Discriminating circuit breaker protection system direct current

Details Discriminating circuit breaker protection system direct current Discriminating circuit breaker protection system direct current

1979-10-05

1981-10-20

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

340310R, 361113, H02H 317

Patent

active

042964504

ABSTRACT:
An improved discriminating circuit breaker system for use with an electrically grounded direct current power distribution system. A three-tier safeguard system is provided to insure proper operation of the breaker should a fault occur. The basic components include the electrically operated circuit breaker and a control circuit therefor. The control circuit sends a control signal to the breaker to operate it depending on whether a illegitimate load is detected on the power distribution system. This detection process utilizes: a pilot wire through which any control signal flows; an alternating current (a.c) signal generator to superimpose such a signal on the transmission line; a current detector to sense the a.c. level and produce a control signal if its current value exceeds a maximum level; a voltage detector to sense the voltage level of the a.c. signal and to produce a control signal if the value falls below a minimum level; and a switch system responsive to the control signals and in series with the pilot wire to activate the opening of the circuit breaker when the wire is open or when a control signal is produced.

REFERENCES:
patent: 2874337 (1959-02-01), Sorensen
patent: 2991397 (1961-07-01), Place
patent: 3072827 (1963-01-01), Benish
patent: 3581152 (1971-05-01), Hunt
patent: 3754221 (1973-08-01), Stelter
patent: 3946279 (1976-03-01), Paice et al.
patent: 3975663 (1976-08-01), Moorey

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