VPLIV NEURAVNOTEŽENEGA TOKA V ELEKTRIČNIH ZBIRALKAH NA PORAZDELITEV MAGNETNEGA POLJA
Povzetek
V prispevku je predstavljena analiza porazdelitve magnetnega polja in gostote toka v primeru trifaznega zbiralnega sistema s tokom 500 A. Raziskuje se vpliv položaja nevtralnega vodnika na magnetno polje in porazdelitev gostote toka. Glavni cilj izračunov je bil najti položaj nevtralnega vodnika, ki proizvaja najmanjše magnetno polje in gostoto toka v primeru tokovne neuravnoteženosti. Numerični izračuni so bili izvedeni v programskem paketu COMSOL Multiphysics na poenostavljenem 2D-modelu. Rezultati izračuna so predstavljeni grafično kot diagrami porazdelitve magnitude magnetnega pretoka in gostote toka v ravnini trifaznega sistema zbiralk, pravokotni na os sistema. Dobljeni rezultati kažejo, da v obeh primerih (tokovno ravnotežje in tokovno neuravnoteženost) položaj nevtralnega vodnika vpliva na porazdelitev gostote magnetnega pretoka.
Prenosi
Literatura
Bio Initiative report: A rationale for a biologically based public exposure standard for electromagnetic fields (ELF and RF), 2012. http://www.bioinitiative.org
National Research Council (US) Committee on the Possible Effects of Electromagnetic Fields on Biologic Systems, Washington (DC): National Academies Press (US); 1997
ICNIRP: Guidelines for limiting exposure to time‐varying electric and magnetic fields (1 Hz – 100 kHz), Health Physics, Vol. 99, Iss. 6, p.p. 818-836, 2010
Pravilnik o granicama izlaganja nejonizujućim zračenjima, “Službeni glasnik RS“, broj 104, 2009.
D. W. Deno: Transmission line fields, IEEE Trans. Power App. Syst., Vol. PAS-95, no. 5, p.p. 1600-1611, 1976
R. G. Olsen, P. S. Wong: Characteristics of Low Frequen-cy Electric and Magnetic Fields in the Vicinity of Electric Power Lines, IEEE Trans. Power Del., vol. 7, p.p. 2046-53, 1992
IEC std 62110:2009 – Electric and magnetic field levels generated by AC power systems – Measurement proce-dures with regard to public exposure, 2009
J. Driesen, T. Van Craenenbroeck: Power Quality Application Guide: Voltage Disturbances - Intro-duction to Unbalance, Copper Development Association, IEE Endorsed Provide, May 2002
M. Adibi, P. Milanicz, T. Volkmann: Asymmetry issues in power system restoration, IEEE Trans. Power Systems, vol. 14, no. 3, p.p. 1085–91, 1997.
A. Kalyuzhny, G. Kushnir: Analysis of current unbalance in transmission systems with short lines, IEEE Trans. Power Del., vol. 22, no. 2, p.p. 1040-48, 2007
H. Arghavani, M. Peyravi: Unbalanced current-based tariff, CIRED, Session 2, p.p. 883-887, 2017
K. Ma, L. Fang, W. Kong: Review of Distribution Net-work Phase Unbalance: Scale, Causes, Consequences, Solutions, and Future Research Directions, CSEE Journal of Power and Energy Systems, Vol. 6, No. 3, pp. 479-488, 2020
M. Milutinov, A. Juhas, N. Pekaric-Nadj: Analysis of Effects of Current Unbalance on Magnetic Field, 17th International Symposium on Power Electronics - EE 2013, Novi Sad, Serbia, 2013
D. Antić, M. Milutinov, A. Juhas, Power line magnetic field deviations for three different current unbalance defi-nitions, 14th International Conference on Applied Electromagnetics - ПЕС, Niš, Serbia, pp. 1-4, 2019
K. Kasas, G. Mijatovic, D. Herceg and M. Prsa: Electromagnetic field distribution in vicinity of unbalanced mixed overhead power lines, 14th International Conference on Applied Electromagnetics, ПЕС 2019, Niš, Serbia, p.p. 1-4, 2019
M. Milutinov, A. Juhas, N. Pekaric-Nadj: Magnetic field in vicinity of busbars with unbalanced currents, 8th International PhD Seminar on Computational Electro-magnetics and Electromagnetic Compatibility – CEMEMC, Timisoara, Romania, 2014
M. Milutinov, A. Juhas, N. Pekarić-Nadj: A study on exposure to magnetic field generated by unbalanced currents, Trans. on mathematics & Physics, Scientific Bulletin of Polytehnica University of Timisoara, vol. 60(74), no.1, p.p. 59-69, 2015
M. Milutinov, A. Juhas, N. Pekarić-Nadj: Relative deviation of magnetic flux density as a function of current unbalance, 9th International PhD Seminar on Computational Electromagnetics and Bioeffects of Electromagnetic Fields, CEMBEF, Niš, Serbia, 2015
D. Antić, A. Juhas, M. Milutinov: Power line magnetic field deviations for three different definitions of current unbalance, Journal of Energy Technology – JET, Vol 12, Iss 4, p.p. 61-70, 2019
Web page link: https://www.eaeelectric.com/catalogs/busbar-systems/e-line-kx-busbar.pdf, last visited July 2023
