US 12,345,753 B2
Method for determining conductors involved in a fault on a power transmission line and fault location using local current measurements
Athula Dayanarth Rajapakse, Winnipeg (CA); Naushath Mohamed Haleem, Winnipeg (CA); and Jagannath Sri Wijekoon, Winnipeg (CA)
Assigned to University of Manitoba, Winnipeg (CA)
Filed by University of Manitoba, Winnipeg (CA)
Filed on Mar. 8, 2024, as Appl. No. 18/600,022.
Application 18/600,022 is a continuation of application No. 17/287,786, granted, now 11,971,440, previously published as PCT/CA2019/051556, filed on Nov. 1, 2019.
Claims priority of provisional application 62/754,005, filed on Nov. 1, 2018.
Prior Publication US 2024/0288482 A1, Aug. 29, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G01R 31/08 (2020.01); H02J 3/00 (2006.01); H02J 3/36 (2006.01); H02J 13/00 (2006.01)
CPC G01R 31/085 (2013.01) [H02J 3/0012 (2020.01); H02J 3/36 (2013.01); H02J 13/00002 (2020.01); H02J 2203/20 (2020.01)] 4 Claims
OG exemplary drawing
 
1. A method for identifying one or more faulted conductors among operating conductors in a power transmission system including a ground when a fault event has occurred in the power transmission system in which at least two of the operating conductors transmit power, wherein the power-transmitting conductors are respectively operably connected between first and second sets of terminals so as to transmit the power along the power-transmitting conductors from the first set of terminals to the second set of terminals, the method comprising:
monitoring current signals which are representative of currents in the power-transmitting conductors at a generally common location within the power transmission system, wherein monitoring the current signals comprises measuring the current in each one of the power-transmitting conductors at or generally in proximity to a common selected one of the first and second sets of terminals;
filtering the current signals to produce filtered current signals associated with respective ones of the power-transmitting conductors;
determining a maximum rate of change of each filtered current signal within a predetermined time interval after the fault event has commenced;
calculating a plurality of ratios, each ratio being between a pair of the maximum rates of change of the filtered current signals associated with different pairs of the operating conductors;
comparing the ratios against a plurality of threshold values in which at least one of the threshold values is a positive constant representative of a minimum ratio of a pair of the maximum rates of change of the filtered current signals based on a fault occurring at a maximum distance from the generally common location at which the current signals are monitored; and
determining either (i) one or more of the operating conductors are faulted conductors faulted in parallel with the ground or (ii) two or more operating conductors are faulted conductors faulted in parallel with one another based on a result of the comparison of the ratios to the threshold values.