Sensata Technologies, Inc.

Sensata Technologies Massachusetts, Inc.

Robert Zanelli

Keith W Kawate

Christian V Pellon

Lucien Paul Fontaine

Michael T Parker

Michael J Lavado

Christopher A Nicolls

Mark David Rabiner

Roger D Mayer

Lynwald Edmunds

Jeffrey B Ting

Lucien Fontaine

Michael Parker

An apparatus and method for detecting arc faults that have reduced susceptibility to nuisance tripping. The apparatus includes a current sensor, an input sense circuit, an arcing sense circuit, a power supply, a tripping (firing) circuit, a processor, and an electromechanical interface. The current sensor monitors a power input comprising an AC current, and provides high frequency components of the. AC current to the input sense circuit. The input sense circuit filters and rectifies the AC signal, and provides the rectified signal to the arcing sense circuit. The arcing sense circuit provides a voltage level accumulated over a predetermined time period, and digital signals indicative of possible electrical arcing occurring during the sampling period, to the processor. The processor measures the voltage level, stores information relating to measured voltages and the digital signals, and processes the stored information using one or more algorithms, thereby determining whether the signals resulted from an arc fault or a nuisance load. In the event the signals resulted from an arc fault, the processor activates the firing circuit to trip the electromechanical interface, thereby interrupting the power output to the load.

Apparatus for detecting arc faults

Method for detecting arc faults

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Rehoboth, MA, United States of America

Robert Zanelli