Computer-controlled system for protecting electric circuits

Details Computer-controlled system for protecting electric circuits Computer-controlled system for protecting electric circuits

1983-07-21

1985-07-16

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 93, H02H 726

Patent

active

045300240

ABSTRACT:
A computer-controlled system protects electric circuits where power and branch load circuits are all disposed outside the pressure hull of a submersible in a marine environment. The system generally comprises a combined inboard operator panel and computer arrangement and an inboard or outboard circuit breaker computer operatively connected by a data link to the panel computer. A multiplexer/demultiplexer arrangement is provided for the system to minimize the passage of electric lines through the hull. The circuit breaker computer compares its stored information with the output of circuit current sensors to detect whether a circuit fault condition exists and if so to open the interrupter of the fault-detected circuit. Moreover, if a circuit fault is detected greater than a predetermined value, e.g., greater than 500% normal load current value, the circuit breaker computer not only opens the fault detected branch circuit but also the power circuit. The circuit breaker computer is programmed that even if the data link is disconnected with the operator computer, the circuit breaker computer continues to monitor all circuits thereby enabling continued operation of the submersible without endangering the crew.

REFERENCES:
patent: 3873887 (1975-03-01), Barkan et al.
patent: 4321645 (1982-03-01), Thom et al.
patent: 4331999 (1982-05-01), Engel et al.
patent: 4346422 (1982-08-01), Inzoli
"Development of Deep-ocean Work System", Mechanism & Machine Theory, 1977, ol. 12, No. 5, pp. 569-576, Pergamon Press, Estabrook et al.

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