METHOD FOR PROTECTING ELECTRIC LINES AND DEVICE FOR ITS REALIZATION Russian patent published in 2007 - IPC H02H3/32 

FIELD: engineering of systems for protecting electric lines, reacting to difference in currents, where values of voltage or current are compared in appropriate points on different wires of one and the same circuit, for example, current in reverse and direct conductor.

SUBSTANCE: circuit of electric line protection device features first and second current indicators, subtraction circuit, circuit for measuring current difference speed, threshold device and first and second electronic switches, where outputs of first and second current sensors are connected to inputs of subtraction system, output of which through the circuit for measuring speed of change of current difference is connected to input of threshold device, output of which is connected to inputs of first and second electronic switch.

EFFECT: increased speed of operation due to measurement of current difference changing speed in direct and reverse wire and electronic disabling of network.

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