substation

6–35 kV electrical networks operates with isolated or compensated neutrals. Such mode of a neutral is the reason of emergence of considerable overvoltage in an electrical network during single- phase ground fault (SFGF), especially during short-circuit through an arc and various ferro-resonance phenomena. These overvoltage destroy the insulation of the electrically coupled network.

The physical model of the system of operative-dispatch control of substations with application of devices “Altra” is developed.