Abstract
This paper deals with experimental validation of a Virtual Instrument used for power quality monitoring. The Virtual Instrument is developed in the graphical programming language LabVIEW developed by National Instruments and uses specialized signal conditioning circuits and data acquisition card to perform the measurements. LabVIEW greatly enhances the power quality monitoring capabilities because of the short development time, easy creation of a user interface, high sampling rates. All of these factors makes virtual instrumentations more acceptable than classic power quality monitoring instruments. The main goal of this paper is to compare the developed virtual instrument with a power quality analyzer, Fluke 435. Also the uncertainty budgets for DC and AC voltages are evaluated for the virtual instrument. As a referent unit in the uncertainty budget evaluation the calibration Fluke 5500 A is used. From the obtained result the Virtual Instrument showed great capabilities for power quality monitoring
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