CENTRALISED BACKUP PROTECTION DEVICE FOR HEX-CONNECTED CIRCUIT Russian patent published in 2009 - IPC H02H7/22 H02H3/08 

FIELD: electricity.

SUBSTANCE: invention is used in the area of electric engineering. Device contains the first, second, third, fourth, fifth, sixth units of current intensity control (CIC); the first, second, third, fourth, fifth, sixth relays latching "ON" position (ONR); the first, second, third, fourth, fifth, sixth relays latching "OFF" position (OFFR) of the first, second, third, fourth, fifth, sixth switch respectively; three slave relays of blocking units at remote protection devices of the first, second, third line for each phase of the first, second, third, fourth, fifth, sixth current-to-voltage transducers (CTV) made in the form of transductors; the first, second, third, fourth, fifth, sixth summation units; the first, second, third, fourth, fifth, sixth rectifiers; the first, second, third, fourth, fifth, sixth comparator units, unit preventing false tripping (FTP) common for three phases; logic units.

EFFECT: increase of protection sensitivity and reliability.

2 cl, 7 dwg