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Zbornik radova, Elektrotehnički institut "Nikola Tesla"
2017, vol. 27, iss. 27, pp. 11-19
article language: Serbian
document type: Professional Paper
published on: 21/12/2017
doi: 10.5937/zeint27-15388
Creative Commons License 4.0
Review of the problems related to failure of metal resistor in power transformer neutral
University of Belgrade, Electrical Engineering Institute 'Nikola Tesla'



Energy efficiency Improvement of Hydro and Thermal power plants in EPS by development and implementation of power electronics based regulation and automation equipment (MESTD - 33020)


In case of a neutral-grounding resistor failure, the low impedance grounded network become ungrounded. This can lead to a very high level of transient overvoltages due to intermittent arcing faults. Also, in the dominant cable networks, there is a possibility of earth fault current extinction. In this way, places with weakened insulation, which may be the cause of multiple failures, are created in the network. Accordingly, the paper points out the necessity and affirmation of existing solutions for continuous monitoring of neutral grounding resistors, also proposing a universal technical solution.


medium voltage network; metal resistor; grounding; integrity monitoring; ground fault protection


*** (2015) Metodologija za uzemljavanje neutralne tačke srednjenaponske mreže. Beograd: Elektrotehnički institut Nikola Tesla, Studija, naručilac JP Elektroprivreda Srbije, obrađivač, decembar
*** (1998) Tehnička preporuka br. 6 ED Srbije - uzemljenje neutralnih tačaka u elektodistributivnim mrežama 110 kV, 35 kV, 20 kV, 10 kV I 0.4 kV. IV izdanje, decembar
*** (1993) Tehničko uputstvo o tretmanu neutralne tačke 35 kV u TS 110/35 kV Elektroistok-a za vreme radova na impedansi za uzemljenje. EPS-Beograd, TU-EX-02, Februar
Al-Hajri, M.T. (2004) Neutral ground resistor monitoring schemes. in: Conference Record of the 2004 IEEE International Symposium on Electrical Insulation, Institute of Electrical and Electronics Engineers (IEEE), str. 388-393
Kostić, V. (2017) Pregled problema vezanih za uticaj geomagnetski indukovane struje. Tehnika, vol. 72, br. 2, str. 243-247
Labos, W., Mannarino, A., Drobnjak, G., Ihara, S., Skliutas, J. (2005) A possible mechanism for neutral grounding resistor failures. in: IEEE Power Engineering Society General Meeting, pp. 1149-1154 Vol. 2
Paulson, G.E. (1999) Monitoring neutral-grounding resistors. in: Conference Record of 1999 Annual Pulp and Paper Industry Technical Conference (Cat. No.99CH36338), Institute of Electrical and Electronics Engineers (IEEE), str. 238-241
Selkirk, D., Savostianik, M., Crawford, K. (2010) The Dangers of Grounding Resistor Failure. IEEE Industry Applications Magazine, 16(5): 53-58
Selkirk, D., Savostianik, M., Crawford, K. (2008) Why neutral-grounding resistors need continuous monitoring. in: 55th IEEE Petroleum and Chemical Industry Technical Conference, Institute of Electrical and Electronics Engineers (IEEE), str. 1-7
Simić, N., Mrvić, J. (2011) Kvar metalnog otpornika za uzemljenje neutralne tačke mreže 35 kV. Zbornik radova, Elektrotehnički institut 'Nikola Tesla', br. 21, str. 241-246
Toroš, Z., Kastelic, T., Maljavac, S., Kastelic, P. (2013) Neutral grounding resistor failure detection verification. in: 22nd International Conference and Exhibition on Electricity Distribution (CIRED), Stockholm, pp. 1-3