US 12,394,578 B2
Determination of electrical making instants using load voltage for coupled loads
Mehulbhai Ghanshyambhai Sonagra, Gujarat (IN); Urmil Parikh, Ludvika (SE); and Michael Stanek, Gebenstorf (CH)
Assigned to HITACHI ENERGY LTD, Zürich (CH)
Appl. No. 18/565,840
Filed by Hitachi Energy Ltd, Zürich (CH)
PCT Filed May 24, 2022, PCT No. PCT/EP2022/064135
§ 371(c)(1), (2) Date Nov. 30, 2023,
PCT Pub. No. WO2022/253653, PCT Pub. Date Dec. 8, 2022.
Claims priority of application No. 202121025032 (IN), filed on Jun. 4, 2021.
Prior Publication US 2024/0258046 A1, Aug. 1, 2024
Int. Cl. H01H 33/59 (2006.01); H01H 9/54 (2006.01)
CPC H01H 9/54 (2013.01) 14 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining a measured terminal voltage of each phase of one or more phases of an electrical equipment from a voltage measuring device, during an energization operation of the electrical equipment through a switching device, wherein the phases of the electrical equipment are electrically or magnetically coupled to each other;
obtaining circuit configuration parameters associated with the electrical equipment;
determining a processed voltage for the one or more phases of the electrical equipment based on one or more of the measured terminal voltages of the electrical equipment and a mapping table, wherein the mapping table comprises a mapping between the circuit configuration parameters and a computation to be performed on one or more of the measured terminal voltages; and
determining an electrical making instant of a pole of the switching device associated with a phase of the one or more phases based on the processed voltage for monitoring the energization operation of the electrical equipment as an instant corresponding to a start of a rising slope of the processed voltage, when the rising slope crosses a pre-determined phase-wise threshold value to reach a first voltage peak.