HIGH VOLTAGE DC CONTROL Russian patent published in 2021 - IPC H02J3/36 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering. According to the method, a threshold value (L1) of the current strength for the current strength (I₁, I₂) of high voltage direct current transmission is set, at least one interval length (T₁, T₂) for time intervals and for each predetermined interval length (T₁, T₂) a threshold the value (L2, L3) of the change for the length of the interval (T₁, T₂), determined by the time intervals, of the change in the current strength of the current (I₁, I₂). For each pole (7, 8) of high voltage direct current transmission, the current strength (I₁, I₂) is determined and for each given interval length (T₁, T₂), the change in the current strength of the current strength (I₁, I₂) is determined, determined by the time intervals of the interval length (T₁, T₂). A conclusion is made about a DC fault if the value of the current strength (I₁, I₂) of at least one pole (7, 8) is greater than the threshold value (L1) of the current strength, or for the length of the interval (T₁, T₂) the value of a certain change current strengths current strength (I₁, I₂) of at least one pole (7, 8) is greater than the change threshold (L2, L3) set for the interval length (T₁, T₂).

EFFECT: improves DC fault detection speed.

14 cl, 5 dwg