Analysis of a Ratio between Delta V10 and Pst Flicker Criteria

Nowadays the short-term flicker severity value Pst and the long-term flicker severity value Plt are the common-used quantities for the characterization of flicker level in an electrical network in the majority countries in the world. But in some areas of Far East (Japan, Taiwan) power companies use other criterion for the assessment of voltage fluctuation - the voltage flicker index Delta V10 which characterizes the actual flicker with respect to an equivalent value of the voltage modulation component with the frequency of 10 Hz. There are a lot of attempts to find a simple and reliable approach for the converting from one index to other by multiplying the index with a factor, but no universal method was developed. In the paper is shown that the ratio between both flicker assessment criteria is dependent on signal parameters.