Images Detection and Diagnosis of Corona Discharge on Porcelain Insulators at 22.9kV D/L

This study investigated detection of corona discharge on porcelain insulators at 22.9kV 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 (240~320nm) 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 applied with 65% of humidity, and it is required to apply them a lot more severely in the areas where more saturated humidity exists all the time. Namely, in case that the UV images detected from the areas with 65% of humidity are used as data and their neighboring environments change and more than 80% of humidity is saturated, it is very advisable to replace them in the Inspection step. This experiment and inspection would need to respect the above criteria. It was required to verify various experimental conditions and on-site inspection afterwards, but it was believed to minimize the measurement error by data-basing research results in a continuous manner and it was necessary to establish diagnosis technologies and standards in various electrical power facilities.