Problems derived from the simultaneous utilisation of different flickermeters in large electric networks

Abstract

Power Quality assessment in distribution networks requires distributed measurements in order to verify the PQ state of the art. This process cannot simply be considered as an extension of a measurement at a given point because several variables need to be considered: number of PQM; election of optimal measurement location; synchronisation of instrumentation and management of captured data. This work focuses on the problems related with the simultaneous utilisation of different flickermeters in large electric networks. From a classical instrumentation point of view, several flickermeters from different customers are tested in the laboratory in order to determine the differences in the accuracy of the results. Both Pst and Plt are statistical parameters calculated using a large number of samples of the instantaneous flicker level IFL . The number of captured samples can vary from one instrument to another, so different flickermeters provide different values.