NEGATIVE-SEQUENCE CURRENT FILTER Russian patent published in 2016 - IPC H02H3/34 G01R29/16 

FIELD: electricity.

SUBSTANCE: negative-sequence current filter for an electric installation with current leads of A, B, C phases located at triangle corners comprises a reed relay with a put on control winding connected to an inductance coil through a in-series connected resistor, a phase-shifting scheme and an amplifier. Two attachment plates are fixed to a beam and support by collars and pull rods. The first and second bodies with plates and the reed relay fixed in them and the inductance coil are fixed to the first and second attachment plates. The third body with the resistor, the phase-shifting scheme and the amplifier in it is placed in the second body above the second plate. At that the control winding is connected through the resistor with the phase-shifting scheme by means of a cable laid in a box. The box is fixed at the second attachment plate, beam and the first attachment plate.

EFFECT: detecting negative-sequence current in current leads with the current leads of A, B, C phases located at arbitrary triangle corners.

3 dwg