Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1998-08-20
2000-06-20
Sherry, Michael J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 78, 361 63, 361 932, H02H 318
Patent
active
06078489&
ABSTRACT:
A method of performing instantaneous protection in a trip unit is presented. The electronic trip unit includes a microcontroller and associated ROM having trip unit application code, e.g., main functionality firmware, including initializing parameters, and boot code, stored therein and EEPROM having operational parameter code stored therein. An instantaneous protection algorithm (program) stored in the memory of the trip unit has a `WAIT` state and a `RUN` state. In the RUN state samples of the sensed current that classify as points that are accumulated in a point register. Accumulation of a determined number of points qualifies as a peak. These peaks are accumulated in a peak register. If a point is not detected within a determined time period, then the count of peaks accumulated in the peak register is decremented, thereby provided a cooling function. When the count in the peak register exceeds the sensor limit a signal is generated by the microcontroller to initiate the trip.
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Koller Michael Roger
Marple James Arthur
Messerli Alan Joseph
General Electric Company
Horton Carl B.
Sherry Michael J.
Wasserbauer Damian G.
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