FIELD: electrical engineering.
SUBSTANCE: invention relates to the field of electrical engineering, in particular to automation of electric networks. Voltages at substation input are measured, voltage is measured at input of low voltage of transformer substation on both sides from input switching device, determining the direction of power flow at the input of low voltage of the transformer substation in normal mode, recording the disappearance of voltage at the input of low voltage on both sides of the switching device, voltage recovery at low-voltage input is fixed on both sides of switching device on low side of transformer substation and direction of power flow is determined at input of low voltage of transformer substation, if the power flow after voltage recovery is directed to the power transformer, the fact of unauthorized supply of voltage is recorded from the low side of the transformer substation and signaled about this fact by transmitting information to the electric network dispatching office by one of the known methods.
EFFECT: technical result is increased safety of electric networks servicing.
1 cl, 1 dwg
