FURNACE TRANSFORMER PROTECTION DEVICE Russian patent published in 2017 - IPC H02H7/04 

FIELD: electricity.

SUBSTANCE: furnace transformer protection device comprising a current and voltage measurement unit, the first and second logic blocks, the output relay contacts of which are connected to the furnace transformer switch opening release, the first, second and third Rogowski coils, the first, second and third isolating transformers, the first second and third rectifiers, the first, second and third subtracters, the first, second and third comparison schemes, the first, second and third standards setting devices, the second logic unit is formed as the first, second, third AND and OR element.

EFFECT: identification of isolated single phase conductors breakage and short circuits between them.

2 dwg