US 12,278,472 B2
Fault classification and zone identification in a power transmission system
Od Naidu, Karnataka (IN); and Neethu George, Karnataka (IN)
Assigned to HITACHI ENERGY LTD, Zürich (CH)
Appl. No. 18/269,989
Filed by HITACHI ENERGY LTD, Zürich (CH)
PCT Filed Dec. 22, 2021, PCT No. PCT/EP2021/087399
§ 371(c)(1), (2) Date Jun. 28, 2023,
PCT Pub. No. WO2022/144286, PCT Pub. Date Jul. 7, 2022.
Claims priority of application No. 202041057544 (IN), filed on Dec. 31, 2020; and application No. 21172518 (EP), filed on May 6, 2021.
Prior Publication US 2024/0063626 A1, Feb. 22, 2024
Int. Cl. H02H 1/00 (2006.01); G01R 31/08 (2020.01); H02H 7/22 (2006.01)
CPC H02H 1/0007 (2013.01) [G01R 31/085 (2013.01); H02H 7/226 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for zone identification of a fault comprising:
identifying a zone of a transmission line where the fault lies based on traveling wave signals when a difference between a computed line length and an actual line length is less than a threshold line length; and
identifying the zone of the transmission line where the fault lies based on a rate of change of incremental terminal current with reference to time when the difference between the computed line length and the actual line length is greater than the threshold line length.