DIFFERENTIAL CURRENT TRANSFORMER Russian patent published in 2005 - IPC

FIELD: electrical engineering.

SUBSTANCE: proposed differential current transformer that can be used as component part of computer-based control systems and tripping devices responding to differential current for protection against electric shock, fire set up due to leakage current heat, overload and short-circuit currents has primary winding assembled of three three-phase mains conductors spaced 120 deg. apart. Secondary winding is assembled of sections. One plus p identically wound coils of first section are connected in series through equal angles. Each coil has n turns. Six identically wound coils, each having m turns, are paired, disposed in diametrical opposition, and integrated in three sections. Coils are differentially connected in each section. One of coils in each section is tightly fitted to respective conductor of primary winding.

EFFECT: provision for electric isolation of differential current signals proportional to leakage current and unbalance signal proportional to load.

4 cl, 3 dwg