Has been analyzed possible methods of earthing of neutrals in 35 kV power grid. Among the most common injuries in these electrical system are arc circuits, that is why the dependence of overvoltage multiplicities on the nature of earth arcing and on the method of earth arrangement of electrical system neutral. Given that in 35 kV power grids may arise ferroresonant processes, operation of voltage measuring transformers has been researched during unstable earth arcing.
[1] E. F. Tsapenko, “Zamykanija na zemlju v setjah 6-35 kV” [“Earth faults in networks of 6-35 kV”], Moscow, Russia: Energoatomizdat Publ., 1986, 128 pages.
[2] “Pravyla ulashtuvannia elektroustanovok” [“Regulations of electrical installations arrangement”], 2-nd edit., rev. and enlarged. Kharkiv, Ukraine: Fort Publ., 2009, 736 pages.
[3] O. Ravluk, T. Grechin and V. Ivankiv, “Tsyfrovyi kompleks dlia analizu roboty ta proektuvannia prystroiv releinoho zakhystu i avtomatyky (prohrama RE)” [“In digital system for analysis and design of relay protection and automation control”], Visnyk DU “Lvivska politekhnika” – Bulletin SU “Lviv Polytechnic”, no.340, pp.96-101, 1997.
[4] G. A. Evdokunin, S. V. Gudilin and А. А. Korepanov, “Vybor sposoba zazemlenija nejtrali v setjah 6-10 kV” [“The choice of method of neutral earthing in networks 6-10 kV”], Jelektrichestvo – Electricity, no.12, pp.8-22, 1998.
[5] G. A. Evdokunin and G. А. Tiler, “Sovremennaja vakuumnaja kommutacionnaja tehnika dlja setej srednego naprjazhenija (tehnicheskie preimushhestva i jekspluatacionnye harakteristiki)” [“Modern vacuum switching technology for medium voltage networks (technical advantages and operating characteristics)”], SPb, Russia: Sizova M.P. Publ., 2000, 114 pages.
[6] F. A. Gyndullyn et al., “Perenaprjazhenija v setjah 6-35 kV” [“Overvoltage in networks 6-35 kV”], Moscow, Russia: Energoatomizdat Publ., 1989, 192 pages.