REDUCED AND INCREASED MAINS VOLTAGE CUTOFF WITH ATTENUATOR Russian patent published in 2019 - IPC H02J3/10 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and is intended for use in power supply systems for stabilization of network single-phase voltage of AC power source of industrial frequency. Purpose of the proposed invention is to protect the load from unallowable voltage drops. Technical result is achieved by the fact that the low and high-voltage circuit breaker with an attenuator is made in the form of a network voltage level sensor, which cuts off the optron-shaped seven-leg key and a control circuit on two transistors. Another optron semiconductor wrench is added to the electric circuit as an attenuator for connection of shunting ballast load at excess of permissible level by grid voltage. Supply voltage parameters of the control circuit are set so that when the mains voltage is lower than the allowable level, the load will be disconnected due to reduction of the gate voltage at the control electrode of the cutting opto-coupon seven-leg key.

EFFECT: protection of load at exceeding of permissible values by mains voltage by means of cutoff optron-controlled seven-leg key with simultaneous connection of another optron-controlled seven-leg key as attenuator for connection of shunting ballast load, as well as load disconnection at lower mains voltage.

1 cl, 1 dwg