Apparatus for detecting arcing and overcurrents in

专利名称：Apparatus for detecting arcing and

overcurrents in DC electrical systems subjectto cyclic disturbances

发明人：Zuercher, Joseph Charles,Schmalz, Steven

Christopher

申请号：EP020123.9申请日：20020823公开号：EP12091A3公开日：20060315

专利附图：

摘要：Arcing in dc 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 thesensor current. The absolute value of the bandpass filtered signal (19) is integrated overrepetitive 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 andgenerates a time attenuated accumulation of the samples that produces an arcing signalif it reaches a predetermined limit. To improve nuisance immunity, the sensed dc current(15) is compared in a high speed comparator (37) to the average sensed dc current (35),and only samples taken by the microprocessor (25) during a predetermined time periodafter the sensed dc current (15) exceeds the average sensed dc current (35) in a

predetermined manner are accumulated. The average sensed dc current (35) is also usedby the microprocessor (25) to provide overload protection.

申请人：Eaton Corporation

地址：Eaton Center, 1111 Superior Avenue Cleveland, Ohio 44114-2584 US

国籍：US

代理机构：Wagner, Karl H.

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