Schneider Electric USA, Inc.

Kenneth Riehl

Jeremy D Schroeder

Joseph Hall

Juan Ignacio Melecio

Jacob B Guelff

Juan Ignacio Melecio Ramirez

Collin Richard Fischels

Adrian Abdala Rendon Hernandez

A ground fault circuit interrupter (GFCI) can include a current transformer (CT) comprising a single core, a first winding wound around the single core, and a second winding wound around the single core. The GFCI can include a ground fault (GF) detection module operatively connected to the first winding to receive signals from the first winding and configured to determine whether a line-to-ground fault exists. The GFCI can also include a GN stimulus operatively connected to the second winding to provide a GN stimulus signal to the second winding. The GFCI can also include a grounded neutral (GN) detection module operatively connected to second winding and configured to receive signals from the second winding to determine whether a neutral-to-ground fault exists.

Ground fault circuit interrupter (GFCI) devices, systems, and methods

Methods/systems for monitoring fault duration in circuit interrupt devices perform edge detection using a second time derivative of a current or voltage waveform. The second derivative reveals peaks that may be used to establish starting and ending times for the fault duration. In some embodiments, the second derivatives are derived only for portions of the waveform within time windows that enclose the fault duration starting and ending times, respectively. The above arrangement provides a consistent way of determining durations of transitory events, such as durations of faults, and the like, that does not rely on waveform zero-crossings. The duration determinations may be implemented locally within a device, and/or the device may acquire and transfer underlying waveform data to an external system for the duration determinations. Data from multiple devices may be collected over time for analysis and modeling to provide remote support and monitoring of local devices via digital twins.

Circuit interrupt device fault duration monitor

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North Liberty, IA, United States of America

Kenneth Riehl