Arc fault detection in ac electric power systems

Details Arc fault detection in ac electric power systems Arc fault detection in ac electric power systems

G - Physics

01

R

G01R 19/165 (2006.01) H01H 33/26 (2006.01) H02H 1/00 (2006.01) H02J 3/00 (2006.01) H02H 1/04 (2006.01) H02H 3/44 (2006.01)

Patent

CA 2353153

Arc faults in ac electric power systems including aircraft 400 Hz and other such ac electrical systems are detected by an arc fault detector generating a time attenuated cumulative sum of amounts by which the current in each most recent cyclic interval of current, preferably each half cycle, exceeds the magnitude of the current in the immediately preceding cyclic interval in absolute magnitude after a first cyclic interval in which the current exceeds a selected arming magnitude. Preferably, the magnitude detected by a peak detector is used, but alternatively differences in the average magnitude or the rms magnitude between half cycles can be accumulated. When the cumulative sum reaches a preset value, an arc fault indication is generated. The time cumulative sum is cleared if it decreases to a preset value and the selected arming current must be exceeded again to reinitiate generation of the time attenuated cumulative sum.

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