Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-03-23
2000-11-14
Lieu, Julie
Communications: electrical
Condition responsive indicating system
Specific condition
340635, 340645, 340658, 340660, 340661, 361 59, 361 61, 361 71, 361 76, 361 77, 324107, 324108, G08B 2100
Patent
active
061476161
ABSTRACT:
The present invention provides a digital automatic power interruption and re-supply relay for performing detection and comparing operation to inform a state of an accident with voice and numerals and automatically operating a connected relay to interrupt power when there occur abnormal changes such as interruption of electric power, open-phase, anomalous voltage, unbalanced voltage, negative-phase, overcurrent, and electric leakage in a power transmit and supply line of high and low voltage or special high voltage and high (low) voltage and, after compensating for the accident, for automatically re-supplying the power. The automatic power interruption and re-supply relay for an electric power line comprises: an anomalous voltage detector coupled to three phase buses for detecting unbalanced voltage and anomalous voltage of three phases; a phase detector for detecting an open-phase, negative-phase, and interruption of electric power; an overcurrent detector for detecting overcurrent on each electric power line; a zero current detector for detecting zero current on each electric power line; a breakdown detector for detecting an anomalous state of relays installed on the electric power lines and machinery installed in an industrial site; and a central processing unit (CPU) implemented with a microprocessor for comparing and analyzing information from the detectors with preselected reference values and determining and processing the anomalous state.
REFERENCES:
patent: 4223365 (1980-09-01), Moran
patent: 4333119 (1982-06-01), Schoenmeyr
patent: 5946174 (1999-08-01), Kaiser
patent: 5959537 (1999-09-01), Banting et al.
Lieu Julie
White John P.
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