ABSTRACT
At present, requirements to the reliability and continuity of power supply for industrial enterprises are increasing. The reliability of power supply systems is largely determined by the failure-free operation of transmission lines, and the distribution networks 6-35 kV constitute a considerable part of them. It is known that most faults that occur in the power supply systems (about 80%) fall exactly on the distribution networks. The distribution networks fault analysis shows that up to 60-90% of all failures are the ground faults.
