G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 29/00 (2006.01) H01H 73/18 (2006.01) H02H 1/00 (2006.01) H02H 1/04 (2006.01)
Patent
CA 2399637
Arcing in do electrical systems (1) subject to cyclic disturbances is detected by a current sensor (13), and a bandpass filter (17) sensitive to arcing noise, which filters the sensor current. The absolute value of the bandpass filtered signal (19) is integrated aver repetitive intervals in a resettable analog integrator (27). A low cost microprocessor (25) samples and resets the analog integrator (17) at a frequency below the pass band and generates a time attenuated accumulation of the samples that produces an arcing signal if it reaches a predetermined limit. To improve nuisance immunity, the sensed do current (15) is compared in a high speed comparator (37) to the average sensed do current (35), and only samples taken by the microprocessor (25) during a predetermined time period after the sensed do current (15) exceeds the average sensed do current (35) in a predetermined manner are accumulated. The average sensed do current (35) is also used by the microprocessor (25) to provide overload protection.
Schmalz Steven Christopher
Zuercher Joseph Charles
Borden Ladner Gervais Llp
Corporation Eaton
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