TRANSFORMER DIFFERENTIAL CUT-OFF Russian patent published in 2010 - IPC H02H7/45 

FIELD: electricity.

SUBSTANCE: there is proposed usage of a known connection of a differential circuit to a minor thermostable resistor and then - to an inertial circuit, a stabilitron voltage limiter, a capacitor, a transformer and then, through a ballast resistor, to a resonance circuit wherein the relay windings as the inductance. For improvement of the relay terminals operation its additional terminals, in case of actuation, are bypassed in the course of actuation into the said ballast resistor. At the same time an inertial drum with loose filler is added to the relay structure eliminating incidental armature "bursts"; alternatively, one uses a relay already equipped with such a drum.

EFFECT: simple and reliable transformer cut-off is performed.

1 dwg