Fault recording and sequence of events recording device...

Details Fault recording and sequence of events recording device... Fault recording and sequence of events recording device...

2004-08-03

2009-06-23

Britt, Cynthia (Department: 2117)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Testing of error-check system

C361S062000, C361S086000, C361S087000, C361S088000, C702S057000, C702S120000, C702S122000, C340S635000

Reexamination Certificate

active

07552367

ABSTRACT:
A method for recording analog signals and digitally encoded information associated with primary and secondary devices of an electric power system includes: receiving a plurality of analog output signals and a plurality of ON/OFF status signals from the electric power system; receiving a time-synchronization analog signal and/or a time-synchronization data packet from a time synchronization source; maintaining an internal clock synchronized with the synchronization source; sampling and digitizing the plurality of analog output signals; monitoring a status and/or a change of status of the plurality of ON/OFF status signals; receiving digitally encoded information signals as incoming data packets; decoding and analyzing the incoming data packets; analyzing the plurality of analog output signals and digitally encoded information signals using a triggering algorithm; and storing digitized analog output signals and digitally encoded information signals together with corresponding timing information in a record as fault and sequence of events records.

REFERENCES:
patent: 5535193 (1996-07-01), Zhang et al.
patent: 5808587 (1998-09-01), Shima
patent: 6385022 (2002-05-01), Kulidjian et al.
patent: 6469629 (2002-10-01), Campbell et al.
patent: 6795789 (2004-09-01), Vandiver
patent: 2002/0103772 (2002-08-01), Chattopadhyay
patent: 1 385 013 (2002-01-01), None

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