HEXAGON CIRCUIT LINES BREAKER FAIL PROTECTION Russian patent published in 2020 - IPC H02H3/05 

FIELD: electrical engineering.

SUBSTANCE: use in the field of electrical equipment for redundancy in case of failure of switches of lines of open distribution devices of electric stations made as per hexagon scheme. Hexagon circuit lines breaker fail protection with the first line connected to the circuit through the first and second switches, with the second line connected to the circuit through the third and fourth switches, with third line connected to circuit through fifth and sixth switches, with first generator-transformer unit connected to circuit through first and fourth switches, with second generator-transformer unit connected to circuit through third and sixth switches, with third generator-transformer unit, connected to circuit through second and fifth switches, comprises six identical blocks of logic, each of which comprises series-connected first AND element, first time relay and output relay. Seventh, eighth, ninth, tenth, eleventh and twelfth logic units are identical and each contains the second and third AND elements, the first OR element, the second and the third time relays, the first and the second intermediate relays. Thirteenth, fourteenth, fifteenth, sixteenth, seventeenth and eighteenth logic units are made identically and each contains a NAND element, a fourth AND element and a second OR element.

EFFECT: technical result consists in improvement of reliability of operation of device in case of faults of one of its elements, as well as prevention of complete repayment of electric station in case of simultaneous failure of one of switches of any line in case of short circuit on it and switch adjacent to it.

1 cl, 3 dwg