FIELD: instrument engineering.
SUBSTANCE: device has first residual voltage transformer connected to contact circuit provided with sectioning station, voltage relay having delay in operation, which relay is connected to secondary winding of first voltage transformer. Switches switch contact circuit to buses of traction substation. Filter lowers level of higher harmonics in curve of residual voltage, which voltage enters input of unit for comparing phases of residual voltages of contact circuit and voltage of substation's buses.
EFFECT: improved reliability of operation.
2 dwg
