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

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 h...

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Main Authors:	Alessandro Mingotti, Lorenzo Peretto, Roberto Tinarelli
Format:	Article
Language:	English
Published:	MDPI AG 2020-03-01
Series:	Sensors
Subjects:	thd accuracy class instrument transformers sensors probability density function variance probability distribution
Online Access:	https://www.mdpi.com/1424-8220/20/6/1804

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spelling	doaj-7aaf33f0e8254b56aa83fe64ff1aba3f2020-11-25T00:44:43ZengMDPI AGSensors1424-82202020-03-01206180410.3390/s20061804s20061804A Closed-form Expression to Estimate the Uncertainty of THD Starting from the LPIT Accuracy ClassAlessandro Mingotti0Lorenzo Peretto1Roberto Tinarelli2Department of Electrical, Electronic and Information Engineering—Guglielmo Marconi Alma Mater Studiorum—University of Bologna, Viale del Risorgimento 2, 40136 Bologna, ItalyDepartment of Electrical, Electronic and Information Engineering—Guglielmo Marconi Alma Mater Studiorum—University of Bologna, Viale del Risorgimento 2, 40136 Bologna, ItalyDepartment of Electrical, Electronic and Information Engineering—Guglielmo Marconi Alma Mater Studiorum—University of Bologna, Viale del Risorgimento 2, 40136 Bologna, ItalyPower 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 25<sup>th</sup> (of 50 Hz), defined by the standards.https://www.mdpi.com/1424-8220/20/6/1804thdaccuracy classinstrument transformerssensorsprobability density functionvarianceprobability distribution
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Alessandro Mingotti Lorenzo Peretto Roberto Tinarelli
spellingShingle	Alessandro Mingotti Lorenzo Peretto Roberto Tinarelli A Closed-form Expression to Estimate the Uncertainty of THD Starting from the LPIT Accuracy Class Sensors thd accuracy class instrument transformers sensors probability density function variance probability distribution
author_facet	Alessandro Mingotti Lorenzo Peretto Roberto Tinarelli
author_sort	Alessandro Mingotti
title	A Closed-form Expression to Estimate the Uncertainty of THD Starting from the LPIT Accuracy Class
title_short	A Closed-form Expression to Estimate the Uncertainty of THD Starting from the LPIT Accuracy Class
title_full	A Closed-form Expression to Estimate the Uncertainty of THD Starting from the LPIT Accuracy Class
title_fullStr	A Closed-form Expression to Estimate the Uncertainty of THD Starting from the LPIT Accuracy Class
title_full_unstemmed	A Closed-form Expression to Estimate the Uncertainty of THD Starting from the LPIT Accuracy Class
title_sort	closed-form expression to estimate the uncertainty of thd starting from the lpit accuracy class
publisher	MDPI AG
series	Sensors
issn	1424-8220
publishDate	2020-03-01
description	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 25<sup>th</sup> (of 50 Hz), defined by the standards.
topic	thd accuracy class instrument transformers sensors probability density function variance probability distribution
url	https://www.mdpi.com/1424-8220/20/6/1804
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A Closed-form Expression to Estimate the Uncertainty of THD Starting from the LPIT Accuracy Class

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