US 12,266,917 B2
Ground fault circuit interrupter (GFCI) devices, systems, and methods
Kenneth Riehl, North Liberty, IA (US); Joseph Hall, Colorado Springs, CO (US); Juan Ignacio Melecio, North Liberty, IA (US); Jeremy D. Schroeder, Cedar Rapids, IA (US); and Jacob B. Guelff, Cedar Rapids, IA (US)
Assigned to Schneider Electric USA, Inc., Boston, MA (US)
Filed by Schneider Electric USA, Inc., Andover, MA (US)
Filed on Apr. 24, 2023, as Appl. No. 18/138,258.
Application 18/138,258 is a continuation of application No. 18/101,060, filed on Jan. 24, 2023.
Claims priority of provisional application 63/436,436, filed on Dec. 30, 2022.
Prior Publication US 2024/0222955 A1, Jul. 4, 2024
Int. Cl. H02H 3/33 (2006.01); H01H 83/14 (2006.01)
CPC H02H 3/331 (2013.01) [H01H 83/144 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A ground fault circuit interrupter (GFCI), comprising:
a first current transformer (CT) comprising:
a first core, wherein the first core is a PCB core or an air core; and
a ground fault (GF) sense winding wound around the first core;
a second CT comprising:
a second core, wherein the second core is a ferromagnetic or nanocrystalline core; and
a grounded neutral (GN) sense winding wound around the second core;
a GF detection module operatively connected to the GF sense winding to receive signals from the GF sense winding and configured to determine whether a line-to-ground fault exists; and
a GN detection module operatively connected to the GN sense winding and configured to receive signals from the GN sense winding to determine whether a neutral-to-ground fault exists;
wherein the first CT includes a test winding wrapped around the first core, wherein the GF sense winding winds around a greater portion of the first core than does the test winding.