METHOD FOR PROTECTING AN ELECTRIC SUPPLY LINE AND DEVICE FOR ITS REALIZATION Russian patent published in 2008 - IPC H02H3/32 

FIELD: systems for protecting electric lines which react to difference between currents, in which values of voltage or current are compared in corresponding points on different wires of one and the same circuit, for example by current in direct and reverse conductor.

SUBSTANCE: method for protecting electric line includes measuring value and direction of currents at ends of electric line, recognizing presence of short circuits or temporary contact in network by determining frequency of network closures determined on basis of current appearance moments in direct wire, generation of working signal for disabling electric line when frequency of closures of network exceeds given value. Device for protecting electric line contains switch, current sensor, shift register, impulse generator, first and second electronic switches, where output of current sensor is connected to right shift input of shift register, output of impulse generator is connected to left shift input of shift register, output of which is connected to control inputs of first and second electronic switches.

EFFECT: ensured capability for recognition of presence of short circuits in network which may cause combustion.

2 cl, 1 dwg