Electrical transmission or interconnection systems – Switching systems – Condition responsive
Reexamination Certificate
2007-10-24
2011-11-15
Fureman, Jared (Department: 2836)
Electrical transmission or interconnection systems
Switching systems
Condition responsive
C307S129000
Reexamination Certificate
active
08058751
ABSTRACT:
A circuit breaker includes a line terminal, a load terminal, separable contacts electrically connected in series between the terminals, a neutral conductor, and an operating mechanism structured to open and close the contacts and trip open the contacts in response to a trip signal. A first sensor senses an electrical characteristic operatively associated with the contacts. A second sensor detects zero crossings, a consecutive pair of the crossings defining a corresponding half-cycle and a first frequency. A processor cooperates with the sensors and includes a routine and a timer having a second frequency. The routine determines, for each of the half-cycles and responsive to the timer, plural samples of the sensed electrical characteristic in a phase synchronized relationship to a corresponding one of the crossings, and determines whether one of the frequencies exceeds a number of corresponding predetermined values for a number of times and responsively outputs the trip signal.
REFERENCES:
patent: 4782422 (1988-11-01), Jones et al.
patent: 4788619 (1988-11-01), Ott et al.
patent: 5224006 (1993-06-01), MacKenzie et al.
patent: 5260676 (1993-11-01), Patel et al.
patent: 5293522 (1994-03-01), Fello et al.
patent: 5428495 (1995-06-01), Murphy et al.
patent: 5559719 (1996-09-01), Johnson et al.
patent: 5691869 (1997-11-01), Engel et al.
patent: 5729145 (1998-03-01), Blades
patent: 5875087 (1999-02-01), Spencer et al.
patent: 6611411 (2003-08-01), Williams et al.
patent: 6717394 (2004-04-01), Elms
patent: 6779125 (2004-08-01), Haban
patent: 6859042 (2005-02-01), Parker
patent: 7193827 (2007-03-01), Reid et al.
patent: 7391218 (2008-06-01), Kojori et al.
patent: 7633728 (2009-12-01), Parker et al.
patent: 7633736 (2009-12-01), Domitrovich et al.
patent: 7636616 (2009-12-01), Fletcher et al.
patent: 7864492 (2011-01-01), Restrepo et al.
Underwriters Laboratories Inc. (UL), “Software in Programmable Components”, UL 1998 ISBN 0-7629-0321-X, May 29, 1998, 38 pp.
Amrany Adi
Eaton Corporation
Fureman Jared
Moran Martin J.
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