DC POWER GRID SYSTEM WITH SEVERAL VOLTAGE LEVELS, AS WELL AS METHOD FOR CONTROLLING AND PROTECTING IT Russian patent published in 2021 - IPC H02H7/26 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering. The DC power grid system includes: at least two DC supply lines; at least one output line current limiter and at least one DC transformer, one end of which is connected to the first DC supply line, and the other to the second DC supply line or the output line. One end of the output line current limiter is connected to the mentioned second DC supply line, and the second end is connected to the output line. The output line current limiter includes the first current limiting unit containing a DC switch, as well as the first bypass switch and the first current limiting resistor unit connected in parallel.

EFFECT: reduction in the coefficient of change of the emergency current, which contributes to the protection of equipment in the DC power grid, and during a failure, no blocking of the DC transformer is required, and after the failure is eliminated, this contributes to the rapid recovery of the system.

14 cl, 9 dwg