METHOD TO INCREASE POWER RATIO IN RECUPERATIVE BRAKING OF ELECTRIC LOCOMOTIVE AND DEVICE FOR ITS REALISATION Russian patent published in 2012 - IPC H02P3/00 

FIELD: electricity.

SUBSTANCE: some ballast resistors of a unit of ballast resistors are shunted with a control switch at the moments, when the grid voltage exceeds a certain threshold level, or information may be used to lock the switch on a moment of grid voltage transition via zero, and the locked condition of the shunting switch is carried out in the range of time of 30-150 electric degrees from the moment of grid voltage transition through zero. A device comprises a transformer, a thyristor rectifying-inverter converter, a smoothening reactor, a traction electric motor, diodes, ballast resistors, shunting switches, a circuit of shunting control, at the same time resistors of the unit of ballast resistors are arranged in the form of two or more serially connected resistors, one or more of which is connected in parallel with the shunting switch and is shunted with a switch controlled by a control circuit. Ballast resistors may be arranged in the form of two or more parallel connected resistors, one or more of which are connected in series with a shunting switch. IGBT transistors may be used as switches.

EFFECT: higher power ration in recuperation mode.

5 cl, 3 dwg