US 12,146,924 B2
Method for monitoring an electrical power transmission system and an associated device
Martin Molby Henriksen, Lyons (FR); and Ludovic Stéphane Boyer, Saint Joseph (FR)
Assigned to SUPERGRID INSTITUTE, Villeurbanne (FR)
Appl. No. 17/924,470
Filed by SUPERGRID INSTITUTE, Villeurbanne (FR)
PCT Filed May 11, 2021, PCT No. PCT/EP2021/062409
§ 371(c)(1), (2) Date Nov. 10, 2022,
PCT Pub. No. WO2021/228806, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 2004784 (FR), filed on May 14, 2020.
Prior Publication US 2023/0341473 A1, Oct. 26, 2023
Int. Cl. G01R 31/00 (2006.01); G01R 31/08 (2020.01); G01R 31/52 (2020.01); G01R 31/58 (2020.01)
CPC G01R 31/52 (2020.01) [G01R 31/003 (2013.01); G01R 31/083 (2013.01); G01R 31/58 (2020.01)] 17 Claims
OG exemplary drawing
 
1. A method for monitoring an electrical power transmission system for a DC electrical power transmission network with an electrical power transmission cable comprising:
determining, along a measurement segment, at least one profile of a temperature parameter,
determining a theoretical leakage current (I_leak-theo) between the ground connections of the measurement segment taking into account the temperature parameter profiles and a load current and voltage,
measuring a leakage current (I leak-mes) between the ground connections of the measuring measurement segment, and
generating an alert if a difference between the theoretical leakage current (I_leak-theo) and the measured leakage current (I_leak-mes) exceeds a predetermined threshold;
wherein the electrical power transmission cable comprises
an electrically conductive central core configured to transmit an electrical current,
an insulating jacket electrically disposed around the central core,
a metal shield arranged around the insulating jacket, and
the ground connections of the metal shield, the measurement segment being defined between two successive grounding connections.