Four types of composite insulators made with the two most commonly used end fitting designs have been subjected to dynamic mechanical loads. It was found that a combination of dynamic flexion and static tension loads were more severe on the insulators than pulsed tension loads which in turn were more severe than static tension loads. The design of the end fitting has a significant influence on the response of the insulator to dynamic loads. The results also indicate that it may be more relevant for a user to select composite insulators on the basis of their performance under dynamic loads than under static tension loads.K e v w o r d s -composite insulators, nonceramic insulators, mechanical endurance, vibrations, transmission lines. 1-INTRODUCTIOhlUtilities in North America have adopted composite insulators to such an extend that they now represent about 20 % of the transmission line insulator market 1' 1. The majority of these users are satisfied with the performance of these insulators. Some failures have occurred in service, which in many cases can be attributed to the degradation of the weathershed protecting the FRP rod. This degradation is often caused by the combined effects of the environment and the electric stress. Very few mechanical failures have occurred, mainly because these insulators operate, for most of the time, at loads that are only a fraction of their average failing loads. It is nevertheless important to know in detail the insulator's mechanical characteristics in order to use them in the most efficient way.The mechanical strength of composite insulators depends on the length of time they are subjected to the load. Their time versus static tension load characteristics have been measured and reportedThe results show that well designed insulators perform very well under this type of load. Their performance is less impressive when they are subjected to cyclic tension loads 131. This paper presents the results of a study in which four types of composite insulators have been subjected to either pulsed tension loads or a combination of static tension and cyclic bending loads. Figure 1 shows the four types of composite insulators that have been tested. They are constructed with the two end fitting designs most commonly used today. The cavity inside the metal fitting of insulator types A and D1 constitutes the housing of an SM 769-1 PWRD by the IEEE Transmission and Distribution Committee of the IEEE Power Engineering Society for presentation at A paper recommended and approvedinverted cone that is fastened to the end of the FRP rod. This locks the rod in place. The end fitting of insulator types B and D2 consists of a metallic cylinder that is crimped onto the FRP rod. These two end fitting designs have been described in detail elsewhere [41. All the insulators are made with epoxy resin impregnated fiberglass rods. Insulator type D1 is identical to insulator type D2 except for the end fittings which are of the cone type for D1 and the compression type for D2. The FRP rod of insulator type A has a ...
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