DEVICE FOR PROTECTION AGAINST BREAKING OF SECONDARY CIRCUITS OF CURRENT TRANSFORMERS Russian patent published in 2017 - IPC H02H7/04 

FIELD: electricity.

SUBSTANCE: invention relates to relay protection of power supply elements and can be used in cases when alternating-current power circuits use current transformers with two secondary windings. Opening of secondary transformer winding current causes increase of active energy losses in steel, overheating of core, damage to insulation of secondary winding, threat to service personnel from high voltage and, in some cases, fires.

EFFECT: technical result is that circuit includes an intermediate transformer with two primary windings and one secondary winding, wherein one secondary winding of current transformer is connected in series to a first load and first primary winding of intermediate transformer, second secondary winding of current transformer is connected in series to a second load and second primary winding of intermediate transformer, connected anti-parallel to first primary winding of intermediate transformer, and secondary winding of intermediate transformer is connected to a reactive element, time delay element and actuating element.

1 cl, 1 dwg