The Power Electric Distribution Systems (PEDS) possess a great dynamics of development. Thanks to this phenomenon in the power electric distribution systems (PEDS) the probability of apparatus of asymmetrical regimes increase monotonously. As a result of this reliability of the functioning of the power electric equipment installed in the electric knots changes. The asymmetrical regimes in the power electric distribution systems (PEDS) accompanied by the short circuit current are a function of a row determinate is a vague factor of probabilistic nature.  Coming from it follows that the investigation of the influence of the asymmetrical regimes accompanied by the current of the short circuit on the reliability of the Power Electric Distribution Systems (PEDS) is one of the most important problems of the development the Power Electric Distribution Systems.  The short circuit currents influence the structural and functional reliability of distribution networks and at the reliability of electrical equipment installation.  

Modul de dezvoltare a sistemelor electroenergetice de transport şi distribuţie a energiei electrice dispune de o dinamică destul de pozitivă. Sporirea volumului de livrare a energiei electrice aduce la sporirea puterilor instalate în sistemele respective, care la rîndul lor pot aduce la apariţiilor regimurilor nesimetrice însoţite de curenţi de scurt circuit, care dispun de o influenţă directă asupra indicatorilor de fiabilitate şi a fiabilităţii de funcţionare a sistemelor respective.  

Динамика развития электроэнергетических систем более высокая по сравнению с другими техническими системами. Увеличение объемов выработки и потребления электрической энергии связана с ростом установленных мощностей, что способствуют росту уровней токов короткого замыкания, которые непосредственно влияют на показатели надежности и функциональную надежность установленного электрооборудования.