Severity Level of An Insulator in Polluted and Dry Conditions Based on Ultraviolet Emission

In this study, the ultraviolet (UV) emitted by partial discharge which occurred on the insulator in polluted and dry conditions was investigated. The UV image and intensity were recorded for 1 minute per voltage variation per pollutant weight variation. The voltage stress was varied until the flashover occurred. The results showed that there was no consistent relationship between pollutant weight and those two UV emission parameters. In addition, the UV intensity consisted of maximum, minimum, and average values because it fluctuated during the recording. There were two UV image patterns that could be identified, namely the scattered points and the concentrated light (forming an area). The greatest the UV intensity, the highest deviation between the maximum and minimum values, and the largest concentrated light pattern were found during a critical condition.