FIELD: automation of electric networks.
SUBSTANCE: invention relates to automation of electric networks and is intended for signaling and informing personnel of electric network organization and disconnection of input switching device of transformer substation at unauthorized supply of voltage from low side of transformer substation. In compliance with proposed method voltage is measured at input of low voltage of power transformer of transformer substation on both sides from input switching device at low side of transformer substation, determining direction of power flow in normal mode towards outgoing line low-voltage power lines, disappearance of voltage at input of low voltage on both sides from switching device on low side of transformer substation, thereafter, voltage recovery at the low voltage input is recorded on both sides of the switching device on the low side of the transformer substation and the power flow direction at the input is determined, if power flow after voltage recovery is directed to power transformer of transformer substation, then fact of unauthorized supply of voltage is detected from low side of transformer substation, disabling input switching device on low side of transformer substation, signaling the unauthorized supply of voltage by transmitting information to the electric power network dispatching office and displaying the information on-site.
EFFECT: higher safety of electric networks.
1 cl, 1 dwg
