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The paper is based on the investigative studies performed on the fiberglass crossarm which will be generally used in the distribution line structures as an additional insulation component. Lightning impulse voltage tests were conducted on the fiberglass crossarm alone to determine its critical flashover (CFO) voltage, and also the critical flashover voltage of 15 kV polymer suspension insulator plus...
The CFO voltage and V-t characteristic of 15 kV power distribution insulators are important factors in insulation coordination design of power distribution systems. Insulation designs for distribution feeders are usually based on 1.2/50 mus lightning impulse, while insulator behavior under steep front short duration (SFSD) pulses is not concerned. The generated SFSD impulse in this study has a 60...
The paper describes the influence of sequential flashover numbers on the flashover voltage as well as on the surface deterioration of the polymethylmethacrylate, tetrafluoroethylene and polyethylene insulators in vacuum. Observations of track formation have been made by an electron microscope to examine the shape of the treed-tracks during their growth. Attempts have been made to explain the mechanism...
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