DIRECTIONAL CURRENT PROTECTION DEVICE Russian patent published in 2024 - IPC H01H83/18 H02H3/08 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, namely to relay protection, and can be used for electrical installations as maximum directional current protection with blocking of minimum voltage. Device of directional current protection contains three inductance coils (1-3) and microprocessor (5). First inductance coil (1) is located on the frame of the draw-out element of the cell of the integrated switchgear opposite current-carrying bus (7) in the area of maximum value of magnetic flux and is connected to outputs of current amplifier (4). Second inductance coil (2) is placed in the relay compartment of the integrated switchgear cell and its outputs are connected to the input of microprocessor (5), the outputs of which are connected to voltage amplifier (6). Third inductance coil (3) is wound on current-carrying bus (7) of the integrated switchgear so that it is located above first inductance coil (1) and is connected to second inductance coil (2). Third inductance coil (3) comprises two windings with a ratio of the number of turns of 1:5 and forms a step-up measuring voltage transformer, wherein voltage of the first winding is 20 V, and voltage of the second winding is 100 V. Output of the secondary winding is connected to the input of second inductance coil (2). Outputs of current amplifier (4) are connected to current winding (8) of power direction relay (9). Outputs of voltage amplifier (6) are connected to voltage winding (10) of power direction relay (9). Contact for closing (12) of the power direction relay is connected to the positive pole of direct current source (11) and to the first output of winding (13) of time relay (14), and contact with time delay for closing (15) of time relay (14) is connected to positive pole of direct current source (11) and to first output of indicating relay (16), which is connected to the first output of tripping coil (17) of the switch of cell of integrated switchgear (18). Second output of winding (13) of time relay (14) and the second output of the winding of tripping coil (17) are connected to the negative pole of the DC source.

EFFECT: development of a device for directional current protection with blocking of minimum voltage.

1 cl, 2 dwg