US 9,810,741 B2
Arc-fault and ground fault interrupter using a single ground fault sensor and single ADC
Issa Vignon Dramé, West Allis, WI (US); and Randall James Gass, Cedar Rapids, IA (US)
Assigned to Schneider Electric USA, Inc., Andover, MA (US)
Appl. No. 14/911,685
Filed by SCHNEIDER ELECTRIC USA, INC., Schaumburg, IL (US)
PCT Filed Sep. 13, 2013, PCT No. PCT/US2013/059618
§ 371(c)(1), (2) Date Feb. 11, 2016,
PCT Pub. No. WO2015/038140, PCT Pub. Date Mar. 19, 2015.
Prior Publication US 2016/0202321 A1, Jul. 14, 2016
Int. Cl. H02G 3/16 (2006.01); G01R 31/327 (2006.01); G01R 31/02 (2006.01); H02H 3/16 (2006.01); H02H 3/093 (2006.01); G01R 19/25 (2006.01)
CPC G01R 31/3277 (2013.01) [G01R 31/025 (2013.01); H02H 3/093 (2013.01); H02H 3/16 (2013.01); H02H 3/167 (2013.01); G01R 19/2509 (2013.01); G01R 19/2513 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of performing arc-fault sampling, ground-fault sampling, and grounded-neutral fault sampling in a circuit breaker device, comprising:
performing the arc-fault sampling during a plurality of arc-fault sampling periods, the arc-fault sampling periods occurring at regular intervals and each arc-fault sampling period lasting a fixed duration that is shorter than the time in between consecutive arc-fault sampling periods;
monitoring for an occurrence of a predefined event in the circuit breaker device, the predefined event being timed to occur coincident with one of the plurality of arc-fault sampling periods; and
performing the grounded-neutral fault sampling near the occurrence of the predefined event such that the grounded-neutral fault sampling is performed between said one of the plurality of arc-fault sampling periods and an immediately adjacent arc-fault sampling period;
wherein the arc-fault sampling, ground-fault sampling, and the grounded-neutral fault sampling are performed during a common detection interval.