1. Bernas, S. & Zech, Z. 1982. Mathematical models of electroenergy systems elements (in Russian). Moscow: Energy issue: 312. Wilgame, R. & Waters, M. 1959. Neutral grounding in high-voltage systems (in Russian). Moscow: State energy issue: 415. Pivnyak, G.G. & Shkrabets, F.P. 1993. Assymetrical damages in electrical mains of open-pits: reference book (in Russian). Moscow: Nedra: 192. Samoylovich, I. S. 1976. Neutral modes in electrical mains of open-pits (in Russian). Moscow: Nedra: 175. Sirota, I.M., Kislenko, S.N. & Mikhaylov, A.M. 1985. Neutral modes of electrical mains (in Russian). Kyiv: Scientific thought: 264. Sirota I.M. 1974. Influence of neutral in mains of 6-35 kV on safety conditions (in Russian). Neutral modes in electrical systems: Kyiv: Scientific thought: 84-104.