US 11,791,622 B2
Time-admittance fault detection and isolation system
Joseph R Rostron, Hampton, GA (US); and Jiyuan Fan, Hampton, GA (US)
Assigned to SOUTHERN STATES, LLC, Hampton, GA (US)
Filed by Southern States, LLC, Hampton, GA (US)
Filed on May 11, 2022, as Appl. No. 17/741,502.
Claims priority of provisional application 63/191,304, filed on May 20, 2021.
Prior Publication US 2022/0376491 A1, Nov. 24, 2022
Int. Cl. H02H 7/22 (2006.01); H02H 1/00 (2006.01)
CPC H02H 7/222 (2013.01) [H02H 1/0007 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A fault detection and isolation system for detecting and isolating inverted-limited faults occurring on an electric power line extending downstream from an upstream inverter-limited power source, comprising a plurality of time-admittance switches spaced apart along the electric power line, configured to perform a method comprising:
storing a respective time-admittance function at each time-admittance switch, wherein the time-admittance functions define a cascade trip sequence for the time-admittance switches in a downstream-to-upstream direction;
detecting an inverter-limited fault at one or more of the time-admittance switches upstream from the fault, while not detecting the fault at one or more of the time-admittance switch downstream from the fault;
autonomously tripping a closest upstream time-admittance switch to the fault to isolate the fault on an upstream side of the fault without communication among the time-admittance switches.