With the development of economy and mankind the electric
distribution networks and technical and technological solutions
of the equipment connected to them are also changing resulting
in the changes of its application opportunities and requirements
to quality of the supplied energy. The basic task of an electric
supply network operator is to provide a customer with energy
supply of a necessary level of reliability and quality with as
low financial expenses as possible.
The evaluation of interruptions risks of an electric supply
system requires knowledge of the structure of network, its load
and customers data. In 90 % of all the electric energy failures
the problem of energy supply reliability is at the level of
distribution networks – in the elements of the supply network
(overhead lines, cables, transformer substations, breakers,
switches, etc.), therefore the improvement of the distribution
network reliability is a question of top importance