Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Reexamination Certificate
2005-02-22
2005-02-22
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
Reexamination Certificate
active
06859042
ABSTRACT:
A method and apparatus for detecting electrical arcs in an electrical system having a periodic power supply is disclosed. A method according to the invention compares instantaneous values of a monitored waveform both with (a) their past values at corresponding phases of the AC supply waveform, and (b) their future values at corresponding phases of the AC supply waveform. The monitored waveform is delayed or stored to allow such comparisons in near real time, to produce an output which is only slightly delayed behind the monitored waveform. An apparatus according to the present invention discloses a sampling circuit that samples electrical signals indicative of transient load conditions to produce a sampling circuit output. A storage device receives the sampling circuit's output and stores a time history of that output over an interval. A subtracting circuit receives the stored time history and subtract the time history from both of (a) a delayed version of the history, and (b) an advanced version of the history. An alarm circuit receives the output of the subtracting circuit.
REFERENCES:
patent: 5434509 (1995-07-01), Blades
patent: 5729145 (1998-03-01), Blades
patent: 5854590 (1998-12-01), Dalstein
patent: 6400258 (2002-06-01), Parker
Deb Anjan
Hendry Mechanical Works
Koppel, Jacobs Patrick & Heybl
Lair Donald M
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