Uncertainty Reproduction of the Three-phase Voltages System’s Asymmetry Analysis

Iurii Tesyk, Stanislava Pronzeleva, Roman Moroz

Abstract

Methods of reproduction of one-phase alternative voltage is widely known in measuring techniques. Developers apply the same methods to reproduce electric power quality indexes (EPQI) of three-phase networks, which consist of direct, reverse and zero symmetrical sequences. However these parameters depend not only on the amplitude of one vector of voltage of three-phase networks but on amplitudes of all of them and also on the phase angle between them, which is not taken into account by developers. It generates substantial disparity between the real uncertainty and uncertainty, caused only by inaccuracy of value of the amplitude of one vector of voltage of the network. On paper, the uncertainty of reproducing one of the parameters of quality of electric power was analysed in detail, taking into consideration its complex character. The result of comparing the uncertainty, which was calculated with consideration her complex character and without it, is given.

Keywords

electric power quality indexes, uncertainty, reproduction, network

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IMEKO-TC4-2017-102.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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