Modeling transients in MV resonantly grounded industrial grid during single line to ground faults

• Autorzy: Warecki Jurij , Gajdzica Michał

Identyfikatory

DOI

10.21008/j.1897-0737.2019.98.0006

• Konferencja: Computer Applications in Electrical Engineering (15-16.04.2019 ; Poznań, Polska)
• Języki publikacji: EN

Abstrakty

EN

Medium voltage distribution power grids mostly operate with ungrounded neutral points of transformer. The philosophy about these power supply systems based on the assumption that the electrical grid is more reliable. However the practice of operation showed that currents of single phase or multiple faults to ground depend mostly on the earth capacitances of cables connected to power grid and configuration and structure in relation to the main substation buses. Moreover, this kind of arcing ground faults on the ungrounded system causes transient overvoltages several times than nominal value. In the consequence, it may be dangerous for the electrical devices connected to the power system. The article focuses on the transient impact the equipment insulation due to faults in the middle voltage industrial grid with adjustable speed drives. The examination results of transient voltages across the system was presented. The Matlab/ Simulink Software was used to modeling system behavior during intermittent faults.

Słowa kluczowe

EN

electrical grid; grounding methods; transients overvoltage; transient intermittent faults

• Wydawca: Wydawnictwo Politechniki Poznańskiej
• Czasopismo: Poznan University of Technology Academic Journals. Electrical Engineering
• Rocznik: 2019
• Tom: No. 98
• Strony: 65--75
• Opis fizyczny: Bibliogr. 7 poz., rys., tab.

Twórcy

autor

Warecki Jurij

• AGH University of Science and Technology

autor

Gajdzica Michał

• TAMEH Polska Sp. z o. o.

Bibliografia

• [1] Hou D., Comparing Fault Resistance Coverage of Different Distribution System Grounding Methods, 37th Annual Western Protective Relay Conference, October 2010.
• [2] Agrawal K.C., Electrical Power Engineering Reference & Applications Handbook, Chapter 20. Temporary over-voltages and system grounding, 2007, pp. 759–772.
• [3] Varetsky Y., Seheda M., Taran I., Modeling transient in compensated electrical grids during line faults, Modern Electric Power Systems 2015, July 2015.
• [4] Ravlić S., Marušić A., Simulation Models for Various Neutral Earthing Methods in Medium Voltage Systems, 25th DAAAM ,,International Symposium on Intelligent Manufacturing and Automation”, DAAAM 2014, Procedia Engineering 100 (2015), pp. 1182–1191.
• [5] Feng S., Zheng L., Lie J., Sun Y., Chen G., Ji X., Research on Arc-grounding Overvoltage in the 10kV Distribution System, 2012 ,,International Conference on Future Energy, Environment, and Materials”, Energy Procedia 16 (2012), pp. 1785–1791.
• [6] Beliakov N.N., Studying voltages during arcing line to ground faults in 6-10 kV networks, Electrichestvo, 1957, No. 5, pp. 31–36 (in Russian).
• [7] Varetsky Y., Bachor Z., Ravlyk A., Transients in 10-35 kV electric networks with ungrounded neutrals under earth faults, Proc. of VII Int. Symp. „Short Circuit Currents in Power Systems”, Warsaw, 1996, pp. 1.20.1–1.20.4.

Uwagi

Badania były finansowane z subwencji badawczej nr 16.16.210.476

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę.