US 12,266,925 B2
Transmission line fault location, isolation and system restoration (FLISR) system
Michael John Meisinger, Sr., Chicago, IL (US); Martin T. Bishop, Oak Creek, WI (US); and Stephen E. Williams, Caledonea, WI (US)
Assigned to S&C Electric Company, Chicago, IL (US)
Filed by S&C Electric Company, Chicago, IL (US)
Filed on Jun. 30, 2022, as Appl. No. 17/853,977.
Claims priority of provisional application 63/232,318, filed on Aug. 12, 2021.
Prior Publication US 2023/0052174 A1, Feb. 16, 2023
Int. Cl. H02H 7/22 (2006.01); H02H 1/00 (2006.01)
CPC H02H 7/22 (2013.01) [H02H 1/0007 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A power restoration system for an electrical power network, the power restoration system comprising:
a power line;
at least one power source providing power to the power line;
at least one fault interrupting device electrically coupled to the power line, the at least one fault interrupting device being operable to detect fault current and perform reclosing operations;
a plurality of switching devices electrically coupled along the power line downstream of the at least one fault interrupting device, the plurality of switching devices each having current and voltage sensing capability, have the capability to provide pulse testing for detecting fault presence using a low energy pulse and have the same or similar opening response time, wherein in response to a fault on the power line, the at least one fault interrupting device performs reclosing operations, and when the plurality of switching devices detect fault current a predetermined number of times in coordination with reclosing operations performed by the at least one fault interrupting device and detect loss of voltage when the at least one fault interrupting device opens again will open; and,
the at least one fault interrupting device closes when the plurality of switching devices are opened as a result of detecting the predetermined number of fault current passages, and wherein the plurality of the switching devices sequentially pulse test and close from a furthest upstream switching device when detecting return of voltage and no fault presence until a switching device closest to the fault pulse tests and detects fault presence and locks open.