FIELD: electrical engineering.
SUBSTANCE: device for protection against breaks of secondary circuits of current transformers comprises current transformer with one primary and three secondary windings, first, second and third loads of secondary circuits of current transformers, intermediate transformer with first, second and third primary windings, and secondary winding of intermediate transformer is connected to reacting element, time holding member and actuator, wherein first load and first primary winding of intermediate transformer are connected in series to first secondary winding of current transformer, connected to the second secondary winding of the current transformer are connected in series the second load and the second primary winding of the intermediate transformer, to the third secondary winding of the current transformer there connected is the third load and the third primary winding of the intermediate transformer, first and second primary windings of intermediate transformer are connected according to, and third winding is connected opposite to first and second. According to the invention, the device includes a fourth secondary winding of the current transformer, to which are connected series-connected fourth load and a fourth, connected in accordance with the third winding, primary winding of intermediate transformer, wherein first, second, third and fourth primary windings of intermediate transformer have identical number of turns, and primary winding of current transformer is connected between switch and power transmission line supplying consumers.
EFFECT: monitoring of integrity of secondary circuits of four secondary windings of current transformer, having identical transformation ratio.
1 cl, 1 dwg
