US 12,188,993 B2
Methods for detecting an electrical fault, associated electrical protection systems
Daniel Gonzalez, Domene (FR)
Assigned to Schneider Electric Industries SAS, Rueil-Malmaison (FR)
Filed by Schneider Electric Industries SAS, Rueil Malmaison (FR)
Filed on Dec. 6, 2022, as Appl. No. 18/075,546.
Claims priority of application No. 2113499 (FR), filed on Dec. 14, 2021.
Prior Publication US 2023/0184849 A1, Jun. 15, 2023
Int. Cl. G01R 31/52 (2020.01); G01R 31/56 (2020.01); H02H 3/32 (2006.01)
CPC G01R 31/52 (2020.01) [G01R 31/56 (2020.01); H02H 3/32 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for protecting an electrical installation, said electrical installation comprising a power source based on a switched-mode power converter, the method comprising:
measuring, with a sensor associated with an electrical protection device protecting the installation, an alternating electric current flowing through the electrical installation;
detecting an electrical fault on the basis of the measured alternating electric current, by means of an electronic control device; and
controlling tripping of the electrical protection device when the electrical fault is detected by the electronic control device;
wherein detecting the electrical fault includes identifying a transition of the measured alternating electric current from a first level to a second level, said transition having a duration lower than a predefined threshold, the predefined threshold being lower than or equal to 10% of a nominal period of the alternating electric current, the first level and the second level corresponding to current values of opposite sign but an amplitude of which, in terms of absolute value, is higher than a predefined current threshold, the predefined current threshold being equal to a product of a trip threshold of the electrical protection device and a weighting coefficient, and the electrical fault is detected if the transition of the measured current is identified.