Afci which detects and interrupts line side arcing

Details Afci which detects and interrupts line side arcing Afci which detects and interrupts line side arcing

H - Electricity

02

H

H02H 3/26 (2006.01) H01H 83/10 (2006.01)

Patent

CA 2334134

An arc fault causes the line voltage across the line terminals of an arc fault circuit interrupter (AFCI) to change its characteristic voltage pulse shape as the line voltage is momentarily removed from the AFCI terminals after the arc extinguishes and before it re-strikes by introducing a flat voltage portion to the pulse shape. This flat voltage portion changes the voltage pulse width. An arc detector/processor detects this change in pulse width to produce a signal indicative of upstream (line side) arcing. The flat voltage portion can also be detected using clamping diodes and charging capacitors.

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