Processor controlled circuit breaker trip system having reliable

Details Processor controlled circuit breaker trip system having reliable Processor controlled circuit breaker trip system having reliable

1989-08-31

1992-02-18

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 97, 340664, 364483, H02H 304

Patent

active

050899287

ABSTRACT:
A fault-powered, processor-based circuit breaker tripping system employs a reliable low power trip indicator circuit that is normally powered from the tripping system. A liquid crystal display is used to indicate the status of the system, and a battery is used as a secondary power source after a trip terminates the power to the system. The battery is enabled by a manual switch or by a latch which responds to one of a plurality of trip signals from the processor. The latch also provides signals to a driver circuit to drive the LCD. Once enabled, the battery provides power to the latch and the LCD so that the cause of the trip may be displayed during a power fault. The manual switch can be used to select status signals to be displayed on the LCD, and to indicate the condition of the battery. The LCD includes a segment for indicating that the system is energized and power is being drawn from the current path but that amount of power is below all fault levels and insufficient to operate the system.

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Schematic of Circuit Board Including a Ground Fault Test Transducer Sold by Square D.

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