发明名称 |
APPARATUS FOR DETECTING ARCING AND OVERCURRENTS IN DC ELECTRICAL SYSTEMS SUBJECT TO CYCLIC DISTURBANCES |
摘要 |
Arcing in do electrical systems (1) subject to cyclic disturbances is detect ed 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. Th e average sensed do current (35) is also used by the microprocessor (25) to provide overload protection.
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申请公布号 |
CA2399637(A1) |
申请公布日期 |
2003.02.24 |
申请号 |
CA20022399637 |
申请日期 |
2002.08.23 |
申请人 |
EATON CORPORATION |
发明人 |
SCHMALZ, STEVEN CHRISTOPHER;ZUERCHER, JOSEPH CHARLES |
分类号 |
G01R31/12;H02H1/00;H02H1/04;H02H3/00;(IPC1-7):G01R29/00;H01H73/18 |
主分类号 |
G01R31/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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