Phenomena leading to asymmetry of phase–to–earth voltages in MV networks

• Autorzy: Lorenc J. , Staszak B.

Identyfikatory

DOI

10.21008/j.1508-4248.2016.0014

• Języki publikacji: EN

Abstrakty

EN

When analysing the earth–fault phenomena, the longitudinal impedance of individual elements is neglected, and the capacitances and conductivities of individual phases to ground are only taken into account. Such a procedure is well–founded for resonant earthed networks and the faults accompanied by a significant resistance at the disturbance’s location (called high–resistance faults). However, in such a case, the possibility of occurrence of voltage differences between the network neutral point and the earth should be considered. The voltage is the effect of natural asymmetry in the network’s phase admittances or in the supply voltages. Level of such a voltage asymmetry significantly affects the flawless of the earth–fault protections and the accurate tuning of Petersen coils in the earth–fault compensation process. In the paper, the results of research work on how different phenomena affect the level of the network phase voltage asymmetry are presented. The investigations have been carried out on the PSCAD software–based MV network model, and investigations take into account the relations between asymmetries in the phase capacitance and conductance of the network as well as the load asymmetry degree in the individual power lines.

Słowa kluczowe

EN

earth faults; MV network; voltage asymmetry; earth fault protection

• Wydawca: Wydawnictwo Politechniki Poznańskiej
• Czasopismo: Computer Applications in Electrical Engineering
• Rocznik: 2016
• Tom: Vol. 14
• Strony: 158--167
• Opis fizyczny: Bibliogr. 4 poz., rys., tab.

Twórcy

autor

Lorenc J.

• Poznan University of Technology

autor

Staszak B.

• Poznan University of Technology

Bibliografia

• [1] Lorenc J., Admitancyjne zabezpieczenia ziemnozwarciowe, Wydawnictwo Politechniki Poznańskiej, Poznań 2007 (in Polish).
• [2] Synal B., Zjawiska ziemnozwarciowe w sieciach z małym prądem zwarcia doziemnego, Problematyka zabezpieczeniowa, Prace Instytutu Energoelektryki Politechniki Wrocławskiej, Monografia, Wrocław 1974 (in Polish).
• [3] Winkler W., Wiszniewski A., Automatyka zabezpieczeniowa w systemach elektroenergetycznych, WNT, Warszawa 2004 (in Polish).
• [4] Żydanowicz J., Elektroenergetyczna Automatyka Zabezpieczeniowa, tom 2, WNT, Warszawa 1985 (in Polish).

Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).