FIELD: electricity.
SUBSTANCE: device comprises a unit to determine the value of the direction phasor in the measurement point in the three-phase electric network after fault is detected in the three-phase electric network and a unit to compare the value of the direction phasor with directed operating characteristic for the determination of the direction to the fault point from the measurement point. The unit to determine the value of the direction phasor comprises a unit for the formation of the phasor cumulative sum consisting of at least two values defined in different time points, an electric value of the phasor in the measurement point and setting of the phasor cumulative sum as the value for the direction phasor.
EFFECT: direction determination reliability improvement.
14 cl, 7 dwg
