DOI: 10.18503/1995-2732-2022-20-3-147-154
Abstract
Relevance and Objectives. It is important to determine how consumers actually affect the quality of electric power in order to decide where equipment should be installed for power quality optimization, as well as the parameters of such equipment. To determine the most appropriate place for installing higher harmonic filters, an experimental study was carried out to understand the mutual effect of a 220 kV power grid and electric arc furnaces of a steel plant on the electric power quality at one of the step-down stations and on its 35 kV buses. Methods Applied. The experiment relied on Resurs UF2M and Energotester ПКЭ-А meters that registered phase currents, voltages and powers, as well as low and high voltage harmonic factors at the transformer ТДЦНМ-100000/160000/220-У. Findings. The results of the study helped analyze how much the supply mains and the plant consumers contributed to the voltage non-sinusoidality. They also helped restore the equivalent circuit of the considered system for k harmonic. The authors reason why it is crucial to conduct studies on power quality within a wide range of loads before deciding on the installation of optimization equipment. It is showed that in the considered case the higher harmonic filters installed on the 35 kV buses failed to deliver the required optimization of the 220 kV bus power quality. Practical Relevance. The conclusion drawn contradicts Item 3.2.17 of the Code for Consumer Electrical Installations that stipulates that filter compensating devices must be used and that electric arc furnaces cannot be operated without them. The paper discusses why the above discrepancy occurred and the fact that it would be necessary to review the applicable regulations in order to optimize the utilization of resources.
Keywords
electric power quality, voltage non-sinusoidality, high-voltage grids, electric arc furnaces, filter compensating devices
For citation
Dziuba M.A., Safonov V.I. Contribution of a Supply Network and an Industrial Site to the Electric Power Quality at the Point of Delivery. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2022, vol. 20, no. 3, pp. 147-154. https://doi.org/10.18503/1995-2732-2022-20-3-147-154
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