Mitigation of Insulator Ultraviolet Emission Measurement Errors Using Facular Area

The use of an ultraviolet (UV) imaging camera is very useful in evaluating insulator conditions since it can detect pre-breakdown phenomena and inform their location. However, the accuracy of UV count measurement, as a quantitative indicator that can be read directly on the camera screen, is greatly influenced by how the operator conducts the data recording on the observed insulator. This paper reported the presence of human error in UV count measurement. Furthermore, the facular area was applied to be compared with the UV count. The discharge phenomena were generated through various experiments. The results showed that the application of facular area was able to evaluate the insulator condition more accurately if it was compared to the UV count when the data recording was conducted incorrectly. In this case, there was no doubt when the quantitative results were related to the qualitative results.