Abstract: A DC distance protection controller for identifying a fault within a protection zone that extends between a first terminal and a set point along a DC power transmission conduit which lies between the first terminal and a second terminal within a DC electrical power network. The protection controller periodically obtains as respective sampled pairs a measured voltage value and a measured current value of the DC power transmission conduit; isolates a fault component voltage value and a fault component current value to define a respective corresponding isolated pair; calculates from each isolated pair a fault component operating voltage of the DC power transmission conduit at the set point; compare a given calculated fault component operating voltage with a historical voltage value; and identifies a fault within the protection zone when the given calculated fault component operating voltage is greater than the historical voltage value.

Abstract: In the field of multi-terminal electrical power network protection, a protection apparatus comprises a measurement apparatus to measure the respective terminal current (IL, IR1, IR2, IR3, IR4, IR5) flowing at each terminal (L, R1, R2, R3, R4, R5) in a multi-terminal network that includes a plurality of electrically interconnected terminals (L, R1, R2, R3, R4, R5). The protection apparatus also includes a control unit that is programmed to process the measured terminal currents (IL, IR1, IR2, IR3, IR4, IR5) to obtain first and second summed values (IPOS(n), INEG(n)).

Abstract: A DC distance protection controller for identifying a fault within a protection zone that extends between a first terminal and a set point along a DC power transmission conduit which lies between the first terminal and a second terminal within a DC electrical power network. The protection controller periodically obtains as respective sampled pairs a measured voltage value and a measured current value of the DC power transmission conduit; isolates a fault component voltage value and a fault component current value to define a respective corresponding isolated pair; calculates from each isolated pair a fault component operating voltage of the DC power transmission conduit at the set point; compare a given calculated fault component operating voltage with a historical voltage value; and identifies a fault within the protection zone when the given calculated fault component operating voltage is greater than the historical voltage value.

Abstract: In the field of multi-terminal electrical power network protection, a protection apparatus comprises a measurement apparatus to measure the respective terminal current (IL, IR1, IR2, IR3, IR4, IR5) flowing at each terminal (L, R1, R2, R3, R4, R5) in a multi-terminal network that includes a plurality of electrically interconnected terminals (L, R1, R2, R3, R4, R5). The protection apparatus also includes a control unit that is programmed to process the measured terminal currents (IL, IR1, IR2, IR3, IR4, IR5) to obtain first and second summed values (IPOS(n), INEG(n)).