Microprocessor-controlled circuit breaker and system

Details Microprocessor-controlled circuit breaker and system Microprocessor-controlled circuit breaker and system

1988-03-31

1991-02-26

Teska, Kevin J.

Boots, shoes, and leggings

307132E, 340657, 361 71, 364492, G06F 1556, G01R 1900

Patent

active

049966464

ABSTRACT:
A circuit breaker system uses a microprocessor for calculating at least one function of a measured current flow. The microprocessor provides other functions such as serial data stream communications, the ability of many circuit breaker systems to communicate with a central computer, storage of trip information concerning the last trip, storage of historical trip information concerning a number of past trips, EEPROM memory for storing trip information, the microprocessor may inhibit tripping on a high current fault to permit storage of trip information into a memory, power is derived from current transformers drawing energy from current flow to a load and the electronics are protected from high voltage caused by heavy current flow to the load, optical isolators are used for the circuit breaker to communicate with external equipment, a multi-turn resistor adjusts an external test voltage for testing the circuit breaker system, in the event that there is no load or a load drawing insufficient current to provide power for the electronics the circuit breaker may be externally powered to provide readout of electrically erasable programmable read only memory, the microprocessor reads setting switches and a multiplier plug. Also the microprocessor is capable of digitizing selected quantities frequently and of digitizing other quantities less frequently. A second microprocessor permits one microprocessor to sampler voltage and current rapidly for metering purposes, and the second microprocessor operates other functions.

REFERENCES:
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patent: 4680706 (1987-07-01), Bray
patent: 4709339 (1987-11-01), Fernandes
patent: 4717985 (1988-01-01), Demeyer
patent: 4747061 (1988-05-01), Lagree et al.
patent: 4783748 (1988-11-01), Swarztrauber et al.
patent: 4794369 (1988-12-01), Haferd
patent: 4803635 (1989-02-01), Andow

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