, and the electric field distribution along the axial direction of the insulator was calculated by using ANSYS software, which is based on the finite element method (FEM). According to the simulated results,...
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