Solid-state circuit breaker with fault current conduction

Details Solid-state circuit breaker with fault current conduction Solid-state circuit breaker with fault current conduction

1994-11-04

1996-10-01

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 87, 361 63, H02H 300

Patent

active

055615791

ABSTRACT:
A solid-state circuit breaker with fault current conduction is described. The circuit includes a power sensor connected to a power line having an up-stream side and a down-stream side. The output of the power sensor is conveyed to a switch selection circuit that identifies a line disturbance on the power line. In response to a line disturbance, the switch selection circuit generates a set of output signals. The output signals force the opening of a fault current interruption circuit including a set of turn-off thyristors. The turn-off thyristors respond to the line disturbance within a fraction of a power signal cycle to provide isolation between the up-stream side and downstream side of the power line. An alternate power source may then be applied to the down-stream side of the power line. If the line disturbance exists on the down-stream side of the power line, the output signals force the closing of a fault current conduction circuit including a set of thyristors connected in series with a reactor. The closing of the fault current conduction circuit forces the conduction of a fault current from the reactor that allows the activation of circuit breakers positioned on the down-stream side of the power line. As a result, a conventional hierarchical circuit breaker control strategy is maintained.

REFERENCES:
patent: 3558983 (1971-01-01), Steen
patent: 4924342 (1990-05-01), Lee

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