PROTECTION DEVICE FOR ELECTRIC POWER METERS AND CONSUMERS AGAINST ASYMMETRY OF SUPPLY VOLTAGES Russian patent published in 2020 - IPC H02H5/10 

FIELD: electrical engineering.

SUBSTANCE: device for protection of electric energy meters and consumers against asymmetry of supply voltages includes three-phase automatic circuit breaker with actuating element, which is connected to amplifier, and mixed three-phase load is connected to power transmission line. Three phase conductors pass through three-phase automatic circuit breaker and with zero conductor enter the window of magnetic conductor of zero sequence current transformer, which secondary winding is connected through said amplifier to actuator, and the output wires from the zero sequence current transformer magnetic circuit window are connected to the three-phase power meter, after which the mixed three-phase loads are connected to the power transmission lines with taps, wherein at the end of each three-phase branch of the line to the phase wires zero sequence voltage filters are connected, connected by their zero points through threshold elements with additionally introduced grounding devices.

EFFECT: providing protection of electric energy and consumer counters against unbalance of supply voltages, at which voltage failure both of consumers and voltage windings of three-phase and single-phase electric energy meters is possible.

1 cl, 1 dwg