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A Closed-form Expression to Estimate the Uncertainty of THD Starting from the LPIT Accuracy Class

Department of Electrical, Electronic and Information Engineering—Guglielmo Marconi Alma Mater Studiorum—University of Bologna, Viale del Risorgimento 2, 40136 Bologna, Italy
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Sensors 2020, 20(6), 1804; https://doi.org/10.3390/s20061804 (registering DOI)
Received: 3 March 2020 / Revised: 23 March 2020 / Accepted: 23 March 2020 / Published: 24 March 2020
(This article belongs to the Section Electronic Sensors)
Power quality is a wide-ranging and current topic that involves a huge effort from the scientific community. Power quality issues have to be avoided or solved in order to preserve the integrity of the network and its assets. To this purpose, several power quality indexes and measurement techniques have been developed and used by experts. This paper aims at solving the issue of having an uncertainty associated to the total harmonic distortion (THD) measurements. The idea is to obtain a close-form expression, which only requires the knowledge of the instrument transformer accuracy class, to estimate the mean value and the variance of THD. After the development of such an expression, it has been tested and stressed to confirm its effectiveness and applicability in a variety of conditions, and for harmonics up to 25th (of 50 Hz), defined by the standards. View Full-Text
Keywords: THD; accuracy class; instrument transformers; sensors; probability density function; variance; probability distribution THD; accuracy class; instrument transformers; sensors; probability density function; variance; probability distribution
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Mingotti, A.; Peretto, L.; Tinarelli, R. A Closed-form Expression to Estimate the Uncertainty of THD Starting from the LPIT Accuracy Class. Sensors 2020, 20, 1804.

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