Development of methods and models of analysis of abnormal modes of electric networks with the aim of their optimization - V. H. Kuznetsov; Yu. I. Tuhai; V. I. Koshman; V. V. Kuchanskyi; L. R. Sabarno; Yu. Tuhai; O. H. Shpolianskyi; D. A. Nikishyn (Proceedings of the Institute of Electrodynamics of the National Academy of Sciences of Ukraine, 2019)