The present work has to protect a distribution system, the protection of this system will be carried
out based on the levels of short circuit, which will be used through ANAFAS, which is a software
widely used by specific companies and sector related bodies to the country's energy environment.
Based on this assumption, the present work has a concept of concepts about one of the essential
areas in Electrical Engineering, which is the protection of an electrical power system. For this
purpose, the main comprehensive literature on the subject was used, in addition to the ANAFAS
program, which it was essential to obtain the short-circuit levels, because through the results
obtained in the simulation, the current transformers of the subtransmission and of the particular
substation were dimensioned. Regarding the 69 kV location, example 5.3 from the book Protection
of Electrical Systems, by João Mamede Filho, was used. The safeguards for the distribution
transformers and the private substation are based, respectively, on the unified distribution
standards 006 and 002. Thus, the methods used throughout the thesis provided the calculations,
which were used to dimension the protection of the forming regions of the SEP.
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