The use of diagnostics data for condition indexing of HV components

Depending on the diagnostic tool used, the results of the measurements are different diagnostic parameters, e.g. partial discharge (PD) inception voltage, PD magnitudes at different voltages, tangents delta, return voltages, etc. It is also known that aging, degradation, and failure mechanisms are statistical in nature. Moreover, to estimate the time to failure correct statistical interpretations is needed. As a result, due to statistical behavior of these mechanisms diagnostic results need statistical features. As the amount of usable data is increasing with number of measurements conducted, this opens up the opportunity to statistically analyze this data.