Arc fault detector comparing integrated interval to interval fil

Details Arc fault detector comparing integrated interval to interval fil Arc fault detector comparing integrated interval to interval fil

1998-06-02

1999-08-03

Jackson, Stephen W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 93, 361 78, 361115, H02H 300

Patent

active

059333057

ABSTRACT:
Arc faults are detected by bandpass filtering the current to generate a sensed current signal with a pulse each time an arc is struck. A resettable integrator integrates this sensed current repetitively over equal time intervals such as each cycle of the ac current. The integrated value of the sensed current is compared with the value for the previous corresponding time interval stored in a sample and hold circuit, with the indications of interval to interval increases and decreases in the integrated sensed values for a selected number, such as six, of the most recent time intervals stored in a shift register. For each time interval, a chaos detector counts the number of changes between increases and decreases for the selected number of most recent corresponding time intervals and accumulates a weighted sum of the counts which is time attenuated. When the sum reaches a predetermined amount, an output such as a trip signal for a circuit breaker is generated.

REFERENCES:
patent: 5224006 (1993-06-01), MacKenzie et al.
patent: 5452223 (1995-09-01), Zuercher et al.
patent: 5682101 (1997-10-01), Brooks et al.
patent: 5691869 (1997-11-01), Engel et al.

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