Investigation of the Overvoltages in Electrical Power Lines with a Grounded through a Resistance Neutral
The paper examines the variation of electrical variables during phase-to-ground faults on medium voltage electrical power lines with a grounded through a resistance neutral. The studies were performed with simulation models of a medium voltage electrical power line. The parameters under consideration have been the voltages and the currents in the transient and steady state operation of the line and more precisely their dependence on the variation of the arc resistance in the place of the fault and the distance from the fault to the supply source. Calculated, accordingly, is the overvoltage during the transient process, the maximum magnitude of the overvoltage and phase-to-earth fault current, the duration of the transient phase-to-ground fault current as well as the maximum magnitude of the overvoltage оn the neutral.
Etarski, S.I. (1994). Electrical part of power plants. Sofia, Technology.
Shabad, M. A. (2002). Protection against single-phase short circuits to earth in 6-35 kV net-works. Sank Petersburg.
Feldman, M. L. (2001). On the issue of neutral grounding methods. International Scientific and Technical Conference, Issue 1, St. Petersburg, p. 66-68.
Shalin, A. (2005). Earth faults in power lines 6-35 kV. Features of occurrence and protection devices. - Electrical Engineering News, 1 (31).
Karafeizov, Ts., Grchki, N., Spendzarov, B. (2003). Grounding the star center of a medium voltage system through water resistance. - Energy Forum 2003, Varna, 175-177.
Mehmed-Hamza, M., Vasileva, M., Filipov, A., Yordanova, Y. (2007). Some considerations for the choice of the work regime of the neutral of the power transformer of the electrical power networks medium voltage. IV International Scientific Symposium ELEKTROENERGETIKA 2007, Stara Lesna, Slovak Republic, 167-169
Mehmed-Hamza, M., Vasileva, M., Yordanova, Y. (2009) Coordination of the operation of the relay protection and surge protective devices in electrical power networks medium volt-age 20 kV J. Electr. Eng., 60 (3), 170-172.
Ministry of Energy. (2015). Ordinance № 3 Regarding the construction of electrical switchyards, switch-gears and power lines. Retrieved from http://www.gli.government.bg/page.php?c=34&page=8. (in Bulgarian)
Ministry of Energy. (2015). Ordinance № 16-116 for the technical operation of energy equipment. Retrieved from http://www.gli.government.bg/page.php?c=34&page=8. (in Bulgarian)
Mehmed-Hamza, M., Vasileva, M. (2009). "Using of Matlab Simulink for Education in higt voltage technics and relay protection". ICEST 2009, Veliko Tarnovo, ICEST 2009, 481-482.
БДС EN IEC 60071:2019 Insulation coordination - Part 1: Definitions, principles and rules
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