US 12,146,904 B2
Fault location system using voltage or current measurement from diverse locations on a distribution network
Yoav Sharon, Evanston, IL (US)
Assigned to S&C Electric Company, Chicago, IL (US)
Filed by S&C Electric Company, Chicago, IL (US)
Filed on Jun. 8, 2022, as Appl. No. 17/834,974.
Application 17/834,974 is a continuation of application No. 16/827,077, filed on Mar. 23, 2020, granted, now 11,378,609.
Claims priority of provisional application 62/823,117, filed on Mar. 25, 2019.
Prior Publication US 2022/0308104 A1, Sep. 29, 2022
Int. Cl. G01R 31/08 (2020.01); G01R 19/25 (2006.01); G01R 21/00 (2006.01); G01R 27/16 (2006.01); G01R 31/62 (2020.01); G01R 31/64 (2020.01); H02H 3/40 (2006.01); H02H 7/26 (2006.01)
CPC G01R 31/086 (2013.01) [G01R 19/2513 (2013.01); G01R 21/003 (2013.01); G01R 27/16 (2013.01); G01R 31/085 (2013.01); G01R 31/62 (2020.01); G01R 31/64 (2020.01); H02H 3/40 (2013.01); H02H 7/261 (2013.01); Y04S 10/52 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for identifying a location of a fault in an electrical power distribution network, the network including a power source, at least one electrical line, a number of spaced apart utility poles supporting the at least one electrical line, and at least one switching device in the electrical line, the at least one switching device being operable to prevent a power signal from flowing through the switching device in response to detecting the fault, the method comprising:
determining an impedance of the at least one electrical line between each pair of adjacent utility poles downstream of the at least one switching device;
estimating a voltage and a current of the power signal in the at least one switching device during the fault, but before the switching device prevents the power signal from flowing therethrough;
estimating a voltage at each of the utility poles downstream of the at least one switching device using the impedance of the electrical line between the utility poles and the measured voltage and current during the fault;
calculating a reactive power value at each of the utility poles using the estimated voltages, wherein calculating a reactive power value includes compensating for distributed loads along the electrical line that consume reactive power during the fault by estimating the reactive power that the distributed loads consume based on a cumulative power rating size of a plurality of distribution transformers that provide power to the distributed loads downstream of the at least one switching device; and
determining the location of the fault based on where the reactive power value goes to zero along the at least one electrical line.