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This paper studies a measurement of ultra-violet (UV) emission of corona discharges on polymer insulators using an UV rays sensor including an optical lens. In addition, these data have been compared with the images of an UV rays camera. The detection of an UV rays signal begins at 60kV, which is about 37.5% of the breakdown voltage of the polymer insulator and the stronger the high voltage supplied...
This paper has investigated the possibility of glass insulator breakage by resonance and accelerated degradation based on an analysis of natural frequency characteristics of glass insulators on the KTX overhead line and behavioral characteristics of the overhead line on site. The natural frequencies were formed within the range of 10 kHz, and the largest amplitude was observed at 5.15 kHz. The largest...
This study investigated detection of corona discharge on porcelain insulators at 22.9 kV D/L. It carried out an experiment and an actual measurement about corona detection using a UV-camera. It was possible to detect an ultraviolet (240~320 nm) of corona discharge on porcelain insulators before the infrared generation due to joule's heat or visible ray. The step of the said inspection standards is...
In order to examine the causes of faulted cables under the operation of product liability(PL) law, it was necessary to database the patterns of faulted cables in materials for electric conductivity and insulation. Accurate analyses such as external and surface analysis were performed for the faulted cables and the over-current was given to copper wire used as a cable conductor for verifying the causes...
In this paper, we experimented the glowing and heating phenomenon at the contacts of copper wires, and studied the breeding process, the growing characteristics of copper oxide according to the diameter of copper wires and AC current. The surface structure, crystalline structure, compositions and calory variation of Cu2O that grew at the contacts of two copper wires were analyzed by using scanning...
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