DEVICE FOR MAGNETIC FIELD KILLING WHEN SYNCHRONOUS MACHINE EXCITATION WINDING IS DISCONNECTED FROM POWER SUPPLY Russian patent published in 2013 - IPC H02P7/14 H02P9/30 H02J7/14 H02H7/09 

FIELD: electrical engineering.

SUBSTANCE: device for magnetic field killing when the synchronous machine excitation winding is disconnected from the power supply contains a switching apparatus (1), placed in parallel to the power supply (2) and the excitation winding (3); connected parallel to the said winding is a circuit consisting of an active resistance (4) and a circuit, placed in parallel; the latter circuit contains two thyristors (5, 6) or a thyristor and a diode, parallel and back-to-back. The device also contains a circuit with low resistance represented by or placed parallel to the circuit excitation winding containing a control key (7) or connected parallel to the active resistance (4) of the circuit containing a diode or thyristor (8) and a capacitor (9), serially placed; connected parallel to the capacitor is a discharge resistor (10).

EFFECT: ensuring the possibility of the switching apparatus application without increase of switching properties with magnetic field efficiently killed.

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