MONITORING QUALITY OF ELECTRIC POWER AT DISTRIBUTION NETWORKS

<strong>ABSTRACT</strong><br> The paper reports quality analysis and evaluation at 0.4 kV low-voltage distribution grids in Uzbekistan. Power quality frequently does not correspond to the rated value which is largely due to unbalanced phase loading in grids and which also results in increased power loss. The study of the asymmetrical operating modes of the rural distribution networks of 0.4 kV was conducted in three steps: measurement, calculations and analysis of relevant data; providing practical guidelines and finally, implementing instruments to normalize grid operation. Measuring was conducted using certified instrumentation analyzer «Malika» designed by authors. The study and analysis of additional power losses as the function of indicators of asymmetrical features of voltage and current in operating 0.4kV grids revealed that, quality of electric power at grids under investigation merely does not meet the requirements of the Interstate Standard. <strong>REFERENCES</strong> Allayev of K.R. Electrical power sector of Uzbekistan and the world. – Tashkent: Moliya.-2010. – 256 pages. GOST 32144-2013 Normykachestvaelektricheskoienergii v sistemakhelektrosnabzheniyaobshchegonaznacheniya/ Mezhdos.sovetpostandartizasii, metrolog. I sertifik. – M.: Standartinform, 2014. -16 s. Bessonov L. A. Theory of electrical engineering - M.: Gardariki, 2007. - 685 pages. K.F. Wagner, R. D. Evans, the Method of symmetrical components applied to the analysis of asymmetric electrical chains with K.L. Fortescue's introduction. Translated from English by L.E. M. E. Syrkinykh, edited by D. A. Gorodsky. Publishing House “Power and energy literature”, Leningrad 1936 Moscow. - 48s. Kosoukhov, F. D., Naumov I.V. Calculation of voltage and capacity dropin rural distribution grids at current unbalance. –Irkutsk, 2003. -260 pgs. Kholiddinov I., Tuychiev Z., EralievKh. and Kholiddinova M.Influence Of Asymmetrical Modes On The Value Of Additional Power Losses In Low-Voltage Electrical Networks. Vol:54 Issue:10:2021 DOI 10.17605/OSF.IO/S Allayev K.R., KholiddinovI.Kh., Shaismatov S. A., Patent of the Republic of Uzbekistanfor useful model, No. FAP 01166 Analyzer for registration of additional losses of electric power at asymmetry of loadings in low-voltage electric grids//Agency on intellectual property of the Republic of Uzbekistan. The report on business contract No. 9/15 with JSC “Tashkentskoye TPES”, "Development of methods, software and hardware productsaimed at ensuring quality of electric power in 0,4 kV distributiongrids ", 2015. – 65 pages. Electric power quality management/ I. I. Kartashev, V. N. Tulsky, R. G. Shamonov, etc.; edited byYu. V. Sharov. - M.: MEI Publishing House, 2006. - 320 pages with illustrations.

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