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[References.: p. 104 (13 tit.)]

According to statistics [1], [2] about 50% of severe accidents in electric power systems (EPS), is caused by incorrect actions of the dispatching personnel and the emergency automatic systems, the main reason of which is the use in the design, research and operation of EPS insufficiently complete and reliable information about all possible processes, especially emergency ones, in EPS. The specific operation of EPS practically excludes the possibility of obtaining this information, and the extreme complexity of modern EPS significantly limits the applicability of their physical modeling. As a result, mathematical modeling is the main approach to obtain the information about all possible normal and emergency processes in EPS. The mentioned constantly high percent of the accident in EPS clearly indicates that the existing digital simulation tools do not provide the required completeness and reliability of mathematical simulation, and the efficiency, required for effective dispatch control of EPS. A detailed analysis of these factors is presented in [3]. The level of mathematical description of processes in various elements of power equipment reached by now allows to solve the problems of the development of mathematical models for all types of equipment of EPS, for example [4], [5], describing the whole spectrum of processes without any decomposition. Power transformers and autotransformers as a part of EPS have significant impact on the processes in EPS as a whole, so mathematical models of power transformers and autotransformers should be sufficiently adequate and take into account the technologically and constructively variety.