Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1990-03-27
1992-12-15
Deboer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 91, 361 5, H02H 326
Patent
active
051722917
ABSTRACT:
A remotely controllable circuit breaker and switch for controlling the flow of current from a three phase AC power source to a three phase load, and usable in either wye or delta configurations. A latching relay controls the current for each phase. Current samples in the three phases are scaled and converted to DC values by scalers and RMS to DC converters. The DC values are converted to digital current values by an analog-to-digital converter which sequentially scans the DC values of the currents in the three phases. A central processing unit monitors the digital current values to detect significant phase imbalances and overcurrents which persist for time periods which exceed allowable limits according to a predetermined time-dependent function, and to initiate opening of the relays in response thereto. The central processing unit also opens and/or resets the relays in response to remote control signals. The relays are opened in a zero-crossover mode when the currents exceed predefined threshold values; and in order to minimize the effects of noise are opened without regard to zero crossover when the currents are below said threshold values. Relay status contacts are employed to reduce power consumption during relay operation by terminating relay coil drive pulses when the relay contacts have achieved the desired state.
REFERENCES:
patent: 4368500 (1983-01-01), Conroy, Jr.
patent: 4379317 (1987-04-01), Conroy, Jr.
patent: 4414601 (1983-11-01), Conroy, Jr.
Bakely Laurence C.
Horowitz Martin C.
Martelli, Jr John J.
Deboer Todd E.
Lessler Arthur L.
Struthers-Dunn, Inc.
LandOfFree
Intelligent power controller does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Intelligent power controller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intelligent power controller will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2098606